qt single instance solution for PySide qt 4.7

据说，qt本来是有一个 QtSolution这么个东西的，后来更新不及时。

没有对应qt 4.7的版本。

经google，发现PySide官网就有解药。

http://developer.qt.nokia.com/forums/viewthread/5733

下面是大致解法说明。

// try to connect to your server
m_socket = QLocalSocket()
m_socket.connectToServer(qApp.applicationName(), QIODevice.ReadOnly)

//If this fail is because the app is not running then create the server, then in the next time the connect will work
m_server = QLocalServer()
m_server = QLocalServer.listen(qApp.applicationName())

晚点搞一个完整版本来试试看。

########################## 

再仔细一看，该页面最后一行，有人已经有解法了。

http://www.dallagnese.fr/en/computers-it/recette-python-qt4-qsingleapplication-pyside/

##########################

  
    

   
     """
   
     
 The MIT License

 Copyright 2011 Thomas Dall'Agnese <[email protected]>

 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.


   
     """
   
     

   
     __author__
   
      
   
     =
   
      
   
     "
   
     Thomas Dall'Agnese
   
     "
   
     

   
     __email__
   
      
   
     =
   
      
   
     "
   
     [email protected]
   
     "
   
     

   
     __version__
   
      
   
     =
   
      
   
     "
   
     1.0
   
     "
   
     

   
     __URL__
   
      
   
     =
   
      
   
     "
   
     http://www.dallagnese.fr
   
     "
   
     


   
     from
   
      PySide.QtGui 
   
     import
   
      QMessageBox, QApplication

   
     from
   
      PySide.QtCore 
   
     import
   
      QIODevice, QTimer, QCoreApplication

   
     from
   
      PySide.QtNetwork 
   
     import
   
      QLocalServer, QLocalSocket

   
     import
   
      sys


   
     class
   
      QSingleApplication(QApplication):
 
   
     def
   
      singleStart(self, mainWindow):
 self.mainWindow 
   
     =
   
      mainWindow
 
   
     #
   
      Socket
   
     

   
      self.m_socket 
   
     =
   
      QLocalSocket()
 self.m_socket.connected.connect(self.connectToExistingApp)
 self.m_socket.error.connect(self.startApplication)
 self.m_socket.connectToServer(self.applicationName(), QIODevice.WriteOnly)
 
   
     def
   
      connectToExistingApp(self):
 
   
     if
   
      len(sys.argv)
   
     >
   
     1
   
      
   
     and
   
      sys.argv[
   
     1
   
     ] 
   
     is
   
      
   
     not
   
      None:
 self.m_socket.write(sys.argv[
   
     1
   
     ])
 self.m_socket.bytesWritten.connect(self.quit)
 
   
     else
   
     :
 QMessageBox.warning(None, self.tr(
   
     "
   
     Already running
   
     "
   
     ), self.tr(
   
     "
   
     The program is already running.
   
     "
   
     ))
 
   
     #
   
      Quit application in 250 ms
   
     

   
      QTimer.singleShot(
   
     250
   
     , self.quit)
 
   
     def
   
      startApplication(self):
 self.m_server 
   
     =
   
      QLocalServer()
 
   
     if
   
      self.m_server.listen(self.applicationName()):
 self.m_server.newConnection.connect(self.getNewConnection)
 self.mainWindow.show()
 
   
     else
   
     :
 QMessageBox.critical(None, self.tr(
   
     "
   
     Error
   
     "
   
     ), self.tr(
   
     "
   
     Error listening the socket.
   
     "
   
     ))
 
   
     def
   
      getNewConnection(self):
 self.new_socket 
   
     =
   
      self.m_server.nextPendingConnection()
 self.new_socket.readyRead.connect(self.readSocket)
 
   
     def
   
      readSocket(self):
 f 
   
     =
   
      self.new_socket.readLine()
 self.mainWindow.getArgsFromOtherInstance(str(f))
 self.mainWindow.activateWindow()
 self.mainWindow.show()


   
     if
   
      
   
     __name__
   
      
   
     ==
   
      
   
     '
   
     __main__
   
     '
   
     :
 
   
     from
   
      PySide.QtGui 
   
     import
   
      QMainWindow, QLabel
 
   
     class
   
      DallAgneseWindow(QMainWindow):
 
   
     def
   
      
   
     __init__
   
     (self):
 QMainWindow.
   
     __init__
   
     (self)
 self.setWindowTitle(
   
     "
   
     QSingleApplication Demo
   
     "
   
     )
 labelText 
   
     =
   
      
   
     "
   
     <b>dallagnese.fr recipe</b><br /><br />\
 Allows you to start your program only once.<br />\
 Parameters of later calls can be handled by this application.
   
     "
   
     
 self.setCentralWidget(QLabel(labelText))
 
   
     def
   
      getArgsFromOtherInstance(self, args):
 QMessageBox.information(self, self.tr(
   
     "
   
     Received args from another instance
   
     "
   
     ),args)
 app 
   
     =
   
      QSingleApplication(sys.argv)
 app.setApplicationName(
   
     "
   
     dallagnese.fr recipe 01
   
     "
   
     )
 myWindow 
   
     =
   
      DallAgneseWindow()
 app.singleStart(myWindow)
 sys.exit(app.exec_())