Sapi 添加语法的文章（转载）

最近在做SAPI方面的工作，比较详细的中文资料不多，遇到各种问题，本来想着做完了项目总结一下，今天看到这篇文章，对于SAPI加载识别语法方面的描述十分详细，先转过来做个备份，谢谢原文博主：djyangmaowei，原文地址：http://blog.csdn.net/djyangmaowei/article/details/5384942

应用程序可以利用SpSharedRecoContext接口创建不同的与语音识别引擎的连接。每一个连接都可以使用各自的事件并且使用不同的语音识别语法（grammars）。每一个基于SAPI语音识别的应用程序必须具有至少一个SpSharedRecoContext接口。

第一种方法： 自己定义Grammar

using System;

using System.Collections;

using System.ComponentModel;

using System.Drawing;

using System.Data;

using System.Windows.Forms;

using System.Diagnostics;

using SpeechLib;

namespace WindowsFormsApplication3

{

public partial class Form1 : Form

{

private SpeechLib.ISpeechGrammarRule menuRule = null;

private SpeechLib.SpSharedRecoContext objRecoContext;

private ISpeechRecoGrammar grammar;

public Form1()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

// 得到一个RecoContext实例.

objRecoContext = new SpeechLib.SpSharedRecoContext();

// 指派一个事件给Hypothesis Event(中间层暂定的识别，即，初级的，临时的识别).

objRecoContext.Hypothesis += new _ISpeechRecoContextEvents_HypothesisEventHandler(Hypo_Event);

// 指派一个事件给语音识别.

objRecoContext.Recognition += new _ISpeechRecoContextEvents_RecognitionEventHandler(Reco_Event);

//创建grammer实例.

grammar = objRecoContext.CreateGrammar(0);

label1.Text = "Speak Out one of the following./r/n1. 人民 2. 马克思 3. 孙中山 4. 恩格斯/r/n5. 杨茂巍 6. 王芳 7. 世界 8. 成都";

//激活菜单命令.

menuRule = grammar.Rules.Add("MenuCommands", SpeechRuleAttributes.SRATopLevel | SpeechRuleAttributes.SRADynamic, 1);

object PropValue = "";

menuRule.InitialState.AddWordTransition(null, "人民", " ", SpeechGrammarWordType.SGLexical, "人民", 1, ref PropValue, 1.0F);

menuRule.InitialState.AddWordTransition(null, "马克思", " ", SpeechGrammarWordType.SGLexical, "马克思", 2, ref PropValue, 1.0F);

menuRule.InitialState.AddWordTransition(null, "孙中山", " ", SpeechGrammarWordType.SGLexical, "孙中山", 3, ref PropValue, 1.0F);

menuRule.InitialState.AddWordTransition(null, "恩格斯", " ", SpeechGrammarWordType.SGLexical, "恩格斯", 4, ref PropValue, 1.0F);

menuRule.InitialState.AddWordTransition(null, "杨茂巍", " ", SpeechGrammarWordType.SGLexical, "杨茂巍", 5, ref PropValue, 1.0F);

menuRule.InitialState.AddWordTransition(null, "王芳 ", " ", SpeechGrammarWordType.SGLexical, "王芳 ", 6, ref PropValue, 1.0F);

menuRule.InitialState.AddWordTransition(null, "世界", " ", SpeechGrammarWordType.SGLexical, "世界", 7, ref PropValue, 1.0F);

menuRule.InitialState.AddWordTransition(null, "成都", " ", SpeechGrammarWordType.SGLexical, "成都", 8, ref PropValue, 1.0F);

grammar.Rules.Commit();

grammar.CmdSetRuleState("MenuCommands", SpeechRuleState.SGDSActive);

}

private void Reco_Event(int StreamNumber, object StreamPosition, SpeechRecognitionType RecognitionType, ISpeechRecoResult Result)

{

textBox1.Text = Result.PhraseInfo.GetText(0, -1, true);

}

private void Hypo_Event(int StreamNumber, object StreamPosition, ISpeechRecoResult Result)

{

textBox2.Text = Result.PhraseInfo.GetText(0, -1, true);

}

}

}

第二种方法：

不定义Grammar 利用SAPI自动识别输入语音 准确率不高

public class SpRecognition

     {

          private static SpRecognition _Instance = null ;

          private SpeechLib.ISpeechRecoGrammar isrg ;

          private SpeechLib.SpSharedRecoContextClass ssrContex =null;

          private System.Windows.Forms.Control cDisplay  ;

          private SpRecognition()

         {

              ssrContex = new SpSharedRecoContextClass() ;

              isrg = ssrContex.CreateGrammar(1) ;          

              SpeechLib._ISpeechRecoContextEvents_RecognitionEventHandler recHandle =

                   new _ISpeechRecoContextEvents_RecognitionEventHandler(ContexRecognition) ;

              ssrContex.Recognition += recHandle ;

         }

         public void BeginRec(Control tbResult)

         {            

              isrg.DictationSetState(SpeechRuleState.SGDSActive) ;

              cDisplay = tbResult ;

         }

         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)

         {

              cDisplay.Text += result.PhraseInfo.GetText(0,-1,true) ;

         }

 

     }

第三种方法：

外界读入xml grammar （c://1.xml）

 private SpeechLib.SpSharedRecoContext ssrc;

        private ISpeechRecoGrammar srg;

        private void button1_Click(object sender, EventArgs e)

        {

            ssrc = new SpSharedRecoContext();

            srg = ssrc.CreateGrammar(1);

            srg.CmdLoadFromFile("c://1.xml", SpeechLoadOption.SLODynamic);//读入规则

           // ssrc.EventInterests = SpeechRecoEvents.SREAllEvents;//在"语音事件"中有说明

            ssrc.Recognition += new _ISpeechRecoContextEvents_RecognitionEventHandler(ssrc_Recognition);//添加识别事件     

            ssrc.Hypothesis += new _ISpeechRecoContextEvents_HypothesisEventHandler(Hypo_Event);

            srg.CmdSetRuleState(srg.Rules.Item(0).Name, SpeechRuleState.SGDSActive);//激活规则       

        }

        private void button2_Click(object sender, EventArgs e)

        {

          

        }

        private void button3_Click(object sender, EventArgs e)

        {

           

        }

        void ssrc_Recognition(int StreamNumber, object StreamPosition, SpeechRecognitionType RecognitionType, ISpeechRecoResult Result)

        {

            textBox1.Text = Result.PhraseInfo.GetText(0, -1, true);

        }

        private void Hypo_Event(int StreamNumber, object StreamPosition, ISpeechRecoResult Result)

        {

            textBox2.Text = Result.PhraseInfo.GetText(0, -1, true);

        }

 

1.xml

<?xml version="1.0" encoding="gb2312" ?> 

<GRAMMAR LANGID="804"> 

<RULE NAME="命令" TOPLEVEL="ACTIVE"> 

<L> 

<P>口令结束</P> 

<P>放大</P> 

<P>Home</P> 

<p>End</p> 

<P>上一页</P> 

<P>下一页</P> 

<P>向上</P> 

<P>向下</P> 

<P>左窗口</P> 

<P>右窗口</P> 

<P>关闭</P> 

<P>撤消</P> 

<P>刷新</P> 

</L> 

</RULE> 

</GRAMMAR>

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