SpeechRecognitionEngine.RecognizeAsyncCancel Methode

public:
 void RecognizeAsyncCancel();

public void RecognizeAsyncCancel();

member this.RecognizeAsyncCancel : unit -> unit

Public Sub RecognizeAsyncCancel ()

Voorbeelden

In het volgende voorbeeld ziet u een deel van een consoletoepassing waarin het gebruik van de RecognizeAsyncCancel methode wordt gedemonstreert. In het voorbeeld wordt een grammatica voor spraakherkenning gemaakt en geladen, wordt een continue asynchrone herkenningsbewerking gestart en wordt vervolgens 2 seconden onderbroken voordat de bewerking wordt geannuleerd. De recognizer ontvangt invoer van het bestand c:\temp\audioinput\sample.wav. Gebeurtenis-handlers zijn opgenomen om de gebeurtenissen te demonstreren die de recognizer genereert tijdens de bewerking.

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;
    }
  }
}

Opmerkingen

Deze methode voltooit onmiddellijk asynchrone herkenning. Als de huidige asynchrone herkenningsbewerking invoer ontvangt, wordt de invoer afgekapt en wordt de bewerking voltooid met de bestaande invoer. De recognizer genereert de RecognizeCompleted of gebeurtenis wanneer een asynchrone bewerking wordt geannuleerd en de Cancelled eigenschap van de RecognizeCompletedEventArgs bewerking wordt ingesteld op trueEmulateRecognizeCompleted . Met deze methode worden asynchrone bewerkingen geannuleerd die door de RecognizeAsync en EmulateRecognizeAsync methoden zijn gestart.

Als u asynchrone herkenning wilt stoppen zonder de invoer af te kapen, gebruikt u de RecognizeAsyncStop methode.

Zie ook

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