监听网络状态
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 | using System; using System.Threading; using System.Runtime.InteropServices; namespace NetWork { public sealed class NetworkHelper { #region 网络状态 /// <summary> /// 监听计时器 /// </summary> private Timer listenTimer; private static NetworkHelper instance; /// <summary> /// 监听间隔 /// </summary> const int LISTEN_TIME_SPAN = 50000; //IsNetworkAlive Description const int NETWORK_ALIVE_LAN = 1; const int NETWORK_ALIVE_WAN = 2; const int NETWORK_ALIVE_AOL = 4; const int FLAG_ICC_FORCE_CONNECTION = 1; private NetworkHelper() { } static NetworkHelper() { instance = new NetworkHelper(); } public static NetworkHelper GetNetworkHelperInstance() { return instance; } /// <summary> /// 检查网络是否连通,有延迟 /// </summary> /// <param name="connectionDescription"></param> /// <param name="reservedValue"></param> [DllImport( "wininet.dll" )] private extern static bool InternetGetConnectedState( out int connectionDescription, int reservedValue); /// <summary> /// /// </summary> /// <param name="lpszUrl">连接饿地址</param> /// <param name="dwFlags">FLAG_ICC_FORCE_CONNECTION</param> /// <param name="dwReserved">0</param> [DllImport( "wininet.dll" )] private extern static bool InternetCheckConnection( string lpszUrl, int dwFlags, int dwReserved); /// <summary> /// 检查网络是否连通,需要启动服务 /// </summary> /// <param name="connectionDescription"></param> [DllImport( "sensapi.dll" )] private extern static bool IsNetworkAlive( out int connectionDescription); /// <summary> /// 检查是否能建立Internet连接,VISTA不可用 /// </summary> /// <param name="dest"></param> /// <param name="ptr">0</param> [DllImport( "sensapi.dll" )] private extern static bool IsDestinationReachable( string dest, IntPtr ptr); /// <summary> /// 互联网是否可用 /// </summary> /// <returns></returns> public bool IsInternetAlive() { int status; //检查网络是否可用 if (IsNetworkAlive( out status)) { ////如果WAN可用,检查能否建立连接 //if (status == NETWORK_ALIVE_WAN) //{ if (InternetCheckConnection( "http://www.baidu.com" , FLAG_ICC_FORCE_CONNECTION, 0) || InternetCheckConnection( "http://www.sina.com.cn" , FLAG_ICC_FORCE_CONNECTION, 0) || InternetCheckConnection( "http://www.163.com" , FLAG_ICC_FORCE_CONNECTION, 0)) { return true ; //如果能建立连接返回TRUE } else return false ; //} //else // return false; } return false ; } /// <summary> /// /// </summary> /// <returns></returns> public int CheckIntertNet() { int status; int connectionDescription; //检查网络是否可用 if (IsNetworkAlive( out status)) { //如果WAN可用,检查能否建立连接 //if (status == NETWORK_ALIVE_WAN) //{ if (InternetGetConnectedState( out connectionDescription, 0)) { return 1; //如果能建立连接返回TRUE } else return 0; //} //else // return false; } return 0; } /// <summary> /// 为NetworkStatusChanged事件处理程序提供数据 /// </summary> public class NetworkChangedEventArgs : EventArgs { private bool Isnetworkalive; int Isnetworkalive_Int32; public NetworkChangedEventArgs( bool status) { Isnetworkalive = status; } public NetworkChangedEventArgs( int status) { Isnetworkalive_Int32 = status; } public bool IsNetworkAlive { get { return Isnetworkalive; } private set { Isnetworkalive = value; } } public int IsNetworkAlive_Int32 { get { return Isnetworkalive_Int32; } private set { Isnetworkalive_Int32 = value; } } } /// <summary> /// 表示NetworkStatusChanged事件的方法 /// </summary> public delegate void NetworkChangedEventHandler( object sender, NetworkChangedEventArgs e); /// <summary> /// 网络状态变更时触发的事件 /// </summary> public event NetworkChangedEventHandler NetworkStatusChanged; /// <summary> /// 网络状态变更时触发的事件 /// </summary> private void OnNetworkStatusChanged(NetworkChangedEventArgs e) { if (NetworkStatusChanged != null ) NetworkStatusChanged( this , e); } /// <summary> /// 监听网络状态 /// </summary> public void ListenNetworkStatus(SynchronizationContext context) { //获得当前网络状态,并通知 bool currentStatus = true ; //bool currentStatus = IsInternetAlive(); //OnNetworkStatusChanged(new NetworkChangedEventArgs(currentStatus)); //启动监听网络状态,LISTEN_TIME_SPAN秒钟检查一次,当状态变更时触发事件 AutoResetEvent autoEvent = new AutoResetEvent( false ); listenTimer = new Timer( delegate { bool tmpStatus = IsInternetAlive(); if (currentStatus != tmpStatus) { currentStatus = tmpStatus; context.Post( delegate { OnNetworkStatusChanged( new NetworkChangedEventArgs(currentStatus)); }, null ); //OnNetworkStatusChanged(new NetworkChangedEventArgs(currentStatus)); } } , autoEvent , 0 , LISTEN_TIME_SPAN); //autoEvent.WaitOne(5000, false); } /// <summary> /// 监听网络状态 /// </summary> public void ListenNetworkStatus(SynchronizationContext context, bool ? b) { //获得当前网络状态,并通知 int currentStatus = -1; OnNetworkStatusChanged( new NetworkChangedEventArgs(currentStatus)); //启动监听网络状态,LISTEN_TIME_SPAN秒钟检查一次,当状态变更时触发事件 AutoResetEvent autoEvent = new AutoResetEvent( false ); listenTimer = new Timer( delegate { int tmpStatus = CheckIntertNet(); if (currentStatus != tmpStatus) { currentStatus = tmpStatus; context.Post( delegate { OnNetworkStatusChanged( new NetworkChangedEventArgs(currentStatus)); }, null ); } } , autoEvent , 0 , LISTEN_TIME_SPAN); autoEvent.WaitOne(5000, false ); } /// <summary> /// 停止监听网络状态 /// </summary> public void CloseListenNetworkStatus() { listenTimer.Dispose(); } } #endregion } |
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