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InvalidateRect and GetUpdateRect

Posted on 1999-01-29
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Last Modified: 2013-12-03
What are all the cases in which the following lines yield b==0 ?
   
    InvalidateRect( hWnd, NULL, TRUE ) ;
    BOOL b = GetUpdateRect ( hWnd, NULL, TRUE ) ;
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Question by:gil_mo
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nietod earned 280 total points
ID: 1419429
1. hwnd is invalid
2. hwnd is for a window that is hidden
3., hwnd is for a window is covered by other windows.
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by:nietod
ID: 1419430
4.  (Possibly, but unlikely to happen) if LockWindowUpdate() was called on  the window.  (If that was done, I'm not sure what would happen in this case, but it seems likely that you'd get 0.)
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