CDC::ExcludeUpdateRgn

Syntax

int ExcludeUpdateRgn( CWnd* pWnd );

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.

Return Value

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

Value

Meaning

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

See Also

::ExcludeUpdateRgn