C#实现TCP通讯协议
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Data.SqlClient; using System.Drawing; using System.IO; using System.Net; using System.Net.Sockets; using System.Text; using System.Threading; using System.Windows.Forms; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); TextBox.CheckForIllegalCrossThreadCalls = false; } Thread threadWatch = null; // 负责监听客户端连接请求的 线程; Socket socketWatch = null; Dictionary<string, Socket> dict = new Dictionary<string, Socket>(); Dictionary<string, Thread> dictThread = new Dictionary<string, Thread>(); /// <summary> /// 啟動監控服務 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void button1_Click(object sender, EventArgs e) { // 创建负责监听的套接字,注意其中的参数; socketWatch = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); // 获得文本框中的IP对象; IPAddress address = IPAddress.Parse(textBox1.Text.Trim()); // 创建包含ip和端口号的网络节点对象; IPEndPoint endPoint = new IPEndPoint(address, int.Parse(textBox2.Text.Trim())); try { // 将负责监听的套接字绑定到唯一的ip和端口上; socketWatch.Bind(endPoint); } catch (SocketException se) { MessageBox.Show("异常:" + se.Message); return; } // 设置监听队列的长度; socketWatch.Listen(10); // 创建负责监听的线程; threadWatch = new Thread(WatchConnecting); threadWatch.IsBackground = true; threadWatch.Start(); ShowMsg("服务器启动监听成功!"); } /// <summary> /// 监听客户端请求的方法; /// </summary> void WatchConnecting() { while (true) // 持续不断的监听客户端的连接请求; { // 开始监听客户端连接请求,Accept方法会阻断当前的线程; Socket sokConnection = socketWatch.Accept(); // 一旦监听到一个客户端的请求,就返回一个与该客户端通信的 套接字; // 想列表控件中添加客户端的IP信息; listBox1.Items.Add(sokConnection.RemoteEndPoint.ToString()); // 将与客户端连接的 套接字 对象添加到集合中; dict.Add(sokConnection.RemoteEndPoint.ToString(), sokConnection); ShowMsg("客户端连接成功!"); Thread thr = new Thread(RecMsg); thr.IsBackground = true; thr.Start(sokConnection); dictThread.Add(sokConnection.RemoteEndPoint.ToString(), thr); // 将新建的线程 添加 到线程的集合中去。 } } void RecMsg(object sokConnectionparn) { Socket sokClient = sokConnectionparn as Socket; while (true) { // 定义一个2M的缓存区; byte[] arrMsgRec = new byte[1024 * 1024 * 2]; // 将接受到的数据存入到输入 arrMsgRec中; int length = -1; try { length = sokClient.Receive(arrMsgRec); // 接收数据,并返回数据的长度; } catch (SocketException se) { ShowMsg("异常:" + se.Message); // 从 通信套接字 集合中删除被中断连接的通信套接字; dict.Remove(sokClient.RemoteEndPoint.ToString()); // 从通信线程集合中删除被中断连接的通信线程对象; dictThread.Remove(sokClient.RemoteEndPoint.ToString()); // 从列表中移除被中断的连接IP listBox1.Items.Remove(sokClient.RemoteEndPoint.ToString()); break; } catch (Exception e) { ShowMsg("异常:" + e.Message); // 从 通信套接字 集合中删除被中断连接的通信套接字; dict.Remove(sokClient.RemoteEndPoint.ToString()); // 从通信线程集合中删除被中断连接的通信线程对象; dictThread.Remove(sokClient.RemoteEndPoint.ToString()); // 从列表中移除被中断的连接IP listBox1.Items.Remove(sokClient.RemoteEndPoint.ToString()); break; } ///--------------------------------------接收客戶端發送過來的信息---------------------------------------------- string strMsg = System.Text.Encoding.UTF8.GetString(arrMsgRec, 1, length - 1);// 将接受到的字节数据转化成字符串; ShowMsg(strMsg); ///------------------------------------向客戶端發送回執信息-------------------------------------- string WD = strMsg.Substring(42, 4); string SD = strMsg.Substring(47, 4); string Mdl = strMsg.Substring(21, 10); string ZOOM = strMsg.Substring(32, 1); string SendTime = "20" + strMsg.Substring(3, 17) + ":000"; if (Mdl == "0072916200") { Mdl = "冰箱-01"; } else if (Mdl == "0072915200") { Mdl = "冰箱-03"; } else if (Mdl == "0072914500") { Mdl = "冰箱-04"; } else if (Mdl == "0072912300") { Mdl = "冰箱-02"; } SqlConnection sqlcon = new SqlConnection("Data Source=10.99.106.***;Initial Catalog=PCA_REPORT;User ID=***;pwd=***"); string addx = "INSERT INTO PCA_REPORT..Temperature VALUES ('" + Mdl + "','" + WD + "','" + SD + "','" + SendTime + "',getdate(),'" + ZOOM + "')"; DataSet ds = new DataSet(); SqlDataAdapter adapter = new SqlDataAdapter(addx, sqlcon); adapter.Fill(ds); string send = "*RR," + strMsg.Substring(3, 17) + "," + strMsg.Substring(21, 10) + "#"; byte[] arrMsg = System.Text.Encoding.UTF8.GetBytes(send); // 将要发送的字符串转换成Utf-8字节数组; byte[] arrSendMsg = new byte[arrMsg.Length + 1]; arrSendMsg[0] = 0; // 表示发送的是消息数据 Buffer.BlockCopy(arrMsg, 0, arrSendMsg, 1, arrMsg.Length); for (int i = 0; i < listBox1.Items.Count; i++) { string strKey = listBox1.Items[i].ToString(); dict[strKey].Send(arrSendMsg);// 解决了 sokConnection是局部变量,不能再本函数中引用的问题; //ShowMsg(send); } } } void ShowMsg(string str) { textBox5.AppendText(str + "\r\n"); } private void label2_Click(object sender, EventArgs e) { } } }