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GetUpdateRgn info  Overview  Group

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



Identifies the window with an update region that is to be retrieved.
Identifies the region to receive the update region.
Specifies whether the window background should be erased and whether nonclient areas of child windows should be drawn. If this parameter is FALSE, no drawing is done.

Return Values

The return value indicates the complexity of the resulting region; it can be one of the following values:




Region consists of more than one rectangle.


An error occurred.


Region is empty.


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.

See Also

GetUpdateRect, InvalidateRgn, UpdateWindow, ValidateRgn

file: /Techref/os/win/api/win32/func/src/f42_1.htm, 3KB, , updated: 2000/4/7 12:19, local time: 2024/6/22 14:40,

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