在写 C# socket 的时候发现 socket 连接无法设置超时时间,需要15s才能超时返回。百度一下发现也没有实现的比较好的代码。
因此,才有了下面这段 socket 连接超时的代码,这段代码已经应用到实际的项目中,并且运行稳定。
如果你有更好的实现方案可以给我留言。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 | class Socket2 : IComunication { static IPEndPoint ipe; static byte [] sendBytes = new byte [1400]; static byte [] recBytes = new byte [1400]; volatile static Socket socket = null ; static System.Threading.Timer readTimer = null ; static int readOverTime; static bool ReadOK; static System.Threading.Timer connectTimer = null ; static int connectOverTime; public Socket2() { readTimer = new System.Threading.Timer(OnReadTimeUp, null , Timeout.Infinite, Timeout.Infinite); object obj = Global.Config.Read( "ReadOverTime" ); if (obj == null || ! int .TryParse(obj.ToString(), out readOverTime)) { readOverTime = 3000; } obj = Global.Config.Read( "ConnectOverTime" ); if (obj == null || ! int .TryParse(obj.ToString(), out connectOverTime)) { connectOverTime = 3000; } } private static void OnConnectTimeUp( object obj) { StateObject stateObject = (StateObject)obj; lock (connectTimer) { if (stateObject.socket != null ) { stateObject.socket.Close(); stateObject.socket = null ; socket = null ; } } } private static void OnReadTimeUp( object obj) { ReadOK = false ; socket.Close(); } public bool Start() { try { if (socket == null ) { string host = Global.Config.Read( "DriverIP" ).ToString(); int port = Convert.ToInt32(Global.Config.Read( "DriverPort" )); IPAddress ip = IPAddress.Parse(host); ipe = new IPEndPoint(ip, port); socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); socket.DontFragment = false ; socket.ExclusiveAddressUse = true ; socket.UseOnlyOverlappedIO = false ; socket.SendBufferSize = 1500; socket.ReceiveBufferSize = 1500; socket.ReceiveTimeout = readOverTime; socket.SendTimeout = readOverTime; // 设置连接超时计时器 StateObject so = new StateObject(); so.socket = socket; //socket.Connect(ipe); connectTimer = new System.Threading.Timer(OnConnectTimeUp, so, Timeout.Infinite, Timeout.Infinite); connectTimer.Change(connectOverTime, Timeout.Infinite); socket.BeginConnect(ipe, new AsyncCallback(ConnectCallback), so); autoEventConnect.WaitOne(); } return true ; } catch (SocketException e) { Global.log.Debug(e); socket.Close(); socket = null ; return false ; } catch (Exception e) { if (socket != null ) { socket.Close(); } socket = null ; return false ; } } AutoResetEvent autoEventConnect = new AutoResetEvent( false ); private void ConnectCallback(IAsyncResult ar) { // Retrieve the socket from the state object. StateObject stateObject = (StateObject)ar.AsyncState; lock (connectTimer) { try { if (stateObject.socket != null ) { // Complete the connection. stateObject.socket.EndConnect(ar); connectTimer.Change(Timeout.Infinite, Timeout.Infinite); connectTimer.Dispose(); } } catch (Exception e) { if (stateObject.socket != null ) { stateObject.socket.Close(); } stateObject.socket = null ; stateObject.reciveBuffer = null ; stateObject.sendBuffer = null ; stateObject = null ; } } autoEventConnect.Set(); } public bool Stop() { if (socket != null ) { socket.Close(); } socket = null ; return true ; } public bool Write() { try { if (socket != null ) { buildSendBytes(); socket.NoDelay = true ; int n = socket.Send(sendBytes, sendBytes.Length , SocketFlags.None); if (n != sendBytes.Length) { Global.log.Debug( "send error 需要发送的字节数 " + "实际发送的字节数" + sendBytes.Length + ":" +n); } return true ; } else { return false ; } } catch (Exception e) { Global.log.Debug( "Error Send" ); Global.log.Debug(e); if (socket != null ) { socket.Close(); socket = null ; } return false ; } } public bool Read() { try { if (socket != null ) { StateObject so = new StateObject(); so.socket = socket; so.reciveBuffer = recBytes; // 设置读超时计时器 readTimer.Change(readOverTime, Timeout.Infinite); socket.BeginReceive(recBytes, 0, recBytes.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), so); // 接受完成 autoEvent.WaitOne(); readTimer.Change(Timeout.Infinite, Timeout.Infinite); buildRecBytes(); // 需要添加读超时返回 false if (ReadOK == true ) { return true ; } else { return false ; } } else { return false ; } } catch (Exception e) { Global.log.Debug(e); return false ; } } AutoResetEvent autoEvent = new AutoResetEvent( false ); public class StateObject { public Socket socket = null ; public byte [] reciveBuffer = null ; public byte [] sendBuffer = null ; } volatile int bytesRecieved = 0; public void ReceiveCallback(IAsyncResult ar) { StateObject state = null ; try { // Retrieve the state object and the client socket // from the asynchronous state object. state = (StateObject)ar.AsyncState; // Read data from the remote device. int bytesRead = state.socket.EndReceive(ar); if (bytesRead > 1400) { Global.log.Debug( "bytesRead > 1400 :" + bytesRead); } if (bytesRead > 0) { bytesRecieved += bytesRead; if (bytesRecieved < recBytes.Length) { state.socket.BeginReceive(state.reciveBuffer, bytesRecieved, state.reciveBuffer.Length - bytesRecieved, SocketFlags.None, new AsyncCallback(ReceiveCallback), state); } if (bytesRecieved == recBytes.Length) { bytesRecieved = 0; ReadOK = true ; autoEvent.Set(); } } else { state.socket.Close(); state.socket = null ; socket = null ; state.reciveBuffer = null ; state.sendBuffer = null ; state = null ; ReadOK = false ; autoEvent.Set(); } } catch (Exception e) { Global.log.Debug( "Error Recieve" ); Global.log.Debug(e); if (state.socket != null ) { state.socket.Close(); state.socket = null ; socket = null ; } state.reciveBuffer = null ; state.sendBuffer = null ; state = null ; ReadOK = false ; autoEvent.Set(); } } public bool ReadArray() { throw new NotImplementedException(); } public bool WriteArray() { throw new NotImplementedException(); } } |
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