c# 搜索蓝牙，获取信号强度

WinForm低功耗蓝牙通信BlueToothLE C# - mycls - 博客园

1.创建一个.net framework 4.6.1的wpf项目，4.6的不行，win7不支持蓝牙，网上很多方法都搞不定突然发现自己是4.6，改成4.6.1就成了，可能其他方法也是可以的

搜索到的蓝牙信号都是很奇怪的名字，也不支持搜索到手机蓝牙，后面再说吧

2.nuget安装  microsoft.windows.sdk.contracts，可以任意版本

3.将packages.config 迁移到 PackageReference

4.

using Windows.Devices.Enumeration;
using System.Threading;

上代码

public class BluetoothLEDev
    {
        private string _SearchBTName;
        /// <summary>
        /// 要查找的蓝牙名称
        /// </summary>
        public string SearchBTName
        {
            get { return _SearchBTName; }
            set { _SearchBTName = value; }
        }

        private int _SearchBTRssi;
        /// <summary>
        /// 查找的蓝牙名称对应的信号强度
        /// </summary>
        public int SearchBTRssi
        {
            get { return _SearchBTRssi; }
            set { _SearchBTRssi = value; }
        }

        /// <summary>
        /// 是否搜索停止了
        /// </summary>
        private bool _SearchStopped;
        public bool SearchStopped
        {
            get { return _SearchStopped; }
            set { _SearchStopped = value; }
        }

        public void ScanBluetooth(string BTName, int timeOut = 10)
        {
            SearchBTName = BTName;
            SearchStopped = false;

            string[] requestedProperties = { "System.Devices.Aep.IsConnected", "System.Devices.Aep.DeviceAddress",
                "System.Devices.Aep.Bluetooth.Le.IsConnectable", "System.Devices.Aep.SignalStrength",
                "System.Devices.Aep.IsPresent" };
            string aqsAllBluetoothLEDevices = "(System.Devices.Aep.ProtocolId:=\"{bb7bb05e-5972-42b5-94fc-76eaa7084d49}\")";

            DeviceWatcher deviceWatcher = DeviceInformation.CreateWatcher(aqsAllBluetoothLEDevices, requestedProperties,
                        DeviceInformationKind.AssociationEndpoint);

            deviceWatcher.Added += DeviceWatcher_Added;
            deviceWatcher.Updated += DeviceWatcher_Updated;
            deviceWatcher.Stopped += DeviceWatcher_Stopped;
            long TickTime = Environment.TickCount + timeOut * 1000;//系统经过的毫秒数
            Task.Factory.StartNew(() =>
            {
                while (true)
                {
                    if (Environment.TickCount > TickTime || SearchStopped)//找n秒或已经找到
                    {
                        string strTemp;
                        if (!SearchStopped)
                        {
                            strTemp = string.Format("时间到了呀-->{0}", timeOut);
                            //LogHelper.WriteLogInfo(strTemp);
                        }
                        strTemp = string.Format("结束搜索蓝牙");
                        //LogHelper.WriteLogInfo(strTemp);
                        deviceWatcher.Stop();
                        return;
                    }
                    else
                    {
                        Thread.Sleep(50);
                    }
                }
            });
            deviceWatcher.Start();
            //LogHelper.WriteLogInfo("开始搜索蓝牙");
        }

        private void DeviceWatcher_Added(DeviceWatcher sender, DeviceInformation args)
        {
            if (string.IsNullOrEmpty(args.Name))
            {
                return;
            }

            var rssi = args.Properties.Single(d => d.Key == "System.Devices.Aep.SignalStrength").Value;
            if (rssi == null)
            {
                return;
            }
            int IRssi = int.Parse(rssi.ToString());
            if (IRssi < -80)
            {
                return;
            }

            string strBTInfo = $"信号强度:[{IRssi}] 蓝牙名称:{(args.Name).PadRight(30, ' ')} 地址:{args.Id}";
            Console.WriteLine(strBTInfo);
            //LogHelper.WriteLogInfo(strBTInfo);

            if (args.Name.Contains(SearchBTName))
            {
                string strTemp = string.Format("搜索到蓝牙:{0},要查找的蓝牙名称:{1},信号强度:{2}找到了呀", args.Name, SearchBTName, IRssi);
               //LogHelper.WriteLogInfo(strTemp);
                SearchBTRssi = IRssi;
                SearchStopped = true;
            }
        }

        private void DeviceWatcher_Stopped(DeviceWatcher sender, object args)
        {
            SearchStopped = true;
        }

        private void DeviceWatcher_Updated(DeviceWatcher sender, DeviceInformationUpdate args)
        {
        }
    }

调用

        public static int SearchBluetoothGetRssi(string strBTName, int OutTime)
        {
            BluetoothLEDev BT = new BluetoothLEDev();
            BT.ScanBluetooth(strBTName, OutTime);

            long TickTime = Environment.TickCount + ((OutTime + 3) * 1000);//多3秒，防止另一个死机了这个退不出来  系统经过的毫秒数
            while (true)
            {
                if (Environment.TickCount > TickTime || BT.SearchStopped)//找n秒或已经找到
                {
                    LogHelper.WriteLogInfo("返回值:" + BT.SearchBTRssi.ToString());
                    return BT.SearchBTRssi;
                }
                else
                {
                    Thread.Sleep(50);
                }
            }
        }

 运行结果如图