Tray icon & taskbar app button hide

[been_1990]

I want to have my application to be maximized while being shown at the systray in Windows. I tried this (following the QT Demos):

private:
QSystemTrayIcon *trayIcon;  
..............{}.................
trayIcon->setVisible(true);
trayIcon->show();

private:
QSystemTrayIcon *trayIcon;  
..............{}.................
trayIcon->setVisible(true);
trayIcon->show();

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But that only crashes the application. And I'm clueless. I also needed to have the app's taskbar button to hide itself. I did some searching but didnt find anything up-to-date. Any help is welcome and thanked.