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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| user32.lib
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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ValidateRect
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
| );
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Parameters
hWnd
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.
lpRect
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.
Remarks
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
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