SelectClipRgn info Overview Group

The SelectClipRgn function selects a region as the current clipping region for the specified device context.

int SelectClipRgn(

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

Parameters

The return value specifies the region’s complexity and can be any one of the following values:

Value	Meaning
NULLREGION	Region is empty.
SIMPLEREGION	Region is a single rectangle.
COMPLEXREGION	Region is more than one rectangle.
ERROR	An error occurred. (The previous clipping region is unaffected.)

To get extended error information, call GetLastError.

Only a copy of the selected region is used. The region itself can be selected for any number of other device contexts or it can be deleted.

The SelectClipRgn function assumes that the coordinates for a region are specified in device units.

To remove a device-context’s clipping region, specify a NULL region handle.