The problem occurs after the application is minimized to the system tray: If I close the message box, that app show me, the app will be closed too(I used a QSystemTrayIcon -example from this site). Where can be a problem?
Thank you for answers beforehand.
This is required in main.cpp (after QApplication definition):
(and your main class must be subclassed this way:
class YourClass : public QSystemTrayIcon)
Thank you for your answer.
Actually that one "yourApp.setQuitOnLastWindowClosed(false);" was enough.