C# Socket TCP 编程,客户端与服务端连接,发送字符串,文件

做了个winform的Socket服务端和客户端,能实现发送消息&文字


以下是图片和一些关键点,最后是代码,注释不多



服务端

服务端创建一个socket对象

参数 :寻址方案,ip版本4 ;套接字类型,字节流 ;协议,TCP

Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

这时候可以在外边创建new一个空的socket对象比如serverSocket.来保存上面创建的对象,这样其他地方就能使用这个socket

例外,在外部创建一个List list 来保存连客户端socket对象.后面要用

socket需要ip地址和port,注意参数转换类型

socket.Bind(new IPEndPoint(IPAddress.Parse(txtIP.Text.ToString()), int.Parse(txtPort.Text)));

设置连接等待队列的数量

socket.Listen(10);

开始服务,等待客户端连接,这时候需要开另外一个线程 来做这些事情,AcceptClientConnect是自己写的一个方法,将socket传给它

ThreadPool.QueueUserWorkItem(new WaitCallback(this.AcceptClientConnect), socket);

下面是AcceptClientConnect的代码, 当有客户端连接时,创建一个Socket对象.变量名为proxSocket,并且保存到list中,方便以后使用,另外,需要在创建一个线程来处理该客户端socket发送过来的数据.

public void AcceptClientConnect(object socket)
        {
            var serverSocket = socket as Socket;
            this.AppendTextToTxtLog("服务器端开始接受客户端的链接");
            while (true)
            {
                try
                {
                    var proxSocket = serverSocket.Accept();
                    this.AppendTextToTxtLog(string.Format("客户端{0}连接上了", proxSocket.RemoteEndPoint.ToString()));
                    ClientProxClentList.Add(proxSocket);


                    //接受消息
                    ThreadPool.QueueUserWorkItem(new WaitCallback(this.ReceiveData), proxSocket);
                }
                catch (Exception)
                {
                }
                
            }
        }

其中AppendTextToTxtLog方法是给主窗口中传递文本信息,因为txtLog这个控件不是监听服务端连接的线程创建的.所以要用异步来让它把新消息复制到txtLog中,代码中if来判断是否是txtLog当前线程的控件

 public void AppendTextToTxtLog(string txt)
        {
            if (txtLog.InvokeRequired)
            {
                txtLog.BeginInvoke(new Action(s =>
                {
                    this.txtLog.Text = string.Format("{0}\r\n{1}", s, txtLog.Text);
                }), txt);
            }
            else
            {
                this.txtLog.Text = string.Format("{0}\r\n{1}", txt, txtLog.Text);
            }
        }
下面是处理客户端发送过来的数据的代码,new一个byte[]数组,变量名为data,代销为1024*1024,用来保存客户端发来的数据. int  readlen是实际接收到的数据的长度(data中没用的到部分会自动为null),服务端和客户端通信的时候,数据长度是大于0的.当数据长度等于0 的时候,说明客户端要断开连接,代码中有这个判断,还有try,catch捕获异常(这里处理的不怎么好),最后.当复合条件.发送过来的数据转换成字符串,这里用到了有效长度,截取,转换为字符串,添加到消息文本框中.

 public void ReceiveData(object obj)
        {
            Socket proxSocket = obj as Socket;
            byte[] data = new byte[1024 * 1024];
            while (true)
            {
                int readLen = 0;
                try
                {
                    readLen = proxSocket.Receive(data, 0, data.Length, SocketFlags.None);
                }
                catch (Exception ex)
                {
                    //异常退出时
                    AppendTextToTxtLog(string.Format("客户端{0}非正常退出", proxSocket.RemoteEndPoint.ToString()));
                    ClientProxClentList.Remove(proxSocket);
                    StopConnetct(proxSocket);
                    return;
                }
                if (readLen<=0)
                {
                    //客户端正常退出
                    AppendTextToTxtLog(string.Format("客户端:{0}正常退出", proxSocket.RemoteEndPoint.ToString()));
                    ClientProxClentList.Remove(proxSocket);
                    StopConnetct(proxSocket);
                    return;//方法结束->终结当前接受客户端数据的异步线程
                }
                string txt = Encoding.Default.GetString(data, 0, readLen);
                AppendTextToTxtLog(string.Format("接收到客户端{0}的消息{1}",proxSocket.RemoteEndPoint.ToString(),txt));
            }
        }
一下是发送消息的代码 ,这个客户端能发送字符串,文件和窗口晃动,在原本发送的byte[] data前面在增加一位,为1 的时候是发送字符串,2发送晃动.3发送文件,data数组前面加一位,new用一个新数组result,长度是data.length+1,之后用到了Buffer.BlockCopy()方法,参数分别是(原数组,原数组的开始位置,目标数组,目标数组的开始位置,原数组中取多长数据)

