USBACCESS_API CUSBaccess * _stdcall FCWInitObject(void) ; USBACCESS_API void _stdcall FCWUnInitObject(CUSBaccess *obj) ; USBACCESS_API int _stdcall FCWOpenCleware(CUSBaccess *obj) ; USBACCESS_API int _stdcall FCWCloseCleware(CUSBaccess *obj) ; #### #!usr/bin/perl use Win32::API; my $function1=Win32::API->Import( 'D:\Cleware\USBaccess.dll', 'int FCWInitObject()', ); my $return = $function1; Print($return);