Question

我正在研究Tcp连接以在两台PC之间发送消息它在控制台应用程序案例中正常工作但在Windows窗体中，监听器停止监听它不会连续监听并抛出此异常。

例外：

Not listening. you must call the start() method before calling this method.

这是我的代码。

代码：

        public static  void TcpListener()
    {


            TcpListener server = null;
        try
        {


                // Set the TcpListener on port 13000.
                Int32 port = 8888;
            IPAddress localAddr = IPAddress.Parse(Getlocalip());

            // TcpListener server = new TcpListener(port);
            server = new TcpListener(localAddr, port);

            // Start listening for client requests.
            server.Start();

            // Buffer for reading data
            Byte[] bytes = new Byte[256];
            String data = null;

            // Enter the listening loop.


            Thread t = new Thread(() =>
            {
                while (true)
                {
                    MessageBox.Show("Waiting for a connection... ");

                    // Perform a blocking call to accept requests.
                    // You could also user server.AcceptSocket() here.
      TcpClient client = server.AcceptTcpClient();
                    MessageBox.Show("Server Connected!");

                    data = null;

                    // Get a stream object for reading and writing
                    NetworkStream stream = client.GetStream();

                    int i;

                    // Loop to receive all the data sent by the client.
                    while ((i = stream.Read(bytes, 0, bytes.Length)) != 0)
                    {
                        // Translate data bytes to a ASCII string.
                        data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
                        // Console.WriteLine("Received: {0}", data);
                        if (data == "pbrush")
                        {
                            Runprocess("start " + data);

                            byte[] msg = System.Text.Encoding.ASCII.GetBytes(data + " opened successfully");

                            // Send back a response.
                            stream.Write(msg, 0, msg.Length);

                        }
                        if (data == "calc")
                        {
                            Runprocess("start " + data);

                            byte[] msg = System.Text.Encoding.ASCII.GetBytes(data + " opened successfully");

                            // Send back a response.
                            stream.Write(msg, 0, msg.Length);
                        }

                        if (data.ToString() == "getmac")
                        {
                            string result = Runprocess(data, true);

                            byte[] msg = System.Text.Encoding.ASCII.GetBytes(result);

                            // Send back a response.
                            stream.Write(msg, 0, msg.Length);
                        }

                        if (data.ToString() == "tree d:")
                        {
                            string result = Runprocess(data, true);

                            byte[] msg = System.Text.Encoding.ASCII.GetBytes(result);

                            // Send back a response.
                            stream.Write(msg, 0, msg.Length);
                        }



                        if (data.ToString() == "ipconfig")
                        {
                            string result = Runprocess(data, true);

                            byte[] msg = System.Text.Encoding.ASCII.GetBytes(result);

                            // Send back a response.
                            stream.Write(msg, 0, msg.Length);
                        }
                        if (data.ToString() == "facebook")
                        {
                            Runprocess("start " + data);

                            byte[] msg = System.Text.Encoding.ASCII.GetBytes(data + " opened successfully");

                            // Send back a response.
                            stream.Write(msg, 0, msg.Length);
                        }
                        // Process the data sent by the client.
                        data = data.ToUpper();

                        Console.WriteLine("Sent");
                    }

                    // Shutdown and end connection
                    client.Close();
                }

            });
            t.IsBackground = true;
            t.Start();

        }
        catch (SocketException e)
        {
            Console.WriteLine("SocketException: {0}", e);
        }
        finally
        {
            // Stop listening for new clients.
            server.Stop();
        }


        Console.WriteLine("\nHit enter to continue...");
        Console.Read();








    }

Answer 1

您的问题非常简单 - 您正在调用finally块中的server.Stop()。因为在try块中你只是启动一个线程，它会立即跳转到finally块。

您确实在等待控制台中的密钥，但是在您停止服务器之后就已经这样了。

所以，首先你应该在线程中添加一个try-catch块，因为目前你不会捕获那里发生的任何异常。

其次，在Console.Read()之前移动server.Stop()。

TCP侦听器停止在Windows窗体中侦听

1 个答案: