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Replace qetsingleapplication by singleApplication.

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See : https://github.com/itay-grudev/SingleApplication


git-svn-id: svn+ssh://svn.tuxfamily.org/svnroot/qet/qet/trunk@5481 bfdf4180-ca20-0410-9c96-a3a8aa849046
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blacksun
2018-08-15 12:45:55 +00:00
parent d2a6c23360
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180
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Changelog
=========
__3.0.12a__
----------
* Removed signal handling.
__3.0.11a__
----------
* Fixed bug where the message sent by the second process was not received
correctly when the message is sent immediately following a connection.
_Francis Giraldeau_
* Refactored code and implemented shared memory block consistency checks
via `qChecksum()` (CRC-16).
* Explicit `qWarning` and `qCritical` when the library is unable to initialise
correctly.
__3.0.10__
----------
* Removed C style casts and eliminated all clang warnings. Fixed `instanceId`
reading from only one byte in the message deserialization. Cleaned up
serialization code using `QDataStream`. Changed connection type to use
`quint8 enum` rather than `char`.
* Renamed `SingleAppConnectionType` to `ConnectionType`. Added initialization
values to all `ConnectionType` enum cases.
_Jedidiah Buck McCready_
__3.0.9__
---------
* Added SingleApplicationPrivate::primaryPid() as a solution to allow
bringing the primary window of an application to the foreground on
Windows.
_Eelco van Dam from Peacs BV_
__3.0.8__
---------
* Bug fix - changed QApplication::instance() to QCoreApplication::instance()
_Evgeniy Bazhenov_
__3.0.7a__
----------
* Fixed compilation error with Mingw32 in MXE thanks to Vitaly Tonkacheyev.
* Removed QMutex used for thread safe behaviour. The implementation now uses
QCoreApplication::instance() to get an instance to SingleApplication for
memory deallocation.
__3.0.6a__
----------
* Reverted GetUserName API usage on Windows. Fixed bug with missing library.
* Fixed bug in the Calculator example, preventing it's window to be raised
on Windows.
Special thanks to Charles Gunawan.
__3.0.5a__
----------
* Fixed a memory leak in the SingleApplicationPrivate destructor.
_Sergei Moiseev_
__3.0.4a__
----------
* Fixed shadow and uninitialised variable warnings.
_Paul Walmsley_
__3.0.3a__
----------
* Removed Microsoft Windows specific code for getting username due to
multiple problems and compiler differences on Windows platforms. On
Windows the shared memory block in User mode now includes the user's
home path (which contains the user's username).
* Explicitly getting absolute path of the user's home directory as on Unix
a relative path (`~`) may be returned.
__3.0.2a__
----------
* Fixed bug on Windows when username containing wide characters causes the
library to crash.
_Le Liu_
__3.0.1a__
----------
* Allows the application path and version to be excluded from the server name
hash. The following flags were added for this purpose:
* `SingleApplication::Mode::ExcludeAppVersion`
* `SingleApplication::Mode::ExcludeAppPath`
* Allow a non elevated process to connect to a local server created by an
elevated process run by the same user on Windows
* Fixes a problem with upper case letters in paths on Windows
_Le Liu_
__v3.0a__
---------
* Depricated secondary instances count.
* Added a sendMessage() method to send a message to the primary instance.
* Added a receivedMessage() signal, emitted when a message is received from a
secondary instance.
* The SingleApplication constructor's third parameter is now a bool
specifying if the current instance should be allowed to run as a secondary
instance if there is already a primary instance.
* The SingleApplication constructor accept a fourth parameter specifying if
the SingleApplication block should be User-wide or System-wide.
* SingleApplication no longer relies on `applicationName` and
`organizationName` to be set. It instead concatenates all of the following
data and computes a `SHA256` hash which is used as the key of the
`QSharedMemory` block and the `QLocalServer`. Since at least
`applicationFilePath` is always present there is no need to explicitly set
any of the following prior to initialising `SingleApplication`.
* `QCoreApplication::applicationName`
* `QCoreApplication::applicationVersion`
* `QCoreApplication::applicationFilePath`
* `QCoreApplication::organizationName`
* `QCoreApplication::organizationDomain`
* User name or home directory path if in User mode
* The primary instance is no longer notified when a secondary instance had
been started by default. A `Mode` flag for this feature exists.
* Added `instanceNumber()` which represents a unique identifier for each
secondary instance started. When called from the primary instance will
return `0`.
__v2.4__
--------
* Stability improvements
* Support for secondary instances.
* The library now recovers safely after the primary process has crashed
and the shared memory had not been deleted.
__v2.3__
--------
* Improved pimpl design and inheritance safety.
_Vladislav Pyatnichenko_
__v2.2__
--------
* The `QAPPLICATION_CLASS` macro can now be defined in the file including the
Single Application header or with a `DEFINES+=` statement in the project file.
__v2.1__
--------
* A race condition can no longer occur when starting two processes nearly
simultaneously.
Fix issue [#3](https://github.com/itay-grudev/SingleApplication/issues/3)
__v2.0__
--------
* SingleApplication is now being passed a reference to `argc` instead of a
copy.
Fix issue [#1](https://github.com/itay-grudev/SingleApplication/issues/1)
* Improved documentation.

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The MIT License (MIT)
Copyright (c) Itay Grudev 2015 - 2016
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
Note: Some of the examples include code not distributed under the terms of the
MIT License.

