Two way C++ to C# communication using named pipes

Question

I am trying to have a 2-way communication between a VC++ 6 app and a C# app. I am using named pipes. In my C++ code I can read the message from the C# client but then the se

Answer 1

Disposing of a StreamWriter or StreamReader will close the underlying stream.

Your using statements therefore will be causing the stream to close.

    public void ThreadStartClient(object obj)
    {
            // Ensure that we only start the client after the server has created the pipe
            ManualResetEvent SyncClientServer = (ManualResetEvent)obj;

            // Only continue after the server was created -- otherwise we just fail badly
            // SyncClientServer.WaitOne();

            using (NamedPipeClientStream pipeStream = new NamedPipeClientStream(".", "SAPipe"))
            {
                // The connect function will indefinately wait for the pipe to become available
                // If that is not acceptable specify a maximum waiting time (in ms)
                pipeStream.Connect();


                //Write from client to server
                StreamWriter sw = new StreamWriter(pipeStream))
                sw.WriteLine("What's your status?");

                //Read server reply
                StreamReader sr = new StreamReader(pipeStream)
                string temp = "";
                temp = sr.ReadLine();   //Pipe is already closed here ... why?

                MessageBox.Show(temp);
            }
    }

It should also be noted that because you wrap your stream in a using statement, the commented out pipeStream.Close() function isn't needed.