CDC::ExcludeUpdateRgn 

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intExcludeUpdateRgn(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,