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SingleApplication
=================
This is a replacement of the QtSingleApplication for `Qt5`.
Keeps the Primary Instance of your Application and kills each subsequent
instances. It can (if enabled) spawn secondary (non-related to the primary)
instances and can send data to the primary instance from secondary instances.
Usage
-----
The `SingleApplication` class inherits from whatever `Q[Core|Gui]Application`
class you specify via the `QAPPLICATION_CLASS` macro (`QCoreApplication` is the
default). Further usage is similar to the use of the `Q[Core|Gui]Application`
classes.
The library sets up a `QLocalServer` and a `QSharedMemory` block. The first
instance of your Application is your Primary Instance. It would check if the
shared memory block exists and if not it will start a `QLocalServer` and listen
for connections. Each subsequent instance of your application would check if the
shared memory block exists and if it does, it will connect to the QLocalServer
to notify the primary instance that a new instance had been started, after which
it would terminate with status code `0`. In the Primary Instance
`SingleApplication` would emit the `instanceStarted()` signal upon detecting
that a new instance had been started.
The library uses `stdlib` to terminate the program with the `exit()` function.
You can use the library as if you use any other `QCoreApplication` derived
class:
```cpp
#include <QApplication>
#include <SingleApplication.h>
int main( int argc, char* argv[] )
{
SingleApplication app( argc, argv );
return app.exec();
}
```
To include the library files I would recommend that you add it as a git
submodule to your project and include it's contents with a `.pri` file. Here is
how:
```bash
git submodule add git@github.com:itay-grudev/SingleApplication.git singleapplication
```
Then include the `singleapplication.pri` file in your `.pro` project file. Also
don't forget to specify which `QCoreApplication` class your app is using if it
is not `QCoreApplication`.
```qmake
include(singleapplication/singleapplication.pri)
DEFINES += QAPPLICATION_CLASS=QApplication
```
The `Instance Started` signal
------------------------
The SingleApplication class implements a `instanceStarted()` signal. You can
bind to that signal to raise your application's window when a new instance had
been started, for example.
```cpp
// window is a QWindow instance
QObject::connect(
&app,
&SingleApplication::instanceStarted,
&window,
&QWindow::raise
);
```
Using `SingleApplication::instance()` is a neat way to get the
`SingleApplication` instance for binding to it's signals anywhere in your
program.
__Note:__ On Windows the ability to bring the application windows to the
foreground is restricted. See [Windows specific implementations](Windows.md)
for a workaround and an example implementation.
Secondary Instances
-------------------
If you want to be able to launch additional Secondary Instances (not related to
your Primary Instance) you have to enable that with the third parameter of the
`SingleApplication` constructor. The default is `false` meaning no Secondary
Instances. Here is an example of how you would start a Secondary Instance send
a message with the command line arguments to the primary instance and then shut
down.
```cpp
int main(int argc, char *argv[])
{
SingleApplication app( argc, argv, true );
if( app.isSecondary() ) {
app.sendMessage( app.arguments().join(' ')).toUtf8() );
app.exit( 0 );
}
return app.exec();
}
```
*__Note:__ A secondary instance won't cause the emission of the
`instanceStarted()` signal by default. See `SingleApplication::Mode` for more
details.*
You can check whether your instance is a primary or secondary with the following
methods:
```cpp
app.isPrimary();
// or
app.isSecondary();
```
*__Note:__ If your Primary Instance is terminated a newly launched instance
will replace the Primary one even if the Secondary flag has been set.*
API
---
### Members
```cpp
SingleApplication::SingleApplication( int &argc, char *argv[], bool allowSecondary = false, Options options = Mode::User, int timeout = 100 )
```
Depending on whether `allowSecondary` is set, this constructor may terminate
your app if there is already a primary instance running. Additional `Options`
can be specified to set whether the SingleApplication block should work
user-wide or system-wide. Additionally the `Mode::SecondaryNotification` may be
used to notify the primary instance whenever a secondary instance had been
started (disabled by default). `timeout` specifies the maximum time in
milliseconds to wait for blocking operations.
*__Note:__ `argc` and `argv` may be changed as Qt removes arguments that it
recognizes.*
*__Note:__ `Mode::SecondaryNotification` only works if set on both the primary
and the secondary instance.*
*__Note:__ Operating system can restrict the shared memory blocks to the same
user, in which case the User/System modes will have no effect and the block will
be user wide.*
---
```cpp
bool SingleApplication::sendMessage( QByteArray message, int timeout = 100 )
```
Sends `message` to the Primary Instance. Uses `timeout` as a the maximum timeout
in milliseconds for blocking functions
---
```cpp
bool SingleApplication::isPrimary()
```
Returns if the instance is the primary instance.
---
```cpp
bool SingleApplication::isSecondary()
```
Returns if the instance is a secondary instance.
---
```cpp
quint32 SingleApplication::instanceId()
```
Returns a unique identifier for the current instance.
---
```cpp
qint64 SingleApplication::primaryPid()
```
Returns the process ID (PID) of the primary instance.
### Signals
```cpp
void SingleApplication::instanceStarted()
```
Triggered whenever a new instance had been started, except for secondary
instances if the `Mode::SecondaryNotification` flag is not specified.
---
```cpp
void SingleApplication::receivedMessage( quint32 instanceId, QByteArray message )
```
Triggered whenever there is a message received from a secondary instance.
---
### Flags
```cpp
enum SingleApplication::Mode
```
* `Mode::User` - The SingleApplication block should apply user wide. This adds
user specific data to the key used for the shared memory and server name.
This is the default functionality.
* `Mode::System` – The SingleApplication block applies system-wide.
* `Mode::SecondaryNotification` – Whether to trigger `instanceStarted()` even
whenever secondary instances are started.
* `Mode::ExcludeAppPath` – Excludes the application path from the server name
(and memory block) hash.
* `Mode::ExcludeAppVersion` – Excludes the application version from the server
name (and memory block) hash.
*__Note:__ `Mode::SecondaryNotification` only works if set on both the primary
and the secondary instance.*
*__Note:__ Operating system can restrict the shared memory blocks to the same
user, in which case the User/System modes will have no effect and the block will
be user wide.*
---
Versioning
----------
Each major version introduces either very significant changes or is not
backwards compatible with the previous version. Minor versions only add
additional features, bug fixes or performance improvements and are backwards
compatible with the previous release. See [`CHANGELOG.md`](CHANGELOG.md) for
more details.
Implementation
--------------
The library is implemented with a QSharedMemory block which is thread safe and
guarantees a race condition will not occur. It also uses a QLocalSocket to
notify the main process that a new instance had been spawned and thus invoke the
`instanceStarted()` signal and for messaging the primary instance.
Additionally the library can recover from being forcefully killed on *nix
systems and will reset the memory block given that there are no other
instances running.
License
-------
This library and it's supporting documentation are released under
`The MIT License (MIT)` with the exception of the Qt calculator examples which
is distributed under the BSD license.

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Windows Specific Implementations
================================
Setting the foreground window
-----------------------------
In the `instanceStarted()` example in the `README` we demonstrated how an
application can bring it's primary instance window whenever a second copy
of the application is started.
On Windows the ability to bring the application windows to the foreground is
restricted, see [`AllowSetForegroundWindow()`][AllowSetForegroundWindow] for more
details.
The background process (the primary instance) can bring its windows to the
foreground if it is allowed by the current foreground process (the secondary
instance). To bypass this `SingleApplication` must be initialized with the
`allowSecondary` parameter set to `true` and the `options` parameter must
include `Mode::SecondaryNotification`, See `SingleApplication::Mode` for more
details.
Here is an example:
```cpp
if( app.isSecondary() ) {
// This API requires LIBS += User32.lib to be added to the project
AllowSetForegroundWindow( DWORD( app.getPrimaryPid() ) );
}
if( app.isPrimary() ) {
QObject::connect(
&app,
&SingleApplication::instanceStarted,
this,
&App::instanceStarted
);
}
```
```cpp
void App::instanceStarted() {
QApplication::setActiveWindow( [window/widget to set to the foreground] );
}
```
[AllowSetForegroundWindow]: https://msdn.microsoft.com/en-us/library/windows/desktop/ms632668.aspx

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# Single Application implementation
include(../../singleapplication.pri)
DEFINES += QAPPLICATION_CLASS=QCoreApplication
SOURCES += main.cpp

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#include <singleapplication.h>
int main(int argc, char *argv[])
{
// Allow secondary instances
SingleApplication app( argc, argv );
return app.exec();
}

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtWidgets>
#include "button.h"
//! [0]
Button::Button(const QString &text, QWidget *parent)
: QToolButton(parent)
{
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
setText(text);
}
//! [0]
//! [1]
QSize Button::sizeHint() const
//! [1] //! [2]
{
QSize size = QToolButton::sizeHint();
size.rheight() += 20;
size.rwidth() = qMax(size.width(), size.height());
return size;
}
//! [2]

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef BUTTON_H
#define BUTTON_H
#include <QToolButton>
//! [0]
class Button : public QToolButton
{
Q_OBJECT
public:
explicit Button(const QString &text, QWidget *parent = 0);
QSize sizeHint() const Q_DECL_OVERRIDE;
};
//! [0]
#endif

