使用ManagedWifi连接无线网络

自windows vista和windows XP SP2以后的版本，微软支持使用Native wifi API来连接和管理无线网络。不过官方文档中有句话：Ad hoc mode might not be available in future versions of Windows. Starting with Windows 8.1 and Windows Server 2012 R2, use Wi-Fi Direct instead.高级模式将不被支持。从Windows 8.1和Windows Server 2012 R2开始，请使用Wi-Fi Direct替代。这个我们暂时先不用理会。

Native wifi API可以的下载地址：http://download.csdn.net/detail/libby1984/9529224

下面是代码：

判断电脑是否连接上了网络：

        [DllImport("wininet")]private extern static bool InternetGetConnectedState(out int connectionDescription, int reservedValue);/// <summary>/// 检测本机是否联网/// </summary>/// <returns></returns>public static bool IsConnectedInternet(){int i = 0;if (InternetGetConnectedState(out i, 0)){//已联网return true;}else{//未联网return false;}}

扫描无线网络，首先实例化一个WlanClient的实例，遍历该实例中所有的WlanInterface。每一个WlanInterface 就是一个无线网络连接。然后遍历每个连接下搜索到的所有无线网络。如果WlanInterface的InterfaceState属性值为Connected，那么就表示该无线网络连接是当前连接的连接，如果想具体知道连接的是哪个无线网络，可以查看WlanInterface实例的CurrentConnection属性。下面代码中的WIFISSID类是记录netwoek参数的类，可以根据需要自己定义。

 /// <summary>  /// 枚举所有无线设备接收到的SSID  /// </summary>  private List<WIFISSID> ScanSSID(){WlanClient client = new WlanClient();List<WIFISSID> wifiList = new List<WIFISSID>();string conectedNetworkName = string.Empty;foreach (WlanClient.WlanInterface wlanIface in client.Interfaces){List<string> profileNames = new List<string>();// Lists all networks with WEP security  Wlan.WlanAvailableNetwork[] networks = wlanIface.GetAvailableNetworkList(0);foreach (Wlan.WlanAvailableNetwork network in networks){if (wlanIface.InterfaceState == Wlan.WlanInterfaceState.Connected && wlanIface.CurrentConnection.isState == Wlan.WlanInterfaceState.Connected){conectedNetworkName = wlanIface.CurrentConnection.profileName;}WIFISSID targetSSID = new WIFISSID();if (network.networkConnectable){targetSSID.SSID = network.dot11Ssid;if (string.IsNullOrEmpty(network.profileName)){targetSSID.profileNames = GetStringForSSID(network.dot11Ssid);}else{targetSSID.profileNames = network.profileName;}if (!profileNames.Contains(targetSSID.profileNames)){profileNames.Add(targetSSID.profileNames);targetSSID.wlanInterface = wlanIface;targetSSID.wlanSignalQuality = (int)network.wlanSignalQuality;targetSSID.dot11DefaultAuthAlgorithm = network.dot11DefaultAuthAlgorithm;targetSSID.dot11DefaultCipherAlgorithm = network.dot11DefaultCipherAlgorithm.ToString();targetSSID.securityEnabled = network.securityEnabled;wifiList.Add(targetSSID);if (!string.IsNullOrEmpty(conectedNetworkName) && conectedNetworkName.Equals(network.profileName)){targetSSID.connected = true;}else{targetSSID.connected = false;}}}}}return wifiList;}public class WIFISSID
{public string profileNames;public Wlan.Dot11Ssid SSID;public NativeWifi.Wlan.Dot11AuthAlgorithm dot11DefaultAuthAlgorithm;public string dot11DefaultCipherAlgorithm = "";public bool networkConnectable = true;public string wlanNotConnectableReason = "";public int wlanSignalQuality = 0;public WlanClient.WlanInterface wlanInterface = null;public bool securityEnabled;public bool connected = false;
}

