Selects the current path as a clipping region, combining the new region with any existing clipping region
#include <WinAPIGdi.au3>
_WinAPI_SelectClipPath ( $hDC [, $iMode = $RGN_COPY] )
| $hDC | Handle to the device context of the path. |
| $iMode | [optional] The way to use the path. This parameter can be one of the following values. $RGN_AND $RGN_COPY (Default) $RGN_DIFF $RGN_OR $RGN_XOR |
| Success: | True. |
| Failure: | False, call _WinAPI_GetLastError() to get extended error information. |
Search SelectClipPath in MSDN Library.