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtWidgets>
#include <cmath>
#include "button.h"
#include "calculator.h"
//! [0]
Calculator::Calculator(QWidget *parent)
: QWidget(parent)
{
sumInMemory = 0.0;
sumSoFar = 0.0;
factorSoFar = 0.0;
waitingForOperand = true;
//! [0]
//! [1]
display = new QLineEdit("0");
//! [1] //! [2]
display->setReadOnly(true);
display->setAlignment(Qt::AlignRight);
display->setMaxLength(15);
QFont font = display->font();
font.setPointSize(font.pointSize() + 8);
display->setFont(font);
//! [2]
//! [4]
for (int i = 0; i < NumDigitButtons; ++i) {
digitButtons[i] = createButton(QString::number(i), SLOT(digitClicked()));
}
Button *pointButton = createButton(tr("."), SLOT(pointClicked()));
Button *changeSignButton = createButton(tr("\302\261"), SLOT(changeSignClicked()));
Button *backspaceButton = createButton(tr("Backspace"), SLOT(backspaceClicked()));
Button *clearButton = createButton(tr("Clear"), SLOT(clear()));
Button *clearAllButton = createButton(tr("Clear All"), SLOT(clearAll()));
Button *clearMemoryButton = createButton(tr("MC"), SLOT(clearMemory()));
Button *readMemoryButton = createButton(tr("MR"), SLOT(readMemory()));
Button *setMemoryButton = createButton(tr("MS"), SLOT(setMemory()));
Button *addToMemoryButton = createButton(tr("M+"), SLOT(addToMemory()));
Button *divisionButton = createButton(tr("\303\267"), SLOT(multiplicativeOperatorClicked()));
Button *timesButton = createButton(tr("\303\227"), SLOT(multiplicativeOperatorClicked()));
Button *minusButton = createButton(tr("-"), SLOT(additiveOperatorClicked()));
Button *plusButton = createButton(tr("+"), SLOT(additiveOperatorClicked()));
Button *squareRootButton = createButton(tr("Sqrt"), SLOT(unaryOperatorClicked()));
Button *powerButton = createButton(tr("x\302\262"), SLOT(unaryOperatorClicked()));
Button *reciprocalButton = createButton(tr("1/x"), SLOT(unaryOperatorClicked()));
Button *equalButton = createButton(tr("="), SLOT(equalClicked()));
//! [4]
//! [5]
QGridLayout *mainLayout = new QGridLayout;
//! [5] //! [6]
mainLayout->setSizeConstraint(QLayout::SetFixedSize);
mainLayout->addWidget(display, 0, 0, 1, 6);
mainLayout->addWidget(backspaceButton, 1, 0, 1, 2);
mainLayout->addWidget(clearButton, 1, 2, 1, 2);
mainLayout->addWidget(clearAllButton, 1, 4, 1, 2);
mainLayout->addWidget(clearMemoryButton, 2, 0);
mainLayout->addWidget(readMemoryButton, 3, 0);
mainLayout->addWidget(setMemoryButton, 4, 0);
mainLayout->addWidget(addToMemoryButton, 5, 0);
for (int i = 1; i < NumDigitButtons; ++i) {
int row = ((9 - i) / 3) + 2;
int column = ((i - 1) % 3) + 1;
mainLayout->addWidget(digitButtons[i], row, column);
}
mainLayout->addWidget(digitButtons[0], 5, 1);
mainLayout->addWidget(pointButton, 5, 2);
mainLayout->addWidget(changeSignButton, 5, 3);
mainLayout->addWidget(divisionButton, 2, 4);
mainLayout->addWidget(timesButton, 3, 4);
mainLayout->addWidget(minusButton, 4, 4);
mainLayout->addWidget(plusButton, 5, 4);
mainLayout->addWidget(squareRootButton, 2, 5);
mainLayout->addWidget(powerButton, 3, 5);
mainLayout->addWidget(reciprocalButton, 4, 5);
mainLayout->addWidget(equalButton, 5, 5);
setLayout(mainLayout);
setWindowTitle(tr("Calculator"));
}
//! [6]
//! [7]
void Calculator::digitClicked()
{
Button *clickedButton = qobject_cast<Button *>(sender());
int digitValue = clickedButton->text().toInt();
if (display->text() == "0" && digitValue == 0.0)
return;
if (waitingForOperand) {
display->clear();
waitingForOperand = false;
}
display->setText(display->text() + QString::number(digitValue));
}
//! [7]
//! [8]
void Calculator::unaryOperatorClicked()
//! [8] //! [9]
{
Button *clickedButton = qobject_cast<Button *>(sender());
QString clickedOperator = clickedButton->text();
double operand = display->text().toDouble();
double result = 0.0;
if (clickedOperator == tr("Sqrt")) {
if (operand < 0.0) {
abortOperation();
return;
}
result = std::sqrt(operand);
} else if (clickedOperator == tr("x\302\262")) {
result = std::pow(operand, 2.0);
} else if (clickedOperator == tr("1/x")) {
if (operand == 0.0) {
abortOperation();
return;
}
result = 1.0 / operand;
}
display->setText(QString::number(result));
waitingForOperand = true;
}
//! [9]
//! [10]
void Calculator::additiveOperatorClicked()
//! [10] //! [11]
{
Button *clickedButton = qobject_cast<Button *>(sender());
QString clickedOperator = clickedButton->text();
double operand = display->text().toDouble();
//! [11] //! [12]
if (!pendingMultiplicativeOperator.isEmpty()) {
//! [12] //! [13]
if (!calculate(operand, pendingMultiplicativeOperator)) {
abortOperation();
return;
}
display->setText(QString::number(factorSoFar));
operand = factorSoFar;
factorSoFar = 0.0;
pendingMultiplicativeOperator.clear();
}
//! [13] //! [14]
if (!pendingAdditiveOperator.isEmpty()) {
//! [14] //! [15]
if (!calculate(operand, pendingAdditiveOperator)) {
abortOperation();
return;
}
display->setText(QString::number(sumSoFar));
} else {
sumSoFar = operand;
}
//! [15] //! [16]
pendingAdditiveOperator = clickedOperator;
//! [16] //! [17]
waitingForOperand = true;
}
//! [17]
//! [18]
void Calculator::multiplicativeOperatorClicked()
{
Button *clickedButton = qobject_cast<Button *>(sender());
QString clickedOperator = clickedButton->text();
double operand = display->text().toDouble();
if (!pendingMultiplicativeOperator.isEmpty()) {
if (!calculate(operand, pendingMultiplicativeOperator)) {
abortOperation();
return;
}
display->setText(QString::number(factorSoFar));
} else {
factorSoFar = operand;
}
pendingMultiplicativeOperator = clickedOperator;
waitingForOperand = true;
}
//! [18]
//! [20]
void Calculator::equalClicked()
{
double operand = display->text().toDouble();
if (!pendingMultiplicativeOperator.isEmpty()) {
if (!calculate(operand, pendingMultiplicativeOperator)) {
abortOperation();
return;
}
operand = factorSoFar;
factorSoFar = 0.0;
pendingMultiplicativeOperator.clear();
}
if (!pendingAdditiveOperator.isEmpty()) {
if (!calculate(operand, pendingAdditiveOperator)) {
abortOperation();
return;
}
pendingAdditiveOperator.clear();
} else {
sumSoFar = operand;
}
display->setText(QString::number(sumSoFar));
sumSoFar = 0.0;
waitingForOperand = true;
}
//! [20]
//! [22]
void Calculator::pointClicked()
{
if (waitingForOperand)
display->setText("0");
if (!display->text().contains('.'))
display->setText(display->text() + tr("."));
waitingForOperand = false;
}
//! [22]
//! [24]
void Calculator::changeSignClicked()
{
QString text = display->text();
double value = text.toDouble();
if (value > 0.0) {
text.prepend(tr("-"));
} else if (value < 0.0) {
text.remove(0, 1);
}
display->setText(text);
}
//! [24]
//! [26]
void Calculator::backspaceClicked()
{
if (waitingForOperand)
return;
QString text = display->text();
text.chop(1);
if (text.isEmpty()) {
text = "0";
waitingForOperand = true;
}
display->setText(text);
}
//! [26]
//! [28]
void Calculator::clear()
{
if (waitingForOperand)
return;
display->setText("0");
waitingForOperand = true;
}
//! [28]
//! [30]
void Calculator::clearAll()
{
sumSoFar = 0.0;
factorSoFar = 0.0;
pendingAdditiveOperator.clear();
pendingMultiplicativeOperator.clear();
display->setText("0");
waitingForOperand = true;
}
//! [30]
//! [32]
void Calculator::clearMemory()
{
sumInMemory = 0.0;
}
void Calculator::readMemory()
{
display->setText(QString::number(sumInMemory));
waitingForOperand = true;
}
void Calculator::setMemory()
{
equalClicked();
sumInMemory = display->text().toDouble();
}
void Calculator::addToMemory()
{
equalClicked();
sumInMemory += display->text().toDouble();
}
//! [32]
//! [34]
Button *Calculator::createButton(const QString &text, const char *member)
{
Button *button = new Button(text);
connect(button, SIGNAL(clicked()), this, member);
return button;
}
//! [34]
//! [36]
void Calculator::abortOperation()
{
clearAll();
display->setText(tr("####"));
}
//! [36]
//! [38]
bool Calculator::calculate(double rightOperand, const QString &pendingOperator)
{
if (pendingOperator == tr("+")) {
sumSoFar += rightOperand;
} else if (pendingOperator == tr("-")) {
sumSoFar -= rightOperand;
} else if (pendingOperator == tr("\303\227")) {
factorSoFar *= rightOperand;
} else if (pendingOperator == tr("\303\267")) {
if (rightOperand == 0.0)
return false;
factorSoFar /= rightOperand;
}
return true;
}
//! [38]

