微软的语音识别,在这里我们简称它为SR(speech recognition),SR分为两种模式的监听：第一种模式：任意监听，即随意输入语音，监听对象将最为接近的字或者词，句反馈出来；第二种模式：划定范围监听，制定一组被选项做为监听的，用户的语音输入被反馈成最为接近的一个选项。说得通俗一些：第一种是填空题，第二种是选择题目。
今天我们就一起来学习如何用C++ 来完成一道语音识别的填空题：
代码如下:
#include
#include
#include
#include
#include
#include "sphelper.h"
//Copyright (c) Microsoft Corporation. All rights reserved.
inline HRESULT BlockForResult(ISpRecoContext * pRecoCtxt, ISpRecoResult ** ppResult){
HRESULT hr = S_OK;
CSpEvent event;
while (SUCCEEDED(hr) &&
SUCCEEDED(hr = event.GetFrom(pRecoCtxt)) &&
hr == S_FALSE)
{
hr = pRecoCtxt->WaitForNotifyEvent(INFINITE);
}
*ppResult = event.RecoResult();
if (*ppResult)
{
(*ppResult)->AddRef();
}
return hr;
}
const WCHAR * StopWord()
{
const WCHAR * pchStop;
LANGID LangId = ::SpGetUserDefaultUILanguage();
switch (LangId)
{
case MAKELANGID(LANG_JAPANESE, SUBLANG_DEFAULT):
pchStop = L"}42N86\0b70e50fc0ea0e70fc/05708504608a087046";;
break;
default:
pchStop = L"Stop";
break;
}
return pchStop;
}
int main(int argc, char* argv[])
{
HRESULT hr = E_FAIL;
bool fUseTTS = true; // turn TTS play back on or off
bool fReplay = true; // turn Audio replay on or off
// Process optional arguments
if (argc > 1)
{
int i;
for (i = 1; i < argc; i++)
{
if (_stricmp(argv[i], "-noTTS") == 0)
{
fUseTTS = false;
continue;
}
if (_stricmp(argv[i], "-noReplay") == 0)
{
fReplay = false;
continue;
}
printf ("Usage: %s [-noTTS] [-noReplay] ", argv[0]);
return hr;
}
}
if (SUCCEEDED(hr = ::CoInitialize(NULL)))
{
{
CComPtr cpRecoCtxt;
CComPtr cpGrammar;
CComPtr cpVoice;
hr = cpRecoCtxt.CoCreateInstance(CLSID_SpSharedRecoContext);
if(SUCCEEDED(hr))
{
hr = cpRecoCtxt->GetVoice(&cpVoice);
}
if (cpRecoCtxt && cpVoice &&
SUCCEEDED(hr = cpRecoCtxt->SetNotifyWin32Event()) &&
SUCCEEDED(hr = cpRecoCtxt->SetInterest(SPFEI(SPEI_RECOGNITION), SPFEI(SPEI_RECOGNITION))) &&
SUCCEEDED(hr = cpRecoCtxt->SetAudioOptions(SPAO_RETAIN_AUDIO, NULL, NULL)) &&
SUCCEEDED(hr = cpRecoCtxt->CreateGrammar(0, &cpGrammar)) &&
SUCCEEDED(hr = cpGrammar->LoadDictation(NULL, SPLO_STATIC)) &&
SUCCEEDED(hr = cpGrammar->SetDictationState(SPRS_ACTIVE)))
{
USES_CONVERSION;
const WCHAR * const pchStop = StopWord();
CComPtr cpResult;
printf( "I will repeat everything you say. Say "%s" to exit. ", W2A(pchStop) );
while (SUCCEEDED(hr = BlockForResult(cpRecoCtxt, &cpResult)))
{
cpGrammar->SetDictationState( SPRS_INACTIVE );
CSpDynamicString dstrText;
if (SUCCEEDED(cpResult->GetText(SP_GETWHOLEPHRASE, SP_GETWHOLEPHRASE,
TRUE, &dstrText, NULL)))
{
printf("I heard: %s ", W2A(dstrText));
if (fUseTTS)
{
cpVoice->Speak( L"I heard", SPF_ASYNC, NULL);
cpVoice->Speak( dstrText, SPF_ASYNC, NULL );
}
if (fReplay)
{
if (fUseTTS)
cpVoice->Speak( L"when you said", SPF_ASYNC, NULL);
else
printf (" when you said... ");
cpResult->SpeakAudio(NULL, 0, NULL, NULL);
}
cpResult.Release();
}
if (_wcsicmp(dstrText, pchStop) == 0)
{
break;
}
cpGrammar->SetDictationState( SPRS_ACTIVE );
}
}
}
::CoUninitialize();
}
return hr;
}
