Thanks so much Christian!

>Hello Tracy,
>
>see inline comments.
>
>

>sizeof = REPLICATE(' ',2048)+CHR(0)
>i = 1
>nInfo = REPLICATE(' ',2048)+CHR(0)
>PSP_DEVINFO_DATA = []
>
>lnpointer = 0
>DO WHILE .T.
>	lnpointer =  SetupDiGetClassDevs(@cGuid,null,0,DIGCF_INTERFACEDEVICE)
>	IF TYPE('lnpointer') = "N" .and. lnpointer > 0
>		lldestroy = .t.
>		? '        Handle to Device Set: '
>		?? ALLTRIM(STR(lnpointer))
>		DeviceInfoSet = lnpointer
>
>		i = 0 && first interface is retrieved by passing 0
>                LOCAL lcInterfaceData
>
>                DO WHILE .T.
>                    && setup a SP_DEVICE_INTERFACE_DATA structure,
>                    && BINTOC sets dwSize member to 28, + SPACE(24) for the
>                    && rest of the structure
>                    lcInterfaceData = BINTOC(28,'RS') + SPACE(24)
>
>		IF !SetupDiEnumDeviceInterfaces(DeviceInfoSet,
>                        @nInfo , @cGuid, i, @lcInterfaceData)
>
>
>             		IF GetLastError() = ERROR_NO_MORE_ITEMS
>           	         	EXIT
>                 	ELSE
>	                	EXIT
>                        ENDIF
>
>                ELSE
>
>                   &&& extract the interface data here ... (CTOBIN, SUBSTR)
>
>                   && increment i for next interface
>                   i = i + 1
>	       ENDIF
>
>               ENDDO
>
>	ENDIF
>ENDDO
>
>....
>....
>

>
>the value returned from SetupDiGetClassDevs is a HANDLE, just like a HWND (window handle). It's not an array, its just a single 32bit value you pass on plain to other functions.
>
>Regards
>Christian