SpeechRecognizer.StateChanged 事件

定義

命名空間:

System.Speech.Recognition

組件:

System.Speech.dll

套件:

System.Speech v9.0.0-rc.2.24473.5

來源:

SpeechRecognizer.cs

當 Windows 桌面語音技術辨識引擎的執行狀態變更時發生。

public:
 event EventHandler<System::Speech::Recognition::StateChangedEventArgs ^> ^ StateChanged;

public event EventHandler<System.Speech.Recognition.StateChangedEventArgs> StateChanged;

member this.StateChanged : EventHandler<System.Speech.Recognition.StateChangedEventArgs> 

Public Custom Event StateChanged As EventHandler(Of StateChangedEventArgs) 

事件類型

EventHandler<StateChangedEventArgs>

範例

下列範例會建立共用語音辨識器，然後建立兩種類型的文法來辨識特定單字，以及接受免費的聽寫。 此範例會以非同步方式將所有建立的文法載入至辨識器。 事件的處理常式 StateChanged 會使用 方法將 EmulateRecognizeAsync Windows 辨識置於「接聽」模式中。

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();  

      // Add a handler for the LoadGrammarCompleted event.  
      recognizer.LoadGrammarCompleted += new EventHandler<LoadGrammarCompletedEventArgs>(recognizer_LoadGrammarCompleted);  

      // Add a handler for the SpeechRecognized event.  
      recognizer.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);  

      // Add a handler for the StateChanged event.  
      recognizer.StateChanged += new EventHandler<StateChangedEventArgs>(recognizer_StateChanged);  

      // Create "yesno" grammar.  
      Choices yesChoices = new Choices(new string[] { "yes", "yup", "yah}" });  
      SemanticResultValue yesValue =  
          new SemanticResultValue(yesChoices, (bool)true);  
      Choices noChoices = new Choices(new string[] { "no", "nope", "nah" });  
      SemanticResultValue noValue = new SemanticResultValue(noChoices, (bool)false);  
      SemanticResultKey yesNoKey =  
          new SemanticResultKey("yesno", new Choices(new GrammarBuilder[] { yesValue, noValue }));  
      Grammar yesnoGrammar = new Grammar(yesNoKey);  
      yesnoGrammar.Name = "yesNo";  

      // Create "done" grammar.  
      Grammar doneGrammar =  
        new Grammar(new Choices(new string[] { "done", "exit", "quit", "stop" }));  
      doneGrammar.Name = "Done";  

      // Create dictation grammar.  
      Grammar dictation = new DictationGrammar();  
      dictation.Name = "Dictation";  

      // Load grammars to the recognizer.  
      recognizer.LoadGrammarAsync(yesnoGrammar);  
      recognizer.LoadGrammarAsync(doneGrammar);  
      recognizer.LoadGrammarAsync(dictation);  

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

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

    // Write the text of the recognized phrase to the console.  
    static void  recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)  
    {  
     Console.WriteLine("Grammar({0}): {1}", e.Result.Grammar.Name, e.Result.Text);  

      // Add event handler code here.  
    }  

    // Handle the LoadGrammarCompleted event.  
    static void  recognizer_LoadGrammarCompleted(object sender, LoadGrammarCompletedEventArgs e)  
    {  
     string grammarName = e.Grammar.Name;  
      bool grammarLoaded = e.Grammar.Loaded;  
      if (e.Error != null)  
      {  
        Console.WriteLine("LoadGrammar for {0} failed with a {1}.",  
        grammarName, e.Error.GetType().Name);  
      }  

      // Add exception handling code here.  
      Console.WriteLine("Grammar {0} {1} loaded.",  
      grammarName, (grammarLoaded) ? "is" : "is not");  
    }  
  }  
}  

備註

當 Windows 語音辨識的狀態變更為 Listening 或 Stopped 狀態時，共用辨識器會引發此事件。

若要在事件發生時取得共用辨識器的狀態，請使用 RecognizerState 相關聯 StateChangedEventArgs 的 屬性。 若要取得共用辨識器的目前狀態，請使用辨識器的 State 屬性。

當您建立 StateChanged 事件的委派時，您會識別將處理事件的方法。 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

• RecognizerState
• StateChangedEventArgs
• State