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windowsapi，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MicrosoftSpeech object library引用
publicclassSpRecognition
{
privatestaticSpRecognition_Instance=null;
privateSpeechLib.ISpeechRecoGrammarisrg;
privateSpeechLib.SpSharedRecoContextClassssrContex=null;
publicdelegatevoidStringEvent(stringstr);
publicStringEventSetMessage;
privateSpRecognition()
{
ssrContex=newSpSharedRecoContextClass();
isrg=ssrContex.CreateGrammar(1);
SpeechLib._ISpeechRecoContextEvents_RecognitionEventHandlerrecHandle=
new_ISpeechRecoContextEvents_RecognitionEventHandler(ContexRecognition);
ssrContex.Recognition+=recHandle;
}
publicvoidBeginRec()
{
isrg.DictationSetState(SpeechRuleState.SGDSActive);
}
publicstaticSpRecognitioninstance()
{
if(_Instance==null)
_Instance=newSpRecognition();
return_Instance;
}
publicvoidCloseRec()
{
isrg.DictationSetState(SpeechRuleState.SGDSInactive);
}
privatevoidContexRecognition(intiIndex,objectobj,SpeechLib.SpeechRecognitionTypetype,SpeechLib.ISpeechRecoResultresult)
{
if(SetMessage!=null)
{
SetMessage(result.PhraseInfo.GetText(0,-1,true));
}
}
}
第二种同样需要引入，不过引入的是Win7中的.NET3.5类库
usingSystem;
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Text;
usingSystem.Speech;
usingSystem.Speech.Recognition;
usingSystem.Globalization;
usingSystem.Windows.Forms;
namespaceStudyBeta
{
publicclassSRecognition
{
publicSpeechRecognitionEnginerecognizer=null;//语音识别引擎
publicDictationGrammardictationGrammar=null;//自然语法
publicSystem.Windows.Forms.ControlcDisplay;//显示控件
publicSRecognition(string[]fg)//创建关键词语列表
{
CultureInfomyCIintl=newCultureInfo("en-US");
foreach(RecognizerInfoconfiginSpeechRecognitionEngine.InstalledRecognizers())//获取所有语音引擎
{
if(config.Culture.Equals(myCIintl)&&config.Id=="MS-1033-80-DESK")
{
recognizer=newSpeechRecognitionEngine(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=newDictationGrammar();
}
else
{
MessageBox.Show("创建语音识别失败");
}
}
privatevoidInitializeSpeechRecognitionEngine(string[]fg)
{
recognizer.SetInputToDefaultAudioDevice();//选择默认的音频输入设备
GrammarcustomGrammar=CreateCustomGrammar(fg);
//根据关键字数组建立语法
recognizer.UnloadAllGrammars();
recognizer.LoadGrammar(customGrammar);
//加载语法
recognizer.SpeechRecognized+=newEventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);
recognizer.SpeechHypothesized+=newEventHandler<SpeechHypothesizedEventArgs>(recognizer_SpeechHypothesized);
}
publicvoidBeginRec(ControltbResult)//关联窗口控件
{
TurnSpeechRecognitionOn();
TurnDictationOn();
cDisplay=tbResult;
}
publicvoidover()//停止语音识别引擎
{
TurnSpeechRecognitionOff();
}
publicvirtualGrammarCreateCustomGrammar(string[]fg)//创造自定义语法
{
GrammarBuildergrammarBuilder=newGrammarBuilder();
grammarBuilder.Append(newChoices(fg));
returnnewGrammar(grammarBuilder);
}
privatevoidTurnSpeechRecognitionOn()//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");
}
}
privatevoidTurnSpeechRecognitionOff()//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");
}
}
privatevoidrecognizer_SpeechRecognized(objectsender,SpeechRecognizedEventArgse)
{
//识别出结果完成的动作，通常把识别结果传给某一个控件
stringtext=e.Result.Text;
cDisplay.Text=text;
}
privatevoidTurnDictationOn()
{
if(recognizer!=null)
{
recognizer.LoadGrammar(dictationGrammar);
//加载自然语法
}
else
{
MessageBox.Show("创建语音识别失败");
}
}
privatevoidTurnDictationOff()
{
if(dictationGrammar!=null)
{
recognizer.UnloadGrammar(dictationGrammar);
//卸载自然语法
}
else
{
MessageBox.Show("创建语音识别失败");
}
}
}
}