ContinuousRecognitionSession.StartAsync（）返回＆＃34;访问被拒绝＆＃34;

Question

我尝试使用BackgroundApplication在Raspberry PI 3中实现语音重新配置。我使用UWP的SpeechRecognizer类。

调用此函数ContinuousRecognitionSession.StartAsync()

时出现此错误“访问被拒绝”

有什么问题？

代码是：

class Speech
{
    private static SpeechRecognizer speechRecognizer;
    public async static void Initialize()
    {
        speechRecognizer = new SpeechRecognizer();
        speechRecognizer.Constraints.Add(new SpeechRecognitionListConstraint(new List<String>() { "Hello" }, "Hello"));

        SpeechRecognitionCompilationResult compilationResult = await speechRecognizer.CompileConstraintsAsync();

        speechRecognizer.ContinuousRecognitionSession.ResultGenerated += ContinuousRecognitionSession_ResultGenerated;
    }

    private static void ContinuousRecognitionSession_ResultGenerated(SpeechContinuousRecognitionSession sender, SpeechContinuousRecognitionResultGeneratedEventArgs args)
    {
        throw new NotImplementedException();
    }

    public static async Task<bool> StartRecognition()
    {
        try
        {
            await speechRecognizer.ContinuousRecognitionSession.StartAsync();
        }
        catch (Exception eException)
        {
            return false;
        }

        return true;
    }
}

和

public sealed class StartupTask : IBackgroundTask
{
    BackgroundTaskDeferral _deferral;

    public async void Run(IBackgroundTaskInstance taskInstance)
    {
        _deferral = taskInstance.GetDeferral();
        Speech.Initialize();
        await Speech.StartRecognition();
    }
}

Answer 1

正如@TóthTibor所指出的，你需要在Package.appxmanifest中声明麦克风功能，如下所示：

  <Capabilities>
    <DeviceCapability Name="microphone" />
  </Capabilities>

有关详情，请参阅"Set the Microphone device capability"和"Enable device capabilities"。