C#的socket
四:SOCKET通信基本流程图:
根据socket通信基本流程图,总结通信的基本步骤:
服务器端:
第一步:创建一个用于监听连接的Socket对像;
第二步:用指定的端口号和服务器的ip建立一个EndPoint对像;
第三步:用socket对像的Bind()方法绑定EndPoint;
第四步:用socket对像的Listen()方法开始监听;
第五步:接收到客户端的连接,用socket对像的Accept()方法创建一个新的用于和客户端进行通信的socket对像;
第六步:通信结束后一定记得关闭socket;
客户端:
第一步:建立一个Socket对像;
第二步:用指定的端口号和服务器的ip建立一个EndPoint对像;
第三步:用socket对像的Connect()方法以上面建立的EndPoint对像做为参数,向服务器发出连接请求;
第四步:如果连接成功,就用socket对像的Send()方法向服务器发送信息;
第五步:用socket对像的Receive()方法接受服务器发来的信息 ;
第六步:通信结束后一定记得关闭socket;
服务端界面:
代码实现如下:
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Linq; 7 using System.Net; 8 using System.Net.Sockets; 9 using System.Text; 10 using System.Threading.Tasks; 11 using System.Windows.Forms; 12 using System.Threading; 13 using System.IO; 14 15 namespace SocketServer 16 { 17 public partial class FrmServer : Form 18 { 19 public FrmServer() 20 { 21 InitializeComponent(); 22 } 23 24 //定义回调:解决跨线程访问问题 25 private delegate void SetTextValueCallBack(string strValue); 26 //定义接收客户端发送消息的回调 27 private delegate void ReceiveMsgCallBack(string strReceive); 28 //声明回调 29 private SetTextValueCallBack setCallBack; 30 //声明 31 private ReceiveMsgCallBack receiveCallBack; 32 //定义回调:给ComboBox控件添加元素 33 private delegate void SetCmbCallBack(string strItem); 34 //声明 35 private SetCmbCallBack setCmbCallBack; 36 //定义发送文件的回调 37 private delegate void SendFileCallBack(byte[] bf); 38 //声明 39 private SendFileCallBack sendCallBack; 40 41 //用于通信的Socket 42 Socket socketSend; 43 //用于监听的SOCKET 44 Socket socketWatch; 45 46 //将远程连接的客户端的IP地址和Socket存入集合中 47 Dictionary<string, Socket> dicSocket = new Dictionary<string, Socket>(); 48 49 //创建监听连接的线程 50 Thread AcceptSocketThread; 51 //接收客户端发送消息的线程 52 Thread threadReceive; 53 54 /// <summary> 55 /// 开始监听 56 /// </summary> 57 /// <param name="sender"></param> 58 /// <param name="e"></param> 59 private void btn_Start_Click(object sender, EventArgs e) 60 { 61 //当点击开始监听的时候 在服务器端创建一个负责监听IP地址和端口号的Socket 62 socketWatch = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); 63 //获取ip地址 64 IPAddress ip=IPAddress.Parse(this.txt_IP.Text.Trim()); 65 //创建端口号 66 IPEndPoint point=new IPEndPoint(ip,Convert.ToInt32(this.txt_Port.Text.Trim())); 67 //绑定IP地址和端口号 68 socketWatch.Bind(point); 69 this.txt_Log.AppendText("监听成功"+" \r \n"); 70 //开始监听:设置最大可以同时连接多少个请求 71 socketWatch.Listen(10); 72 73 //实例化回调 74 setCallBack = new SetTextValueCallBack(SetTextValue); 75 receiveCallBack = new ReceiveMsgCallBack(ReceiveMsg); 76 setCmbCallBack = new SetCmbCallBack(AddCmbItem); 77 sendCallBack = new SendFileCallBack(SendFile); 78 79 //创建线程 80 AcceptSocketThread = new Thread(new ParameterizedThreadStart(StartListen)); 81 AcceptSocketThread.IsBackground = true; 82 AcceptSocketThread.Start(socketWatch); 83 } 84 85 /// <summary> 86 /// 等待客户端的连接,并且创建与之通信用的Socket 87 /// </summary> 88 /// <param name="obj"></param> 89 private void StartListen(object obj) 90 { 91 Socket socketWatch = obj as Socket; 92 while (true) 93 { 94 //等待客户端的连接,并且创建一个用于通信的Socket 95 socketSend = socketWatch.Accept(); 96 //获取远程主机的ip地址和端口号 97 string strIp=socketSend.RemoteEndPoint.ToString(); 98 dicSocket.Add(strIp, socketSend); 99 this.cmb_Socket.Invoke(setCmbCallBack, strIp); 100 string strMsg = "远程主机:" + socketSend.RemoteEndPoint + "连接成功"; 101 //使用回调 102 txt_Log.Invoke(setCallBack, strMsg); 103 104 //定义接收客户端消息的线程 105 Thread threadReceive = new Thread(new ParameterizedThreadStart(Receive)); 106 threadReceive.IsBackground = true; 107 threadReceive.Start(socketSend); 108 109 } 110 } 111 112 113 114 /// <summary> 115 /// 服务器端不停的接收客户端发送的消息 116 /// </summary> 117 /// <param name="obj"></param> 118 private void Receive(object obj) 119 { 120 Socket socketSend = obj as Socket; 121 while (true) 122 { 123 //客户端连接成功后,服务器接收客户端发送的消息 124 byte[] buffer = new byte[2048]; 125 //实际接收到的有效字节数 126 int count = socketSend.Receive(buffer); 127 if (count == 0)//count 表示客户端关闭,要退出循环 128 { 129 break; 130 } 131 else 132 { 133 string str = Encoding.Default.GetString(buffer, 0, count); 134 string strReceiveMsg = "接收:" + socketSend.RemoteEndPoint + "发送的消息:" + str; 135 txt_Log.Invoke(receiveCallBack, strReceiveMsg); 136 } 137 } 138 } 139 140 /// <summary> 141 /// 回调委托需要执行的方法 142 /// </summary> 143 /// <param name="strValue"></param> 144 private void SetTextValue(string strValue) 145 { 146 this.txt_Log.AppendText(strValue + " \r \n"); 147 } 148 149 150 private void ReceiveMsg(string strMsg) 151 { 152 this.txt_Log.AppendText(strMsg + " \r \n"); 153 } 154 155 private void AddCmbItem(string strItem) 156 { 157 this.cmb_Socket.Items.Add(strItem); 158 } 159 160 /// <summary> 161 /// 服务器给客户端发送消息 162 /// </summary> 163 /// <param name="sender"></param> 164 /// <param name="e"></param> 165 private void btn_Send_Click(object sender, EventArgs e) 166 { 167 try 168 { 169 string strMsg = this.txt_Msg.Text.Trim(); 170 byte[] buffer = Encoding.Default.GetBytes(strMsg); 171 List<byte> list = new List<byte>(); 172 list.Add(0); 173 list.AddRange(buffer); 174 //将泛型集合转换为数组 175 byte[] newBuffer = list.ToArray(); 176 //获得用户选择的IP地址 177 string ip = this.cmb_Socket.SelectedItem.ToString(); 178 dicSocket[ip].Send(newBuffer); 179 } 180 catch (Exception ex) 181 { 182 MessageBox.Show("给客户端发送消息出错:"+ex.Message); 183 } 184 //socketSend.Send(buffer); 185 } 186 187 /// <summary> 188 /// 选择要发送的文件 189 /// </summary> 190 /// <param name="sender"></param> 191 /// <param name="e"></param> 192 private void btn_Select_Click(object sender, EventArgs e) 193 { 194 OpenFileDialog dia = new OpenFileDialog(); 195 //设置初始目录 196 dia.InitialDirectory = @""; 197 dia.Title = "请选择要发送的文件"; 198 //过滤文件类型 199 dia.Filter = "所有文件|*.*"; 200 dia.ShowDialog(); 201 //将选择的文件的全路径赋值给文本框 202 this.txt_FilePath.Text = dia.FileName; 203 } 204 205 /// <summary> 206 /// 发送文件 207 /// </summary> 208 /// <param name="sender"></param> 209 /// <param name="e"></param> 210 private void btn_SendFile_Click(object sender, EventArgs e) 211 { 212 List<byte> list = new List<byte>(); 213 //获取要发送的文件的路径 214 string strPath = this.txt_FilePath.Text.Trim(); 215 using (FileStream sw = new FileStream(strPath,FileMode.Open,FileAccess.Read)) 216 { 217 byte[] buffer = new byte[2048]; 218 int r = sw.Read(buffer, 0, buffer.Length); 219 list.Add(1); 220 list.AddRange(buffer); 221 222 byte[] newBuffer = list.ToArray(); 223 //发送 224 //dicSocket[cmb_Socket.SelectedItem.ToString()].Send(newBuffer, 0, r+1, SocketFlags.None); 225 btn_SendFile.Invoke(sendCallBack, newBuffer); 226 227 228 } 229 230 } 231 232 private void SendFile(byte[] sendBuffer) 233 { 234 235 try 236 { 237 dicSocket[cmb_Socket.SelectedItem.ToString()].Send(sendBuffer, SocketFlags.None); 238 } 239 catch (Exception ex) 240 { 241 MessageBox.Show("发送文件出错:"+ex.Message); 242 } 243 } 244 245 private void btn_Shock_Click(object sender, EventArgs e) 246 { 247 byte[] buffer = new byte[1] { 2}; 248 dicSocket[cmb_Socket.SelectedItem.ToString()].Send(buffer); 249 } 250 251 /// <summary> 252 /// 停止监听 253 /// </summary> 254 /// <param name="sender"></param> 255 /// <param name="e"></param> 256 private void btn_StopListen_Click(object sender, EventArgs e) 257 { 258 socketWatch.Close(); 259 socketSend.Close(); 260 //终止线程 261 AcceptSocketThread.Abort(); 262 threadReceive.Abort(); 263 } 264 } 265 }
客户端界面