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef CALCULATOR_H
#define CALCULATOR_H
#include <QWidget>
QT_BEGIN_NAMESPACE
class QLineEdit;
QT_END_NAMESPACE
class Button;
//! [0]
class Calculator : public QWidget
{
Q_OBJECT
public:
Calculator(QWidget *parent = 0);
private slots:
void digitClicked();
void unaryOperatorClicked();
void additiveOperatorClicked();
void multiplicativeOperatorClicked();
void equalClicked();
void pointClicked();
void changeSignClicked();
void backspaceClicked();
void clear();
void clearAll();
void clearMemory();
void readMemory();
void setMemory();
void addToMemory();
//! [0]
//! [1]
private:
//! [1] //! [2]
Button *createButton(const QString &text, const char *member);
void abortOperation();
bool calculate(double rightOperand, const QString &pendingOperator);
//! [2]
//! [3]
double sumInMemory;
//! [3] //! [4]
double sumSoFar;
//! [4] //! [5]
double factorSoFar;
//! [5] //! [6]
QString pendingAdditiveOperator;
//! [6] //! [7]
QString pendingMultiplicativeOperator;
//! [7] //! [8]
bool waitingForOperand;
//! [8]
//! [9]
QLineEdit *display;
//! [9] //! [10]
enum { NumDigitButtons = 10 };
Button *digitButtons[NumDigitButtons];
};
//! [10]
#endif

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QT += widgets
HEADERS = button.h \
calculator.h
SOURCES = button.cpp \
calculator.cpp \
main.cpp
# Single Application implementation
include(../../singleapplication.pri)
DEFINES += QAPPLICATION_CLASS=QApplication

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QApplication>
#include <singleapplication.h>
#include "calculator.h"
int main(int argc, char *argv[])
{
SingleApplication app(argc, argv);
Calculator calc;
QObject::connect( &app, &SingleApplication::instanceStarted, [ &calc ]() {
calc.raise();
calc.activateWindow();
});
calc.show();
return app.exec();
}

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#include <singleapplication.h>
#include "messagereceiver.h"
int main(int argc, char *argv[])
{
// Allow secondary instances
SingleApplication app( argc, argv, true );
MessageReceiver msgReceiver;
// If this is a secondary instance
if( app.isSecondary() ) {
app.sendMessage( app.arguments().join(' ').toUtf8() );
return 0;
} else {
QObject::connect(
&app,
&SingleApplication::receivedMessage,
&msgReceiver,
&MessageReceiver::receivedMessage
);
}
return app.exec();
}

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#include <QDebug>
#include "messagereceiver.h"
MessageReceiver::MessageReceiver(QObject *parent) : QObject(parent)
{
}
void MessageReceiver::receivedMessage(int instanceId, QByteArray message)
{
qDebug() << "Received message from instance: " << instanceId;
qDebug() << "Message Text: " << message;
}

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#ifndef MESSAGERECEIVER_H
#define MESSAGERECEIVER_H
#include <QObject>
class MessageReceiver : public QObject
{
Q_OBJECT
public:
explicit MessageReceiver(QObject *parent = 0);
public slots:
void receivedMessage( int instanceId, QByteArray message );
};
#endif // MESSAGERECEIVER_H

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# Single Application implementation
include(../../singleapplication.pri)
DEFINES += QAPPLICATION_CLASS=QCoreApplication
SOURCES += main.cpp \
messagereceiver.cpp
HEADERS += \
messagereceiver.h

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// The MIT License (MIT)
//
// Copyright (c) Itay Grudev 2015 - 2018
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include <QtCore/QTime>
#include <QtCore/QThread>
#include <QtCore/QDateTime>
#include <QtCore/QByteArray>
#include <QtCore/QSharedMemory>
#include "singleapplication.h"
#include "singleapplication_p.h"
/**
* @brief Constructor. Checks and fires up LocalServer or closes the program
* if another instance already exists
* @param argc
* @param argv
* @param {bool} allowSecondaryInstances
*/
SingleApplication::SingleApplication( int &argc, char *argv[], bool allowSecondary, Options options, int timeout )
: app_t( argc, argv ), d_ptr( new SingleApplicationPrivate( this ) )
{
Q_D(SingleApplication);
// Store the current mode of the program
d->options = options;
// Generating an application ID used for identifying the shared memory
// block and QLocalServer
d->genBlockServerName();
#ifdef Q_OS_UNIX
// By explicitly attaching it and then deleting it we make sure that the
// memory is deleted even after the process has crashed on Unix.
d->memory = new QSharedMemory( d->blockServerName );
d->memory->attach();
delete d->memory;
#endif
// Guarantee thread safe behaviour with a shared memory block.
d->memory = new QSharedMemory( d->blockServerName );
// Create a shared memory block
if( d->memory->create( sizeof( InstancesInfo ) ) ) {
// Initialize the shared memory block
d->memory->lock();
d->initializeMemoryBlock();
d->memory->unlock();
} else {
// Attempt to attach to the memory segment
if( ! d->memory->attach() ) {
qCritical() << "SingleApplication: Unable to attach to shared memory block.";
qCritical() << d->memory->errorString();
delete d;
::exit( EXIT_FAILURE );
}
}
InstancesInfo* inst = static_cast<InstancesInfo*>( d->memory->data() );
QTime time;
time.start();
// Make sure the shared memory block is initialised and in consistent state
while( true ) {
d->memory->lock();
if( d->blockChecksum() == inst->checksum ) break;
if( time.elapsed() > 5000 ) {
qWarning() << "SingleApplication: Shared memory block has been in an inconsistent state from more than 5s. Assuming primary instance failure.";
d->initializeMemoryBlock();
}
d->memory->unlock();
// Random sleep here limits the probability of a colision between two racing apps
qsrand( QDateTime::currentMSecsSinceEpoch() % std::numeric_limits<uint>::max() );
QThread::sleep( 8 + static_cast <unsigned long>( static_cast <float>( qrand() ) / RAND_MAX * 10 ) );
}
if( inst->primary == false) {
d->startPrimary();
d->memory->unlock();
return;
}
// Check if another instance can be started
if( allowSecondary ) {
inst->secondary += 1;
inst->checksum = d->blockChecksum();
d->instanceNumber = inst->secondary;
d->startSecondary();
if( d->options & Mode::SecondaryNotification ) {
d->connectToPrimary( timeout, SingleApplicationPrivate::SecondaryInstance );
}
d->memory->unlock();
return;
}
d->memory->unlock();
d->connectToPrimary( timeout, SingleApplicationPrivate::NewInstance );
delete d;
::exit( EXIT_SUCCESS );
}
/**
* @brief Destructor
*/
SingleApplication::~SingleApplication()
{
Q_D(SingleApplication);
delete d;
}
bool SingleApplication::isPrimary()
{
Q_D(SingleApplication);
return d->server != nullptr;
}
bool SingleApplication::isSecondary()
{
Q_D(SingleApplication);
return d->server == nullptr;
}
quint32 SingleApplication::instanceId()
{
Q_D(SingleApplication);
return d->instanceNumber;
}
qint64 SingleApplication::primaryPid()
{
Q_D(SingleApplication);
return d->primaryPid();
}
bool SingleApplication::sendMessage( QByteArray message, int timeout )
{
Q_D(SingleApplication);
// Nobody to connect to
if( isPrimary() ) return false;
// Make sure the socket is connected
d->connectToPrimary( timeout, SingleApplicationPrivate::Reconnect );
d->socket->write( message );
bool dataWritten = d->socket->flush();
d->socket->waitForBytesWritten( timeout );
return dataWritten;
}

