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MFC GetParentFrame() returns NULL

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I write this little post to record a small fact that you may have to pay attention to when you create your new CView inside your CFrameWnd.

By default, when you use Visual Studio’s resource editor to add a new dialog template for your CView class, the window style of that dialog template includes WS_POPUP. This normally doesn’t crash your program. However, we may want to call GetParentFrame() function within our CView from time to time, and if WS_POPUP is present, the function will return NULL pointer, causing memory access violation exception.

So, whenever you create CView within a frame window, pay attention to window style given by Visual Studio, and change WS_POPUP to WS_CHILD if needed.

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Written by Ying

18/03/2011 at 10:14

Posted in C++, Programming, Technology, Windows

Tagged with ,