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   源码介绍

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实现udp群聊

using System;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using CommonUntility;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;
using System.Runtime.Serialization;
using CSharpWin;
using System.Drawing.Drawing2D;
using System.Text.RegularExpressions;

namespace LanChatterApp_ReConstruct_
{
    public partial class MainFrm : Form
    {
        public MainFrm()
        {
            InitializeComponent();
        }

        public IPAddress broadIPAddress = IPAddress.Parse("255.255.255.255");  //组播地址  
        public static int lanPort = 11010;  //端口号    
        public IPEndPoint iep;
        public UdpClient listenClient = new UdpClient(lanPort);
        public bool isRun = false;  //监听是否启用的标志   
        public string localIP;   //本机ip地址      
        public string localName;  //本机名称      
        public string remoteIP;   //远程主机ip地址    
        public string remoteName;  //远程主机名称     
        public bool flag = false;  //显示图片或者隐藏标志位
        public bool emotionFlag = false;

        #region RichTextBox线程与UI交互委托，用于添加文本内容及上色

        /// <summary>       
        /// 添加聊天内容到聊天对话框中    
        /// </summary>       
        /// <param name="info">消息呈现内容</param>   
        /// <param name="titleOrContentFlag">标记：此信息是信息头还是信息内容,1代表是消息头，2代表是消息体</param>    
        /// <param name="selfOrOthersFlag">标记：此信息是自己发送的还是别人发送的，1代表是自己发送，2代表是别人发送</param>    
        private void AddTextBox(string info, int titleOrContentFlag, int selfOrOthersFlag)
        {

            if (1 == titleOrContentFlag)  //如果是消息头           
            {
                string title = info; if (1 == selfOrOthersFlag)  //如果是自己发送  
                {
                    CommonUntility.RichTextBoxEx.AppendText(rAllContent, title, Color.Green);
                }
                else  //如果是别人发送       
                { 
                    CommonUntility.RichTextBoxEx.AppendText(rAllContent, title, Color.Blue); 
                }
            }
            else if (2 == titleOrContentFlag)  //如果是消息体         
            {
                string content = info;
                CommonUntility.RichTextBoxEx.AppendText(rAllContent, content, Color.Black);
            }
        }

      
        #endregion
        private void mainFrm_Load(object sender, EventArgs e)
        {
            listenClient.EnableBroadcast = true;  //允许发送和接受广播     
            iep = new IPEndPoint(broadIPAddress, lanPort); 
            lstUsers.Items.Add("       Computer IP---Computer Name");
            openListeningThread();  //开启监听线程      
            SendInfoOnline();//发送上线广播信息 

            LoadingEmotion();
        }

        private void LoadingEmotion()
        {
            PictureBox[,] picList = new PictureBox[5,10];
            for (int i = 0; i < 5; i  )
            {
                for (int j = 0; j < 10; j  )
                {
                    int emotionSequenceCount = i * 10   j;
                    picList[i,j] = new PictureBox();
                    picList[i, j].Height = picList[i, j].Width = 24;
                    picList[i, j].Image = Image.FromFile(".\\Face2\\"   emotionSequenceCount   ".gif");
                    picList[i, j].Top = i * 24;
                    picList[i, j].Left = j * 24;
                    picList[i, j].Tag = "#("   emotionSequenceCount   ")#";
                    picList[i, j].Parent = panImg;
                    picList[i, j].Click  = new EventHandler((sender, e) => 
                    { 
                        this.rSendContent.AppendText("#("   emotionSequenceCount   ")#");
                        emotionFlag = false;
                        this.panImg.Visible = emotionFlag;
                    });
                    panImg.Controls.Add(picList[i,j]);
                }
            }
        }
       