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// The MIT License (MIT)
//
// Copyright (c) Itay Grudev 2015 - 2018
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#ifndef SINGLE_APPLICATION_H
#define SINGLE_APPLICATION_H
#include <QtCore/QtGlobal>
#include <QtNetwork/QLocalSocket>
#ifndef QAPPLICATION_CLASS
#define QAPPLICATION_CLASS QCoreApplication
#endif
#include QT_STRINGIFY(QAPPLICATION_CLASS)
class SingleApplicationPrivate;
/**
* @brief The SingleApplication class handles multipe instances of the same
* Application
* @see QCoreApplication
*/
class SingleApplication : public QAPPLICATION_CLASS
{
Q_OBJECT
typedef QAPPLICATION_CLASS app_t;
public:
/**
* @brief Mode of operation of SingleApplication.
* Whether the block should be user-wide or system-wide and whether the
* primary instance should be notified when a secondary instance had been
* started.
* @note Operating system can restrict the shared memory blocks to the same
* user, in which case the User/System modes will have no effect and the
* block will be user wide.
* @enum
*/
enum Mode {
User = 1 << 0,
System = 1 << 1,
SecondaryNotification = 1 << 2,
ExcludeAppVersion = 1 << 3,
ExcludeAppPath = 1 << 4
};
Q_DECLARE_FLAGS(Options, Mode)
/**
* @brief Intitializes a SingleApplication instance with argc command line
* arguments in argv
* @arg {int &} argc - Number of arguments in argv
* @arg {const char *[]} argv - Supplied command line arguments
* @arg {bool} allowSecondary - Whether to start the instance as secondary
* if there is already a primary instance.
* @arg {Mode} mode - Whether for the SingleApplication block to be applied
* User wide or System wide.
* @arg {int} timeout - Timeout to wait in miliseconds.
* @note argc and argv may be changed as Qt removes arguments that it
* recognizes
* @note Mode::SecondaryNotification only works if set on both the primary
* instance and the secondary instance.
* @note The timeout is just a hint for the maximum time of blocking
* operations. It does not guarantee that the SingleApplication
* initialisation will be completed in given time, though is a good hint.
* Usually 4*timeout would be the worst case (fail) scenario.
* @see See the corresponding QAPPLICATION_CLASS constructor for reference
*/
explicit SingleApplication( int &argc, char *argv[], bool allowSecondary = false, Options options = Mode::User, int timeout = 1000 );
~SingleApplication();
/**
* @brief Returns if the instance is the primary instance
* @returns {bool}
*/
bool isPrimary();
/**
* @brief Returns if the instance is a secondary instance
* @returns {bool}
*/
bool isSecondary();
/**
* @brief Returns a unique identifier for the current instance
* @returns {qint32}
*/
quint32 instanceId();
/**
* @brief Returns the process ID (PID) of the primary instance
* @returns {qint64}
*/
qint64 primaryPid();
/**
* @brief Sends a message to the primary instance. Returns true on success.
* @param {int} timeout - Timeout for connecting
* @returns {bool}
* @note sendMessage() will return false if invoked from the primary
* instance.
*/
bool sendMessage( QByteArray message, int timeout = 100 );
Q_SIGNALS:
void instanceStarted();
void receivedMessage( quint32 instanceId, QByteArray message );
private:
SingleApplicationPrivate *d_ptr;
Q_DECLARE_PRIVATE(SingleApplication)
};
Q_DECLARE_OPERATORS_FOR_FLAGS(SingleApplication::Options)
#endif // SINGLE_APPLICATION_H

19
SingleApplication/singleapplication.pri Normal file
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QT += core network
CONFIG += c++11
HEADERS += $$PWD/singleapplication.h \
$$PWD/singleapplication_p.h
SOURCES += $$PWD/singleapplication.cpp \
$$PWD/singleapplication_p.cpp
INCLUDEPATH += $$PWD
win32 {
msvc:LIBS += Advapi32.lib
gcc:LIBS += -ladvapi32
}
DISTFILES += \
$$PWD/README.md \
$$PWD/CHANGELOG.md \
$$PWD/Windows.md

349
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// The MIT License (MIT)
//
// Copyright (c) Itay Grudev 2015 - 2018
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
// W A R N I N G !!!
// -----------------
//
// This file is not part of the SingleApplication API. It is used purely as an
// implementation detail. This header file may change from version to
// version without notice, or may even be removed.
//
#include <cstdlib>
#include <cstddef>
#include <QtCore/QDir>
#include <QtCore/QProcess>
#include <QtCore/QByteArray>
#include <QtCore/QSemaphore>
#include <QtCore/QDataStream>
#include <QtCore/QStandardPaths>
#include <QtCore/QCryptographicHash>
#include <QtNetwork/QLocalServer>
#include <QtNetwork/QLocalSocket>
#include "singleapplication.h"
#include "singleapplication_p.h"
#ifdef Q_OS_WIN
#include <windows.h>
#include <lmcons.h>
#endif
SingleApplicationPrivate::SingleApplicationPrivate( SingleApplication *q_ptr )
: q_ptr( q_ptr )
{
server = nullptr;
socket = nullptr;
}
SingleApplicationPrivate::~SingleApplicationPrivate()
{
if( socket != nullptr ) {
socket->close();
delete socket;
}
memory->lock();
InstancesInfo* inst = static_cast<InstancesInfo*>(memory->data());
if( server != nullptr ) {
server->close();
delete server;
inst->primary = false;
inst->primaryPid = -1;
inst->checksum = blockChecksum();
}
memory->unlock();
delete memory;
}
void SingleApplicationPrivate::genBlockServerName()
{
QCryptographicHash appData( QCryptographicHash::Sha256 );
appData.addData( "SingleApplication", 17 );
appData.addData( SingleApplication::app_t::applicationName().toUtf8() );
appData.addData( SingleApplication::app_t::organizationName().toUtf8() );
appData.addData( SingleApplication::app_t::organizationDomain().toUtf8() );
if( ! (options & SingleApplication::Mode::ExcludeAppVersion) ) {
appData.addData( SingleApplication::app_t::applicationVersion().toUtf8() );
}
if( ! (options & SingleApplication::Mode::ExcludeAppPath) ) {
#ifdef Q_OS_WIN
appData.addData( SingleApplication::app_t::applicationFilePath().toLower().toUtf8() );
#else
appData.addData( SingleApplication::app_t::applicationFilePath().toUtf8() );
#endif
}
// User level block requires a user specific data in the hash
if( options & SingleApplication::Mode::User ) {
#ifdef Q_OS_WIN
Q_UNUSED(timeout);
wchar_t username [ UNLEN + 1 ];
// Specifies size of the buffer on input
DWORD usernameLength = UNLEN + 1;
if( GetUserNameW( username, &usernameLength ) ) {
appData.addData( QString::fromWCharArray(username).toUtf8() );
} else {
appData.addData( QStandardPaths::standardLocations( QStandardPaths::HomeLocation ).join("").toUtf8() );
}
#endif
#ifdef Q_OS_UNIX
QProcess process;
process.start( "whoami" );
if( process.waitForFinished( 100 ) &&
process.exitCode() == QProcess::NormalExit) {
appData.addData( process.readLine() );
} else {
appData.addData(
QDir(
QStandardPaths::standardLocations( QStandardPaths::HomeLocation ).first()
).absolutePath().toUtf8()
);
}
#endif
}
// Replace the backslash in RFC 2045 Base64 [a-zA-Z0-9+/=] to comply with
// server naming requirements.
blockServerName = appData.result().toBase64().replace("/", "_");
}
void SingleApplicationPrivate::initializeMemoryBlock()
{
InstancesInfo* inst = static_cast<InstancesInfo*>( memory->data() );
inst->primary = false;
inst->secondary = 0;
inst->primaryPid = -1;
inst->checksum = blockChecksum();
}
void SingleApplicationPrivate::startPrimary()
{
Q_Q(SingleApplication);
// Successful creation means that no main process exists
// So we start a QLocalServer to listen for connections
QLocalServer::removeServer( blockServerName );
server = new QLocalServer();
// Restrict access to the socket according to the
// SingleApplication::Mode::User flag on User level or no restrictions
if( options & SingleApplication::Mode::User ) {
server->setSocketOptions( QLocalServer::UserAccessOption );
} else {
server->setSocketOptions( QLocalServer::WorldAccessOption );
}
server->listen( blockServerName );
QObject::connect(
server,
&QLocalServer::newConnection,
this,
&SingleApplicationPrivate::slotConnectionEstablished
);
// Reset the number of connections
InstancesInfo* inst = static_cast <InstancesInfo*>( memory->data() );
inst->primary = true;
inst->primaryPid = q->applicationPid();
inst->checksum = blockChecksum();
instanceNumber = 0;
}
void SingleApplicationPrivate::startSecondary()
{
}
void SingleApplicationPrivate::connectToPrimary( int msecs, ConnectionType connectionType )
{
// Connect to the Local Server of the Primary Instance if not already
// connected.
if( socket == nullptr ) {
socket = new QLocalSocket();
}
// If already connected - we are done;
if( socket->state() == QLocalSocket::ConnectedState )
return;
// If not connect
if( socket->state() == QLocalSocket::UnconnectedState ||
socket->state() == QLocalSocket::ClosingState ) {
socket->connectToServer( blockServerName );
}
// Wait for being connected
if( socket->state() == QLocalSocket::ConnectingState ) {
socket->waitForConnected( msecs );
}
// Initialisation message according to the SingleApplication protocol
if( socket->state() == QLocalSocket::ConnectedState ) {
// Notify the parent that a new instance had been started;
QByteArray initMsg;
QDataStream writeStream(&initMsg, QIODevice::WriteOnly);
writeStream.setVersion(QDataStream::Qt_5_6);
writeStream << blockServerName.toLatin1();
writeStream << static_cast<quint8>(connectionType);
writeStream << instanceNumber;
quint16 checksum = qChecksum(initMsg.constData(), static_cast<quint32>(initMsg.length()));
writeStream << checksum;
// The header indicates the message length that follows
QByteArray header;
QDataStream headerStream(&header, QIODevice::WriteOnly);
headerStream.setVersion(QDataStream::Qt_5_6);
headerStream << static_cast <quint64>( initMsg.length() );
socket->write( header );
socket->write( initMsg );
socket->flush();
socket->waitForBytesWritten( msecs );
}
}
quint16 SingleApplicationPrivate::blockChecksum()
{
return qChecksum(
static_cast <const char *>( memory->data() ),
offsetof( InstancesInfo, checksum )
);
}
qint64 SingleApplicationPrivate::primaryPid()
{
qint64 pid;
memory->lock();
InstancesInfo* inst = static_cast<InstancesInfo*>( memory->data() );
pid = inst->primaryPid;
memory->unlock();
return pid;
}
/**
* @brief Executed when a connection has been made to the LocalServer
*/
void SingleApplicationPrivate::slotConnectionEstablished()
{
Q_Q(SingleApplication);
QLocalSocket *nextConnSocket = server->nextPendingConnection();
quint32 instanceId = 0;
ConnectionType connectionType = InvalidConnection;
if( nextConnSocket->waitForReadyRead( 100 ) ) {
// read the fields in same order and format as written
QDataStream headerStream(nextConnSocket);
headerStream.setVersion( QDataStream::Qt_5_6 );
// Read the header to know the message length
quint64 msgLen = 0;
headerStream >> msgLen;
if( msgLen >= sizeof( quint16 ) ) {
// Read the message body
QByteArray msgBytes = nextConnSocket->read(msgLen);
QDataStream readStream(msgBytes);
readStream.setVersion( QDataStream::Qt_5_6 );
// server name
QByteArray latin1Name;
readStream >> latin1Name;
// connection type
quint8 connType = InvalidConnection;
readStream >> connType;
connectionType = static_cast <ConnectionType>( connType );
// instance id
readStream >> instanceId;
// checksum
quint16 msgChecksum = 0;
readStream >> msgChecksum;
const quint16 actualChecksum = qChecksum(msgBytes.constData(), static_cast<quint32>(msgBytes.length() - sizeof(quint16)));
if (readStream.status() != QDataStream::Ok || QLatin1String(latin1Name) != blockServerName || msgChecksum != actualChecksum) {
connectionType = InvalidConnection;
}
}
}
if( connectionType == InvalidConnection ) {
nextConnSocket->close();
delete nextConnSocket;
return;
}
QObject::connect(
nextConnSocket,
&QLocalSocket::aboutToClose,
this,
[nextConnSocket, instanceId, this]() {
Q_EMIT this->slotClientConnectionClosed( nextConnSocket, instanceId );
}
);
QObject::connect(
nextConnSocket,
&QLocalSocket::readyRead,
this,
[nextConnSocket, instanceId, this]() {
Q_EMIT this->slotDataAvailable( nextConnSocket, instanceId );
}
);
if( connectionType == NewInstance || (
connectionType == SecondaryInstance &&
options & SingleApplication::Mode::SecondaryNotification
)
) {
Q_EMIT q->instanceStarted();
}
if( nextConnSocket->bytesAvailable() > 0 ) {
Q_EMIT this->slotDataAvailable( nextConnSocket, instanceId );
}
}
void SingleApplicationPrivate::slotDataAvailable( QLocalSocket *dataSocket, quint32 instanceId )
{
Q_Q(SingleApplication);
Q_EMIT q->receivedMessage( instanceId, dataSocket->readAll() );
}
void SingleApplicationPrivate::slotClientConnectionClosed( QLocalSocket *closedSocket, quint32 instanceId )
{
if( closedSocket->bytesAvailable() > 0 )
Q_EMIT slotDataAvailable( closedSocket, instanceId );
closedSocket->deleteLater();
}

