Question

我创建了TCP服务器。它从客户端获取消息，我想发送回响应："test meesage"。我想这次我必须使用TCPClient课，但我不确定，我不知道为什么。我已经有他们之间的联系，也许我可以重用它？我在代码中标记为注释位置，我想将消息发回。

如何将邮件发送回客户端？（在代码底部标记为注释）

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

namespace HomeSecurity {
    class TCPEventServer {
        private TcpListener tcpListener;
        private Thread listenThread;
        public static readonly string SWITCH = "SWITCH";
        public TCPEventServer() {
            this.tcpListener = new TcpListener(IPAddress.Any, 13000);
            this.listenThread = new Thread(new ThreadStart(ListenForClients));
            this.listenThread.Start();
        }
        private void ListenForClients() {
            this.tcpListener.Start();
            while (true) {
                TcpClient client = this.tcpListener.AcceptTcpClient();
                 System.Media.SoundPlayer notificationPlayer = new System.Media.SoundPlayer("beep.wav");
                 notificationPlayer.Play();
                 System.Diagnostics.Debug.WriteLine("przyszlo cos");
                Thread clientThread = new Thread(new ParameterizedThreadStart(HandleClientComm));
                clientThread.Start(client);
            }
        }
        private void HandleClientComm(object client) {
            TcpClient tcpClient = (TcpClient)client;
            NetworkStream clientStream = tcpClient.GetStream();
            byte[] message = new byte[4096];
            int bytesRead;
            System.Diagnostics.Debug.WriteLine("przyszlo cos");
            while (true) {
                bytesRead = 0;
                try {
                    bytesRead = clientStream.Read(message, 0, 4096);
                    System.Diagnostics.Debug.WriteLine("przyszlo cos");

                } catch {
                    break;
                }
                if (bytesRead == 0) {
                    break;
                }
                //wiadomość została pomyślnie odczytana
                ASCIIEncoding encoder = new ASCIIEncoding();
                string messageDecoded = encoder.GetString(message, 0, bytesRead);
                messageDecoded = messageDecoded.Replace("\r", string.Empty).Replace("\n", string.Empty);
                string ip = ((IPEndPoint)tcpClient.Client.RemoteEndPoint).Address + "";
                Console.WriteLine("message: " + messageDecoded + " ip: " + ip);

                if (messageDecoded.Split(' ')[0].Equals(SWITCH)) {
                    //przeprowadzenie autoryzacji
                    string login = messageDecoded.Split(' ')[1];
                    string password = messageDecoded.Split(' ')[2];
                    if (authorized(login, password)) {
                        VideoStream.SECURED = !VideoStream.SECURED;
                        System.Diagnostics.Debug.WriteLine("System secured: " + VideoStream.SECURED);
                        sendResponse();
                        //I WOULD LIKE TO SEND MESSAGE BACK TO THE CLIENT HERE
                    }
                } else {
                    VideoStream.PassMessage(messageDecoded, ip);
                }
            }
            tcpClient.Close();
        }

        private void sendResponse() {

        }


        private bool authorized(string login, string password) {
            return true;
        }


    }
}

Answer 1

您需要将clientStream更改为成员变量：

private NetworkStream _clientStream ;

private void HandleClientComm(object client) {
    TcpClient tcpClient = (TcpClient)client;
    _clientStream = tcpClient.GetStream();
   ...
}

然后，使用流来编写数据：

private void sendResponse() 
{
    var buffer = Encoding.ASCII.GetBytes("Hello!");
    _clientStream.Write(buffer, 0, buffer.Length); 
}

如何响应传入消息到TCPListener我可以重用现有连接吗？

1 个答案: