GetClipRgn info  Overview  Group

The GetClipRgn function retrieves a handle identifying the current application-defined clipping region for the specified device context.

int GetClipRgn(

HDC hdc,	// handle of device context
HRGN hrgn	// handle of region
);

Parameters

hdc

Identifies the device context.

hrgn

Identifies an existing region before the function is called. After the function returns, this parameter identifies a copy of the current clipping region.

Return Values

If the function succeeds and there is no clipping region for the given device context, the return value is zero. If the function succeeds and there is a clipping region for the given device context, the return value is 1. If an error occurs, the return value is - 1. To get extended error information, call GetLastError.

Remarks

An application-defined clipping region is a clipping region identified by the SelectClipRgn function. It is not a clipping region created when the application calls the BeginPaint function.

If the function succeeds, the hrgn parameter identifies a copy of the current clipping region. Subsequent changes to this copy will not affect the current clipping region.

See Also

BeginPaint, SelectClipRgn

See: