Qt: How do I handle the event of the user pressing the 'X' (close) button?

Question

I am developing an application using Qt. I don\'t know which slot corresponds to the event of \"the user clicking the \'X\'(close) button of the window frame\" i.e. this but

Answer 1

You can attach a SLOT to the

void aboutToQuit();

signal of your QApplication. This signal should be raised just before app closes.