how to restart my own qt application?

Question

i just asking myself how to restart my own qt application?

Can somebody please show me an example?

Answer 1

I just used the method described above and I noticed that my application crashes on restart. ...then I switched the following lines of code:

if(app) delete app;
if(main_window) delete main_window;

to:

if(main_window) delete main_window;
if(app) delete app;

and it behaves OK. For some reason the window must be deleted first. Just a note for future readers.

---

EDIT: ...and a different approach for those who want a real process-restart: You can declare a myApp::Restart() method in your subclass of QApplication. The following version works OK on both MS-Windows & MacOS:

// Restart Application
void myApp::Restart(bool Abort)
{
    // Spawn a new instance of myApplication:
    QProcess proc;
#ifdef Q_OS_WIN
    proc.start(this->applicationFilePath());
#endif    

#ifdef Q_OS_MAC
    // In Mac OS the full path of aplication binary is:
    //    /myApp.app/Contents/MacOS/myApp
    QStringList args;
    args << (this->applicationDirPath() + "/../../../myApp.app");
    proc.start("open", args);
#endif

    // Terminate current instance:
    if (Abort) // Abort Application process (exit immediattely)
        ::exit(0);
    else
        this->exit(0); // Exit gracefully by terminating the myApp instance
}