本文转自： https://www.cnblogs.com/webtojs/p/9675956.html

winform 程序调用Windows.Devices.Bluetoot API 实现windows下BLE蓝牙设备自动连接，收发数据功能。不需要使用win10的UWP开发。

先贴图，回头来完善代码

源码如下：

using System.Threading.Tasks; using Windows.Devices.Bluetooth; using Windows.Devices.Bluetooth.GenericAttributeProfile; using Windows.Devices.Enumeration; using Windows.Foundation; using Windows.Security.Cryptography; namespace BLECode public class BluetoothLECode //存储检测的设备MAC。 public string CurrentDeviceMAC { get; set; } //存储检测到的设备。 public BluetoothLEDevice CurrentDevice { get; set; } //存储检测到的主服务。 public GattDeviceService CurrentService { get; set; } //存储检测到的写特征对象。 public GattCharacteristic CurrentWriteCharacteristic { get; set; } //存储检测到的通知特征对象。 public GattCharacteristic CurrentNotifyCharacteristic { get; set; } public string ServiceGuid { get; set; } public string WriteCharacteristicGuid { get; set; } public string NotifyCharacteristicGuid { get; set; } private const int CHARACTERISTIC_INDEX = 0; //特性通知类型通知启用 private const GattClientCharacteristicConfigurationDescriptorValue CHARACTERISTIC_NOTIFICATION_TYPE = GattClientCharacteristicConfigurationDescriptorValue.Notify; private Boolean asyncLock = false; private DeviceWatcher deviceWatcher; //定义一个委托 public delegate void eventRun(MsgType type, string str,byte[] data=null); //定义一个事件 public event eventRun ValueChanged; public BluetoothLECode(string serviceGuid, string writeCharacteristicGuid, string notifyCharacteristicGuid) ServiceGuid = serviceGuid; WriteCharacteristicGuid = writeCharacteristicGuid; NotifyCharacteristicGuid = notifyCharacteristicGuid; public void StartBleDeviceWatcher() string[] requestedProperties = { "System.Devices.Aep.DeviceAddress", "System.Devices.Aep.IsConnected", "System.Devices.Aep.Bluetooth.Le.IsConnectable" }; string aqsAllBluetoothLEDevices = "(System.Devices.Aep.ProtocolId:=\"{bb7bb05e-5972-42b5-94fc-76eaa7084d49}\")"; deviceWatcher = DeviceInformation.CreateWatcher( aqsAllBluetoothLEDevices, requestedProperties, DeviceInformationKind.AssociationEndpoint); // Register event handlers before starting the watcher. deviceWatcher.Added += DeviceWatcher_Added; deviceWatcher.Stopped += DeviceWatcher_Stopped; deviceWatcher.Start(); string msg = "自动发现设备中.."; ValueChanged(MsgType.NotifyTxt, msg); private void DeviceWatcher_Stopped(DeviceWatcher sender, object args) string msg = "自动发现设备停止"; ValueChanged(MsgType.NotifyTxt, msg); private void DeviceWatcher_Added(DeviceWatcher sender, DeviceInformation args) ValueChanged(MsgType.NotifyTxt, "发现设备:" + args.Id); if (args.Id.EndsWith(CurrentDeviceMAC)) Matching(args.Id); /// <summary> /// 按MAC地址查找系统中配对设备 /// </summary> /// <param name="MAC"></param> public async Task SelectDevice(string MAC) CurrentDeviceMAC = MAC; CurrentDevice = null; DeviceInformation.FindAllAsync(BluetoothLEDevice.GetDeviceSelector()).Completed = async (asyncInfo, asyncStatus) => if (asyncStatus == AsyncStatus.Completed) DeviceInformationCollection deviceInformation = asyncInfo.GetResults(); foreach (DeviceInformation di in deviceInformation) await Matching(di.Id); if (CurrentDevice == null) string msg = "没有发现设备"; ValueChanged(MsgType.NotifyTxt, msg); StartBleDeviceWatcher(); /// <summary> /// 