求教，socket的应答

Question

作为服务器端测试程序，已经接收到客户端发来的数据，接收到数据之后需要向客户端做一个握手应答也就是发个确认过去，
刚测试了下，客户端的程序没显示应答内容，不知道错在哪里了，请帮忙，谢谢！
        public static string message = "ABC&";
        public static string response = "";
        private bool isListening = false;
        private Socket socket;
        private string text;
        private string _text = "";
        private string msg = "";       private void Listen()
        {            IPAddress localAddr = Dns.Resolve(Dns.GetHostName()).AddressList[0];
            Int32 port = 11000;
            TcpListener tcpListener = new TcpListener(localAddr, port);
            //开始侦听
            tcpListener.Start();
            try
            {                 //返回可以用以处理连接的Socket实例                  Socket socketForClient = tcpListener.AcceptSocket();                //如果返回值是"true"，则产生的套节字已经接受来自远方的连接请求 
                if (socketForClient.Connected)
                {                    while (true)
                    {
                        //创建networkStream对象通过网络套节字来接受和发送数据 
                        NetworkStream ns = new NetworkStream(socketForClient);                        //从当前数据流中读取一行字符，返回值是字符串 
                        StreamReader sr = new StreamReader(ns);
                        msg = sr.ReadLine();
                        sr.Close();                       
                       
                                               /*向客户端回发数据开始*/                        //将响应信息以字节的方式发送到客户端  握手应答，也就是发个确认，起始字节0x7E也就是符号~,消息标识0x80也就是符号€,消息体长度4bytes。
                        //string _back = "7E80";
                        //socketForClient.Send(Encoding.UTF8.GetBytes(Convert.ToByte(_back, 16)));                        string _back = "~€";
                        socketForClient.Send(Encoding.UTF8.GetBytes(_back));
                        /*向客户端回发数据结束*/
                    }
                    
                }                socketForClient.Shutdown(SocketShutdown.Both);/*关闭连接*/
                socketForClient.Close();//释放资源            }
            catch (Exception ey)
            {
                MessageBox.Show(ey.ToString());
            }
            finally
            {
                tcpListener.Stop();            }
      }

Answer 1

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net.Sockets;
using System.IO;
using System.Threading;
using System.Net; namespace SocketFive
{
    public partial class SocketFive : Form
    {
        public SocketFive()
        {
            InitializeComponent();
        }
        public static string message = "ABC&";
        public static string response = "";
        private bool isListening = false;
        private Socket socket;
        private string text;
        private string _text = "";
        private string msg = "";
        private void Listen()
        {
                       //IPAddress localAddr = IPAddress.Parse("192.168.0.205");
            IPAddress localAddr = Dns.Resolve(Dns.GetHostName()).AddressList[0];
            Int32 port = 11000;
            TcpListener tcpListener = new TcpListener(localAddr, port);
            //开始侦听
            tcpListener.Start();
            //返回可以用以处理连接的Socket实例  
            //Socket socketForClient = tcpListener.AcceptSocket();
            try
            {
                Socket socketForClient = tcpListener.AcceptSocket();                //如果返回值是"true"，则产生的套节字已经接受来自远方的连接请求 
                if (socketForClient.Connected)
                {                    while (true)
                    {
                        //创建networkStream对象通过网络套节字来接受和发送数据 
                        NetworkStream ns = new NetworkStream(socketForClient);                        //从当前数据流中读取一行字符，返回值是字符串 
                        StreamReader sr = new StreamReader(ns);
                        msg = sr.ReadLine();
                        sr.Close();                        //message += msg+"&";
                        //MessageBox.Show(message);
                        //MessageBox.Show(msg);                        /*解析数据开始*/
                        byte[] buffer = new byte[1024];
                        if (msg != "")
                        {
                            for (int i = 0; i < msg.ToCharArray().Length; i++)
                            {
                                char[] _data = msg.ToCharArray();
                                buffer[i] = (byte)_data[i];
                                _text += buffer[i].ToString("X2") + "_join_";
                            }                            //MessageBox.Show(_text);                        }                        MessageBox.Show(_text);                        msg = "";
                        _text = "";                                                /*解析数据结束*/                        
                        /*向客户端回发数据开始*/                        //将响应信息以字节的方式发送到客户端  握手应答，也就是发个确认，起始字节0x7E也就是符号~,消息标识0x80也就是符号€,消息体长度4bytes。
                        //string _back = "7E80";
                        //socketForClient.Send(Encoding.UTF8.GetBytes(Convert.ToByte(_back, 16)));                        string _back = "~€";
                        socketForClient.Send(Encoding.UTF8.GetBytes(_back));
                        /*向客户端回发数据结束*/
                    }
                    //MessageBox.Show(message);                }                socketForClient.Shutdown(SocketShutdown.Both);/*关闭连接*/
                socketForClient.Close();//释放资源            }
            catch (Exception ey)
            {
                MessageBox.Show(ey.ToString());
            }
            finally
            {
                tcpListener.Stop();            }
        }        private void btnStart_Click(object sender, EventArgs e)
        {            isListening = true;
            Thread _thread = new Thread(new ThreadStart(Listen));
            _thread.Start();
           
        }
    }
}

Answer 2

你既然已经获得了NetworkStream类型的对象sr，发送返回信息就一句 sr.Write(....) 就可以了。

Answer 3

哦，这样啊，我以为用socket.send()向客户端回发确认信息呢

Answer 4

我试试啊，我之前找到的例子是收到message后，重新建一个socket。感觉不太好。