C#中调用SAPI实现语音识别的2种方法

通过微软的SAPI，不仅仅可以实现语音合成TTS，同样可以实现语音识别SR。下面我们就介绍并贴出相关代码。主要有两种方式：

1、使用COM组件技术，不管是C++，C#，Delphi都能玩的转，开发出来的东西在XP和WIN7都能跑。（注意要引入系统组件SpeechLib，XP要安装识别引擎）
2、使用WIN7的windows api，其实最终还是调用了SAPI，所以开发出来的东西就只能在WIN7上面跑。

其实不管是哪一种，都是调用SAPI，可能后一种代码比较简单。

使用第一种方式，需要注意在COM选项卡里面的Microsoft Speech object library引用

public class SpRecognition

  {

    private static SpRecognition _Instance = null;

    private SpeechLib.ISpeechRecoGrammar isrg;

    private SpeechLib.SpSharedRecoContextClass ssrContex = null;

    public delegate void StringEvent(string str);

    public StringEvent SetMessage;

    private SpRecognition()

    {

      ssrContex = new SpSharedRecoContextClass();

      isrg = ssrContex.CreateGrammar();

      SpeechLib._ISpeechRecoContextEvents_RecognitionEventHandler recHandle =

         new _ISpeechRecoContextEvents_RecognitionEventHandler(ContexRecognition);

      ssrContex.Recognition += recHandle;

    }

    public void BeginRec()

    {

      isrg.DictationSetState(SpeechRuleState.SGDSActive);

    }

    public static SpRecognition instance()

    {

      if (_Instance == null)

        _Instance = new SpRecognition();

      return _Instance;

    }

    public void CloseRec()

    {

      isrg.DictationSetState(SpeechRuleState.SGDSInactive);

    }

    private void ContexRecognition(int iIndex, object obj, SpeechLib.SpeechRecognitionType type, SpeechLib.ISpeechRecoResult result)

    {

      if (SetMessage != null)

      {

        SetMessage(result.PhraseInfo.GetText(, -, true));

      }

    }

  }

第二种同样需要引入，不过引入的是Win7中的.NET3.5类库

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Speech;

using System.Speech.Recognition;

using System.Globalization;

using System.Windows.Forms;

namespace StudyBeta

{

  public class SRecognition

  {

    public SpeechRecognitionEngine recognizer = null;//语音识别引擎

    public DictationGrammar dictationGrammar = null; //自然语法

    public System.Windows.Forms.Control cDisplay; //显示控件

    public SRecognition(string[] fg) //创建关键词语列表

    {

      CultureInfo myCIintl = new CultureInfo("en-US");

      foreach (RecognizerInfo config in SpeechRecognitionEngine. InstalledRecognizers())//获取所有语音引擎

      {

    if (config.Culture.Equals(myCIintl) && config.Id == "MS-1033-80-DESK" )

        {

          recognizer = new SpeechRecognitionEngine(config);

          break;

        }//选择美国英语的识别引擎

      }

      if (recognizer != null)

      {

        InitializeSpeechRecognitionEngine(fg);//初始化语音识别引擎

        dictationGrammar = new DictationGrammar();

      }

      else

      {

        MessageBox.Show("创建语音识别失败");

      }

    }

    private void InitializeSpeechRecognitionEngine(string[] fg)

    {

      　　recognizer.SetInputToDefaultAudioDevice();//选择默认的音频输入设备

      　　Grammar customGrammar = CreateCustomGrammar(fg);

  　　　　//根据关键字数组建立语法

      　　recognizer.UnloadAllGrammars();

      　　recognizer.LoadGrammar(customGrammar);

  　　　　//加载语法

　　　　　recognizer.SpeechRecognized += new EventHandler <SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);

　　　　　recognizer.SpeechHypothesized += new EventHandler <SpeechHypothesizedEventArgs>(recognizer_SpeechHypothesized);

    }

    public void BeginRec(Control tbResult)//关联窗口控件

    {

      TurnSpeechRecognitionOn();

      TurnDictationOn();

      cDisplay = tbResult;

    }

    public void over()//停止语音识别引擎

    {

      TurnSpeechRecognitionOff();

    }

    public virtual Grammar CreateCustomGrammar(string[] fg) //创造自定义语法

    {

      GrammarBuilder grammarBuilder = new GrammarBuilder();

      grammarBuilder.Append(new Choices(fg));

      return new Grammar(grammarBuilder);

    }

    private void TurnSpeechRecognitionOn()//启动语音识别函数

    {

      if (recognizer != null)

      {

        recognizer.RecognizeAsync(RecognizeMode.Multiple); //识别模式为连续识别

      }

      else

      {

        MessageBox.Show("创建语音识别失败");

      }

    }

    private void TurnSpeechRecognitionOff()//关闭语音识别函数

    {

      if (recognizer != null)

      {

        recognizer.RecognizeAsyncStop();

        TurnDictationOff();

      }

      else

      {

        MessageBox.Show("创建语音识别失败");

      }

    }

private void recognizer_SpeechRecognized(object sender, SpeechRecognized EventArgs e)

    {

  //识别出结果完成的动作，通常把识别结果传给某一个控件

      string text = e.Result.Text;

      cDisplay.Text = text;

    }

    private void TurnDictationOn()

    {

      if (recognizer != null)

      {

        recognizer.LoadGrammar(dictationGrammar);

  //加载自然语法

      }

      else

      {

        MessageBox.Show("创建语音识别失败");

      }

    }

    private void TurnDictationOff()

    {

      if (dictationGrammar != null)

      {

        recognizer.UnloadGrammar(dictationGrammar);

  //卸载自然语法

      }

      else

      {

        MessageBox.Show("创建语音识别失败");

      }

    }

  }

}

*********转载：https://m.jb51.net/article/67278.htm

巴特西

C#中调用SAPI实现语音识别的2种方法

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