Managedwifi：有时，WlanConnectionNotification不被解雇

我有以下代码聆听到WiFi使用managedWifi API（http://managedwifi.codeplex.com/）Managedwifi：有时，WlanConnectionNotification不被解雇

public void wlanConnectionChangeHandler(Wlan.WlanNotificationData notifyData, Wlan.WlanConnectionNotificationData connNotifyData){ 
     string msg = String.Empty; 

     switch (notifyData.notificationSource) 
     { 
      case Wlan.WlanNotificationSource.ACM: 

       switch ((Wlan.WlanNotificationCodeAcm)notifyData.notificationCode) 
       { 
        case Wlan.WlanNotificationCodeAcm.ConnectionStart: 
         msg = "ConnectionStart"; 
         break; 

        case Wlan.WlanNotificationCodeAcm.ConnectionComplete: 
          msg = "ConnectionComplete"; 
          WlanClient client = new WlanClient(); 
          foreach (WlanClient.WlanInterface wlanIface in client.Interfaces) 
          { 
           Wlan.WlanAssociationAttributes conAttributes = wlanIface.CurrentConnection.wlanAssociationAttributes; 
           Wlan.Dot11Ssid ssid = conAttributes.dot11Ssid; 
           PhysicalAddress bssid = conAttributes.Dot11Bssid; 
           int rssi = wlanIface.RSSI; 

           msg += ". ssid: " + GetStringForSSID(ssid) + ". rssi: " + rssi.ToString() + ". MAC: " + bssid.ToString(); 
           break; 
          } 

         break; 

        case Wlan.WlanNotificationCodeAcm.Disconnecting: 
         msg = "Disconnecting"; 
         break; 

        case Wlan.WlanNotificationCodeAcm.Disconnected: 
         msg = "Disconnected"; 
         break; 

        default: 
         msg = "unknown notificationCode =" + notifyData.notificationCode; 
         break; 

       } 
       MessageBox.Show(msg + " for profile:" + connNotifyData.profileName); 
       break; 

      default: 
       //MessageBox.Show("irrelevant notification. Ignore"); 
       break; 
     } 
    } 

    static string GetStringForSSID(Wlan.Dot11Ssid ssid) 
    { 
     return Encoding.ASCII.GetString(ssid.SSID, 0, (int) ssid.SSIDLength); 
    } 

    private void registerWlanListener() 
    { 
     WlanClient client = new WlanClient(); 

     foreach (WlanClient.WlanInterface wlanIface in client.Interfaces) 
     { 
      string str = "Name=" + wlanIface.InterfaceName + ". State: "; 

      switch (wlanIface.InterfaceState) 
      { 
       case Wlan.WlanInterfaceState.NotReady: 
        str += "NotReady"; 
        break; 

       case Wlan.WlanInterfaceState.Disconnected: 
        str += "Disconnected"; 
        break; 

       case Wlan.WlanInterfaceState.Disconnecting: 
        str += "Disconnecting"; 
        break; 

       case Wlan.WlanInterfaceState.Connected: 
        str += "Connected"; 
        break; 
      } 

      wlanIface.WlanConnectionNotification += wlanConnectionChangeHandler; 
      MessageBox.Show(str + ". Listener registered"); 
     } 
    } 

    private void unregisterWlanListener() 
    { 
     WlanClient client = new WlanClient(); 

     foreach (WlanClient.WlanInterface wlanIface in client.Interfaces) 
     { 
      wlanIface.WlanConnectionNotification -= wlanConnectionChangeHandler; 
      MessageBox.Show(wlanIface.InterfaceName + ". Listener unregistered"); 
     } 
    }

连接/断开事件在开始时，我调用了registerWlanListener，在停止我的应用程序之前，我调用了unregisterWlanListener（）。我已经在win7以及win8平板电脑上测试了我的桌面应用程序，通过多次连接/断开wifi连接并尝试观察通知。这是两个平台上的问题：

大部分的时间，我的wlanConnectionChangeHandler被调用的WiFi连接/断开，一切工作正常。但是，在某些情况下，它根本不会被调用。什么会导致这一点？我注意到，在最初错过通知后，即使我继续连接/断开无线连接，我也无法收到任何进一步的通知。
在不同的场合，即使我删除了事件处理程序，仍然收到通知。我在删除这些事件处理程序时丢失了些什么？

谢谢。

来源

2013-01-16 user1631605

很明显，当我编写代码时，我并没有清楚地思考。问题是我的WlanClient客户端的本地范围。通过使它成为一个全局变量来修复它，并只实例化一次。/facepalm

来源

2013-01-16 16:58:27 user1631605

Managedwifi：有时，WlanConnectionNotification不被解雇

回答

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