如何从umnanaged到托管代码空间发送命名管道字符串？

Question

我似乎有一个命名管道101问题.我有一个非常简单的设置来连接从C++非托管应用程序传输到C#托管应用程序的单工命名管道.管道连接,但我不能通过管道发送"消息",除非我关闭看起来冲洗缓冲区并传递消息的句柄.就像消息被阻止一样.我试过反转客户端/服务器的角色,并使用不同的标志组合调用它们,没有任何运气.我可以轻松地从C#托管到C++非托管的另一个方向发送消息.有没有人有任何见解.你们中的任何人都可以成功地将C++中的消息发送到C#managed吗？我可以找到许多内部管理或非管理管道的例子,但不能管理到非管理的管道 - 只是声称能够做到这一点.

在清单中,为了清楚起见,我省略了很多包装材料.我认为相关的关键位是管道连接/创建/读取和写入方法.这里不要过分担心阻塞/线程.

C#服务器端

    // This runs in its own thread and so it is OK to block
    private void ConnectToClient()
    {
        // This server will listen to the sending client
        if (m_InPipeStream == null)
        {
            m_InPipeStream =
                new NamedPipeServerStream("TestPipe", PipeDirection.In, 1);
        }

        // Wait for client to connect to our server
        m_InPipeStream.WaitForConnection();

        // Verify client is running
        if (!m_InPipeStream.IsConnected)
        {
            return;
        }

        // Start listening for messages on the client stream
        if (m_InPipeStream != null && m_InPipeStream.CanRead)
        {
            ReadThread = new Thread(new ParameterizedThreadStart(Read));
            ReadThread.Start(m_InPipeStream);
        }
    }


    // This runs in its own thread and so it is OK to block
    private void Read(object serverObj)
    {
        NamedPipeServerStream pipeStream = (NamedPipeServerStream)serverObj;
        using (StreamReader sr = new StreamReader(pipeStream))
        {
            while (true)
            {
                string buffer = "" ;
                try
                {
                    // Blocks here until the handle is closed by the client-side!!
                    buffer = sr.ReadLine();   // <<<<<<<<<<<<<<  Sticks here
                }
                catch
                {
                    // Read error
                    break;
                }

                // Client has disconnected?
                if (buffer == null || buffer.Length == 0)
                    break;

                // Fire message received event if message is non-empty
                if (MessageReceived != null && buffer != "")
                {
                    MessageReceived(buffer);
                }
            }
        }
    }

C++客户端

    // Static - running in its own thread.
    DWORD CNamedPipe::ListenForServer(LPVOID arg)
    {
        // The calling app (this) is passed as the parameter
        CNamedPipe* app = (CNamedPipe*)arg;

        // Out-Pipe: connect as a client to a waiting server
        app->m_hOutPipeHandle =
        CreateFile("\\\\.\\pipe\\TestPipe",
               GENERIC_WRITE,
               0,
               NULL,
               OPEN_EXISTING,
               FILE_ATTRIBUTE_NORMAL,
               NULL);
        // Could not create handle
        if (app->m_hInPipeHandle == NULL ||
            app->m_hInPipeHandle == INVALID_HANDLE_VALUE)
        {
            return 1;
        }

        return 0;
    }


    // Sends a message to the server
    BOOL CNamedPipe::SendMessage(CString message)
    {
    DWORD dwSent;

        if (m_hOutPipeHandle == NULL ||
            m_hOutPipeHandle == INVALID_HANDLE_VALUE)
        {
            return FALSE;
        }
        else
        {
            BOOL bOK =
                WriteFile(m_hOutPipeHandle,
                          message, message.GetLength()+1, &dwSent, NULL);
            //FlushFileBuffers(m_hOutPipeHandle);             // <<<<<<< Tried this
            return (!bOK || (message.GetLength()+1) != dwSent) ? FALSE : TRUE;
        }
    }


    // Somewhere in the Windows C++/MFC code...
    ...
    // This write is non-blocking. It just passes through having loaded the pipe.
    m_pNamedPipe->SendMessage("Hi de hi");
    ...

Answer 1

sr.ReadLine()希望看到一个换行符来知道该行的结尾.因为它既不接收新行也不接收流,它等待更多.尝试:

m_pNamedPipe->SendMessage("Hi de hi\n")

或者一些sr.Read()方法.