SelectClipRgn function (wingdi.h)

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

Syntax

int SelectClipRgn(
  [in] HDC  hdc,
  [in] HRGN hrgn
);

[in] hdc

A handle to the device context.

[in] hrgn

A handle to the region to be selected.

The return value specifies the region's complexity and can be one of the following values.

Return code	Description
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.)

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.

For an example, see Clipping Output.

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	wingdi.h (include Windows.h)
Library	Gdi32.lib
DLL	Gdi32.dll