如何从Windows 10创建者更新上运行的WPF应用程序注册BLE通知?
我正在尝试编写一个使用WinRT Bluetooth LE API(Windows.Devices.Bluetooth命名空间)的C#应用程序。该应用程序是Windows经典桌面应用程序(WPF,而不是 UWP)。在创作者更新之前运行Windows 10版本时,这些API按预期运行。但是,运行创作者更新时,应将数据发送到蓝牙设备的API不起作用。具体来说,有以下方法返回成功状态码,但不要通过蓝牙无线电的任何数据(比如使用蓝牙流量嗅探器验证):如何从Windows 10创建者更新上运行的WPF应用程序注册BLE通知?
- GattCharacteristic.WriteClientCharacteristicConfigurationDescriptorWithResultAsync
- GattCharacteristic.WriteValueAsync
因此,任何为特性注册ValueChanged处理程序的尝试都不起作用。由于注册不会发送到Bluetooth LE设备,因此应用程序不会收到通知。
我知道并非所有的UWP API都可以从非UWP应用程序中使用,但我希望有人已经成功开发了这种配置中的BLE应用程序(或者至少现在可以确认它是不可能的)。我能够在创作者更新之前连接并从BLE设备读取数据并将数据写入BLE设备,并且仅在此最新版本的Windows 10中才会出现上述问题。 (注意:示例代码中使用的Async API已添加到创作者更新中,之前版本的应用程序使用旧版BLE API,但在运行创作者更新时它们也不起作用。)
具体来说,我的问题是:给出了以下项目参考列表和示例代码,是否有任何我可以尝试在运行非UWP应用程序的创作者更新的Windows 10上使用Bluetooth LE连接?请注意,“将应用程序转换为UWP应用程序”的显而易见的答案对我们来说不起作用,因为我们以UWP沙箱内无法实现的方式与其他硬件和文件进行交互。
该项目具有以下引用配置:
- System.Runtime.WindowsRuntime,在发现:C:\ Program Files文件(x86)的\参考大会\微软\ Framework.NETCore \ V4.5 \ System.Runtime.WindowsRuntime.dll
- Windows中,发现:C:\ Program Files文件(x86)的\的Windows套件\ 10 \ UnionMetadata \外观\ Windows.WinMD
- Windows.Foundation.FoundationContract,在发现:C: \ Program Files(x86)\ Windows Kits \ 10 \ References \ 10.0.15063.0 \ Windows.Foundation.FoundationContract \ 3.0.0.0 \ Windows.Foundation.FoundationContract.winmd
- Windows.Foundation.UniversalApiContract,找到在:C:\ Program Files文件(x86)\ Windows Kits \ 10 \ References \ 10.0.15063.0 \ Windows.Foundation.UniversalApiContract \ 4.0.0.0 \ Windows.Foundation.UniversalApiContract.winmd
以下是我的应用程序中非常简洁的蓝牙代码版本。需要注意的是很多的错误处理和这种已为清楚起见删除,但它应该给的什么,我试图做一个总体思路:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Devices.Bluetooth;
using Windows.Devices.Bluetooth.GenericAttributeProfile;
using Windows.Devices.Enumeration;
using Windows.Foundation;
using Windows.Storage.Streams;
using System.Threading;
namespace BLEMinimumApp
{
class Program
{
private List<string> foundDevices = new List<string>(5);
static void Main(string[] args)
{
new Program().Execute();
}
private void Execute()
{
Console.WriteLine("Starting device watcher...");
string[] requestedProperties = { "System.Devices.Aep.IsConnected" };
String query = "";
//query for Bluetooth LE devices
query += "(System.Devices.Aep.ProtocolId:=\"{bb7bb05e-5972-42b5-94fc-76eaa7084d49}\")";
//query for devices with controllers' name
query += " AND (System.ItemNameDisplay:=\"GPLeft\" OR System.ItemNameDisplay:=\"GPRight\")";
var deviceWatcher = DeviceInformation.CreateWatcher(query, requestedProperties, DeviceInformationKind.AssociationEndpoint);
deviceWatcher.Added += DeviceWatcher_OnAdded;
deviceWatcher.Start();
Console.ReadLine();
}
private async void DeviceWatcher_OnAdded(DeviceWatcher sender, DeviceInformation deviceInfo)
{
lock (foundDevices)
{
if (foundDevices.Contains(deviceInfo.Name))
{
return;
}
foundDevices.Add(deviceInfo.Name);
}
Console.WriteLine($"[{deviceInfo.Name}] DeviceWatcher_OnAdded...");
await ConnectTo(deviceInfo);
}
private async Task ConnectTo(DeviceInformation deviceInfo)
{
try
{
// get the device
BluetoothLEDevice device = await BluetoothLEDevice.FromIdAsync(deviceInfo.Id);
Console.WriteLine($"[{device.Name}] Device found: connectionStatus={device?.ConnectionStatus}");
// get the GATT service
Thread.Sleep(150);
Console.WriteLine($"[{device.Name}] Get GATT Services");
var gattServicesResult = await device.GetGattServicesForUuidAsync(new Guid("<GUID REMOVED FOR SO POST"));
