问题
After migrate project from Qt4 to Qt5 version on Windows OS lost "beep" sound on QMessageBox::(information/critical/warning/question) function. Hove can I retrieve it?
回答1:
Unfortunately there is no option to enable beep sound in QMessageBox. But you can use QApplication::beep() when you show message box.
If you don't want call beep() where you show message box and if you you think that you really need this, you can subclass QMessageBox and add some method which will call QApplication::beep()
来源：https://stackoverflow.com/questions/26997999/qmessagebox-and-beep-after-migrate-from-4-to-5-qt