C# Winform 实现TCP发消息

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;
 
namespace SocketStudy
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 负责通信的socket
        /// </summary>
        Socket socketSend;
 
        /// <summary>
        /// 负责监听Socket
        /// </summary>
        Socket socket;
 
        /// <summary>
        /// 存放连接的socket
        /// </summary>
        Dictionary<string, Socket> dictionary = new Dictionary<string, Socket>();
 
        /// <summary>
        /// 开始监听
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            //创建监听的socket,
            //SocketType.Stream 流式对应tcp协议
            //Dgram,数据报对应UDP协议
            socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            //创建IP地址和端口号
            IPAddress ip = IPAddress.Any;//IPAddress.Parse(textServerIP.Text);
            int port = Convert.ToInt32(textServerPort.Text);
            IPEndPoint iPEndPoint = new IPEndPoint(ip, port);
 
            //让负责监听的Socket绑定ip和端口号
            socket.Bind(iPEndPoint);
 
            ShowLog("监听成功！" + ip + "\t" + port);//打印日志
 
            //设置监听队列
            socket.Listen(10);//一段时间内可以连接到的服务器的最大数量
            Thread thread = new Thread(Listen);
            thread.IsBackground = true;
            thread.Start(socket);
        }
 
        /// <summary>
        /// 使用线程来接收数据
        /// </summary>
        /// <param name="o"></param>
        private void Listen(object o)
        {
            Socket socket = o as Socket;
            while(true){
                //负责监听的socket是用来接收客户端连接
                //创建负责通信的socket
                socketSend = socket.Accept();
                dictionary.Add(socketSend.RemoteEndPoint.ToString(), socketSend);
                clientCombo.Items.Add(socketSend.RemoteEndPoint.ToString());
 
                ShowLog(socketSend.RemoteEndPoint.ToString() + "已连接");
 
                //开启新线程，接收客户端发来的信息
                Thread th = new Thread(receive);
                th.IsBackground = true;
                th.Start(socketSend);
            }
        }
 
        //服务器接收客户端传来的消息
        private void receive(object o)
        {
            Socket socketSend = o as Socket;
            while (true)
            {
                try
                {
                    //客户端连接成功后，服务器接收客户端发来的消息
                    byte[] buffer = new byte[1024 * 1024 * 2];//2M大小
                                                              //接收到的有效字节数
                    int length = socketSend.Receive(buffer);
                    if (length == 0)
                    {
                        ShowLog(socketSend.RemoteEndPoint.ToString() + "下线了。");
                        dictionary[socketSend.RemoteEndPoint.ToString()].Shutdown(SocketShutdown.Both);
                        dictionary[socketSend.RemoteEndPoint.ToString()].Disconnect(false);
                        dictionary[socketSend.RemoteEndPoint.ToString()].Close();
                        break;
                    }
                    string str = Encoding.ASCII.GetString(buffer, 0, length);
                    ShowLog(socketSend.RemoteEndPoint.ToString() + "\n\t" + str);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
            }
        }
 
        /// <summary>
        /// 日志打印
        /// </summary>
        /// <param name="str"></param>
        private void ShowLog(string str)
        {
            textLog.AppendText(str + "\r\n");
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            //取消对跨线程调用而产生的错误
            Control.CheckForIllegalCrossThreadCalls = false;
        }
 
        private void sendMsgBtn_Click(object sender, EventArgs e)
        {
            string txt = textMsg.Text;
            byte[] buffer = Encoding.UTF8.GetBytes(txt);
            List<byte> list = new List<byte>();
            list.Add(0); // 0 为 发消息
            list.AddRange(buffer);
            byte[] newBuffer = list.ToArray();
            //socketSend.Send(buffer);
            string ip = clientCombo.SelectedItem.ToString();//获取选中的ip地址
            Socket socketsend=dictionary[ip];
            socketsend.Send(newBuffer);
        }
 
        private void selectBtn_Click(object sender, EventArgs e)
        {
            OpenFileDialog fileDialog = new OpenFileDialog();
            fileDialog.InitialDirectory=@"D:";
            fileDialog.Title="选择文件";
            fileDialog.Filter = "所有文件|*.*";
            fileDialog.ShowDialog();
 
            pathTxt.Text = fileDialog.FileName;
 
