http://download.csdn.net/detail/lxp520llq/4305137 欢迎下载 单客户端、多线程、支持拖放文件并传输的小工具，本人刚学Socket时写的，望大家不要拍砖~~~
class Server //服务端方法 { #region 绑定IP、端口 IniOperate io = new IniOperate("C:\\lwj.ini"); public Socket Bind() { Socket sl = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint iep=new IPEndPoint(IPAddress.Parse(Service.GetLocatIP()),int.Parse( io.GetIni("端口设置","port","5697")));//绑定的IP与端口 if (!sl.Connected) { try { sl.Bind(iep); sl.Listen(100); } catch { sl = null; } } return sl; } #endregion public byte[] sendMsg(string msg) { byte[] msgArr = System.Text.Encoding.UTF8.GetBytes(msg); return msgArr; } }class Service//获取IP { private static string IP; public static string GetLocatIP() { foreach (IPAddress _IPAddress in Dns.GetHostEntry(Dns.GetHostName()).AddressList)//遍历当前主机IP协议簇 { if (_IPAddress.AddressFamily.ToString() == "InterNetwork")//如果协议名为"InterNetwork"，则表明是本机IP地址 { IP = _IPAddress.ToString(); } } return IP; } }class IniOperate//操作配置文件方法 INI格式 { [DllImport("kernel32")] private static extern bool WritePrivateProfileString(string section, string key, string value, string fileName);//必须有static、extern，方法名必须与所调用的属性类中方法名相同，参数类型必须与元方法相同 [DllImport("kernel32")] private static extern bool GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int valSize, string fileName); public IniOperate(string iniUrl) { url = iniUrl; } private string url; private StringBuilder strB=new StringBuilder(1024);//设置一个接受数据的容器 private const int size = 1024;//设置容器的大小 #region 写入数据 public bool SetIni(string node, string key, string value) { return WritePrivateProfileString(node, key, value, url); } #endregion #region 读取数据 public string GetIni(string node, string key,string defaultValue) { GetPrivateProfileString(node, key, defaultValue, strB, size,url); return strB.ToString(); } #endregion #region 删除文件或数据 public string Delete()//删文件 { if (File.Exists(url)) { File.Delete(url); return "删除成功"; } else { return "指定的文件不存在"; } } public void Delete(string node,string key)//删指定节点下的键 { WritePrivateProfileString(node, key, null, url); } public void Delete(string node)//删指定的节点 { WritePrivateProfileString(node, null, null, url); } #endregion }public partial class LWJ : Form//主程序方法 { public LWJ() { InitializeComponent(); System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;//关闭对窗体上控件的跨线程检查 } Server s = new Server(); IniOperate io = new IniOperate("C:\\lwj.ini"); Socket sL;//用于监听的套接字 Socket sClient;//用与服务的套接字 int Acount;//用来计算当前连接者的总数 Dictionary<string, Socket> dic = new Dictionary<string, Socket>();//用于存储请求者的ip与端口 private void Form1_Load(object sender, EventArgs e) { if (!File.Exists("C:\\lwj.ini")) { io.SetIni("端口设置", "port", "5697");//写一个初始的端口 } sL = s.Bind(); if (sL!=null) { Thread t = new Thread(fun1); t.IsBackground = true; t.Priority = ThreadPriority.AboveNormal; t.Start();//用一个线程启动持续监听 Thread t2 = new Thread(forIp); t2.IsBackground = true; t2.Start();//用一个线程启动遍历当前局域网内打开指定端口主机然后创建连接的方法 } else { MessageBox.Show("本程序所需端口已被其他程序占用~~~，请检查您的'" + io.GetIni("端口设置", "port", "5697") + "端口'！！！