The GetUpdateRgn function retrieves the update region of a window by copying it into the specified region. The coordinates of the update region are relative to the upper-left corner of the window (that is, they are client coordinates).
int GetUpdateRgn(
HWND hWnd, |
// handle of window |
HRGN hRgn, |
// handle of region |
BOOL bErase |
// erase background flag |
); |
The return value indicates the complexity of the resulting region; it can be 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. |
The BeginPaint function automatically validates the update region, so any call to GetUpdateRgn made immediately after the call to BeginPaint retrieves an empty update region.
GetUpdateRect, InvalidateRgn, UpdateWindow, ValidateRgn
file: /Techref/os/win/api/win32/func/src/f42_1.htm, 3KB, , updated: 2000/4/7 12:19, local time: 2024/9/1 05:25,
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