83
SingleApplication/singleapplication_p.h Normal file
View File

@@ -0,0 +1,83 @@
// The MIT License (MIT)
//
// Copyright (c) Itay Grudev 2015 - 2016
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
// W A R N I N G !!!
// -----------------
//
// This file is not part of the SingleApplication API. It is used purely as an
// implementation detail. This header file may change from version to
// version without notice, or may even be removed.
//
#ifndef SINGLEAPPLICATION_P_H
#define SINGLEAPPLICATION_P_H
#include <QtCore/QSharedMemory>
#include <QtNetwork/QLocalServer>
#include <QtNetwork/QLocalSocket>
#include "singleapplication.h"
struct InstancesInfo {
bool primary;
quint32 secondary;
qint64 primaryPid;
quint16 checksum;
};
class SingleApplicationPrivate : public QObject {
Q_OBJECT
public:
enum ConnectionType : quint8 {
InvalidConnection = 0,
NewInstance = 1,
SecondaryInstance = 2,
Reconnect = 3
};
Q_DECLARE_PUBLIC(SingleApplication)
SingleApplicationPrivate( SingleApplication *q_ptr );
~SingleApplicationPrivate();
void genBlockServerName();
void initializeMemoryBlock();
void startPrimary();
void startSecondary();
void connectToPrimary(int msecs, ConnectionType connectionType );
quint16 blockChecksum();
qint64 primaryPid();
SingleApplication *q_ptr;
QSharedMemory *memory;
QLocalSocket *socket;
QLocalServer *server;
quint32 instanceNumber;
QString blockServerName;
SingleApplication::Options options;
public Q_SLOTS:
void slotConnectionEstablished();
void slotDataAvailable( QLocalSocket*, quint32 );
void slotClientConnectionClosed( QLocalSocket*, quint32 );
};
#endif // SINGLEAPPLICATION_P_H

2
qelectrotech.pro
View File

@@ -70,6 +70,8 @@ DEFINES += QET_ALLOW_OVERRIDE_CD_OPTION
include(sources/PropertiesEditor/PropertiesEditor.pri)
include(sources/QetGraphicsItemModeler/QetGraphicsItemModeler.pri)
include(sources/QPropertyUndoCommand/QPropertyUndoCommand.pri)
include(SingleApplication/singleapplication.pri)
DEFINES += QAPPLICATION_CLASS=QApplication
TEMPLATE = app
DEPENDPATH += .

20
sources/main.cpp
View File

@@ -16,6 +16,8 @@
along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qetapp.h"
#include "singleapplication.h"
#include "qet.h"
/**
* @brief main
@@ -37,5 +39,21 @@ int main(int argc, char **argv)
#else
qputenv("QT_DEVICE_PIXEL_RATIO", QByteArray("auto"));
#endif
return(QETApp(argc, argv).exec());
SingleApplication app(argc, argv);
if (app.isSecondary())
{
QStringList strl = app.arguments();
//Remove the first argument, it's the binary file
strl.takeFirst();
QString message = "launched-with-args: " + QET::joinWithSpaces(strl);
app.sendMessage(message.toUtf8());
return 0;
}
QETApp qetapp;
QObject::connect(&app, &SingleApplication::receivedMessage, &qetapp, &QETApp::receiveMessage);
return app.exec();
}