        /// <summary>    
        /// 开启监听线程     
        /// </summary>      
        private void openListeningThread() 
        { 
            isRun = true;
            Thread t = new Thread(new ThreadStart(() => 
            {
                IPEndPoint ipEnd = new IPEndPoint(broadIPAddress, lanPort); 
                try
                {
                    while (isRun)
                    {
                        try
                        {
                            byte[] recInfo = listenClient.Receive(ref ipEnd);  //接受内容,存储到byte数组中              
                            DealWithAcceptedInfo(recInfo); //处理接收到的数据                
                        }
                        catch (Exception ex) { MessageBox.Show(ex.Message); }
                    } listenClient.Close(); isRun = false;
                }
                catch (SocketException se) { throw new Exception(se.Message); }  //捕捉试图访问套接字时发生错误。      
                catch (ObjectDisposedException oe) { throw new Exception(oe.Message); } //捕捉Socket 已关闭        
                catch (InvalidOperationException pe) { throw new Exception(pe.Message); } //捕捉试图不使用 Blocking 属性更改阻止模式。   
                catch (Exception ex) { throw new Exception(ex.Message); }
            }));

            t.Start(); 
        }
       
        /// <summary>        
        /// 方法：处理接到的数据       
        /// </summary>        
        private void DealWithAcceptedInfo(byte[] recData)
        {
            BinaryFormatter formatter = new BinaryFormatter();
            MessageModel recvMessage;
            MemoryStream ms = new MemoryStream(recData);
            try { recvMessage = (MessageModel)formatter.Deserialize(ms); }
            catch (SerializationException e) { throw new Exception(e.Message); }

            switch (recvMessage.Flag)
            {
                case "0x00":  //用户上线 

                    //这里很关键，当检测到一个新的用户上线，那么我们需要给这个新用户发送自己的机器消息，以便新用户能够自动添加进列表中。
                    SendInfoOnline(recvMessage.UserIp); 
                    if (lstUsers.FindString(recvMessage.UserIp   "---"   recvMessage.UserName) <= 0)  //如果用户不存在     
                    {
                        lstUsers.Invoke((Action)(() => { lstUsers.Items.Add(recvMessage.UserIp   "---"   recvMessage.UserName); }));
                        lsbLog.Invoke((Action)(() => { lsbLog.Items.Add("User["   recvMessage.UserIp   "] is online now!"); }));
                    }
                    break;

                case "0x01":  //用户聊天        
                    rAllContent.Invoke((Action)(() =>
                        {
                            rAllContent.AppendText("\r\n");
                            AddTextBox(recvMessage.UserIp   "    "   DateTime.Now   "\r\n", 1, 2);  //这是接收到了别人发来的信息     
                            //AddTextBox(recvMessage.MsgContent   "\r\n", 2, 2);//将发送的消息添加到窗体中   
                            ParseEmotionInsert.AddContent(recvMessage.MsgContent, rAllContent);
                            rAllContent.AppendText("\r\n");
                       }));
                    break;

                case "0x03":  //用户下线        
                    if (lstUsers.FindString(recvMessage.UserIp   "---"   recvMessage.UserName) > 0)  //如果用户已经存在   
                    {
                        MessageBox.Show(recvMessage.UserIp   "---"   recvMessage.UserName);
                        lstUsers.Invoke((Action)(() => { lstUsers.Items.Remove(recvMessage.UserIp   "---"   recvMessage.UserName); }));
                        lsbLog.Invoke((Action)(() => { lsbLog.Items.Add("User["   recvMessage.UserIp   "] is offline now!"); }));
                    } 
                    break;
                default: break;
            }
        }

      
        /// <summary>        
        /// 广播发送上线消息        
        /// </summary>        
        private void SendInfoOnline()
        {
            localIP = GetLocalIPandName.getLocalIP();   //得到本机ip     
            localName = GetLocalIPandName.getLocalName(); //得到本机的机器名称 

            MessageModel messageModel = new MessageModel();
            messageModel.Flag = "0x00";
            messageModel.UserIp = localIP;
            messageModel.UserName = localName;

            byte[] messageBytes = Parse.ToByteArray(messageModel);
            SendInfoByIEP.SendInfoToAll(listenClient, messageBytes, iep);//发送广播上线信息    
        }
        /// <summary>        
        /// 向单个ip发送上线消息        
        /// </summary>        
        /// <param name="remoteip"></param>        
        private void SendInfoOnline(string remoteip)
        {
            localIP = GetLocalIPandName.getLocalIP();   //得到本机ip   
            localName = GetLocalIPandName.getLocalName(); //得到本机的机器名称

            MessageModel messageModel = new MessageModel();
            messageModel.Flag = "0x00";
            messageModel.UserIp = localIP;
            messageModel.UserName = localName;
            byte[] messageBytes = Parse.ToByteArray(messageModel);

