Qt settings Attribute setattribute (qt::wa_deleteonclose) error condition

In Qt GUI programming, Qwidget and its subclasses are often displayed as parent controls, with several controls added to it.

The window needs to be destroyed when the Qwidget and its subclass windows are closed.

If it is defined on the stack:

MainWindow W; W.show ();

After adding: SetAttribute (Qt::wa_deleteonclose) in the constructor,

An exception will occur when closing, because when the main method is exited, the window is automatically destroyed, and the SetAttribute method causes Qt to destroy the window again, resulting in two deletes, resulting in an error.

If defined on the heap:

MainWindow *w = new MainWindow; W->show ();

When off, the main method is not automatically destroyed, and Qt is destroyed according to the setattribute settings. No error.

Qt settings Attribute setattribute (qt::wa_deleteonclose) error condition