发送数据,客户端对象.Send(要发送的byte数组,开始位置,长度,发送接收行为),一般发送接收行为用SocketFlags.None就可以了.发送的时候遍历一下list中的客户端对象.判断一下是否连接.

 private void btnSend_Click(object sender, EventArgs e)
        {
            foreach (var proxSocket in ClientProxClentList)
            {
                if (proxSocket.Connected)
                {
                    //原始的字符串转换成的字节数组
                    byte[] data = Encoding.Default.GetBytes(txtSendMsg.Text);
                    //在头部加上标记字节
                    byte[] result = new byte[data.Length + 1];
                    //头部协议字节 1:代表字符串
                    result[0] = 1;
                    Buffer.BlockCopy(data, 0, result, 1, data.Length);
                    proxSocket.Send(result, 0, result.Length,SocketFlags.None);
                }
            }
        }
发送文件的方法,new一个新的byte数组,第一位设置为3,然后读取文件,转换为byte[]data,还是用Buffer.BlockCopy(),整合到变量名为result的byte数组中,遍历list中的客户端对象,如果是连接的,那么发送


private void button2_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog ofd =new OpenFileDialog())
            {
                if (ofd.ShowDialog()!=DialogResult.OK)
                {
                    return;
                }
                byte[] data = File.ReadAllBytes(ofd.FileName);
                byte[] result = new byte[data.Length + 1];
                result[0] = 3;
                Buffer.BlockCopy(data, 0, result, 1,data.Length);

                foreach (var proxSocket in ClientProxClentList)
                {
                    if (!proxSocket.Connected)
                    {
                        continue;
                    }
                    proxSocket.Send(result, SocketFlags.None);
                }
            }
           
        }
最后一个是晃动的,只要发一个第一位是2的byte数组过去就好

 private void button1_Click(object sender, EventArgs e)
        {
            foreach (var proxSocket in ClientProxClentList)
            {
                if (proxSocket.Connected)
                {
                    proxSocket.Send(new byte[] { 2 }, SocketFlags.None);
                }
            }
        }

下面是服务端的整体代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ChatDemo
{
    public partial class Mainfrm : Form
    {
        public Mainfrm()
        {
            InitializeComponent();
        }
        private Socket serverSocket;
        List ClientProxClentList = new List();
        private bool state = false;
        private void btnStart_Click(object sender, EventArgs e)
        {
            if (!state)
            {
                Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                serverSocket = socket;
                //ip port
                socket.Bind(new IPEndPoint(IPAddress.Parse(txtIP.Text.ToString()), int.Parse(txtPort.Text)));
                //listen
                socket.Listen(10);//连接等待队列
                ThreadPool.QueueUserWorkItem(new WaitCallback(this.AcceptClientConnect), socket);
                state = true;
                btnStart.Text = "停止服务";
            }
            else
            {
                try
                {
                    serverSocket.Close();
                    serverSocket.Shutdown(SocketShutdown.Both);
                }
                catch (Exception)
                {
                    state = false;
                    btnStart.Text = "开始服务";
                }
                
                
                

            }
            //对象
           
        }

        //日志文本框追加数据
        public void AppendTextToTxtLog(string txt)
        {
            if (txtLog.InvokeRequired)
            {
                txtLog.BeginInvoke(new Action(s =>
                {
                    this.txtLog.Text = string.Format("{0}\r\n{1}", s, txtLog.Text);
                }), txt);
            }
            else
            {
                this.txtLog.Text = string.Format("{0}\r\n{1}", txt, txtLog.Text);
            }
        }
        public void AcceptClientConnect(object socket)
        {
            var serverSocket = socket as Socket;
            this.AppendTextToTxtLog("服务器端开始接受客户端的链接");
            while (true)
            {
                try
                {
                    var proxSocket = serverSocket.Accept();
                    this.AppendTextToTxtLog(string.Format("客户端{0}连接上了", proxSocket.RemoteEndPoint.ToString()));
                    ClientProxClentList.Add(proxSocket);

