SpeechRecognizer.AudioStateChanged 事件

定义

命名空间:

System.Speech.Recognition

程序集:

System.Speech.dll

当音频中的状态更改正被识别器接收时发生。

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) 

事件类型

EventHandler<AudioStateChangedEventArgs>

示例

下面的示例使用事件的处理程序，在 AudioStateChanged AudioState 每次使用枚举的成员进行更改时将识别器的新写入控制台 AudioState 。

using System;  
using System.Speech.Recognition;  

namespace SampleRecognition  
{  
  class Program  
  {  
    private static SpeechRecognizer recognizer;  
    public static void Main(string[] args)  
    {  

      // Initialize a shared speech recognition engine.  
      recognizer = new SpeechRecognizer();  

        // Create and load a grammar.  
        Grammar dictation = new DictationGrammar();  
        dictation.Name = "Dictation Grammar";  
        recognizer.LoadGrammar(dictation);  

        // Attach event handlers.  
        recognizer.AudioStateChanged +=  
          new EventHandler<AudioStateChangedEventArgs>(recognizer_AudioStateChanged);  
        recognizer.SpeechRecognized +=  
          new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);  
        recognizer.StateChanged +=  
          new EventHandler<StateChangedEventArgs>(recognizer_StateChanged);  

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

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

    // 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();  
    }  

    // Put the recognizer into Listening mode.  
    static void recognizer_StateChanged(object sender, StateChangedEventArgs e)  
    {  
      if (e.RecognizerState != RecognizerState.Stopped)  
      {  
        Console.WriteLine();  
        recognizer.EmulateRecognizeAsync("Start listening");  
      }  
    }  
  }  
}  

注解

若要获取事件时的音频状态，请使用关联的的 AudioState 属性 AudioStateChangedEventArgs 。 若要获取识别器的当前音频状态，请使用识别器的 AudioState 属性。 有关音频状态的详细信息，请参阅 AudioState 枚举。

为事件创建委托时，需要 AudioStateChanged 标识将处理该事件的方法。 若要将事件与事件处理程序关联，请将该委托的一个实例添加到事件中。 除非移除了该委托，否则每当发生该事件时就会调用事件处理程序。 有关事件处理程序委托的详细信息，请参阅 事件和委托。

另请参阅

• AudioState
• AudioStateChangedEventArgs
• AudioState