WriteClientCharacteristicConfigurationDescriptorAsync重复
时间: 2024-01-14 13:04:09 浏览: 23
哦,你想知道关于C#中的WriteClientCharacteristicConfigurationDescriptorAsync方法的重复问题是什么吗?
我不太清楚你遇到了什么样的重复问题,因为这个方法通常用于BLE(低功耗蓝牙)通信中,用于写入客户端配置描述符(Client Characteristic Configuration Descriptor,简称CCCD),以启用或禁用通知或指示的接收。
如果你遇到了这个方法的重复调用问题,你可以检查你的代码是否有在事件处理程序中多次调用该方法,或者是否有其他地方也在调用该方法。另外,你还可以尝试在方法调用前添加一个检查,确保该方法上一次调用后已经完成,防止重复调用。
如果我的回答不符合你的问题,可以再详细描述一下你的问题,我会尽力帮忙解答。
相关问题
C# Windows 11 提供的 Bluetooth API实现蓝牙的扫描、配对、通信 例程
以下是一个 C# Windows 11 的示例代码,演示如何使用 Bluetooth API 实现蓝牙设备的扫描、配对、通信:
```csharp
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Windows.Devices.Bluetooth;
using Windows.Devices.Bluetooth.GenericAttributeProfile;
using Windows.Devices.Enumeration;
class Program
{
static BluetoothLEDevice device;
static GattCharacteristic characteristic;
static async Task Main(string[] args)
{
// 建立连接前,先扫描设备列表并选择要连接的设备
DeviceInformationCollection devices = await BluetoothLEDevice.GetDeviceSelector().FindAllAsync();
Console.WriteLine("Found devices:");
for (int i = 0; i < devices.Count; i++)
{
Console.WriteLine($"{i + 1}. {devices[i].Name}");
}
string selection = Console.ReadLine();
int selectedIndex;
if (!int.TryParse(selection, out selectedIndex) || selectedIndex < 1 || selectedIndex > devices.Count)
{
Console.WriteLine("Invalid selection.");
return;
}
DeviceInformation selectedDevice = devices[selectedIndex - 1];
// 连接设备并获取服务和特征
device = await BluetoothLEDevice.FromIdAsync(selectedDevice.Id);
GattDeviceServicesResult servicesResult = await device.GetGattServicesAsync();
if (servicesResult.Status != GattCommunicationStatus.Success)
{
Console.WriteLine($"Failed to get services. Status: {servicesResult.Status}");
return;
}
GattDeviceService service = servicesResult.Services[0];
GattCharacteristicsResult characteristicsResult = await service.GetCharacteristicsAsync();
if (characteristicsResult.Status != GattCommunicationStatus.Success)
{
Console.WriteLine($"Failed to get characteristics. Status: {characteristicsResult.Status}");
return;
}
characteristic = characteristicsResult.Characteristics[0];
// 订阅特征的值改变事件
characteristic.ValueChanged += Characteristic_ValueChanged;
GattCommunicationStatus status = await characteristic.WriteClientCharacteristicConfigurationDescriptorAsync(GattClientCharacteristicConfigurationDescriptorValue.Notify);
if (status != GattCommunicationStatus.Success)
{
Console.WriteLine($"Failed to subscribe to value changes. Status: {status}");
return;
}
// 等待用户输入并向设备写入数据
Console.WriteLine("Connected to device. Enter message to send: ");
string message = Console.ReadLine();
byte[] data = System.Text.Encoding.UTF8.GetBytes(message);
GattWriteResult writeResult = await characteristic.WriteValueAsync(data.AsBuffer());
if (writeResult.Status != GattCommunicationStatus.Success)
{
Console.WriteLine($"Failed to write value. Status: {writeResult.Status}");
return;
}
Console.WriteLine("Data sent. Press any key to exit.");
Console.ReadKey();
// 断开连接并清理资源
characteristic.ValueChanged -= Characteristic_ValueChanged;
await characteristic.WriteClientCharacteristicConfigurationDescriptorAsync(GattClientCharacteristicConfigurationDescriptorValue.None);
device.Dispose();
}
private static void Characteristic_ValueChanged(GattCharacteristic sender, GattValueChangedEventArgs args)
{
byte[] data = args.CharacteristicValue.ToArray();
string message = System.Text.Encoding.UTF8.GetString(data);
Console.WriteLine($"Received message: {message}");
}
}
```
此代码首先扫描蓝牙设备列表并让用户选择要连接的设备。然后它连接设备并获取服务和特征。接下来,它订阅特征值改变事件,并等待用户输入要发送的消息。一旦用户输入消息,它将其转换为字节数组并向特征写入数据。它还打印从设备接收到的任何消息。最后,当用户按下任何键时,它将断开连接并清理资源。
C# 用windows11的API实现 蓝牙键盘的链接、配对、数据接收
首先,您需要在C#中使用Windows 11的API来检测蓝牙设备。您可以使用Windows.Devices.Bluetooth命名空间中的BluetoothLEAdvertisementWatcher类来检测设备。以下是示例代码:
```csharp
using Windows.Devices.Bluetooth;
using Windows.Devices.Bluetooth.Advertisement;
BluetoothLEAdvertisementWatcher watcher = new BluetoothLEAdvertisementWatcher();
watcher.Received += OnAdvertisementReceived;
watcher.Start();
private void OnAdvertisementReceived(BluetoothLEAdvertisementWatcher watcher, BluetoothLEAdvertisementReceivedEventArgs eventArgs)
{
if (eventArgs.Advertisement.LocalName == "Your Keyboard Name")
{
// 设备已找到
// 停止扫描
watcher.Stop();
// 连接设备
BluetoothLEDevice device = await BluetoothLEDevice.FromBluetoothAddressAsync(eventArgs.BluetoothAddress);
// 配对设备
DevicePairingResult result = await device.DeviceInformation.Pairing.PairAsync();
// 检查配对是否成功
if (result.Status == DevicePairingResultStatus.Paired || result.Status == DevicePairingResultStatus.AlreadyPaired)
{
// 配对成功,开始数据接收
GattDeviceService service = await GattDeviceService.FromIdAsync(device.DeviceId);
GattCharacteristic characteristic = service.GetCharacteristics(new Guid("Characteristic UUID"))[0];
// 注册数据接收事件
characteristic.ValueChanged += OnCharacteristicValueChanged;
await characteristic.WriteClientCharacteristicConfigurationDescriptorAsync(GattClientCharacteristicConfigurationDescriptorValue.Notify);
}
}
}
private void OnCharacteristicValueChanged(GattCharacteristic sender, GattValueChangedEventArgs args)
{
// 接收到新数据
byte[] data = args.CharacteristicValue.ToArray();
// 处理数据
}
```
在此示例中,我们使用BluetoothLEAdvertisementWatcher类来查找设备。当找到设备时,我们停止扫描并尝试连接设备。如果设备未配对,则配对设备。接下来,我们获取设备服务和特征并注册数据接收事件。当接收到新数据时,我们使用OnCharacteristicValueChanged方法进行处理。
请注意,您需要替换示例代码中的“Your Keyboard Name”和“Characteristic UUID”以适应您的蓝牙键盘。
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