CDC::ExcludeUpdateRgn

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.

int ExcludeUpdateRgn(
   CWnd* pWnd 
);

Parameters

• pWnd
  Points to the window object whose window is being updated.

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.

Requirements

Header: afxwin.h

See Also

Concepts

CDC Class

CDC Members

Hierarchy Chart

CDC::ExcludeClipRect

ExcludeUpdateRgn