寻找当前连接的网络：

   public static string GetCurrentConnection(){WlanClient client = new WlanClient();foreach (WlanClient.WlanInterface wlanIface in client.Interfaces){Wlan.WlanAvailableNetwork[] networks = wlanIface.GetAvailableNetworkList(0);foreach (Wlan.WlanAvailableNetwork network in networks){if (wlanIface.InterfaceState == Wlan.WlanInterfaceState.Connected && wlanIface.CurrentConnection.isState == Wlan.WlanInterfaceState.Connected){return wlanIface.CurrentConnection.profileName;}}}return string.Empty;}

连接到无线网络。连接到无线网络需要传无线网络配置文件，这个配置文件是一个XML，根据不同的网络配置文件中的参数不同。

下面的例子中的infoTB是界面上的一个TextBlock控件，用来显示提示信息，而Loger类是一个自定义类。各位可以根据自己的需要对显示提示信息的部分进行修改。

 /// <summary> /// 连接到无线网络/// </summary> /// <param name="ssid"></param> public void ConnectToSSID(WIFISSID ssid, string key) { try {String auth = string.Empty;String cipher = string.Empty; bool isNoKey = false;String keytype = string.Empty; switch (ssid.dot11DefaultAuthAlgorithm) { case Wlan.Dot11AuthAlgorithm.IEEE80211_Open: auth = "open"; break; //case Wlan.Dot11AuthAlgorithm.IEEE80211_SharedKey: // 'not implemented yet; //break; case Wlan.Dot11AuthAlgorithm.RSNA: auth = "WPA2PSK"; break; case Wlan.Dot11AuthAlgorithm.RSNA_PSK: auth = "WPA2PSK"; break; case Wlan.Dot11AuthAlgorithm.WPA: auth = "WPAPSK"; break; case Wlan.Dot11AuthAlgorithm.WPA_None: auth = "WPAPSK"; break; case Wlan.Dot11AuthAlgorithm.WPA_PSK: auth = "WPAPSK"; break; } switch (ssid.dot11DefaultCipherAlgorithm) { case Wlan.Dot11CipherAlgorithm.CCMP: cipher = "AES"; keytype = "passPhrase"; break; case Wlan.Dot11CipherAlgorithm.TKIP: cipher = "TKIP"; keytype = "passPhrase";break; case Wlan.Dot11CipherAlgorithm.None: cipher = "none"; keytype = ""; isNoKey = true; break; case Wlan.Dot11CipherAlgorithm.WEP: cipher = "WEP"; keytype = "networkKey"; break; case Wlan.Dot11CipherAlgorithm.WEP40: cipher = "WEP"; keytype = "networkKey"; break; case Wlan.Dot11CipherAlgorithm.WEP104:cipher = "WEP"; keytype = "networkKey"; break;}if (isNoKey && !string.IsNullOrEmpty(key)){infoTB.Text = "无法连接网络！";Loger.WriteLog("无法连接网络","SSID:" + this.ssid.SSID + "\r\n"+ "Dot11AuthAlgorithm:" + ssid.dot11DefaultAuthAlgorithm + "\r\n"+ "Dot11CipherAlgorithm:" + ssid.dot11DefaultAuthAlgorithm.ToString());return;}else if (!isNoKey && string.IsNullOrEmpty(key)){infoTB.Text = "无法连接网络！";Loger.WriteLog("无法连接网络","SSID:" + this.ssid.SSID + "\r\n"+ "Dot11AuthAlgorithm:" + ssid.dot11DefaultAuthAlgorithm + "\r\n"+ "Dot11CipherAlgorithm:" + ssid.dot11DefaultAuthAlgorithm.ToString());return;}else{string profileName = ssid.profileNames; // this is also the SSID string mac = StringToHex(profileName);string profileXml = string.Empty;if (!string.IsNullOrEmpty(key)){profileXml = string.Format("<?xml version=\"1.0\"?><WLANProfile xmlns=\"http://www.microsoft.com/networking/WLAN/profile/v1\"><name>{0}</name><SSIDConfig><SSID><hex>{1}</hex><name>{0}</name></SSID></SSIDConfig><connectionType>ESS</connectionType><connectionMode>auto</connectionMode><autoSwitch>false</autoSwitch><MSM><security><authEncryption><authentication>{2}</authentication><encryption>{3}</encryption><useOneX>false</useOneX></authEncryption><sharedKey><keyType>{4}</keyType><protected>false</protected><keyMaterial>{5}</keyMaterial></sharedKey><keyIndex>0</keyIndex></security></MSM></WLANProfile>",profileName, mac, auth, cipher, keytype, key); }else{profileXml = string.Format("<?xml version=\"1.0\"?><WLANProfile xmlns=\"http://www.microsoft.com/networking/WLAN/profile/v1\"><name>{0}</name><SSIDConfig><SSID><hex>{1}</hex><name>{0}</name></SSID></SSIDConfig><connectionType>ESS</connectionType><connectionMode>auto</connectionMode><autoSwitch>false</autoSwitch><MSM><security><authEncryption><authentication>{2}</authentication><encryption>{3}</encryption><useOneX>false</useOneX></authEncryption></security></MSM></WLANProfile>",profileName, mac, auth, cipher, keytype); }ssid.wlanInterface.SetProfile(Wlan.WlanProfileFlags.AllUser, profileXml, true);//ssid.wlanInterface.Connect(Wlan.WlanConnectionMode.Profile, Wlan.Dot11BssType.Any, ssid.profileNames);bool success = ssid.wlanInterface.ConnectSynchronously(Wlan.WlanConnectionMode.Profile, Wlan.Dot11BssType.Any, profileName, 15000);if (!success){infoTB.Text = "连接网络失败！";Loger.WriteLog("连接网络失败","SSID:" + this.ssid.SSID + "\r\n"+ "Dot11AuthAlgorithm:" + ssid.dot11DefaultAuthAlgorithm + "\r\n"+ "Dot11CipherAlgorithm:" + ssid.dot11DefaultAuthAlgorithm.ToString() + "\r\n");return;}} } catch (Exception e) {infoTB.Text = "无法连接网络！" + e.Message;Loger.WriteLog("无法连接网络","SSID:" + this.ssid.SSID + "\r\n"+ "Dot11AuthAlgorithm:" + ssid.dot11DefaultAuthAlgorithm + "\r\n"+ "Dot11CipherAlgorithm:" + ssid.dot11DefaultAuthAlgorithm.ToString() + "\r\n"+ e.Message);return;} }