                    //接受消息
                    ThreadPool.QueueUserWorkItem(new WaitCallback(this.ReceiveData), proxSocket);
                }
                catch (Exception)
                {
                }
                
            }
        }
        public void ReceiveData(object obj)
        {
            Socket proxSocket = obj as Socket;
            byte[] data = new byte[1024 * 1024];
            while (true)
            {
                int readLen = 0;
                try
                {
                    readLen = proxSocket.Receive(data, 0, data.Length, SocketFlags.None);
                }
                catch (Exception ex)
                {
                    //异常退出时
                    AppendTextToTxtLog(string.Format("客户端{0}非正常退出", proxSocket.RemoteEndPoint.ToString()));
                    ClientProxClentList.Remove(proxSocket);
                    StopConnetct(proxSocket);
                    return;
                }
                if (readLen<=0)
                {
                    //客户端正常退出
                    AppendTextToTxtLog(string.Format("客户端:{0}正常退出", proxSocket.RemoteEndPoint.ToString()));
                    ClientProxClentList.Remove(proxSocket);
                    StopConnetct(proxSocket);
                    return;//方法结束->终结当前接受客户端数据的异步线程
                }
                string txt = Encoding.Default.GetString(data, 0, readLen);
                AppendTextToTxtLog(string.Format("接收到客户端{0}的消息{1}",proxSocket.RemoteEndPoint.ToString(),txt));
            }
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            foreach (var proxSocket in ClientProxClentList)
            {
                if (proxSocket.Connected)
                {
                    //原始的字符串转换成的字节数组
                    byte[] data = Encoding.Default.GetBytes(txtSendMsg.Text);
                    //在头部加上标记字节
                    byte[] result = new byte[data.Length + 1];
                    //头部协议字节 1:代表字符串
                    result[0] = 1;
                    Buffer.BlockCopy(data, 0, result, 1, data.Length);
                    proxSocket.Send(result, 0, result.Length,SocketFlags.None);
                }
            }
        }

        private void StopConnetct(Socket proxSocket)
        {
            try
            {
                if (proxSocket.Connected)
                {
                    proxSocket.Shutdown(SocketShutdown.Both);
                    proxSocket.Close(100);
                }
            }
            catch (Exception ex)
            {
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog ofd =new OpenFileDialog())
            {
                if (ofd.ShowDialog()!=DialogResult.OK)
                {
                    return;
                }
                byte[] data = File.ReadAllBytes(ofd.FileName);
                byte[] result = new byte[data.Length + 1];
                result[0] = 3;
                Buffer.BlockCopy(data, 0, result, 1,data.Length);

                foreach (var proxSocket in ClientProxClentList)
                {
                    if (!proxSocket.Connected)
                    {
                        continue;
                    }
                    proxSocket.Send(result, SocketFlags.None);
                }
            }
           
        }

        private void button1_Click(object sender, EventArgs e)
        {
            foreach (var proxSocket in ClientProxClentList)
            {
                if (proxSocket.Connected)
                {
                    proxSocket.Send(new byte[] { 2 }, SocketFlags.None);
                }
            }
        }
    }
}



客户端

点击按钮连接Server,在外面创建一个socket对象名称为ClientSocket.方便其他地方调用,连接成功后new一个线程名称thread来处理接受到的消息,注意.thread设置为后台线程thread.IsBackground = true,线程开始的时候把当前的socket对象作为参数给它,thread.Start(ClientSocket);

private void btnConnect_Click(object sender, EventArgs e)
        {
            Socket socket = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
            ClientSocket = socket;
            try
            {
                socket.Connect(IPAddress.Parse(txtIP.Text), int.Parse(txtPort.Text));
            }
            catch (Exception ex)
            {                
                MessageBox.Show("Bad");
                return;
            }            
            AppendTextToTxtLog(string.Format("服务端{0}已连接",ClientSocket.RemoteEndPoint.ToString()));
            Thread thread = new Thread(new ParameterizedThreadStart(ReceiveData));
            thread.IsBackground = true;
            thread.Start(ClientSocket);
        }

消息接受方法ReceiveData(), socket对象.Receive(data, 0, data.Length, SocketFlags.None);返回值是实际接受的字节流长度,变量名readLen,后面要用.

