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1 using System;
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2 using System.Net;
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3 using System.Net.Sockets;
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4 using System.Text;
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5 using System.Threading;
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6
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7 namespace Client.Sockets
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8 {
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9 public class AsynchronousClient
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10 {
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11 // The port number for the remote device.
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12 private const int Port = 11000;
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13
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14 // ManualResetEvent instances signal completion.
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15 private static readonly ManualResetEvent connectDone =
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16 new ManualResetEvent(false);
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17
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18 private static readonly ManualResetEvent sendDone =
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19 new ManualResetEvent(false);
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20
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21 private static readonly ManualResetEvent receiveDone =
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22 new ManualResetEvent(false);
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23
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24 // The response from the remote device.
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25 private static String response = String.Empty;
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26
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27 private static void StartClient()
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28 {
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29 // Connect to a remote device.
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30 try
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31 {
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32 // Establish the remote endpoint for the socket.
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33 // The name of the
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34 // remote device is "host.contoso.com".
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35 var ipHostInfo = Dns.GetHostEntry("host.contoso.com");
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36 var ipAddress = ipHostInfo.AddressList[0];
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37 var remoteEP = new IPEndPoint(ipAddress, Port);
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38
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39 // Create a TCP/IP socket.
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40 var client = new Socket(
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41 AddressFamily.InterNetwork,
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42 SocketType.Stream,
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43 ProtocolType.Tcp);
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44
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45 // Connect to the remote endpoint.
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46 client.BeginConnect(
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47 remoteEP,
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48 ConnectCallback,
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49 client);
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50
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51 connectDone.WaitOne();
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52
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53 // Send test data to the remote device.
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54 Send(client, "This is a test<EOF>");
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55 sendDone.WaitOne();
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56
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57 // Receive the response from the remote device.
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58 Receive(client);
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59 receiveDone.WaitOne();
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60
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61 // Write the response to the console.
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62 Console.WriteLine("Response received : {0}", response);
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63
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64 // Release the socket.
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65 client.Shutdown(SocketShutdown.Both);
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66 client.Close();
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67 }
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68 catch (Exception e)
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69 {
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70 Console.WriteLine(e.ToString());
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71 }
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72 }
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73
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74 private static void ConnectCallback(IAsyncResult ar)
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75 {
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76 try
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77 {
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78 // Retrieve the socket from the state object.
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79 var client = (Socket) ar.AsyncState;
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80
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81 // Complete the connection.
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82 client.EndConnect(ar);
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83
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84 Console.WriteLine(
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85 "Socket connected to {0}",
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86 client.RemoteEndPoint);
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87
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88 // Signal that the connection has been made.
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89 connectDone.Set();
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90 }
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91 catch (Exception e)
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92 {
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93 Console.WriteLine(e.ToString());
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94 }
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95 }
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96
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97 private static void Receive(Socket client)
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98 {
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99 try
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100 {
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101 // Create the state object.
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102 var state = new StateObject {WorkSocket = client};
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103
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104 // Begin receiving the data from the remote device.
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105 client.BeginReceive(state.Buffer, 0, StateObject.BufferSize, 0,
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106 ReceiveCallback, state);
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107 }
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108 catch (Exception e)
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109 {
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110 Console.WriteLine(e.ToString());
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111 }
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112 }
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113
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114 private static void ReceiveCallback(IAsyncResult ar)
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115 {
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116 try
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117 {
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118 // Retrieve the state object and the client socket
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119 // from the asynchronous state object.
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120 var state = (StateObject) ar.AsyncState;
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121 var client = state.WorkSocket;
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122
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123 // Read data from the remote device.
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124 var bytesRead = client.EndReceive(ar);
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125
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126 if (bytesRead > 0)
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127 {
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128 // There might be more data, so store the data received so far.
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129 state.Sb.Append(Encoding.ASCII.GetString(state.Buffer, 0, bytesRead));
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130
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131 // Get the rest of the data.
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132 client.BeginReceive(state.Buffer, 0, StateObject.BufferSize, 0,
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133 ReceiveCallback, state);
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134 }
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135 else
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136 {
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137 // All the data has arrived; put it in response.
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138 if (state.Sb.Length > 1)
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139 {
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140 response = state.Sb.ToString();
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141 }
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142 // Signal that all bytes have been received.
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143 receiveDone.Set();
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144 }
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145 }
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146 catch (Exception e)
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147 {
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148 Console.WriteLine(e.ToString());
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149 }
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150 }
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151
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152 private static void Send(Socket client, String data)
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153 {
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154 // Convert the string data to byte data using ASCII encoding.
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155 var byteData = Encoding.ASCII.GetBytes(data);
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156
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157 // Begin sending the data to the remote device.
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158 client.BeginSend(
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159 byteData,
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160 0,
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161 byteData.Length,
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162 0,
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163 SendCallback,
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164 client);
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165 }
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166
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167 private static void SendCallback(IAsyncResult ar)
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168 {
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169 try
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170 {
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171 // Retrieve the socket from the state object.
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172 var client = (Socket) ar.AsyncState;
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173
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174 // Complete sending the data to the remote device.
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175 var bytesSent = client.EndSend(ar);
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176 Console.WriteLine("Sent {0} bytes to server.", bytesSent);
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177
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178 // Signal that all bytes have been sent.
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179 sendDone.Set();
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180 }
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181 catch (Exception e)
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182 {
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183 Console.WriteLine(e.ToString());
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184 }
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185 }
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186 }
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187 } |
