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ValidateRgn function

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

Syntax


BOOL ValidateRgn(
  _In_  HWND hWnd,
  _In_  HRGN hRgn
);

Parameters

hWnd [in]

Handle to the window whose update region is to be modified.

hRgn [in]

Handle to a region that defines the area to be removed from the update region. If this parameter is NULL, the entire client area is removed.

Return value

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero.

Remarks

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.

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Winuser.h (include Windows.h)

Library

User32.lib

DLL

User32.dll

See also

Painting and Drawing Overview
Painting and Drawing Functions
BeginPaint
ExcludeUpdateRgn
InvalidateRect
InvalidateRgn
ValidateRect
WM_PAINT

 

 

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