        }
 
        /// <summary>
        /// 发文件，
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void sendFileBtn_Click(object sender, EventArgs e)
        {
            string path = pathTxt.Text;
            FileStream fileStream = new FileStream(path,FileMode.Open,FileAccess.Read);
 
            byte[] buffer = new byte[1024*1024*3];
            buffer[0] = 1;// 1 为发文件的标志位
            int length = fileStream.Read(buffer, 1, buffer.Length-1);
            fileStream.Close();
            string ip = clientCombo.SelectedItem.ToString();//获取选中的ip地址
            Socket socketsend = dictionary[ip];
            socketsend.Send(buffer,0, length+1, SocketFlags.None);
        }
 
        /// <summary>
        /// 抖一抖
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void shockBtn_Click(object sender, EventArgs e)
        {
            byte[] buffer = new byte[1];
            buffer[0] = 2;// 2 为抖一抖
            string ip = clientCombo.SelectedItem.ToString();//获取选中的ip地址
            Socket socketsend = dictionary[ip];
            socketsend.Send(buffer);
        }
 
        /// <summary>
        /// 关闭前关闭socket
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            try
            {
                socket.Shutdown(SocketShutdown.Both);
                socket.Disconnect(false);
                socket.Close();
            }
            catch
            {
                socket.Close();
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace Client
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        Socket socket;<br>　　　　　　//连接
        private void connectBtn_Click(object sender, EventArgs e)
        {
            try
            {
                //创建负责通信的socket
                socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                //地址、端口
                IPAddress ip = IPAddress.Parse(ipText.Text);
                int serverPort = Convert.ToInt32(portText.Text);
                IPEndPoint port = new IPEndPoint(ip, serverPort);
                //连接到服务器
                socket.Connect(port);
                ShowLog("已连接");
 
                //启动接收数据线程
                Thread th = new Thread(receive);
                th.IsBackground = true;
                th.Start();
            }
            catch { }
        }<br>　　　　//日志
        private void ShowLog(string str)
        {
            textLog.AppendText(str + "\r\n");
        }
 
        /// <summary>
        /// 发消息
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void sendMsgBtn_Click(object sender, EventArgs e)
        {
            try
            {
                string txt = sendMsg.Text;
                byte[] buffer = Encoding.ASCII.GetBytes(txt);//ascii编码
                socket.Send(buffer);
            }
            catch { }
        }
　　　　<br>　　　　//接收消息<br>
        private void receive()
        {
            while (true)
            {
                try
                {
                    byte[] buffer = new byte[1024 * 1024 * 2];
                    int length = socket.Receive(buffer);
                    if (length == 0)
                    {
                        break;
                    }
                    if (buffer[0] == 0)
                    {
                        string txt = Encoding.UTF8.GetString(buffer, 1, length-1);
                        ShowLog(socket.RemoteEndPoint + ":\r\t" + txt);
                    }else if (buffer[0] == 1)
                    {
                        SaveFileDialog saveFileDialog = new SaveFileDialog();
                        saveFileDialog.InitialDirectory = @"E:\";
                        saveFileDialog.Title = "饿了吃什么";
                        saveFileDialog.Filter = "所有文件 | *.*";
                        saveFileDialog.ShowDialog(this);
 
                        string path = saveFileDialog.FileName;
                        FileStream fileStreamWrite = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write);
                        fileStreamWrite.Write(buffer,1,length-1);
                        fileStreamWrite.Close();
                        MessageBox.Show("保存成功");
                    }else if (buffer[0] == 2)
                    {
                        ZD();
                    }
                }
                catch { }
            }
        }
　　　　　　//震动
        private void ZD()
        {
            for(int i=0;i<20;i++){
                if (i%2==0)
                {
                    this.Location = new System.Drawing.Point(500, 500);
                }
                else
                {
                    this.Location = new System.Drawing.Point(530, 530);
                }
                Thread.Sleep(20);
            }
        }
　　　　//取消跨线程检查
        private void Form1_Load(object sender, EventArgs e)
        {
            Control.CheckForIllegalCrossThreadCalls = false;
        }
　　　　//关闭前关掉socket
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            socket.Disconnect(false);
            socket.Close();
        }
　　　　　　//断开连接
        private void button1_Click(object sender, EventArgs e)
        {
            if (socket !=null)
            {
                socket.Disconnect(false);
            }
        }
    }
}