CDC::ExcludeUpdateRgn 

int ExcludeUpdateRgn( CWnd* pWnd );

Return Value

The type of excluded region. It can be any one of the following values:

• COMPLEXREGION   The region has overlapping borders.
  
  
• ERROR   No region was created.
  
  
• NULLREGION   The region is empty.
  
  
• SIMPLEREGION   The region has no overlapping borders.

Parameters

pWnd

Points to the window object whose window is being updated.

Remarks

Prevents drawing within invalid areas of a window by excluding an updated region in the window from the clipping region associated with the CDC object.

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See Also   CDC::ExcludeClipRect, ::ExcludeUpdateRgn