SpeechRecognitionEngine.RecognizeAsync 方法

定义

命名空间:

System.Speech.Recognition

程序集:

System.Speech.dll

包:

System.Speech v9.0.0

启动异步语音识别操作。

重载

RecognizeAsync()	执行单个异步语音识别操作。
RecognizeAsync(RecognizeMode)	执行一个或多个异步语音识别操作。

注解

这些方法执行单个或多个异步识别操作。 识别器对其加载和启用的语音识别语法执行每个操作。

在调用此方法期间，识别器可能会引发以下事件：

• SpeechDetected. 当识别器检测到它可以标识为语音的输入时引发。

• SpeechHypothesized. 当输入使用活动语法之一创建不明确的匹配时引发。

• SpeechRecognitionRejected 或 SpeechRecognized。 当识别器完成识别操作时引发。

• RecognizeCompleted. 在操作完成时 RecognizeAsync 引发。

若要检索异步识别操作的结果，请将事件处理程序附加到识别器的事件 SpeechRecognized 。 每当识别器成功完成同步或异步识别操作时，它就引发此事件。 如果识别不成功，Result则可以在 事件的处理程序RecognizeCompleted中访问 的 对象上的 RecognizeCompletedEventArgs 属性为 null。

异步识别操作可能由于以下原因而失败：

• 在 或 InitialSilenceTimeout 属性的超时间隔到期BabbleTimeout之前，不会检测到语音。

• 识别引擎检测语音，但在其任何已加载和启用 Grammar 的对象中都找不到匹配项。

• 在执行识别之前， SpeechRecognitionEngine 必须至少加载一个 Grammar 对象。 若要加载语音识别语法，请使用 LoadGrammar 或 LoadGrammarAsync 方法。

• 若要修改识别器处理与识别相关的语音或静音计时的方式，请使用 BabbleTimeout、 InitialSilenceTimeout、 EndSilenceTimeout和 EndSilenceTimeoutAmbiguous 属性。

• 若要执行同步识别，请使用 方法之 Recognize 一。

RecognizeAsync()

Source:

SpeechRecognitionEngine.cs

执行单个异步语音识别操作。

public:
 void RecognizeAsync();

public void RecognizeAsync ();

member this.RecognizeAsync : unit -> unit

Public Sub RecognizeAsync ()

示例

以下示例演示演示基本异步语音识别的控制台应用程序的一部分。 该示例创建 ， DictationGrammar将其加载到进程内语音识别器中，并执行一个异步识别操作。 包含事件处理程序，用于演示识别器在操作期间引发的事件。

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 a grammar for choosing cities for a flight.  
        Choices cities = new Choices(new string[]   
        { "Los Angeles", "New York", "Chicago", "San Francisco", "Miami", "Dallas" });  

        GrammarBuilder gb = new GrammarBuilder();  
        gb.Append("I want to fly from");  
        gb.Append(cities);  
        gb.Append("to");  
        gb.Append(cities);  

        // Construct a Grammar object and load it to the recognizer.  
        Grammar cityChooser = new Grammar(gb);  
        cityChooser.Name = ("City Chooser");  
        recognizer.LoadGrammarAsync(cityChooser);  

        // 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);  

        // Assign input to the recognizer and start an asynchronous  
        // recognition operation.  
        recognizer.SetInputToDefaultAudioDevice();  

        completed = false;  
        Console.WriteLine("Starting asynchronous recognition...");  
        recognizer.RecognizeAsync();  

        // 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.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);  
        Console.WriteLine(" - AudioPosition = {0}", e.AudioPosition);  
      }  
      else  
      {  
        Console.WriteLine(" - No result.");  
      }  

      completed = true;  
    }  
  }  
}

注解

此方法执行单个异步识别操作。 识别器对其加载的和启用的语音识别语法执行操作。

在调用此方法期间，识别器可能会引发以下事件：

• SpeechDetected. 当识别器检测到它可以标识为语音的输入时引发。

• SpeechHypothesized. 当输入使用活动语法之一创建不明确的匹配时引发。

• SpeechRecognitionRejected 或 SpeechRecognized。 当识别器完成识别操作时引发。

• RecognizeCompleted. 在操作完成时 RecognizeAsync 引发。

若要检索异步识别操作的结果，请将事件处理程序附加到识别器的事件 SpeechRecognized 。 每当识别器成功完成同步或异步识别操作时，它就引发此事件。 如果识别不成功，Result则可以在 事件的处理程序RecognizeCompleted中访问 的 对象上的 RecognizeCompletedEventArgs 属性为 null。

