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Subcalssing MDIClient window procedure

Posted on 1997-09-06
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Last Modified: 2013-11-20
I would lik to subclass the MDICLient window to control painting in this area.  Is anyone able to help me do this when using MFC? Doing this using the standard C API is relatively straight forward. Thanks
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Question by:DunX
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Expert Comment

by:davmarc
ID: 1305859
With MFC subclassing is maybe even easier.
Get a HWND of the MDICLIENT window and call SubclassWindow() against the window that is intended to receive the messages before the original target.

Davide Marcato.
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by:DunX
ID: 1305860
OK! perhaps I should have been more explicit.  Strictly speaking this is the correct answer but I was hoping for a more detailed explanation of how it actually works.  All I want to do is to trap the WM_PAINT message of the MDICLIENT window and paint on it.  What I have done is create a class using the cWnd as the base class and provide this with a message handler for the OnPaint event.  In this handler I draw on the DC but get rather strange behaviour when sizing the window - repainting does not occur correctly - sometime it seems no repaint message is event sent.  Try it by simply printing text to the middle of the MDI application window.  Let me know if you have further explanation of how to achieve this - sample code would be good !! (or I can send you mine to review)  Thanks Duncan
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davmarc earned 200 total points
ID: 1305861
Maybe KB article Q129471 "How to SubClass the MDIClient by Using MFC" can help you, altough it says mostly what I explained in my first answer.

Send along your code, I'll try to find some time to review it.

Davide Marcato.
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