131
sources/qetapp.cpp
View File

@@ -60,50 +60,28 @@ RecentFiles *QETApp::m_elements_recent_files = nullptr;
TitleBlockTemplate *QETApp::default_titleblock_template_ = nullptr;
QString QETApp::m_user_common_elements_dir = QString();
QString QETApp::m_user_custom_elements_dir = QString();
QETApp *QETApp::m_qetapp = nullptr;
/**
Constructeur
@param argc Nombre d'arguments passes a l'application
@param argv Arguments passes a l'application
*/
QETApp::QETApp(int &argc, char **argv) :
QETSingleApplication(argc, argv, QString("qelectrotech-" + QETApp::userName())),
* @brief QETApp::QETApp
*/
QETApp::QETApp() :
m_splash_screen(nullptr),
non_interactive_execution_(false)
{
m_qetapp = this;
parseArguments();
initConfiguration();
initLanguage();
QET::Icons::initIcons();
initStyle();
if (!non_interactive_execution_ && isRunning()) {
// envoie les arguments a l'instance deja existante
non_interactive_execution_ = sendMessage(
"launched-with-args: " +
QET::joinWithSpaces(QStringList(qet_arguments_.arguments()))
);
}
if (non_interactive_execution_) {
std::exit(EXIT_SUCCESS);
}
initSplashScreen();
initSystemTray();
// prise en compte des messages des autres instances
connect(this, SIGNAL(messageAvailable(QString)), this, SLOT(messageReceived(const QString&)));
// nettoyage avant de quitter l'application
connect(this, SIGNAL(aboutToQuit()), this, SLOT(cleanup()));
// connexion pour le signalmapper
connect(&signal_map, SIGNAL(mapped(QWidget *)), this, SLOT(invertMainWindowVisibility(QWidget *)));
setQuitOnLastWindowClosed(false);
connect(this, SIGNAL(lastWindowClosed()), this, SLOT(checkRemainingWindows()));
qApp->setQuitOnLastWindowClosed(false);
connect(qApp, &QApplication::lastWindowClosed, this, &QETApp::checkRemainingWindows);
setSplashScreenStep(tr("Chargement... Initialisation du cache des collections d'éléments", "splash screen caption"));
if (!collections_cache_) {
@@ -112,14 +90,16 @@ QETApp::QETApp(int &argc, char **argv) :
collections_cache_->setLocale(langFromSetting());
}
// on ouvre soit les fichiers passes en parametre soit un nouvel editeur de projet
if (qet_arguments_.files().isEmpty()) {
if (qet_arguments_.files().isEmpty())
{
setSplashScreenStep(tr("Chargement... Éditeur de schéma", "splash screen caption"));
new QETDiagramEditor();
} else {
} else
{
setSplashScreenStep(tr("Chargement... Ouverture des fichiers", "splash screen caption"));
openFiles(qet_arguments_);
}
buildSystemTrayMenu();
m_splash_screen -> hide();
@@ -160,8 +140,9 @@ QETApp::~QETApp()
/**
@return l'instance de la QETApp
*/
QETApp *QETApp::instance() {
return(static_cast<QETApp *>(qApp));
QETApp *QETApp::instance()
{
return m_qetapp;
}
/**
@@ -176,7 +157,7 @@ void QETApp::setLanguage(const QString &desired_language) {
if (!qtTranslator.load("qt_" + desired_language, qt_l10n_path)) {
qtTranslator.load("qt_" + desired_language, languages_path);
}
installTranslator(&qtTranslator);
qApp->installTranslator(&qtTranslator);
// charge les traductions pour l'application QET
if (!qetTranslator.load("qet_" + desired_language, languages_path)) {
@@ -186,7 +167,7 @@ void QETApp::setLanguage(const QString &desired_language) {
qetTranslator.load("qet_en", languages_path);
}
}
installTranslator(&qetTranslator);
qApp->installTranslator(&qetTranslator);
QString ltr_special_string = tr(
"LTR",
@@ -211,7 +192,7 @@ QString QETApp::langFromSetting()
Switches the application to the provided layout.
*/
void QETApp::switchLayout(Qt::LayoutDirection direction) {
setLayoutDirection(direction);
qApp->setLayoutDirection(direction);
}
/**
@@ -440,26 +421,6 @@ TitleBlockTemplatesCollection *QETApp::titleBlockTemplatesCollection(const QStri
return(nullptr);
}
/**
@return le nom de l'utilisateur courant
*/
QString QETApp::userName() {
QProcess * process = new QProcess();
QString str;
#ifndef Q_OS_WIN32
// return(QString(getenv("USER")));
str = (process->processEnvironment()).value("USER", "UNKNOWN");
delete process;
return(str);
#else
// return(QString(getenv("USERNAME")));
str = (process->processEnvironment()).value("USERNAME", "UNKNOWN");
delete process;
return(str);
#endif
}
/**
* @brief QETApp::commonElementsDir
* @return the dir path of the common elements collection.
@@ -1015,11 +976,18 @@ QList<QETElementEditor *> QETApp::elementEditors(QETProject *project) {
return(editors);
}
/**
Nettoie certaines choses avant que l'application ne quitte
*/
void QETApp::cleanup() {
m_qsti -> hide();
void QETApp::receiveMessage(int instanceId, QByteArray message)
{
Q_UNUSED(instanceId);
QString str(message);
if (str.startsWith("launched-with-args: "))
{
QString my_message(str.mid(20));
QStringList args_list = QET::splitWithSpaces(my_message);
openFiles(QETArguments(args_list));
}
}
/**
@@ -1028,7 +996,7 @@ void QETApp::cleanup() {
*/
template <class T> QList<T *> QETApp::detectWindows() const {
QList<T *> windows;
foreach(QWidget *widget, topLevelWidgets()) {
foreach(QWidget *widget, qApp->topLevelWidgets()) {
if (!widget -> isWindow()) continue;
if (T *window = qobject_cast<T *>(widget)) {
windows << window;
@@ -1118,8 +1086,8 @@ if defined(Q_OS_WIN)
*/
void QETApp::useSystemPalette(bool use) {
if (use) {
setPalette(initial_palette_);
setStyleSheet(
qApp->setPalette(initial_palette_);
qApp->setStyleSheet(
"QTabBar::tab:!selected { background-color: transparent; }"
"QAbstractScrollArea#mdiarea {"
"background-color -> setPalette(initial_palette_);"
@@ -1129,7 +1097,7 @@ void QETApp::useSystemPalette(bool use) {
QFile file(configDir() + "style.css");
file.open(QFile::ReadOnly);
QString styleSheet = QLatin1String(file.readAll());
setStyleSheet(styleSheet);
qApp->setStyleSheet(styleSheet);
file.close();
}
}
@@ -1140,7 +1108,7 @@ void QETApp::useSystemPalette(bool use) {
*/
void QETApp::quitQET() {
if (closeEveryEditor()) {
quit();
qApp->quit();
}
}
@@ -1158,25 +1126,12 @@ void QETApp::checkRemainingWindows() {
QTimer::singleShot(500, this, SLOT(checkRemainingWindows()));
} else {
if (!diagramEditors().count() && !elementEditors().count()) {
quit();
qApp->quit();
}
}
sleep = !sleep;
}
/**
Gere les messages recus
@param message Message recu
*/
void QETApp::messageReceived(const QString &message) {
if (message.startsWith("launched-with-args: ")) {
QString my_message(message.mid(20));
// les arguments sont separes par des espaces non echappes
QStringList args_list = QET::splitWithSpaces(my_message);
openFiles(QETArguments(args_list));
}
}
/**
Ouvre les fichiers passes en arguments
@param args Objet contenant des arguments ; les fichiers
@@ -1371,7 +1326,7 @@ void QETApp::openTitleBlockTemplateFiles(const QStringList &files_list) {
*/
void QETApp::configureQET() {
// determine le widget parent a utiliser pour le dialogue
QWidget *parent_widget = activeWindow();
QWidget *parent_widget = qApp->activeWindow();
// cree le dialogue
ConfigDialog cd;
@@ -1399,7 +1354,7 @@ void QETApp::configureQET() {
*/
void QETApp::aboutQET()
{
AboutQET aq(activeWindow());
AboutQET aq(qApp->activeWindow());
#ifdef Q_OS_MACOS
aq.setWindowFlags(Qt::Sheet);
@@ -1413,7 +1368,7 @@ void QETApp::aboutQET()
*/
QList<QWidget *> QETApp::floatingToolbarsAndDocksForMainWindow(QMainWindow *window) const {
QList<QWidget *> widgets;
foreach(QWidget *qw, topLevelWidgets()) {
foreach(QWidget *qw, qApp->topLevelWidgets()) {
if (!qw -> isWindow()) continue;
if (qobject_cast<QToolBar *>(qw) || qobject_cast<QDockWidget *>(qw)) {
if (qw -> parent() == window) widgets << qw;
@@ -1436,7 +1391,7 @@ QList<QWidget *> QETApp::floatingToolbarsAndDocksForMainWindow(QMainWindow *wind
*/
void QETApp::parseArguments() {
// recupere les arguments
QList<QString> arguments_list(arguments());
QList<QString> arguments_list(qApp->arguments());
// enleve le premier argument : il s'agit du fichier binaire
arguments_list.takeFirst();
@@ -1499,7 +1454,7 @@ void QETApp::setSplashScreenStep(const QString &message) {
if (!message.isEmpty()) {
m_splash_screen -> showMessage(message, Qt::AlignBottom | Qt::AlignLeft);
}
processEvents();
qApp->processEvents();
}
/**
@@ -1514,7 +1469,7 @@ void QETApp::initLanguage() {
* Setup the gui style
*/
void QETApp::initStyle() {
initial_palette_ = palette();
initial_palette_ = qApp->palette();
//Apply or not the system style
QSettings settings;
@@ -1823,7 +1778,7 @@ bool QETApp::event(QEvent *e) {
*/
void QETApp::printHelp() {
QString help(
tr("Usage : ") + QFileInfo(applicationFilePath()).fileName() + tr(" [options] [fichier]...\n\n") +
tr("Usage : ") + QFileInfo(qApp->applicationFilePath()).fileName() + tr(" [options] [fichier]...\n\n") +
tr("QElectroTech, une application de réalisation de schémas électriques.\n\n"
"Options disponibles : \n"
" --help Afficher l'aide sur les options\n"

