The ValidateRgn function validates the client area within a region by removing the region from the current update region of the specified window.
BOOL ValidateRgn(
HWND hWnd, |
// handle of window |
HRGN hRgn |
// handle of valid region |
); |
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
The specified region must have been created by a region function. The region coordinates are assumed to be client coordinates.
The BeginPaint function automatically validates the entire client area. Neither the ValidateRect nor ValidateRgn function should be called if a portion of the update region must be validated before the next WM_PAINT message is generated.
BeginPaint, ExcludeUpdateRgn, InvalidateRect, InvalidateRgn, ValidateRect, WM_PAINT
file: /Techref/os/win/api/win32/func/src/f90_3.htm, 2KB, , updated: 2001/6/24 03:27, local time: 2024/8/23 08:40,
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