A strange problem of QT. After Qt: Tool is set, click the OK cancel button in the pop-up dialog box to exit the program directly.

Alright, I found the reason. qwidget: Create () clears the QT: wa_quitonclose attribute for anything but QT: window, QT: widget or QT: dialog. the workaround is to call for example qwidget: Show () first, and set the attribute by hand afterwards:

Qt code:

Switch view # include <qtgui> intmain (intargc, char * argv []) {qapplicationapp (argc, argv); qmain1_wwin (0, QT: tool); win. show (); // must be called before setting QT: wa_quitonclosewin.setattribute (QT: wa_quitonclose);returnapp.exe C ();}