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ValidateRect info  Overview  Group

The ValidateRect function validates the client area within a rectangle by removing the rectangle from the update region of the specified window.

BOOL ValidateRect(

    HWND hWnd,

// handle of window

    CONST RECT *lpRect

// address of validation rectangle coordinates



Identifies the window whose update region is to be modified. If this parameter is NULL, Windows invalidates and redraws all windows and sends the WM_ERASEBKGND and WM_NCPAINT messages to the window procedure before the function returns.
Points to a RECT structure that contains the client coordinates of the rectangle to be removed from the update region. If this parameter is NULL, the entire client area is removed.

Return Values

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 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.

Windows continues to generate WM_PAINT messages until the current update region is validated.

See Also

BeginPaint, InvalidateRect, InvalidateRgn, RECT, ValidateRgn, WM_PAINT

file: /Techref/os/win/api/win32/func/src/f90_2.htm, 2KB, , updated: 2000/4/7 12:19, local time: 2024/7/23 19:00,

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