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RecognizeCompletedEventArgs.InputStreamEnded Property

Gets a value indicating whether the input stream ended.

Namespace:  System.Speech.Recognition
Assembly:  System.Speech (in System.Speech.dll)

public bool InputStreamEnded { get; }

Property Value

Type: System.Boolean
true if the recognizer no longer has audio input; otherwise, false.

The recognizer sets this property to true when a file provides the input stream for the recognizer and the end of the file is reached. The end of the input stream can coincide with a successful recognition operation. For more information about using a file as the input stream, see the SetInputToAudioStream and SetInputToWaveFile methods.

The following example performs asynchronous speech recognition on a speech recognition grammar, using the SpeechRecognitionEngine.RecognizeAsync method with the in-process recognizer. The example uses Choices and GrammarBuilder objects to create the speech recognition grammar before building it into a Grammar object. A handler for the SpeechRecognitionEngine.RecognizeCompleted event outputs information about the recognition operation to the console.

using System;
using System.Speech.Recognition;

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

      // Initialize a SpeechRecognitionEngine object and set its input.
      recognizer = new SpeechRecognitionEngine(new System.Globalization.CultureInfo("en-US"));
      recognizer.SetInputToDefaultAudioDevice();

      // Configure recognition parameters.
      recognizer.InitialSilenceTimeout = TimeSpan.FromSeconds(5.0);
      recognizer.BabbleTimeout = TimeSpan.FromSeconds(3.0);
      recognizer.EndSilenceTimeout = TimeSpan.FromSeconds(1.0);
      recognizer.EndSilenceTimeoutAmbiguous = TimeSpan.FromSeconds(1.0);

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

      // Add a handler for the RecognizeCompleted event.
      recognizer.RecognizeCompleted += 
        new EventHandler<RecognizeCompletedEventArgs>(recognizer_RecognizeCompleted);

      // Create a speech recognition grammar and build it into a Grammar object.
      Choices bankingMenu = new Choices(new string[] 
      { "Access accounts", "Transfer funds", "Pay bills", "Get loan balance" });
      GrammarBuilder banking = new GrammarBuilder(bankingMenu);
      Grammar bankGrammar = new Grammar(banking);
      bankGrammar.Name = "Banking Menu";
    
      // Load the Grammar objects to the recognizer.
      recognizer.LoadGrammarAsync(bankGrammar);

      // Start asynchronous, continuous recognition.
      recognizer.RecognizeAsync();

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

    // Handle the RecognizeCompleted event.
    static void recognizer_RecognizeCompleted(object sender, RecognizeCompletedEventArgs e)
    {
      if (e.Error != null)
      {
        Console.WriteLine(
          "RecognizeCompleted, error occurred during recognition: {0}", e.Error);
        return;
      }

      if (e.InitialSilenceTimeout || e.BabbleTimeout)
      {
        Console.WriteLine(
          "RecognizeCompleted: BabbleTimeout({0}), InitialSilenceTimeout({1}).",
          e.BabbleTimeout, e.InitialSilenceTimeout);
        return;
      }

      if (e.InputStreamEnded)
      {
        Console.WriteLine(
          "RecognizeCompleted: AudioPosition({0}), InputStreamEnded({1}).",
          e.AudioPosition, e.InputStreamEnded);
      }

      if (e.Result != null)
      {
        Console.WriteLine(
          "RecognizeCompleted: Grammar ({0}), Text ({1}), Confidence ({2}), AudioPosition ({3}).",
          e.Result.Grammar.Name, e.Result.Text, e.Result.Confidence, e.AudioPosition);
      }

      else
      {
        Console.WriteLine("RecognizeCompleted: No result.");
      } 
      
      Console.WriteLine();
      Console.WriteLine("Press any key to exit...");
      Console.ReadKey();
    }

    // Handle the LoadGrammarCompleted event. 
    static void recognizer_LoadGrammarCompleted(object sender, LoadGrammarCompletedEventArgs e)
    {
      string grammarName = e.Grammar.Name;
      bool grammarLoaded = e.Grammar.Loaded;
      bool grammarEnabled = e.Grammar.Enabled;

      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 and {2} enabled.", grammarName, 
        (grammarLoaded) ? "is" : "is not", (grammarEnabled) ? "is" : "is not");
    }
  }          
}

.NET Framework

Supported in: 4.5.3, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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