Many Ways to Skin a Window

Every couple of years, users of a Microsoft Windows application I wrote a long time ago start complaining that the application crashes when they exit from it. Every time it turns out that the reason is a Windows message that tells the application's main window to close in a way that was not originally foreseen.

Up to now I've collected four ways in which Windows can destroy a Window. I'm posting them here, because they may help other unfortunate puzzled souls. A window can be destroyed through the following messages.

	(msg == WM_CLOSE) ||
	(msg == WM_NCDESTROY) ||
	(msg == WM_SYSCOMMAND && wParam == SC_CLOSE) ||
	(msg == WM_NCLBUTTONDOWN && wParam == HTCLOSE);

Comments   Toot! Tweet Share