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ExcludeUpdateRgn info  Overview  Group

The ExcludeUpdateRgn function prevents drawing within invalid areas of a window by excluding an updated region in the window from a clipping region.

int ExcludeUpdateRgn(

    HDC hDC,

// handle to device context

    HWND hWnd 

// handle to window

   );

Parameters

hDC
Identifies the device context associated with the clipping region.
hWnd
Identifies the window to update.

Return Values

The return value specifies the complexity of the excluded region; it can be any one of the following values:

Value

Meaning

COMPLEXREGION

Region consists of more than one rectangle.

ERROR

An error occurred.

NULLREGION

Region is empty.

SIMPLEREGION

Region is a single rectangle.

See Also

BeginPaint, GetUpdateRect, GetUpdateRgn, UpdateWindow

file: /Techref/os/win/api/win32/func/src/f22_16.htm, 2KB, , updated: 2000/4/7 12:19, local time: 2025/5/25 05:56,
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