ValidateRect

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

BOOL ValidateRect( 
HWND hWnd, 
const RECT *lpRect
); 

Parameters

• hWnd
  Handle to the window whose update region is to be modified. If this parameter is NULL, the system invalidates and redraws all windows and sends the WM_ERASEBKGND message to the window procedure before the function returns.
• lpRect
  Long pointer 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

Nonzero indicates success. Zero indicates failure.

To get extended error information, call GetLastError.

Remarks

Passing in a NULL value for the hWnd parameter is not supported.

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.

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

Requirements

Note   This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.

See Also

BeginPaint, GetLastError, InvalidateRect, WM_ERASEBKGND, WM_PAINT, RECT

 Last updated on Tuesday, July 13, 2004

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