C#编程使用Managed Wifi API连接无线SSID

如何用C#去操作无线网卡连接无线网络一直是个人学习过程中的一大困惑。好在最近成功解决了这个问题。最近在写一个中国电信ChinaNet无线热点自动连接工具，期间用到了Managed Wifi API，使用起来很是方便操作步骤很简单：

1.下载Managed Wifi API

关于Managed Wifi API：This project is a .NET class library allowing you to control Wifi (802.11) network adapters installed in your Windows machine programmatically.

The library uses the Native Wifi API, available since Windows Vista and Windows XP SP2 (in a limited fashion, and only after applying a hotfix provided in KB article 918997). Older versions of Windows are not supported.

 2.创建C#工程文件，并添加对ManagedWifi.dll的引用。

 

3.编写代码，引用“Native Wifi API”。

关键代码如下：

using System;
using System.Collections.Generic;
using System.Text;
using NativeWifi;
  
  
namespace ManagedWifiExample
{
    class MyWifi
    {
        public List ssids = new List();
  
        public MyWifi()
        {
            ssids.Clear();
        }
  
  
        static string GetStringForSSID(Wlan.Dot11Ssid ssid)
        {
            return Encoding.UTF8.GetString(ssid.SSID, 0, (int)ssid.SSIDLength);
        }
  
        /// 

        /// 枚举所有无线设备接收到的SSID
        /// 
        public void ScanSSID()
        {
            WlanClient client = new WlanClient();
            foreach (WlanClient.WlanInterface wlanIface in client.Interfaces)
            {
                // Lists all networks with WEP security
                Wlan.WlanAvailableNetwork[] networks = wlanIface.GetAvailableNetworkList(0);
                foreach (Wlan.WlanAvailableNetwork network in networks)
                {
                    WIFISSID targetSSID = new WIFISSID();
  
                    targetSSID.wlanInterface = wlanIface;
                    targetSSID.wlanSignalQuality = (int)network.wlanSignalQuality;
                    targetSSID.SSID = GetStringForSSID(network.dot11Ssid);
                    //targetSSID.SSID = Encoding.Default.GetString(network.dot11Ssid.SSID, 0, (int)network.dot11Ssid.SSIDLength);
                    targetSSID.dot11DefaultAuthAlgorithm = network.dot11DefaultAuthAlgorithm.ToString();
                    targetSSID.dot11DefaultCipherAlgorithm = network.dot11DefaultCipherAlgorithm.ToString();
                    ssids.Add(targetSSID);
  
                    //if ( network.dot11DefaultCipherAlgorithm == Wlan.Dot11CipherAlgorithm.WEP )
                    //{
                    //    Console.WriteLine( "Found WEP network with SSID {0}.", GetStringForSSID(network.dot11Ssid));
                    //}
                    //Console.WriteLine("Found network with SSID {0}.", GetStringForSSID(network.dot11Ssid));
                    //Console.WriteLine("dot11BssType:{0}.", network.dot11BssType.ToString());
                    //Console.WriteLine("dot11DefaultAuthAlgorithm:{0}.", network.dot11DefaultAuthAlgorithm.ToString());
                    //Console.WriteLine("dot11DefaultCipherAlgorithm:{0}.", network.dot11DefaultCipherAlgorithm.ToString());
                    //Console.WriteLine("dot11Ssid:{0}.", network.dot11Ssid.ToString());
  
                    //Console.WriteLine("flags:{0}.", network.flags.ToString());
                    //Console.WriteLine("morePhyTypes:{0}.", network.morePhyTypes.ToString());
                    //Console.WriteLine("networkConnectable:{0}.", network.networkConnectable.ToString());
                    //Console.WriteLine("numberOfBssids:{0}.", network.numberOfBssids.ToString());
                    //Console.WriteLine("profileName:{0}.", network.profileName.ToString());
                    //Console.WriteLine("wlanNotConnectableReason:{0}.", network.wlanNotConnectableReason.ToString());
                    //Console.WriteLine("wlanSignalQuality:{0}.", network.wlanSignalQuality.ToString());
                    //Console.WriteLine("-----------------------------------");
                    // Console.WriteLine(network.ToString());
                }
            }
        } // EnumSSID
  
  
        /// 

        /// 连接到未加密的SSID
        /// 
        /// 
        public void ConnectToSSID(WIFISSID ssid)
        {
            // Connects to a known network with WEP security
            string profileName = ssid.SSID; // this is also the SSID
  
            string mac = StringToHex(profileName); // 
  
            //string key = "";
            //string profileXml = string.Format("{0}{1}New{0}ESSopennonefalsenetworkKeyfalse{2}0", profileName, mac, key);
            //string profileXml2 = "Hacker SSID54502D4C494E4B5F506F636B657441505F433844323632TP-LINK_PocketAP_C8D262                ESSmanual opennonefalse";
            //wlanIface.SetProfile( Wlan.WlanProfileFlags.AllUser, profileXml2, true );
            //wlanIface.Connect( Wlan.WlanConnectionMode.Profile, Wlan.Dot11BssType.Any, profileName );
            string myProfileXML = string.Format("{0}{1}{0}ESSmanualopennonefalse", profileName, mac);
            ssid.wlanInterface.SetProfile(Wlan.WlanProfileFlags.AllUser, myProfileXML, true);
            ssid.wlanInterface.Connect(Wlan.WlanConnectionMode.Profile, Wlan.Dot11BssType.Any, profileName);
            //Console.ReadKey();
        }
  
        /// 

        /// 字符串转Hex
        /// 
        /// 
        /// 
        public static string StringToHex(string str)
        {
            StringBuilder sb = new StringBuilder();
            byte[] byStr = System.Text.Encoding.Default.GetBytes(str); //默认是System.Text.Encoding.Default.GetBytes(str)
            for (int i = 0; i < byStr.Length; i++)
            {
                sb.Append(Convert.ToString(byStr[i], 16));
            }
  
            return (sb.ToString().ToUpper());
        }
    }
  
    class WIFISSID
    {
        public string SSID = "NONE";
        public string dot11DefaultAuthAlgorithm = "";
        public string dot11DefaultCipherAlgorithm = "";
        public bool networkConnectable = true;
        public string wlanNotConnectableReason = "";
        public int wlanSignalQuality = 0;
        public WlanClient.WlanInterface wlanInterface = null;
    }
  
}

4.示例程序允许枚举当前网卡接收到的所有无线SSID，并支持接入开放认证（无密码）的无线热点。

5.其它

Wifi XML配置文件请参考微软文档

http://www.microsoft.com/networking/WLAN/profile/v1