public void ReceiveData(object obj)
        {
            Socket proxSocket = obj as Socket;
            byte[] data = new byte[1024 * 1024];
            while (true)
            {
                int readLen = 0;
                try
                {
                    readLen = proxSocket.Receive(data, 0, data.Length, SocketFlags.None);
                }
                catch (Exception)
                {
                    //异常退出时
                    AppendTextToTxtLog(string.Format("服务端{0}非正常退出", proxSocket.RemoteEndPoint.ToString()));
                    StopConnetct();
                    return;
                }
                if (readLen <= 0)
                {
                    //客户端正常退出
                    AppendTextToTxtLog(string.Format("服务端:{0}正常退出", proxSocket.RemoteEndPoint.ToString()));                    
                    StopConnetct();
                    return;//方法结束->终结当前接受客户端数据的异步线程
                }
                //接受的数据中第一个字节如果是1,那么是字符串.2是闪屏.3是文件
                if (data[0]==1)
                {
                    string strMsg = ProcessRecieveString(data, readLen);
                    AppendTextToTxtLog(string.Format("接收到服务端{0}的消息{1}", proxSocket.RemoteEndPoint.ToString(), strMsg));
                }
                else if (data[0] == 2)
                {
                    ProcessRecieveShake();
                }
                else if (data[0]==3)
                {
                    ProcessRecieveFile(data, readLen);
                }
            }
        }

下面是对字节流首位分别是1,2,3的处理方法

 public string ProcessRecieveString(byte[] data,int readLen)
        {
            string str = Encoding.Default.GetString(data, 1, readLen);
            return str;
        }
        public void ProcessRecieveShake()
        {
            Point oldLocation = this.Location;
            Random r = new Random();
            
            if (this.InvokeRequired)
            {
                txtLog.BeginInvoke(new Action(Shake),oldLocation,r);
            }
            else
            {
                Shake(oldLocation, r);
            }         
        }

        private void Shake(Point oldLocation, Random r)
        {
            for (int i = 0; i < 50; i++)
            {
                this.Location = new Point(r.Next(oldLocation.X - 5, oldLocation.X + 5), r.Next(oldLocation.Y - 5, oldLocation.Y + 5));
                Thread.Sleep(50);
                this.Location = oldLocation;
            }
        }

        public void ProcessRecieveFile(byte[] data,int readLen)
        {
            using (SaveFileDialog sfd = new SaveFileDialog())
            {
                sfd.DefaultExt = "txt";
                sfd.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";
                if (sfd.ShowDialog(this) != DialogResult.OK)
                {
                    return;
                }
                byte[] fileData = new byte[readLen - 1];
                Buffer.BlockCopy(data, 1, fileData, 0, readLen - 1);
                File.WriteAllBytes(sfd.FileName, fileData);
                AppendTextToTxtLog(string.Format("接收到文件,已保存到{0}", sfd.FileName));
            }
        }
下面是发送消息的代码(和服务端的基本差不多)
 private void btnSend_Click(object sender, EventArgs e)
        {
            // AppendTextToTxtLog("123");
            if (ClientSocket==null)
            {
                return;
            }
            if (ClientSocket.Connected)
            {
                byte[] data = Encoding.Default.GetBytes(txtSendMsg.Text);
                ClientSocket.Send(data, 0, data.Length, SocketFlags.None);
            }
            
