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 |
); |
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. |
BeginPaint, GetUpdateRect, GetUpdateRgn, UpdateWindow
file: /Techref/os/win/api/win32/func/src/f22_16.htm, 2KB, , updated: 2000/4/7 12:19, local time: 2025/5/1 10:02,
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