'X' button signal

How do I catch the signal from the main application 'X' button, used to terminate the application?

on your header add these:

Code:

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class QPushButton;
private slots: xButtonPressed();
private: QPushButton *x;

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and then on you c++ file add this.

Code:

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connect(xButton,SIGNAL(clicked()),this,xButtonPressed()));
MainWindowName::xButtonPressed(){
//app close function
}

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Quote:

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How do I catch the signal from the main application 'X' button

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You don't, it doesn't emit a Qt signal. You can intercept the closing of your program by re-implementing the QWidget::closeEvent() of your top level widget class.

I hope you are talking about close (X) button at right hand side of title bar of the window. If it is so then.

Yes totally.. It doesn't emit any signal. There is closeEvent() of QWidget either you have to re-implement it, otherwise you can try using event filters.