The GetUpdateRect function retrieves the coordinates of the smallest rectangle that completely encloses the update region of the specified window. If the window was created with the CS_OWNDC style and the mapping mode is not MM_TEXT, GetUpdateRect retrieves the rectangle in logical coordinates. Otherwise, it retrieves the rectangle in client coordinates. If there is no update region, GetUpdateRect retrieves an empty rectangle (sets all coordinates to zero).
BOOL GetUpdateRect(
HWND hWnd, |
// handle of window |
LPRECT lpRect, |
// address of update rectangle coordinates |
BOOL bErase |
// erase flag |
); |
An application can set this parameter to NULL to determine whether an update
region exists for the window. If this parameter is NULL, GetUpdateRect
returns nonzero if an update region exists, and zero if one does not. This
provides a simple and efficient means of determining whether a WM_PAINT
message resulted from an invalid area.
If the update region is not empty, the return value is nonzero.
If there is no update region, the return value is zero. To get extended error information, call GetLastError.
The update rectangle retrieved by the BeginPaint function is identical to that retrieved by GetUpdateRect.
BeginPaint automatically validates the update region, so any call to GetUpdateRect made immediately after the call to BeginPaint retrieves an empty update region.
BeginPaint, GetUpdateRgn, InvalidateRect, RECT, UpdateWindow, ValidateRect
file: /Techref/os/win/api/win32/func/src/f42.htm, 3KB, , updated: 2000/4/7 12:19, local time: 2024/9/1 05:37,
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