        }

下面是客户端的整体代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace SocketClient
{
    public partial class Mianfrm : Form
    {
        public Mianfrm()
        {
            InitializeComponent();
            //Control.CheckForIllegalCrossThreadCalls = false;
        }
        public Socket ClientSocket { get; set;   }
        private void btnConnect_Click(object sender, EventArgs e)
        {
            Socket socket = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
            ClientSocket = socket;
            try
            {
                socket.Connect(IPAddress.Parse(txtIP.Text), int.Parse(txtPort.Text));
            }
            catch (Exception ex)
            {                
                MessageBox.Show("Bad");
                return;
            }            
            AppendTextToTxtLog(string.Format("服务端{0}已连接",ClientSocket.RemoteEndPoint.ToString()));
            Thread thread = new Thread(new ParameterizedThreadStart(ReceiveData));
            thread.IsBackground = true;
            thread.Start(ClientSocket);
        }
        public void ReceiveData(object obj)
        {
            Socket proxSocket = obj as Socket;
            byte[] data = new byte[1024 * 1024];
            while (true)
            {
                int readLen = 0;
                try
                {
                    readLen = proxSocket.Receive(data, 0, data.Length, SocketFlags.None);
                }
                catch (Exception)
                {
                    //异常退出时
                    AppendTextToTxtLog(string.Format("服务端{0}非正常退出", proxSocket.RemoteEndPoint.ToString()));
                    StopConnetct();
                    return;
                }
                if (readLen <= 0)
                {
                    //客户端正常退出
                    AppendTextToTxtLog(string.Format("服务端:{0}正常退出", proxSocket.RemoteEndPoint.ToString()));                    
                    StopConnetct();
                    return;//方法结束->终结当前接受客户端数据的异步线程
                }
                //接受的数据中第一个字节如果是1,那么是字符串.2是闪屏.3是文件
                if (data[0]==1)
                {
                    string strMsg = ProcessRecieveString(data, readLen);
                    AppendTextToTxtLog(string.Format("接收到服务端{0}的消息{1}", proxSocket.RemoteEndPoint.ToString(), strMsg));
                }
                else if (data[0] == 2)
                {
                    ProcessRecieveShake();
                }
                else if (data[0]==3)
                {
                    ProcessRecieveFile(data, readLen);
                }
            }
        }
        public string ProcessRecieveString(byte[] data,int readLen)
        {
            string str = Encoding.Default.GetString(data, 1, readLen);
            return str;
        }
        public void ProcessRecieveShake()
        {
            Point oldLocation = this.Location;
            Random r = new Random();
            
            if (this.InvokeRequired)
            {
                txtLog.BeginInvoke(new Action(Shake),oldLocation,r);
            }
            else
            {
                Shake(oldLocation, r);
            }         
        }

        private void Shake(Point oldLocation, Random r)
        {
            for (int i = 0; i < 50; i++)
            {
                this.Location = new Point(r.Next(oldLocation.X - 5, oldLocation.X + 5), r.Next(oldLocation.Y - 5, oldLocation.Y + 5));
                Thread.Sleep(50);
                this.Location = oldLocation;
            }
        }

        public void ProcessRecieveFile(byte[] data,int readLen)
        {
            using (SaveFileDialog sfd = new SaveFileDialog())
            {
                sfd.DefaultExt = "txt";
                sfd.Filter = "文本文件(*.txt)|*.txt|所有文件(*.*)|*.*";
                if (sfd.ShowDialog(this) != DialogResult.OK)
                {
                    return;
                }
                byte[] fileData = new byte[readLen - 1];
                Buffer.BlockCopy(data, 1, fileData, 0, readLen - 1);
                File.WriteAllBytes(sfd.FileName, fileData);
                AppendTextToTxtLog(string.Format("接收到文件,已保存到{0}", sfd.FileName));
            }
        }
        public void AppendTextToTxtLog(string txt)
        {
            if (txtLog.InvokeRequired)
            {
                txtLog.BeginInvoke(new Action(s =>{this.txtLog.Text = String.Format("{0}\r\n{1}", s, txtLog.Text);}), txt);
            }
            else
            {
                this.txtLog.Text = string.Format("{0}\r\n{1}", txt, txtLog.Text);
            }
        }
        private void btnSend_Click(object sender, EventArgs e)
        {
            // AppendTextToTxtLog("123");
            if (ClientSocket==null)
            {
                return;
            }
            if (ClientSocket.Connected)
            {
                byte[] data = Encoding.Default.GetBytes(txtSendMsg.Text);
                ClientSocket.Send(data, 0, data.Length, SocketFlags.None);
            }
            
        }
        private void StopConnetct()
        {
            try
            {
                if (ClientSocket.Connected)
                {
                    ClientSocket.Shutdown(SocketShutdown.Both);
                    ClientSocket.Close(100);
                }
            }
            catch (Exception ex)
            {
            }
        }

        private void Mianfrm_FormClosing(object sender, FormClosingEventArgs e)
        {
            StopConnetct();

        }

        private void Mianfrm_Load(object sender, EventArgs e)
        {
            AppendTextToTxtLog("请单击连接到服务器");
        }
    }
}

最后是软件的界面,






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