如果想要了解连接无线网络过程中的细节，可以注册WlanInterface的WlanConnectionNotification事件。该事件会对当连接的连接状态进行通知，下面是简单的通知事件的实现，根据通知的内容在界面上显示提示信息：

    private void WlanInterface_WlanConnectionNotification(Wlan.WlanNotificationData notifyData, Wlan.WlanConnectionNotificationData connNotifyData){try{this.Dispatcher.BeginInvoke(new Action(() =>{if (!this.ssid.profileNames.Equals(connNotifyData.profileName))  // 是否是当前SSID的通知{return;}if (notifyData.notificationSource == Wlan.WlanNotificationSource.ACM){int notificationCode = (int)notifyData.NotificationCode;switch (notificationCode){case (int)Wlan.WlanNotificationCodeAcm.ConnectionStart:Loger.WriteLog("开始连接无线网络" + this.ssid.profileNames);infoTB.Text = "开始连接无线网络......";break;case (int)Wlan.WlanNotificationCodeAcm.ConnectionComplete:Loger.WriteLog("连接无线网络成功" + this.ssid.profileNames);infoTB.Text = "连接无线网络成功！";this.DialogResult = true;break;case (int)Wlan.WlanNotificationCodeAcm.Disconnecting:Loger.WriteLog("正在断开无线网络连接" + this.ssid.profileNames);infoTB.Text = "正在断开无线网络连接......";break;case (int)Wlan.WlanNotificationCodeAcm.Disconnected:Loger.WriteLog("已经断开无线网络连接" + this.ssid.profileNames);infoTB.Text = "已经断开无线网络连接！";this.DialogResult = true;break;}}}));}catch (Exception e){Loger.WriteLog(e.Message);}}

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