use Win32::API;
  $function = new Win32::API($library, 
                             $functionname, 
                             \@argumenttypes, 
                             $returntype);
  $return = $function->Call(@arguments);

##</code><code>##

BOOL GetDiskFreeSpaceEx(
  LPCTSTR lpDirectoryName,  // pointer to the directory name
  PULARGE_INTEGER lpFreeBytesAvailableToCaller, // receives the number of bytes on
                                                // disk available to the caller
  PULARGE_INTEGER lpTotalNumberOfBytes,    // receives the number of bytes on disk
  PULARGE_INTEGER lpTotalNumberOfFreeBytes // receives the free bytes on disk
);