Console.WriteLine($"[{device.Name}] GATT services result: status={gattServicesResult?.Status}, count={gattServicesResult?.Services?.Count}, cx={device.ConnectionStatus}");
if (gattServicesResult == null
|| gattServicesResult.Status != GattCommunicationStatus.Success
|| gattServicesResult.Services == null
|| gattServicesResult.Services?.Count < 1)
{
Console.WriteLine($"[{device.Name}] Failed to find GATT service.");
return;
}
var service = gattServicesResult.Services[0];
Console.WriteLine($"[{device?.Name}] GATT service found: gattDeviceService={service.Uuid}");
// get the GATT characteristic
Thread.Sleep(150);
Console.WriteLine($"[{device.Name}] Get GATT characteristics");
var gattCharacteristicsResult = await service.GetCharacteristicsForUuidAsync(new Guid("<GUID REMOVED FOR SO POST>"));
Console.WriteLine($"[{device.Name}] GATT Characteristics result: status={gattCharacteristicsResult?.Status}, count={gattCharacteristicsResult?.Characteristics?.Count}, cx={device.ConnectionStatus}");
if (gattCharacteristicsResult == null
|| gattCharacteristicsResult.Status != GattCommunicationStatus.Success
|| gattCharacteristicsResult.Characteristics == null
|| gattCharacteristicsResult.Characteristics?.Count < 1)
{
Console.WriteLine($"[{device.Name}] Failed to find GATT characteristic.");
return;
}
var characteristic = gattCharacteristicsResult.Characteristics[0];
// register for notifications
Thread.Sleep(150);
characteristic.ValueChanged += (sender, args) =>
{
Console.WriteLine($"[{device.Name}] Received notification containing {args.CharacteristicValue.Length} bytes");
};
Console.WriteLine($"[{device.Name}] Writing CCCD...");
GattWriteResult result =
await characteristic.WriteClientCharacteristicConfigurationDescriptorWithResultAsync(GattClientCharacteristicConfigurationDescriptorValue.Notify);
Console.WriteLine($"[{device?.Name}] Characteristics write result: status={result.Status}, protocolError={result.ProtocolError}");
// send configuration to device
await SendConfiguration(device, characteristic);
}
catch (Exception ex) when((uint) ex.HResult == 0x800710df)
{
Console.WriteLine("bluetooth error 1");
// ERROR_DEVICE_NOT_AVAILABLE because the Bluetooth radio is not on.
}
}
private async Task SendConfiguration(BluetoothLEDevice device, GattCharacteristic characteristic)
{
if (characteristic != null)
{
var writer = new DataWriter();
// CONFIGURATION REMOVED, but this code writes device-specific bytes to the DataWriter
await SendMessage(device, characteristic, writer.DetachBuffer());
}
}
private async Task SendMessage(BluetoothLEDevice device, GattCharacteristic characteristic, IBuffer message)
{
if (characteristic != null && device.ConnectionStatus.Equals(BluetoothConnectionStatus.Connected) && message != null)
{
Console.WriteLine($"[{device.Name}] Sending message...");
GattCommunicationStatus result = await characteristic.WriteValueAsync(message);
Console.WriteLine($"[{device.Name}] Result: {result}");
}
}
}
}
COM安全可能阻止你的应用程序从接收通知。请参考下面的线索来获得解决方案。我建议使用注册表黑客。
我有一个类似的问题,并与上述注册表更改我的应用程序接收一些通知,并没有任何明显的理由停止。 浪费了很多时间在这个问题上,并等待来自微软的补丁。
最新的更新修正了这一点。您也可以使用Matt Beaver的指示来解决该问题,其他海报引用的链接。
基本上之一:
- 为应用程序指定的AppId。
- 呼叫CoInitializeSecurity在您的应用程序,让我们再打
感谢您的回应。按照vt08505链接的线程中描述的指定AppID似乎可以解决我们的问题。我还证实,这似乎在Windows内部人员程序(操作系统版本16278.1000)中可用的最新版本中得到解决。 –
感谢您的答复。我指定了该线程中描述的AppID,这似乎解决了该问题。还没有完成详尽的测试,看看通知是否停止,如你所描述的。希望不是。 :) –