按MAC地址直接组装设备ID查找设备 /// </summary> /// <param name="MAC"></param> /// <returns></returns> public async Task SelectDeviceFromIdAsync(string MAC) CurrentDeviceMAC = MAC; CurrentDevice = null; BluetoothAdapter.GetDefaultAsync().Completed = async (asyncInfo, asyncStatus) => if (asyncStatus == AsyncStatus.Completed) BluetoothAdapter mBluetoothAdapter = asyncInfo.GetResults(); byte[] _Bytes1 = BitConverter.GetBytes(mBluetoothAdapter.BluetoothAddress);//ulong转换为byte数组 Array.Reverse(_Bytes1); string macAddress = BitConverter.ToString(_Bytes1, 2, 6).Replace('-', ':').ToLower(); string Id = "BluetoothLE#BluetoothLE" + macAddress + "-" + MAC; await Matching(Id); private async Task Matching(string Id) BluetoothLEDevice.FromIdAsync(Id).Completed = async (asyncInfo, asyncStatus) => if (asyncStatus == AsyncStatus.Completed) BluetoothLEDevice bleDevice = asyncInfo.GetResults(); //在当前设备变量中保存检测到的设备。 CurrentDevice = bleDevice; await Connect(); catch (Exception e) string msg = "没有发现设备" + e.ToString(); ValueChanged(MsgType.NotifyTxt, msg); StartBleDeviceWatcher(); private async Task Connect() string msg = "正在连接设备<" + CurrentDeviceMAC + ">.."; ValueChanged(MsgType.NotifyTxt, msg); CurrentDevice.ConnectionStatusChanged += CurrentDevice_ConnectionStatusChanged; await SelectDeviceService(); /// <summary> /// 主动断开连接 /// </summary> /// <returns></returns> public void Dispose() CurrentDeviceMAC = null; CurrentService?.Dispose(); CurrentDevice?.Dispose(); CurrentDevice = null; CurrentService = null; CurrentWriteCharacteristic = null; CurrentNotifyCharacteristic = null; ValueChanged(MsgType.NotifyTxt, "主动断开连接"); private void CurrentDevice_ConnectionStatusChanged(BluetoothLEDevice sender, object args) if (sender.ConnectionStatus == BluetoothConnectionStatus.Disconnected && CurrentDeviceMAC != null) string msg = "设备已断开,自动重连"; ValueChanged(MsgType.NotifyTxt, msg); if (!asyncLock) asyncLock = true; CurrentDevice.Dispose(); CurrentDevice = null; CurrentService = null; CurrentWriteCharacteristic = null; CurrentNotifyCharacteristic = null; SelectDeviceFromIdAsync(CurrentDeviceMAC); string msg = "设备已连接"; ValueChanged(MsgType.NotifyTxt, msg); /// <summary> /// 按GUID 查找主服务 /// </summary> /// <param name="characteristic">GUID 字符串</param> /// <returns></returns> public async Task SelectDeviceService() Guid guid = new Guid(ServiceGuid); CurrentDevice.GetGattServicesForUuidAsync(guid).Completed = (asyncInfo, asyncStatus) => if (asyncStatus == AsyncStatus.Completed) GattDeviceServicesResult result = asyncInfo.GetResults(); string msg = "主服务=" + CurrentDevice.ConnectionStatus; ValueChanged(MsgType.NotifyTxt, msg); if (result.Services.Count > 0) CurrentService = result.Services[CHARACTERISTIC_INDEX]; if (CurrentService != null) asyncLock = true; GetCurrentWriteCharacteristic(); GetCurrentNotifyCharacteristic(); msg = "没有发现服务,自动重试中"; ValueChanged(MsgType.NotifyTxt, msg); SelectDeviceService(); catch (Exception e) ValueChanged(MsgType.NotifyTxt, "没有发现服务,自动重试中"); SelectDeviceService(); /// <summary> /// 设置写特征对象。 /// </summary> /// <returns></returns> public async Task GetCurrentWriteCharacteristic() string msg = ""; Guid guid = new Guid(WriteCharacteristicGuid); CurrentService.GetCharacteristicsForUuidAsync(guid).Completed = async (asyncInfo, asyncStatus) => if (asyncStatus == AsyncStatus.Completed) GattCharacteristicsResult result = asyncInfo.GetResults(); msg = "特征对象=" + CurrentDevice.ConnectionStatus; ValueChanged(MsgType.NotifyTxt, msg); if (result.Characteristics.Count > 0) CurrentWriteCharacteristic = result.Characteristics[CHARACTERISTIC_INDEX]; msg = "没有发现特征对象,自动重试中"; ValueChanged(MsgType.NotifyTxt, msg); await GetCurrentWriteCharacteristic(); if (CurrentWriteCharacteristic != null) CurrentWriteCharacteristic.WriteValueAsync(CryptographicBuffer.CreateFromByteArray(data), GattWriteOption.WriteWithResponse); /// <summary> /// 设置通知特征对象。 /// </summary> /// <returns></returns> public async Task GetCurrentNotifyCharacteristic() string msg = ""; Guid guid = new Guid(NotifyCharacteristicGuid); CurrentService.GetCharacteristicsForUuidAsync(guid).Completed = async (asyncInfo, asyncStatus) => if (asyncStatus == AsyncStatus.Completed) GattCharacteristicsResult result = asyncInfo.GetResults(); msg = "特征对象=" + CurrentDevice.ConnectionStatus; ValueChanged(MsgType.NotifyTxt, msg); if (result.Characteristics.Count > 0) CurrentNotifyCharacteristic = result.Characteristics[CHARACTERISTIC_INDEX]; CurrentNotifyCharacteristic.ProtectionLevel = GattProtectionLevel.Plain; CurrentNotifyCharacteristic.ValueChanged += Characteristic_ValueChanged; await EnableNotifications(CurrentNotifyCharacteristic); msg = "没有发现特征对象,自动重试中"; ValueChanged(MsgType.NotifyTxt, msg); await GetCurrentNotifyCharacteristic(); /// <summary> /// 设置特征对象为接收通知对象 /// </summary> /// <param name="characteristic"></param> /// <returns></returns> public async Task EnableNotifications(GattCharacteristic characteristic) string msg = "收通知对象=" + CurrentDevice.ConnectionStatus; ValueChanged(MsgType.NotifyTxt, msg); characteristic.WriteClientCharacteristicConfigurationDescriptorAsync(CHARACTERISTIC_NOTIFICATION_TYPE).Completed = async (asyncInfo, asyncStatus) => if (asyncStatus == AsyncStatus.Completed) GattCommunicationStatus status = asyncInfo.GetResults(); if (status == GattCommunicationStatus.Unreachable) msg = "设备不可用"; ValueChanged(MsgType.NotifyTxt, msg); if (CurrentNotifyCharacteristic != null && !asyncLock) await EnableNotifications(CurrentNotifyCharacteristic); asyncLock = false; msg = "设备连接状态" + status; ValueChanged(MsgType.NotifyTxt, msg); private void Characteristic_ValueChanged(GattCharacteristic sender, GattValueChangedEventArgs args) byte[] data; CryptographicBuffer.CopyToByteArray(args.CharacteristicValue, out data); string str = BitConverter.ToString(data); ValueChanged(MsgType.BLEData,str, data); public enum MsgType NotifyTxt, BLEData

调用方式：

           bluetooth = new BluetoothLECode(_serviceGuid, _writeCharacteristicGuid, _notifyCharacteristicGuid);
            bluetooth.ValueChanged += Bluetooth_ValueChanged; 

如果你无法编译上面的类库，请直接使用我生成的DLL文件

https://files.cnblogs.com/files/webtojs/BLECode.rar

本文转自：https://www.cnblogs.com/webtojs/p/9675956.htmlwinform 程序调用Windows.Devices.Bluetoot API 实现windows下BLE蓝牙设备自动连接，收发数据功能。不需要使用win10的UWP开发。先贴图，回头来完善代码 源码如下：using System;using System...