ValidateRgn
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 |
|
); |
|
Parameters
hWnd
Identifies
the window whose update region is to be modified.
hRgn
Identifies 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 Values
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.
See Also