What is the proper way of restarting QApplication?

Question

I'm Working with PySide, and seeking a way to restart my Qt app. Does this depends on python, or it has to be controlled by Qt?

BY ROSTYSLAV'S SUGGESTION BELLOW :

class MyAppMainWindow(QMainWindow):
    def __init__(self):

        self.EXIT_CODE_REBOOT = -15123123
        exit_code = self.EXIT_CODE_REBOOT

    def slotReboot(self):

        print "Performing application reboot.."
        qApp.exit( self.EXIT_CODE_REBOOT )

def main():
    currentExitCode = 0
    app = QApplication(sys.argv)
    ex = MyAppMainWindow()

    while currentExitCode == ex.EXIT_CODE_REBOOT :
        currentExitCode = app.exec_()

        return currentExitCode

if __name__ == '__main__':
    main()

Obviously I didn't fully understand. Pleas help.

Answer 1

There's a nice way presented by Qt Wiki on how to make your application restartable. The approach is based on recreation of QApplication instance and not killing current process.

It can be easily adopted to PySide like the next snippet shows:

EXIT_CODE_REBOOT = -15123123 # you can use any unique value here
exit_code = EXIT_CODE_REBOOT # Just for making cycle run for the first time

while exit_code == EXIT_CODE_REBOOT:
    exit_code = 0                       # error code - no errors happened
    app = QApplication(sys.argv)
    ...
    exit_code = app.exec() 

You just need to setup proper exit code through the API presenteed by QApplication before finishing your app. The you can hook up new configuration or whatever you need when new application instance is created.