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MFC Library Reference
CWnd::Invalidate



Remarks
The client area is marked for painting when the next WM_PAINT message occurs. The region can also be validated before a WM_PAINT message occurs by the ValidateRect or ValidateRgn member function.

The bErase parameter specifies whether the background within the update area is to be erased when the update region is processed. If bErase is TRUE, the background is erased when the BeginPaint member function is called; if bErase is FALSE, the background remains unchanged. If bErase is TRUE for any part of the update region, the background in the entire region, not just in the given part, is erased.

Windows sends a WM_PAINT message whenever the CWnd update region is not empty and there are no other messages in the application queue for that window.
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