# File lib/windows/error.rb, line 333
      def get_last_error(err_num = GetLastError.call)
         buf   = 0.chr * 260
         flags = FORMAT_MESSAGE_FROM_SYSTEM + FORMAT_MESSAGE_ARGUMENT_ARRAY        
         FormatMessage.call(flags, 0, err_num, 0, buf, buf.size, 0)
         buf.split(0.chr).first.chomp rescue 'Unknown error'       
      end