若要执行同步识别，请使用 方法之 Recognize 一。

此方法将存储在任务中，它返回该方法的同步对应项可能引发的所有非使用异常。 如果异常存储在返回的任务中，则在等待任务时将引发该异常。 使用异常（如 ArgumentException）仍会同步引发。 有关存储的异常，请参阅 引发的 Recognize()异常。

另请参阅

• BabbleTimeout
• InitialSilenceTimeout
• EndSilenceTimeout
• EndSilenceTimeoutAmbiguous
• SpeechDetected
• SpeechHypothesized
• SpeechRecognitionRejected
• SpeechRecognized
• RecognizeCompleted
• Recognize()
• EmulateRecognizeAsync(String)

RecognizeAsync(RecognizeMode)

Source:

SpeechRecognitionEngine.cs

执行一个或多个异步语音识别操作。

public:
 void RecognizeAsync(System::Speech::Recognition::RecognizeMode mode);

public void RecognizeAsync (System.Speech.Recognition.RecognizeMode mode);

member this.RecognizeAsync : System.Speech.Recognition.RecognizeMode -> unit

Public Sub RecognizeAsync (mode As RecognizeMode)

参数

mode

RecognizeMode

指示是否执行一个或多个识别操作。

示例

以下示例演示演示基本异步语音识别的控制台应用程序的一部分。 该示例创建 ， DictationGrammar将其加载到进程内语音识别器中，并执行多个异步识别操作。 异步操作将在 30 秒后取消。 包含事件处理程序，用于演示识别器在操作期间引发的事件。

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 a grammar for choosing cities for a flight.  
        Choices cities = new Choices(new string[] { "Los Angeles", "New York", "Chicago", "San Francisco", "Miami", "Dallas" });  

        GrammarBuilder gb = new GrammarBuilder();  
        gb.Append("I want to fly from");  
        gb.Append(cities);  
        gb.Append("to");  
        gb.Append(cities);  

        // Construct a Grammar object and load it to the recognizer.  
        Grammar cityChooser = new Grammar(gb);  
        cityChooser.Name = ("City Chooser");  
        recognizer.LoadGrammarAsync(cityChooser);  

        // 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);  

        // Assign input to the recognizer and start asynchronous  
        // recognition.  
        recognizer.SetInputToDefaultAudioDevice();  

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

        // Wait 30 seconds, and then cancel asynchronous recognition.  
        Thread.Sleep(TimeSpan.FromSeconds(30));  
        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.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);  
        Console.WriteLine(" - AudioPosition = {0}", e.AudioPosition);  
      }  
      else  
      {  
        Console.WriteLine(" - No result.");  
      }  

      completed = true;  
    }  
  }  
}  

注解

如果 mode 为 Multiple，则识别器将继续执行异步识别操作， RecognizeAsyncCancel 直到调用 或 RecognizeAsyncStop 方法。

在调用此方法期间，识别器可能会引发以下事件：

• SpeechDetected. 当识别器检测到它可以标识为语音的输入时引发。

• SpeechHypothesized. 当输入使用活动语法之一创建不明确的匹配时引发。

• SpeechRecognitionRejected 或 SpeechRecognized。 当识别器完成识别操作时引发。

• RecognizeCompleted. 在操作完成时 RecognizeAsync 引发。

若要检索异步识别操作的结果，请将事件处理程序附加到识别器的事件 SpeechRecognized 。 每当识别器成功完成同步或异步识别操作时，它就引发此事件。 如果识别不成功，Result则可以在 事件的处理程序RecognizeCompleted中访问 的 对象上的 RecognizeCompletedEventArgs 属性为 null。

异步识别操作可能由于以下原因而失败：

• 在 或 InitialSilenceTimeout 属性的超时间隔到期BabbleTimeout之前，不会检测到语音。

• 识别引擎检测语音，但在其任何已加载和启用 Grammar 的对象中都找不到匹配项。

若要执行同步识别，请使用 方法之 Recognize 一。

另请参阅

• BabbleTimeout
• InitialSilenceTimeout
• EndSilenceTimeout
• EndSilenceTimeoutAmbiguous
• SpeechDetected
• SpeechHypothesized
• SpeechRecognitionRejected
• SpeechRecognized
• RecognizeCompleted
• Recognize()
• EmulateRecognizeAsync(String)