C++语音识别

visual c++ 创建Win32工程调用windows API 做语音识别。查找了很多资料，但是很少用Win32的，国外倒是有很多人用C#调用Windows API 做语音识别。很多结合语音识别与word结合，把识别的语音写在word文档上，由于我不是C#喜好者，所以没有查找实现那些的source code。

代码如下：

// SpeechToTextTest2.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "SpeechToTextTest2.h"
#include<Windows.h>
#include<WinUser.h>
#include <sphelper.h>
#include <string>
//#include "Resource.h"
#define WM_RECOEVENT    WM_USER+1
#define ID_START_RECOG 13

BOOL CALLBACK DlgProc(HWND hWnd, UINT Message, WPARAM wParam, LPARAM lParam);
void LaunchRecognition(HWND hWnd);
void HandleEvent(HWND hWnd);
WCHAR *ExtractInput(CSpEvent event);
void CleanupSAPI();

CComPtr<ISpRecognizer> g_cpEngine;
CComPtr<ISpRecoContext> g_cpRecoCtx;
CComPtr<ISpRecoGrammar> g_cpRecoGrammar;
WCHAR *lpszBuffer;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
	// allocating memory for buffer this buffer is used to store
	// the text during the speech recognition process
	lpszBuffer = new WCHAR[MAX_PATH];
	lpszBuffer[0] = 0;

	DialogBox(hInstance, MAKEINTRESOURCE(IDD_DIALOG12), NULL, DlgProc);
	// freeing the memory that was allocated for the buffer
	delete[] lpszBuffer;
	return 0;
}

BOOL CALLBACK DlgProc(HWND hWnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
	switch (Message)
	{
	case WM_RECOEVENT:
		HandleEvent(hWnd);
		break;
	case WM_COMMAND:
		switch (LOWORD(wParam))
		{
		case IDC_BUTTON1:
			LaunchRecognition(hWnd);
			break;
		}
		break;
	case WM_CLOSE:
		CleanupSAPI();
		EndDialog(hWnd, 0);
		break;
	default:
		return FALSE;
	}
	return TRUE;
}

void LaunchRecognition(HWND hWnd)
{
	if (FAILED(::CoInitialize(NULL)))
	{
		throw std::string("Unable to initialise COM objects");
	}

	ULONGLONG ullGramId = 1;
	HRESULT hr = g_cpEngine.CoCreateInstance(CLSID_SpSharedRecognizer);
	if (FAILED(hr))
	{
		throw std::string("Unable to create recognition engine");
	}

	hr = g_cpEngine->CreateRecoContext(&g_cpRecoCtx);
	if (FAILED(hr))
	{
		throw std::string("Failed command recognition");
	}

	hr = g_cpRecoCtx->SetNotifyWindowMessage(hWnd, WM_RECOEVENT, 0, 0);
	if (FAILED(hr))
	{
		throw std::string("Unable to select notification window");
	}

	const ULONGLONG ullInterest = SPFEI(SPEI_SOUND_START) | SPFEI(SPEI_SOUND_END) |
		SPFEI(SPEI_PHRASE_START) | SPFEI(SPEI_RECOGNITION) |
		SPFEI(SPEI_FALSE_RECOGNITION) | SPFEI(SPEI_HYPOTHESIS) |
		SPFEI(SPEI_INTERFERENCE) | SPFEI(SPEI_RECO_OTHER_CONTEXT) |
		SPFEI(SPEI_REQUEST_UI) | SPFEI(SPEI_RECO_STATE_CHANGE) |
		SPFEI(SPEI_PROPERTY_NUM_CHANGE) | SPFEI(SPEI_PROPERTY_STRING_CHANGE);
	hr = g_cpRecoCtx->SetInterest(ullInterest, ullInterest);
	if (FAILED(hr))
	{
		throw std::string("Failed to create interest");
	}

	hr = g_cpRecoCtx->CreateGrammar(ullGramId, &g_cpRecoGrammar);
	if (FAILED(hr))
	{
		throw std::string("Unable to create grammar");
	}

	hr = g_cpRecoGrammar->LoadDictation(0, SPLO_STATIC);
	if (FAILED(hr))
	{
		throw std::string("Failed to load dictation");
	}

	hr = g_cpRecoGrammar->SetDictationState(SPRS_ACTIVE);
	if (FAILED(hr))
	{
		throw std::string("Failed setting dictation state");
	}
}

void HandleEvent(HWND hWnd)
{
	CSpEvent event;
	WCHAR  *pwszText;

	// Loop processing events while there are any in the queue
	while (event.GetFrom(g_cpRecoCtx) == S_OK)
	{
		switch (event.eEventId)
		{
		case SPEI_HYPOTHESIS:
		{
			pwszText = ExtractInput(event);
			MessageBoxW(NULL, pwszText, L"text", MB_ICONERROR);
			wcscat(lpszBuffer, pwszText);
			wcsncat(lpszBuffer, L"\r\n", 2);
			SetDlgItemTextW(hWnd, IDC_EDIT1, lpszBuffer);
		}
		break;
		}
	}
}

WCHAR *ExtractInput(CSpEvent event)
{
	HRESULT                   hr = S_OK;
	CComPtr<ISpRecoResult>    cpRecoResult;
	SPPHRASE                  *pPhrase;
	WCHAR                     *pwszText;

	cpRecoResult = event.RecoResult();

	hr = cpRecoResult->GetPhrase(&pPhrase);

	if (SUCCEEDED(hr))
	{
		if (event.eEventId == SPEI_FALSE_RECOGNITION)
		{
			pwszText = L"False recognition";
			//MessageBoxW(NULL, pwszText, L"text", MB_ICONERROR);
		}
		else
		{
			// Get the phrase's entire text string, including replacements.
			hr = cpRecoResult->GetText(SP_GETWHOLEPHRASE, SP_GETWHOLEPHRASE, TRUE, &pwszText, NULL);
		}
	}
	CoTaskMemFree(pPhrase);
	return pwszText;
}

void CleanupSAPI()
{
	if (g_cpRecoGrammar)
	{
		g_cpRecoGrammar.Release();
	}
	if (g_cpRecoCtx)
	{
		g_cpRecoCtx->SetNotifySink(NULL);
		g_cpRecoCtx.Release();
	}
	if (g_cpEngine)
	{
		g_cpEngine.Release();
	}
	CoUninitialize();
}

运行结果如下：

代码参考

C++ Speech Recognition：https://www.codeproject.com/Tips/784140/Cplusplus-Speech-Recognition

点进去看这个文章后，你会发现有一堆问都文件问题的人，无法编译通过，因为源工程已经不存在了，.cpp而没有头文件部分。经过一番摸索，我实现了如上。

博客里面也只有.cpp部分，由于csdn下载文件要积分。所以就不上传了源工程了。

如果觉得有参考价值、需要源文件的同志，可以email我，邮箱：[email protected]

还要提醒的是，我只是实现了，源博客APP的实现问题。