How to close QMainWindow by itself

[bagusflyer]

I'm trying to use close() function to close my QMainWindow object which is the only window opened. But failed. It did triggered the QCloseEvent just like I pressed X button. I don't know why? Can anybody advise? Thanks

[ChrisW67]

It sent a QCloseEvent because that's what it is meant to do.

How did it fail?
What does QWidget::close() return?
If you are providing your own QWidget::closeEvent() handler then make sure it is QEvent::accept()-ing the event.