代码实现如下:
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Linq; 7 using System.Text; 8 using System.Threading.Tasks; 9 using System.Windows.Forms; 10 using System.Net.Sockets; 11 using System.Net; 12 using System.Threading; 13 using System.IO; 14 15 namespace SocketClient 16 { 17 public partial class FrmClient : Form 18 { 19 public FrmClient() 20 { 21 InitializeComponent(); 22 } 23 24 //定义回调 25 private delegate void SetTextCallBack(string strValue); 26 //声明 27 private SetTextCallBack setCallBack; 28 29 //定义接收服务端发送消息的回调 30 private delegate void ReceiveMsgCallBack(string strMsg); 31 //声明 32 private ReceiveMsgCallBack receiveCallBack; 33 34 //创建连接的Socket 35 Socket socketSend; 36 //创建接收客户端发送消息的线程 37 Thread threadReceive; 38 39 /// <summary> 40 /// 连接 41 /// </summary> 42 /// <param name="sender"></param> 43 /// <param name="e"></param> 44 private void btn_Connect_Click(object sender, EventArgs e) 45 { 46 try 47 { 48 socketSend = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); 49 IPAddress ip = IPAddress.Parse(this.txt_IP.Text.Trim()); 50 socketSend.Connect(ip, Convert.ToInt32(this.txt_Port.Text.Trim())); 51 //实例化回调 52 setCallBack = new SetTextCallBack(SetValue); 53 receiveCallBack = new ReceiveMsgCallBack(SetValue); 54 this.txt_Log.Invoke(setCallBack, "连接成功"); 55 56 //开启一个新的线程不停的接收服务器发送消息的线程 57 threadReceive = new Thread(new ThreadStart(Receive)); 58 //设置为后台线程 59 threadReceive.IsBackground = true; 60 threadReceive.Start(); 61 } 62 catch (Exception ex) 63 { 64 MessageBox.Show("连接服务端出错:" + ex.ToString()); 65 } 66 } 67 68 /// <summary> 69 /// 接口服务器发送的消息 70 /// </summary> 71 private void Receive() 72 { 73 try 74 { 75 while (true) 76 { 77 byte[] buffer = new byte[2048]; 78 //实际接收到的字节数 79 int r = socketSend.Receive(buffer); 80 if (r == 0) 81 { 82 break; 83 } 84 else 85 { 86 //判断发送的数据的类型 87 if (buffer[0] == 0)//表示发送的是文字消息 88 { 89 string str = Encoding.Default.GetString(buffer, 1, r - 1); 90 this.txt_Log.Invoke(receiveCallBack, "接收远程服务器:" + socketSend.RemoteEndPoint + "发送的消息:" + str); 91 } 92 //表示发送的是文件 93 if (buffer[0] == 1) 94 { 95 SaveFileDialog sfd = new SaveFileDialog(); 96 sfd.InitialDirectory = @""; 97 sfd.Title = "请选择要保存的文件"; 98 sfd.Filter = "所有文件|*.*"; 99 sfd.ShowDialog(this); 100 101 string strPath = sfd.FileName; 102 using (FileStream fsWrite = new FileStream(strPath, FileMode.OpenOrCreate, FileAccess.Write)) 103 { 104 fsWrite.Write(buffer, 1, r - 1); 105 } 106 107 MessageBox.Show("保存文件成功"); 108 } 109 } 110 111 112 } 113 } 114 catch (Exception ex) 115 { 116 MessageBox.Show("接收服务端发送的消息出错:" + ex.ToString()); 117 } 118 } 119 120 121 private void SetValue(string strValue) 122 { 123 this.txt_Log.AppendText(strValue + "\r \n"); 124 } 125 126 /// <summary> 127 /// 客户端给服务器发送消息 128 /// </summary> 129 /// <param name="sender"></param> 130 /// <param name="e"></param> 131 private void btn_Send_Click(object sender, EventArgs e) 132 { 133 try 134 { 135 string strMsg = this.txt_Msg.Text.Trim(); 136 byte[] buffer = new byte[2048]; 137 buffer = Encoding.Default.GetBytes(strMsg); 138 int receive = socketSend.Send(buffer); 139 } 140 catch (Exception ex) 141 { 142 MessageBox.Show("发送消息出错:" + ex.Message); 143 } 144 } 145 146 private void FrmClient_Load(object sender, EventArgs e) 147 { 148 Control.CheckForIllegalCrossThreadCalls = false; 149 } 150 151 /// <summary> 152 /// 断开连接 153 /// </summary> 154 /// <param name="sender"></param> 155 /// <param name="e"></param> 156 private void btn_CloseConnect_Click(object sender, EventArgs e) 157 { 158 //关闭socket 159 socketSend.Close(); 160 //终止线程 161 threadReceive.Abort(); 162 } 163 } 164 }