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EmulateRecognizeAsync Method (String)

SpeechRecognizer.EmulateRecognizeAsync Method (String)

Emulates input of a phrase to the shared speech recognizer, using text instead of audio for asynchronous speech recognition.

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

public void EmulateRecognizeAsync(
	string inputText
)

Parameters

inputText
Type: System.String

The input for the recognition operation.

The recognizers that ship with Vista and Windows 7 ignore case and character width when applying grammar rules to the input phrase. For more information about this type of comparison, see the CompareOptions enumeration values OrdinalIgnoreCase and IgnoreWidth. The recognizers also ignore new lines and extra white space and treat punctuation as literal input.

The following example is part of a console application that loads a speech recognition grammar and demonstrates asynchronous emulated input, the associated recognition results, and the associated events raised by the speech recognizer. If Windows Speech Recognition is not running, then starting this application will also start Windows Speech Recognition. If Windows Speech Recognition is in the Sleeping state, then EmulateRecognizeAsync always returns null.

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

namespace SharedRecognizer
{
  class Program
  {
    static bool completed;

    static void Main(string[] args)
    {
      // Initialize an instance of the shared recognizer.
      using (SpeechRecognizer recognizer = new SpeechRecognizer())
      {
        // Create and load a sample grammar.
        Grammar testGrammar =
          new Grammar(new GrammarBuilder("testing testing"));
        testGrammar.Name = "Test Grammar";

        recognizer.LoadGrammar(testGrammar);

        // Attach event handlers for recognition events.
        recognizer.SpeechRecognized +=
          new EventHandler<SpeechRecognizedEventArgs>(
            SpeechRecognizedHandler);
        recognizer.EmulateRecognizeCompleted +=
          new EventHandler<EmulateRecognizeCompletedEventArgs>(
            EmulateRecognizeCompletedHandler);

        completed = false;

        // This EmulateRecognizeAsync call generates a SpeechRecognized event.
        recognizer.EmulateRecognizeAsync("testing testing");

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

        completed = false;

        // This EmulateRecognizeAsync call does not match the grammar 
        // or generate a SpeechRecognized event.
        recognizer.EmulateRecognizeAsync("testing one two three");

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

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

    // Handle the SpeechRecognized event.
    static void SpeechRecognizedHandler(
      object sender, SpeechRecognizedEventArgs e)
    {
      if (e.Result != null)
      {
        Console.WriteLine("Recognition result = {0}",
          e.Result.Text ?? "<no text>");
      }
      else
      {
        Console.WriteLine("No recognition result");
      }
    }

    // Handle the EmulateRecognizeCompleted event. 
    static void EmulateRecognizeCompletedHandler(
      object sender, EmulateRecognizeCompletedEventArgs e)
    {
      if (e.Result == null)
      {
        Console.WriteLine("No result generated.");
      }

      completed = true;
    }
  }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4
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