SpeechRecognitionEngine.AudioStateChanged 事件

定義

命名空間:

System.Speech.Recognition

組件:

System.Speech.dll

套件:

System.Speech v10.0.0

來源:

SpeechRecognitionEngine.cs

在 SpeechRecognitionEngine 所接收的音訊變更狀態時引發。

public:
 event EventHandler<System::Speech::Recognition::AudioStateChangedEventArgs ^> ^ AudioStateChanged;

public event EventHandler<System.Speech.Recognition.AudioStateChangedEventArgs> AudioStateChanged;

member this.AudioStateChanged : EventHandler<System.Speech.Recognition.AudioStateChangedEventArgs> 

Public Custom Event AudioStateChanged As EventHandler(Of AudioStateChangedEventArgs) 

事件類型

EventHandler<AudioStateChangedEventArgs>

範例

下列範例會 AudioStateChanged 使用 事件的處理常式，在每次變更辨識器時，使用列舉的成員 AudioState ，將辨識器的新功能 AudioState 寫入主控台。

using System;
using System.Speech.Recognition;

namespace SampleRecognition
{
  class Program
  {
    static void Main(string[] args)

    // Initialize an in-process speech recognition engine.
    {
      using (SpeechRecognitionEngine recognizer =
         new SpeechRecognitionEngine(new System.Globalization.CultureInfo("en-US")))
      {

        // Create and load a grammar.
        Choices animals = new Choices(new string[] { "cow", "pig", "goat" });
        GrammarBuilder farm = new GrammarBuilder("On this farm he had a");
        farm.Append(animals);
        Grammar farmAnimals = new Grammar(farm);
        farmAnimals.Name = "Farm";
        recognizer.LoadGrammar(farmAnimals);

        // Attach event handlers.
        recognizer.AudioStateChanged +=
          new EventHandler<AudioStateChangedEventArgs>(recognizer_AudioStateChanged);
        recognizer.SpeechRecognized +=
          new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);
        recognizer.LoadGrammarCompleted +=
          new EventHandler<LoadGrammarCompletedEventArgs>(recognizer_LoadGrammarCompleted);

        // Set the input to the recognizer.
        recognizer.SetInputToDefaultAudioDevice();

        // Start recognition.
        recognizer.RecognizeAsync();

        // Keep the console window open.
        Console.ReadLine();
      }
    }

    // Handle the LoadGrammarCompleted event.
    static void recognizer_LoadGrammarCompleted(object sender, LoadGrammarCompletedEventArgs e)
    {
      Console.WriteLine("Grammar loaded: " + e.Grammar.Name);
    }

    // Handle the SpeechRecognized event.
    static void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
    {
      if (e.Result != null && e.Result.Text != null)
      {
        Console.WriteLine();
        Console.WriteLine("  Recognized text =  {0}", e.Result.Text);
        Console.WriteLine();
      }
      else
      {
        Console.WriteLine("  Recognized text not available.");
      }

      Console.WriteLine();
      Console.WriteLine("Done.");
      Console.WriteLine();
      Console.WriteLine("Press any key to exit...");
      Console.ReadKey();
    }

    // Handle the AudioStateChanged event.
    static void recognizer_AudioStateChanged(object sender, AudioStateChangedEventArgs e)
    {
      Console.WriteLine("The new audio state is: " + e.AudioState);
    }
  }
}

備註

若要在事件發生時取得音訊狀態，請使用 AudioState 相關聯 AudioStateChangedEventArgs 的 屬性。 若要取得辨識器輸入的目前音訊狀態，請使用辨識器的 AudioState 屬性。 如需音訊狀態的詳細資訊，請參閱 AudioState 列舉。

當您建立 AudioStateChanged 委派 (Delegate) 時，就可以識別即將處理此事件的方法。 若要使事件與您的事件處理常式產生關聯，請將委派的執行個體 (Instance) 加入至事件。 除非您移除委派，否則每當事件發生時就會呼叫事件處理常式。 如需事件處理常式委派的詳細資訊，請參閱 事件和委派。

另請參閱

• AudioState
• AudioStateChangedEventArgs
• AudioState