或者打开C:\\ipe.ini文件，更改端口号\\(≧▽≦)/"); this.Close(); } } private void Form1_Activated(object sender, EventArgs e) { msg.Focus();//在窗体获得焦点时 把焦点给指定控件 } #region 持续监听请求的连接 void fun1() { while (true) { sClient = sL.Accept(); Thread t3 = new Thread(getMsg); t3.IsBackground = true; t3.Start(); } } #endregion #region 接收信息 void getMsg() { while (true) { try { while (true) { byte[] serverMsg = new byte[1024 * 1024*5];//定义一个接收信息的指定大小的缓存区(byte数组) int msgCount=sClient.Receive(serverMsg); if (serverMsg[0]==1)//判断接收的数据时信息还是文件 { if (MessageBox.Show(sClient.RemoteEndPoint.ToString().Split(':')[0] + "传来一个文件：", "是否接收", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK) { SaveFileDialog sf = new SaveFileDialog(); if (sf.ShowDialog(this) == System.Windows.Forms.DialogResult.OK) { string saveUrl = sf.FileName; using (FileStream fs = new FileStream(saveUrl, FileMode.Create)) { fs.Write(serverMsg, 1, msgCount - 1); MessageBox.Show("文件保存成功~"); } } } } else { string context = System.Text.Encoding.UTF8.GetString(serverMsg, 0, msgCount); richTextBox1.AppendText(sClient.RemoteEndPoint.ToString().Split(':')[0] + "：" + context + "\r\n"); } } } catch(Exception)//发信息方断开连接 { Acount -= 1; label4.Text = Acount.ToString(); dic.Remove(this.sClient.RemoteEndPoint.ToString().Split(':')[0]); listBox1.Items.Remove(this.sClient.RemoteEndPoint.ToString().Split(':')[0]); break; } } } #endregion /*发送消息*/ private void button2_Click(object sender, EventArgs e) { if (listBox1.SelectedItem==null) { MessageBox.Show("请选择接收的用户"); } else if (msg.Text=="") { MessageBox.Show("请输入发送内容"); } else { dic[listBox1.SelectedItem.ToString()].Send(s.sendMsg(msg.Text));//发送消息 richTextBox1.AppendText("Me：" + msg.Text+"\r\n"); msg.Text = ""; } } private void msg_DragEnter(object sender, DragEventArgs e) { if (e.Data.GetDataPresent(DataFormats.FileDrop)) { e.Effect = DragDropEffects.Link;//获取拖动文件的路径赋给目标区 } else { e.Effect = DragDropEffects.None; } } /*发送文件*/ private void msg_DragDrop(object sender, DragEventArgs e) { if (listBox1.SelectedItem==null) { MessageBox.Show("请先选择接收文件的用户~"); } else { string fileUrl= ((System.Array)e.Data.GetData(DataFormats.FileDrop)).GetValue(0).ToString();//把文本框得到的路径赋给指定的字符创供发送文件用 using (FileStream fs=new FileStream(fileUrl,FileMode.Open)) { byte[] arrB = new byte[1024 * 1024 * 5];//定义传输文件的缓存区 int a = fs.Read(arrB, 0, arrB.Length);//把文件以二进制的方式读到数组中 byte[] arrSendFile = new byte[a + 1];//设置数组大小 arrSendFile[0] = 1;//放入发送数据的标识 Buffer.BlockCopy(arrB, 0, arrSendFile, 1, a);/*将arrB中数据复制到arrSendFile数组中，与上循环效果相同*/ dic[listBox1.SelectedItem.ToString()].Send(arrSendFile);//发送文件到服务器 } } } #region 遍历局域网 public void forIp() { while (true) { for (int i = 2; i <= 255; i++) { string pingIP = "192.168.1." + i.ToString(); if (dic.ContainsKey(pingIP) || Service.GetLocatIP()==pingIP) { continue;//如果所Ping的IP是本机则退出本次循环 } Ping myPing = new Ping(); myPing.PingCompleted += new PingCompletedEventHandler(addItem); myPing.SendAsync(pingIP,1,1);//参数：IP地址、发送数据包大小单位是字节、返回数据包的大小 } Thread.Sleep(3000);//隔3秒循环一次局域网，用于发现新的用户 } } #endregion #region 判断是否能ping通IP与端口 public void addItem(object sender, PingCompletedEventArgs e) { if (e.Reply.Status == IPStatus.Success) { string rsl = e.Reply.Address.ToString();//得到Ping通的IP try { Socket socketSend = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint iep = new IPEndPoint(IPAddress.Parse(rsl), int.Parse(io.GetIni("端口设置", "port", "5697")));//绑定的IP与端口 socketSend.Connect(iep); dic.Add(rsl, socketSend); listBox1.Items.Add(rsl.ToString()); Acount += 1; label4.Text = Acount.ToString(); } catch { }//能ping通但打不开端口的主机 } } #endregion /*群发消息*/ private void button1_Click(object sender, EventArgs e) { if (dic.Values.Count==0) { MessageBox.Show("当前没有已连接的用户!"); } else if (msg.Text=="") { MessageBox.Show("请输入内容!"); } else { foreach (var ds in dic.Values) { ds.Send(s.sendMsg(msg.Text)); } richTextBox1.AppendText(msg.Text + "\r\n"); msg.Text =""; } } }
