OnClose() Event not called when i close my Dockable Window

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I created a project in MFC, in which i choose Visual Studio Style Application.

In it i deleted the existing dockable windows.

I created my own dockable window under name "CMyDockWindow"

When i run the project its working fine, showing a dock window..

i added an OnClose() event in that "CMyDockWindow" class.

but when i close my dock window in my app, the event doesnt fired.

i have added that OnClose() routine using wizard, and its not showing any errors.

Is it ON_WM_CLOSE() hit when i close my Dock Window?

Posted 4-Jun-12 9:14am

Harmanjeet Singh

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nv3 · Answer 1 · 2012-06-04T10:37:00

WM_CLOSE is not always called on a window. The windows documentation states:

The WM_CLOSE message is sent as a signal that a window or an application should terminate.

Normally you catch WM_CLOSE to implement a user prompt, when the user has left some unsaved changes. Then, to really close the window you would call DestroyWindow, which in turn generates a WM_DESTROY and a WM_NCDESTROY message.

Better catch WM_NCDESTROY, which is the last message that a window ever sees. That's a good point to do cleanup.