SpeechRecognitionEngine.RecognizeAsyncCancel Método

Definição

Namespace:

System.Speech.Recognition

Assembly:

System.Speech.dll

Pacote:

System.Speech v9.0.0-preview.3.24172.9

Origem:

SpeechRecognitionEngine.cs

Encerra o reconhecimento assíncrono sem esperar que a operação de reconhecimento atual seja concluída.

public:
 void RecognizeAsyncCancel();

public void RecognizeAsyncCancel ();

member this.RecognizeAsyncCancel : unit -> unit

Public Sub RecognizeAsyncCancel ()

Exemplos

O exemplo a seguir mostra parte de um aplicativo de console que demonstra o uso do RecognizeAsyncCancel método . O exemplo cria e carrega uma gramática de reconhecimento de fala, inicia uma operação de reconhecimento assíncrono contínua e pausa 2 segundos antes de cancelar a operação. O reconhecedor recebe entrada do arquivo c:\temp\audioinput\sample.wav. Manipuladores de eventos são incluídos para demonstrar os eventos gerados pelo reconhecedor durante a operação.

using System;  
using System.Globalization;  
using System.Speech.Recognition;  
using System.Threading;  

namespace AsynchronousRecognition  
{  
  class Program  
  {  
    // Indicate whether asynchronous recognition is complete.  
    static bool completed;  

    static void Main(string[] args)  
    {  
      // Create an in-process speech recognizer.  
      using (SpeechRecognitionEngine recognizer =  
        new SpeechRecognitionEngine(new CultureInfo("en-US")))  
      {  
        // Create and load a dictation grammar.  
        Grammar dictation = new DictationGrammar();  
        dictation.Name = "Dictation Grammar";  

        recognizer.LoadGrammar(dictation);  

        // Attach event handlers.  
        recognizer.SpeechDetected +=  
          new EventHandler<SpeechDetectedEventArgs>(  
            SpeechDetectedHandler);  
        recognizer.SpeechHypothesized +=  
          new EventHandler<SpeechHypothesizedEventArgs>(  
            SpeechHypothesizedHandler);  
        recognizer.SpeechRecognitionRejected +=  
          new EventHandler<SpeechRecognitionRejectedEventArgs>(  
            SpeechRecognitionRejectedHandler);  
        recognizer.SpeechRecognized +=  
          new EventHandler<SpeechRecognizedEventArgs>(  
            SpeechRecognizedHandler);  
        recognizer.RecognizeCompleted +=  
          new EventHandler<RecognizeCompletedEventArgs>(  
            RecognizeCompletedHandler);  

        // Begin asynchronous recognition from pre-recorded input.  
        recognizer.SetInputToWaveFile(@"c:\temp\audioinput\sample.wav");  

        completed = false;  
        Console.WriteLine("Begin continuing asynchronous recognition...");  
        recognizer.RecognizeAsync(RecognizeMode.Multiple);  

        // Wait 2 seconds and then cancel the recognition operation.  
        Thread.Sleep(TimeSpan.FromSeconds(2));  
        recognizer.RecognizeAsyncCancel();  

        // Wait for the operation to complete.  
        while (!completed)  
        {  
          Thread.Sleep(333);  
        }  

        Console.WriteLine("Done.");  
      }  

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

    // Handle the SpeechDetected event.  
    static void SpeechDetectedHandler(object sender, SpeechDetectedEventArgs e)  
    {  
      Console.WriteLine(" In SpeechDetectedHandler:");  
      Console.WriteLine(" - AudioPosition = {0}", e.AudioPosition);  
    }  

    // Handle the SpeechHypothesized event.  
    static void SpeechHypothesizedHandler(  
      object sender, SpeechHypothesizedEventArgs e)  
    {  
      Console.WriteLine(" In SpeechHypothesizedHandler:");  

      string grammarName = "<not available>";  
      string resultText = "<not available>";  
      if (e.Result != null)  
      {  
        if (e.Result.Grammar != null)  
        {  
          grammarName = e.Result.Grammar.Name;  
        }  
        resultText = e.Result.Text;  
      }  

      Console.WriteLine(" - Grammar Name = {0}; Result Text = {1}",  
        grammarName, resultText);  
    }  

    // Handle the SpeechRecognitionRejected event.  
    static void SpeechRecognitionRejectedHandler(  
      object sender, SpeechRecognitionRejectedEventArgs e)  
    {  
      Console.WriteLine(" In SpeechRecognitionRejectedHandler:");  

      string grammarName = "<not available>";  
      string resultText = "<not available>";  
      if (e.Result != null)  
      {  
        if (e.Result.Grammar != null)  
        {  
          grammarName = e.Result.Grammar.Name;  
        }  
        resultText = e.Result.Text;  
      }  

      Console.WriteLine(" - Grammar Name = {0}; Result Text = {1}",  
        grammarName, resultText);  
    }  

    // Handle the SpeechRecognized event.  
    static void SpeechRecognizedHandler(  
      object sender, SpeechRecognizedEventArgs e)  
    {  
      Console.WriteLine(" In SpeechRecognizedHandler.");  

      string grammarName = "<not available>";  
      string resultText = "<not available>";  
      if (e.Result != null)  
      {  
        if (e.Result.Grammar != null)  
        {  
          grammarName = e.Result.Grammar.Name;  
        }  
        resultText = e.Result.Text;  
      }  

      Console.WriteLine(" - Grammar Name = {0}; Result Text = {1}",  
        grammarName, resultText);  
    }  

    // Handle the RecognizeCompleted event.  
    static void RecognizeCompletedHandler(  
      object sender, RecognizeCompletedEventArgs e)  
    {  
      Console.WriteLine(" In RecognizeCompletedHandler.");  

      if (e.Error != null)  
      {  
        Console.WriteLine(  
          " - Error occurred during recognition: {0}", e.Error);  
        return;  
      }  
      if (e.Cancelled)  
      {  
        Console.WriteLine(" - asynchronous operation canceled.");  
      }  
      if (e.InitialSilenceTimeout || e.BabbleTimeout)  
      {  
        Console.WriteLine(  
          " - BabbleTimeout = {0}; InitialSilenceTimeout = {1}",  
          e.BabbleTimeout, e.InitialSilenceTimeout);  
        return;  
      }  
      if (e.InputStreamEnded)  
      {  
        Console.WriteLine(  
          " - AudioPosition = {0}; InputStreamEnded = {1}",  
          e.AudioPosition, e.InputStreamEnded);  
      }  
      if (e.Result != null)  
      {  
        Console.WriteLine(  
          " - Grammar = {0}; Text = {1}; Confidence = {2}",  
          e.Result.Grammar.Name, e.Result.Text, e.Result.Confidence);  
      }  
      else  
      {  
        Console.WriteLine(" - No result.");  
      }  

      completed = true;  
    }  
  }  
}  

Comentários

Esse método finaliza imediatamente o reconhecimento assíncrono. Se a operação de reconhecimento assíncrona atual estiver recebendo entrada, a entrada será truncada e a operação será concluída com a entrada existente. O reconhecedor aciona o RecognizeCompleted evento ou EmulateRecognizeCompleted quando uma operação assíncrona é cancelada e define a Cancelled propriedade do RecognizeCompletedEventArgs como true. Esse método cancela operações assíncronas iniciadas pelos RecognizeAsync métodos e EmulateRecognizeAsync .

Para interromper o reconhecimento assíncrono sem truncar a entrada, use o RecognizeAsyncStop método .

Confira também

• EmulateRecognizeAsync(String)
• RecognizeAsync()
• RecognizeAsyncStop()
• RecognizeCompleted
• EmulateRecognizeCompleted