1，先说结论
本文介绍如何在winform、wpf中实现经典蓝牙扫描（同步方式和异步方式），以及实现基于win10的ble扫描。
接下来是一波废话：
由于公司业务需求，需要在windows桌面软件中实现蓝牙设备搜索功能。
一番摆渡后发现基本上用的都是Inthehand的，这个库只能搜索到bt3经典蓝牙，可以实现同步搜索和异步搜索。要想实现ble搜索需要基于win10 SDK进行开发，微软官方demo是基于uwp的，那么可以实现在winform/wpf中使用吗？经过一番操作，实现了在wpf中调动win10 SDK进行ble搜索，但是必须要在win10环境下运行。
2，Inthehand同步搜索
所谓同步搜索就是固定扫描一段时间（大概10s钟的样子），然后返回扫描到的所有蓝牙设备。
1，添加依赖
32feet.PNG
2，撸码
public partial class Bt3SyncScan : Window
{
private BluetoothClient blueClient;
public Bt3SyncScan()
{
InitializeComponent();
BluetoothRadio BuleRadio = BluetoothRadio.PrimaryRadio;
BuleRadio.Mode = RadioMode.Discoverable;
blueClient = new BluetoothClient();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
// 异步扫描
new Thread(() =>
{
IReadOnlyCollection<BluetoothDeviceInfo> Devices = blueClient.DiscoverDevices();
foreach (BluetoothDeviceInfo device in Devices)
{
//地址做一下美化
String addr = CommonUtil.btAddrFormat(device.DeviceAddress.ToString());
this.btnSearch.Dispatcher.Invoke(() =>
{
listBox.Items.Add(addr);
});
}
}).Start();
}
}
3，效果
1.gif
缺点比较明显，需要等几秒钟才展示结果。
3，Inthehand异步搜索
异步搜索和同步搜索使用的是相同的库。
1，撸码
public partial class Bt3AsyncScan : Window
{
private BluetoothClient bluetoothClient;
public Bt3AsyncScan()
{
InitializeComponent();
bluetoothClient = new BluetoothClient();
BluetoothRadio bluetoothRadio = BluetoothRadio.PrimaryRadio;
bluetoothRadio.Mode = RadioMode.Connectable;
}
private void Button_Click(object sender, RoutedEventArgs e)
{
BluetoothComponent bluetoothComponent = new BluetoothComponent(bluetoothClient);
// 开始异步扫描
bluetoothComponent.DiscoverDevicesAsync(10, false, false, false, true, bluetoothComponent);
// 扫描结果回调
bluetoothComponent.DiscoverDevicesProgress += BluetoothComponent_DiscoverDevicesProgress;
}
private void BluetoothComponent_DiscoverDevicesProgress(object sender, DiscoverDevicesEventArgs e)
{
string addr = e.Devices[0].DeviceAddress.ToString();
listBox.Items.Add(CommonUtil.btAddrFormat(addr));
}
}
2，效果
2.gif
可以看出每扫描到一个设备就展示出来，速度非常快。
4，基于winSDK的ble扫描
ble扫描可以扫描到ble设备，可以添加过滤条件，只搜索特定的设备，并且可以获取其信号强度。微软官方demo是基于uwp的，迁移到 wpf下，还是有点麻烦的。主要过程如下：
1，准备
需要你在win10环境下，并且vs安装了win10 SDK。
2，添加win10 SDK依赖
在你的wpf项目中添加如下引用
win10refer.PNG
如果你的项目中默认没有添加WindowsBase的话也要手动引入。
这三个依赖的参考位置如下：
C:\Windows Kits\10\UnionMetadata\10.0.17763.0\Windows.winmd
C:\Windows Kits\10\References\10.0.17763.0\Windows.Foundation.FoundationContract\3.0.0.0\Windows.Foundation.FoundationContract.winmd
C:\Program Files\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2\WindowsBase.dll
3，撸码
public partial class BleScan : Window
{
private BluetoothLEAdvertisementWatcher watcher;
private BluetoothLEManufacturerData manufacturerData;
public BleScan()
{
InitializeComponent();
initBluetooth();
}
private void initBluetooth()
{
watcher = new BluetoothLEAdvertisementWatcher();
var manufacturerData = new BluetoothLEManufacturerData();
manufacturerData.CompanyId = 0x014C;
var writer = new DataWriter();
writer.WriteUInt16(0x0719);
manufacturerData.Data = writer.DetachBuffer();
// 过滤条件：companyId = 0x014C 且值为：0x0719的广播。可自行修改或删除
watcher.AdvertisementFilter.Advertisement.ManufacturerData.Add(manufacturerData);
// 根据信号强度过滤
watcher.SignalStrengthFilter.InRangeThresholdInDBm = -50;
watcher.SignalStrengthFilter.OutOfRangeThresholdInDBm = -55;
watcher.SignalStrengthFilter.OutOfRangeTimeout = TimeSpan.FromMilliseconds(2000);
watcher.Received += OnAdvertisementReceived;
watcher.Stopped += OnAdvertisementWatcherStopped;
}
private void Button_Click(object sender, RoutedEventArgs e)
{
watcher.Start();
}
private async void OnAdvertisementReceived(BluetoothLEAdvertisementWatcher watcher, BluetoothLEAdvertisementReceivedEventArgs eventArgs)
{
// 信号强度
Int16 rssi = eventArgs.RawSignalStrengthInDBm;
// 蓝牙地址
string addr = CommonUtil.btAddrFormat2(eventArgs.BluetoothAddress.ToString("x8"));
string manufacturerDataString = "";
var manufacturerSections = eventArgs.Advertisement.ManufacturerData;
if (manufacturerSections.Count > 0)
{
// Only print the first one of the list
var manufacturerData = manufacturerSections[0];
var data = new byte[manufacturerData.Data.Length];
using (var reader = DataReader.FromBuffer(manufacturerData.Data))
{
reader.ReadBytes(data);
}
manufacturerDataString = BitConverter.ToString(data);
}
// Serialize UI update to the main UI thread
this.btnScan.Dispatcher.Invoke(() =>
{
listBox.Items.Add(String.Format("address:{0}, rssi:{1}, manufacturer:{2}", addr, rssi, manufacturerDataString));
});
}
private async void OnAdvertisementWatcherStopped(BluetoothLEAdvertisementWatcher watcher, BluetoothLEAdvertisementWatcherStoppedEventArgs eventArgs)
{
this.btnScan.Dispatcher.Invoke(() =>
{
});
}
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
watcher.Received -= OnAdvertisementReceived;
watcher.Stopped -= OnAdvertisementWatcherStopped;
watcher.Stop();
}
}
4，效果
3.gif
网友评论