# File lib/net/ssh/authentication/pageant.rb, line 111
      def send_query(query)
        res = nil
        filemap = 0
        ptr = nil
        id = DL::PtrData.malloc(DL.sizeof("L"))

        mapname = "PageantRequest%08x\000" % Win.getCurrentThreadId()
        filemap = Win.createFileMapping(Win::INVALID_HANDLE_VALUE, 
                                        Win::NULL,
                                        Win::PAGE_READWRITE, 0, 
                                        AGENT_MAX_MSGLEN, mapname)
        if filemap == 0
          raise Net::SSH::Exception,
            "Creation of file mapping failed"
        end

        ptr = Win.mapViewOfFile(filemap, Win::FILE_MAP_WRITE, 0, 0, 
                                AGENT_MAX_MSGLEN)

        if ptr.nil? || ptr.null?
          raise Net::SSH::Exception, "Mapping of file failed"
        end

        ptr[0] = query
        
        cds = [AGENT_COPYDATA_ID, mapname.size + 1, mapname].
          pack("LLp").to_ptr
        succ = Win.sendMessageTimeout(@win, Win::WM_COPYDATA, Win::NULL,
          cds, Win::SMTO_NORMAL, 5000, id)

        if succ > 0
          retlen = 4 + ptr.to_s(4).unpack("N")[0]
          res = ptr.to_s(retlen)
        end        

        return res
      ensure
        Win.unmapViewOfFile(ptr) unless ptr.nil? || ptr.null?
        Win.closeHandle(filemap) if filemap != 0
      end