13
sources/qetapp.h
View File

@@ -21,8 +21,8 @@
#include <QTranslator>
#include <QSystemTrayIcon>
#include <QPalette>
#include <QByteArray>
#include "qetsingleapplication.h"
#include "elementslocation.h"
#include "templatelocation.h"
#include "qetarguments.h"
@@ -50,12 +50,12 @@ class RecentFiles;
/**
This class represents the QElectroTech application.
*/
class QETApp : public QETSingleApplication
class QETApp : public QObject
{
Q_OBJECT
// constructors, destructor
public:
QETApp(int &, char **);
QETApp();
~QETApp() override;
private:
@@ -81,7 +81,6 @@ class QETApp : public QETSingleApplication
static QList<TitleBlockTemplatesCollection *> availableTitleBlockTemplatesCollections();
static TitleBlockTemplatesCollection *titleBlockTemplatesCollection(const QString &);
static QString userName();
static QString commonElementsDir();
static QString customElementsDir();
static QString commonElementsDirN();
@@ -148,6 +147,7 @@ class QETApp : public QETSingleApplication
// attributes
private:
static QETApp *m_qetapp;
QTranslator qtTranslator;
QTranslator qetTranslator;
QSystemTrayIcon *m_qsti;
@@ -207,7 +207,6 @@ class QETApp : public QETSingleApplication
void useSystemPalette(bool);
void quitQET();
void checkRemainingWindows();
void messageReceived(const QString &);
void openFiles(const QETArguments &);
void openProjectFiles(const QStringList &);
void openElementFiles(const QStringList &);
@@ -217,9 +216,7 @@ class QETApp : public QETSingleApplication
void openTitleBlockTemplateFiles(const QStringList &);
void configureQET();
void aboutQET();
private slots:
void cleanup();
void receiveMessage(int instanceId, QByteArray message);
private:
template <class T> QList<T *> detectWindows() const;

120
sources/qetsingleapplication.cpp
View File

@@ -1,120 +0,0 @@
/*
Copyright 2006-2017 The QElectroTech Team
This file is part of QElectroTech.
QElectroTech is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
QElectroTech is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTAvBILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qetsingleapplication.h"
#include <QLocalSocket>
const int QETSingleApplication::timeout_ = 10000;
/**
Constructeur
@param argc Nombre d'arguments passes au programme par le systeme
@param argv Tableau des arguments passes au programme par le systeme
@param unique_key Cle unique
*/
QETSingleApplication::QETSingleApplication(int &argc, char **argv, const QString& unique_key) :
QApplication(argc, argv),
unique_key_(unique_key)
{
// verifie s'il y a un segment de memoire partage correspondant a la cle unique
#if defined (Q_OS_OS2)
#define QT_NO_SHAREDMEMORY
{
#else
shared_memory_.setKey(unique_key_);
if (shared_memory_.attach()) {
// oui : l'application est deja en cours d'execution
is_running_ = true;
} else {
// non : il s'agit du premier demarrage de l'application pour cette cle unique
is_running_ = false;
// initialisation du segment de memoire partage
if (!shared_memory_.create(1)) {
qDebug() << "QETSingleApplication::QETSingleApplication() : Impossible de créer l'instance unique" << qPrintable(unique_key_);
return;
}
#endif
// initialisation d'un serveur local pour recevoir les messages des autres instances
local_server_ = new QLocalServer(this);
connect(local_server_, SIGNAL(newConnection()), this, SLOT(receiveMessage()));
// la cle unique est egalement utilise pour le serveur
local_server_ -> listen(unique_key_);
}
}
/**
Destructeur
*/
QETSingleApplication::~QETSingleApplication() {
}
/**
Slot gerant la reception des messages.
Lorsque l'application recoit un message, ce slot emet le signal
messageAvailable avec le message recu.
*/
void QETSingleApplication::receiveMessage() {
QLocalSocket *local_socket = local_server_ -> nextPendingConnection();
if (!local_socket -> waitForReadyRead(timeout_)) {
qDebug() << "QETSingleApplication::receiveMessage() :" << qPrintable(local_socket -> errorString()) << "(" << qPrintable(unique_key_) << ")";
return;
}
QByteArray byteArray = local_socket -> readAll();
QString message = QString::fromUtf8(byteArray.constData());
emit(messageAvailable(message));
local_socket -> disconnectFromServer();
}
/**
@return true si l'application est deja en cours d'execution
*/
bool QETSingleApplication::isRunning() {
return(is_running_);
}
/**
Envoie un message a l'application. Si celle-ci n'est pas en cours
d'execution, cette methode ne fait rien.
@param message Message a transmettre a l'application
@return true si le message a ete tranmis, false sinon
*/
bool QETSingleApplication::sendMessage(const QString &message) {
// l'application doit etre en cours d'execution
if (!is_running_) {
return(false);
}
// se connecte a l'application, avec gestion du timeout
QLocalSocket local_socket(this);
local_socket.connectToServer(unique_key_, QIODevice::WriteOnly);
if (!local_socket.waitForConnected(timeout_)) {
qDebug() << "QETSingleApplication::sendMessage() :" << qPrintable(local_socket.errorString()) << "(" << qPrintable(unique_key_) << ")";
return(false);
}
// envoi du message, avec gestion du timeout
local_socket.write(message.toUtf8());
if (!local_socket.waitForBytesWritten(timeout_)) {
qDebug() << "QETSingleApplication::sendMessage() :" << qPrintable(local_socket.errorString()) << "(" << qPrintable(unique_key_) << ")";
return(false);
}
// deconnexion
local_socket.disconnectFromServer();
return(true);
}

60
sources/qetsingleapplication.h
View File

@@ -1,60 +0,0 @@
/*
Copyright 2006-2017 The QElectroTech Team
This file is part of QElectroTech.
QElectroTech is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
QElectroTech is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef QET_SINGLE_APPLICATION_H
#define QET_SINGLE_APPLICATION_H
#include <QApplication>
#include <QSharedMemory>
#include <QLocalServer>
/**
This class represents a Qt Application executing only a single instance
depending on a unique string key.
*/
class QETSingleApplication : public QApplication {
Q_OBJECT
// constructors, destructor
public:
QETSingleApplication(int &, char **, const QString&);
~QETSingleApplication() override;
private:
QETSingleApplication(const QETSingleApplication &);
// methods
public:
bool isRunning();
bool sendMessage(const QString &);
public slots:
void receiveMessage();
signals:
void messageAvailable(QString);
// attributes
private:
bool is_running_;
QString unique_key_;
#if defined (Q_OS_OS2)
#define QT_NO_SHAREDMEMORY
#else
QSharedMemory shared_memory_;
#endif
QLocalServer *local_server_;
static const int timeout_;
};
#endif