c#使用ManagedWifi查看当前Wifi信号并选择wifi的示例

使用managedwifi查看当前wifi信号并选择wifi

using system;
using system.collections.generic;
using system.linq;
using system.text;
using nativewifi;

namespace wifiexample
{
    class wifimanager
    {
        //cmcc的wifissid
        public wifissid cmccwifissid;

        public wifimanager()
        {
            scanssid();
        }

        /// <summary>
        /// 将ssid转化成字符串
        /// </summary>
        static string getstringforssid(wlan.dot11ssid ssid)
        {
            return encoding.utf8.getstring(ssid.ssid, 0, (int)ssid.ssidlength);
        }

        /// <summary> 
        /// 枚举所有无线设备接收到的ssid 
        /// </summary> 
        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.dot11defaultauthalgorithm = network.dot11defaultauthalgorithm.tostring();
                    targetssid.dot11defaultcipheralgorithm = network.dot11defaultcipheralgorithm.tostring();
                    console.writeline(targetssid.ssid);
                    if (targetssid.ssid.tolower().equals("cmcc"))
                    {
                        cmccwifissid = targetssid;
                        return;
                    }
                }
            }
        } // enumssid 

        /// <summary> 
        /// 连接到cmcc
        /// </summary> 
        /// <param name="ssid"></param> 
        public void connecttocmcc()
        {
            // connects to a known network with wep security 
            string profilename = cmccwifissid.ssid; // this is also the ssid
            console.writeline("profilename" + profilename);
            cmccwifissid.wlaninterface.connect(wlan.wlanconnectionmode.profile, wlan.dot11bsstype.any, profilename);
        }

        /// <summary> 
        /// 字符串转hex 
        /// </summary> 
        /// <param name="str"></param> 
        /// <returns></returns> 
        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 wifimanager

    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;
    }

}
```

调用链接cmcc
===
```
wifimanager wm = new wifimanager();
wm.connecttocmcc();