Speech SDK 5.1--No.4：用xml描述语法规则初探

        最悲哀的莫过于，我不知道microsoft speech sdk 5.1的原理，却要依葫芦画瓢做一个系统，没时间先去弄懂microsoft speech sdk 5.1了。本文需要读者有一定的microsoft speech sdk 5.1基础。我也不知道xml规则，但是看了下面的函数和xml文档，我大致知道怎么回事。希望能给其他人一些帮助。
        两个重要的函数：
void speechControl::RecoEvent()
{
USES_CONVERSION;
CSpEvent event;

// Process all of the recognition events
while (event.GetFrom(m_cpRecoCtxt) == S_OK)
{
switch (event.eEventId)
{
case SPEI_RECOGNITION:
// There may be multiple recognition results, so get all of them
{
CSpDynamicString dstrText;
if (SUCCEEDED(event.RecoResult()->GetText(SP_GETWHOLEPHRASE, SP_GETWHOLEPHRASE,
TRUE, &dstrText, NULL)))
{
// MessageBox(m_hWnd,(char*)dstrText.Copy(),"recognized",0);

m_cpVoice->Speak( dstrText, SPF_ASYNC, NULL);
}
ExecuteCommand(event.RecoResult());
}
break;
}
}
}
void speechControl::ExecuteCommand(ISpPhrase *pPhrase)
{
HWND hWnd=m_hWnd;

SPPHRASE *pElements;

// Get the phrase elements, one of which is the rule id we specified in
// the grammar. Switch on it to figure out which command was recognized.
if (SUCCEEDED(pPhrase->GetPhrase(&pElements)))
{
switch ( pElements->Rule.ulId )
{
case VID_Hello:
case VID_Stops:
case VID_Out:
case VID_Navigation:
{
switch( pElements->pProperties->vValue.ulVal )
{
case VID_Feifei:
m_cpCmdGrammar->SetRuleIdState(VID_Navigation,SPRS_ACTIVE);
m_cpCmdGrammar->SetRuleIdState(VID_Stops,SPRS_ACTIVE);
m_cpCmdGrammar->SetRuleIdState(VID_Out,SPRS_ACTIVE);
MessageBox(hWnd,"OK,madam,you can control me!",NULL,0);
// m_cpVoice->Speak(L"OK,madam,you can control me!", SPF_ASYNC, NULL);
break;
case VID_Out:
m_cpCmdGrammar->SetRuleIdState(VID_Navigation,SPRS_INACTIVE);
m_cpCmdGrammar->SetRuleIdState(VID_Stops,SPRS_INACTIVE);
m_cpCmdGrammar->SetRuleIdState(VID_Out,SPRS_INACTIVE);
break;
case VID_Ahead:
// PostMessage( hWnd, WM_GOTOCOUNTER, NULL, NULL );
MessageBox(hWnd,"turn/go ahead","ahead",0);
break;
case VID_Left:
MessageBox(hWnd,"turn/go left","left",0);
break;
case VID_Back:
MessageBox(hWnd,"turn/go back","back",0);
break;
case VID_Right:
MessageBox(hWnd,"turn/go right","right",0);
break;
case VID_Stop:
MessageBox(hWnd,"turn/go stop","stop",0);
break;
}
break;
}
case VID_Place:
{
switch( pElements->pProperties->vValue.ulVal )
{
case VID_Ahead:
// PostMessage( hWnd, WM_GOTOCOUNTER, NULL, NULL );
MessageBox(hWnd,"ahead","ahead",0);
break;
case VID_Left:
MessageBox(hWnd,"left","left",0);
break;
case VID_Back:
MessageBox(hWnd,"back","back",0);
break;
case VID_Right:
MessageBox(hWnd,"right","right",0);
break;

case VID_Stop:
MessageBox(hWnd,"stop","stop",0);
break;
}
}
break;
}
// Free the pElements memory which was allocated for us
::CoTaskMemFree(pElements);
}
}

对应的xml文件:

<?xml version="1.0" encoding="GB2312"?>
<GRAMMAR LANGID="804">
<DEFINE>
<ID NAME="VID_Hello" VAL="100"/>
<ID NAME="VID_Ahead" VAL="1"/>
<ID NAME="VID_Back" VAL="2"/>
<ID NAME="VID_Left" VAL="3"/>
<ID NAME="VID_Right" VAL="4"/>
<ID NAME="VID_Stop" VAL="5"/>
<ID NAME="VID_Stops" VAL="6"/>
<ID NAME="VID_Tiantian" VAL="101"/>
<ID NAME="VID_Haha" VAL="102"/>
<ID NAME="VID_Feifei" VAL="103"/>
<ID NAME="VID_Out" VAL="200"/>
<ID NAME="VID_Place" VAL="253"/>
<ID NAME="VID_Navigation" VAL="254"/>
</DEFINE>
<RULE ID="VID_Hello" TOPLEVEL="ACTIVE">
<O>你好</O>
<P>
<L PROPID="VID_Hello" >
<P  VAL="VID_Tiantian">天天</P>
<P  VAL="VID_Haha">哈哈</P>
<P  VAL="VID_Feifei">飞飞</P>
</L>
</P>
</RULE>
<RULE ID="VID_Out" TOPLEVEL="INACTIVE">
<P>
<L PROPID="VID_Out" >
<P  VAL="VID_Out">好了</P>
<P  VAL="VID_Out">拜拜</P>
<P  VAL="VID_Out">再见</P>
<P  VAL="VID_Out">结束</P>
</L>
</P>
</RULE>
<RULE ID="VID_Navigation" TOPLEVEL="INACTIVE">
<O>请</O>
<P>
<L>
<P>朝</P>
<P>向</P>
</L>
</P>
<L>
<RULEREF REFID="VID_Place" />
<RULEREF REFID="VID_Stops" />
</L>
</RULE>
<RULE ID="VID_Place"  >
<L PROPID="VID_Place" >
<P>
<P PROPID="VID_Place" VAL="VID_Ahead">前</P>
<O>
<L>
<P>走</P>
<p>进</P>
<p>跑</P>
</L>
</O>
</P>
<P VAL="VID_Back">后退</P>
<P>
<P PROPID="VID_Place" VAL="VID_Left">左</P>
<O>
<L>
<P>转</P>
<p>拐</P>
<p>跑</P>
</L>
</O>
</P>
<P>
<P PROPID="VID_Place" VAL="VID_Right">右</P>
<O>
<L>
<P>转</P>
<p>拐</P>
<p>跑</P>
</L>
</O>
</P>
<P VAL="VID_Stop">
<L>
<P>停下来</P>
<p>停止</P>
</L>
</P>
</L>
</RULE>
<RULE ID="VID_Stops" TOPLEVEL="INACTIVE">
<P PROPID="VID_Stops" VAL="VID_Stop">停</P>
<L>
<P>下来</P>
<p>止前进</P>
<p>吧</P>
</L>
</RULE>
</GRAMMAR>