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C#中調(diào)用SAPI實(shí)現(xiàn)語(yǔ)音識(shí)別的2種方法

更新時(shí)間：2015年06月04日 17:42:59 投稿：junjie

這篇文章主要介紹了C#中調(diào)用SAPI實(shí)現(xiàn)語(yǔ)音識(shí)別的2種方法,本文直接給出實(shí)現(xiàn)代碼,需要的朋友可以參考下

通過(guò)微軟的SAPI，不僅僅可以實(shí)現(xiàn)語(yǔ)音合成TTS，同樣可以實(shí)現(xiàn)語(yǔ)音識(shí)別SR。下面我們就介紹并貼出相關(guān)代碼。主要有兩種方式：

1、使用COM組件技術(shù)，不管是C++，C#，Delphi都能玩的轉(zhuǎn)，開(kāi)發(fā)出來(lái)的東西在XP和WIN7都能跑。（注意要引入系統(tǒng)組件SpeechLib，XP要安裝識(shí)別引擎）
2、使用WIN7的windows api，其實(shí)最終還是調(diào)用了SAPI，所以開(kāi)發(fā)出來(lái)的東西就只能在WIN7上面跑。

其實(shí)不管是哪一種，都是調(diào)用SAPI，可能后一種代碼比較簡(jiǎn)單。

使用第一種方式，需要注意在COM選項(xiàng)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(1);
      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(0, -1, true));
      }
    }
  }

第二種同樣需要引入，不過(guò)引入的是Win7中的.NET3.5類庫(kù)

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;//語(yǔ)音識(shí)別引擎
    public DictationGrammar dictationGrammar = null; //自然語(yǔ)法
    public System.Windows.Forms.Control cDisplay; //顯示控件

    public SRecognition(string[] fg) //創(chuàng)建關(guān)鍵詞語(yǔ)列表
    {
      CultureInfo myCIintl = new CultureInfo("en-US");
      foreach (RecognizerInfo config in SpeechRecognitionEngine. InstalledRecognizers())//獲取所有語(yǔ)音引擎
      {
    if (config.Culture.Equals(myCIintl) && config.Id == "MS-1033-80-DESK" )
        {
          recognizer = new SpeechRecognitionEngine(config);
          break;
        }//選擇美國(guó)英語(yǔ)的識(shí)別引擎
      }
      if (recognizer != null)
      {
        InitializeSpeechRecognitionEngine(fg);//初始化語(yǔ)音識(shí)別引擎
        dictationGrammar = new DictationGrammar();
      }
      else
      {
        MessageBox.Show("創(chuàng)建語(yǔ)音識(shí)別失敗");
      }
    }
    private void InitializeSpeechRecognitionEngine(string[] fg)
    {
      recognizer.SetInputToDefaultAudioDevice();//選擇默認(rèn)的音頻輸入設(shè)備
      Grammar customGrammar = CreateCustomGrammar(fg);
  //根據(jù)關(guān)鍵字?jǐn)?shù)組建立語(yǔ)法
      recognizer.UnloadAllGrammars();
      recognizer.LoadGrammar(customGrammar);
  //加載語(yǔ)法
recognizer.SpeechRecognized += new EventHandler <SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);
recognizer.SpeechHypothesized += new EventHandler <SpeechHypothesizedEventArgs>(recognizer_SpeechHypothesized);
    }
    public void BeginRec(Control tbResult)//關(guān)聯(lián)窗口控件
    {
      TurnSpeechRecognitionOn();
      TurnDictationOn();
      cDisplay = tbResult;
    }
    public void over()//停止語(yǔ)音識(shí)別引擎
    {
      TurnSpeechRecognitionOff();
    }
    public virtual Grammar CreateCustomGrammar(string[] fg) //創(chuàng)造自定義語(yǔ)法
    {
      GrammarBuilder grammarBuilder = new GrammarBuilder();
      grammarBuilder.Append(new Choices(fg));
      return new Grammar(grammarBuilder);
    }
    private void TurnSpeechRecognitionOn()//啟動(dòng)語(yǔ)音識(shí)別函數(shù)
    {
      if (recognizer != null)
      {
        recognizer.RecognizeAsync(RecognizeMode.Multiple); 
//識(shí)別模式為連續(xù)識(shí)別
      }
      else
      {
        MessageBox.Show("創(chuàng)建語(yǔ)音識(shí)別失敗");
      }
    }
    private void TurnSpeechRecognitionOff()//關(guān)閉語(yǔ)音識(shí)別函數(shù)
    {
      if (recognizer != null)
      {
        recognizer.RecognizeAsyncStop();
        TurnDictationOff();
      }
      else
      {
        MessageBox.Show("創(chuàng)建語(yǔ)音識(shí)別失敗");
      }
    }
private void recognizer_SpeechRecognized(object sender, SpeechRecognized EventArgs e)
    {
  //識(shí)別出結(jié)果完成的動(dòng)作，通常把識(shí)別結(jié)果傳給某一個(gè)控件
      string text = e.Result.Text;
      cDisplay.Text = text;
    }
    private void TurnDictationOn()
    {
      if (recognizer != null)
      {
        recognizer.LoadGrammar(dictationGrammar);
  //加載自然語(yǔ)法
      }
      else
      {
        MessageBox.Show("創(chuàng)建語(yǔ)音識(shí)別失敗");
      }
    }
    private void TurnDictationOff()
    {
      if (dictationGrammar != null)
      {
        recognizer.UnloadGrammar(dictationGrammar);
  //卸載自然語(yǔ)法
      }
      else
      {
        MessageBox.Show("創(chuàng)建語(yǔ)音識(shí)別失敗");
      }
    }
  }
}

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