            IPEndPoint _iep = new IPEndPoint(IPAddress.Parse(remoteip), lanPort);
            SendInfoByIEP.SendInfoToAll(listenClient, messageBytes, _iep);  //发送广播上线信息    
        }
        /// <summary>      
        /// 广播发送下线消息     
        /// </summary>       
        private void SendInfoOffline()
        {
            localIP = GetLocalIPandName.getLocalIP();   //得到本机ip          
            localName = GetLocalIPandName.getLocalName(); //得到本机的机器名称
            
            MessageModel messageModel = new MessageModel();
            messageModel.Flag = "0x03";
            messageModel.UserIp = localIP;
            messageModel.UserName = localName;

            byte[] messageBytes = Parse.ToByteArray(messageModel);
            SendInfoByIEP.SendInfoToAll(listenClient, messageBytes, iep);  //发送广播下线信息      
        }
        /// <summary>        
        /// 遍历列表，发送消息        
        /// </summary>        
        private void SendInfo(string data)
        {
            try
            {
                byte[] _data = Encoding.Default.GetBytes(data); 
                foreach (string s in lstUsers.Items)   //遍历列表          
                {
                    if (s.Contains("."))  //确定包含的是ip地址
                    {
                        string _ip = s.Split('-')[0]; 
                        if (!_ip.Equals(localIP))  //将自身排除在外      
                        {
                            IPEndPoint iepe = new IPEndPoint(IPAddress.Parse(_ip), lanPort);   //套接字申明         

                            //这里我们必须申明一个新的实例以避免重复接收问题。(如果利用原来的listenClient实例，将会造成重复接收。)
                            UdpClient udp = new UdpClient();
                            udp.Send(_data, _data.Length, iepe);  //发送         
                        }
                    }
                }
            }
            catch (Exception ex) { MessageBox.Show(ex.Message); }
        }
        private void SendInfo(byte[] data)
        {
            try
            {
                foreach (string s in lstUsers.Items)   //遍历列表          
                {
                    if (s.Contains("."))  //确定包含的是ip地址
                    {
                        string _ip = s.Split('-')[0];
                        if (!_ip.Equals(localIP))  //将自身排除在外      
                        {
                            IPEndPoint iepe = new IPEndPoint(IPAddress.Parse(_ip), lanPort);   //套接字申明         

                            //这里我们必须申明一个新的实例以避免重复接收问题。(如果利用原来的listenClient实例，将会造成重复接收。)
                            UdpClient udp = new UdpClient();
                            udp.Send(data, data.Length, iepe);  //发送         
                        }
                    }
                }
            }
            catch (Exception ex) { MessageBox.Show(ex.Message); }
        }

        /// <summary>       
        /// “发送按钮”点击事件        
        /// </summary>       
        private void btnSend_Click(object sender, EventArgs e)
        {
            if (rSendContent.Text == "") 
            { 
                MessageBox.Show("Please fill in some words!","Notification",MessageBoxButtons.OK,MessageBoxIcon.Information); 
            }
            else
            {
                MessageModel messageModel = new MessageModel();
                messageModel.Flag = "0x01";
                messageModel.UserIp = localIP;
                messageModel.UserName = localName;
                messageModel.MsgContent = rSendContent.Text;

                byte[] byteData = Parse.ToByteArray(messageModel);
                SendInfo(byteData);  //发送消息            

                rAllContent.AppendText(Environment.NewLine);
                AddTextBox(localIP   "    "   DateTime.Now   "\r\n", 1, 1);  //将发送的消息添加到窗体中  

                ParseEmotionInsert.AddContent(rSendContent.Text,rAllContent);
               
                //AddTextBox(rSendContent.Text   "\r\n", 2, 1);  //将发送的消息添加到窗体中      
                this.rSendContent.Text = string.Empty;  //清空发送内容       
            }
            this.rAllContent.ScrollToCaret();

            base.Invalidate(true);

        }
        
        /// <summary>       
        /// 点击退出时，发送下线消息        
        /// </summary>        
        private void mainFrm_FormClosing(object sender, FormClosingEventArgs e)
        {
            SendInfoOffline();
            Environment.Exit(0);   //用户退出        
        }

        private void picEmotion_Click(object sender, EventArgs e)
        {
            emotionFlag = !emotionFlag;
            panImg.Visible = emotionFlag;
        }
    }
}