我刚开始学习编程和图像处理。最近我开发了一个系统，可以从视频源中检测人脸并识别人物。如果数据库中已有该人物的信息，系统会在画面中标记其姓名；如果是新人物，系统会要求输入姓名，并拍摄足够的照片存入数据库，以便下次识别。我使用的是Fisher人脸算法来完成这项任务。现在我的问题是，我想让系统能够说话。我希望它能说出它最近识别的人的名字。我可以使用

static class Once { public: Once(){talk();}} Once_; 

来调用talk函数一次，但这并不自然，而且talk函数无法接受用户输入。

请问有人能建议我一个解决方案，或者告诉我从哪里开始解决这个问题吗？

talk函数是这样的

int speech(char* value){ISpVoice * pVoice = NULL;if (FAILED(::CoInitialize(NULL)))    return FALSE;HRESULT hr = CoCreateInstance(CLSID_SpVoice, NULL, CLSCTX_ALL, IID_ISpVoice, (void **)&pVoice);if( SUCCEEDED( hr ) ){    hr = pVoice->Speak(L"userINPUT", SPF_IS_XML, NULL);    pVoice->Release();    pVoice = NULL;}::CoUninitialize();return TRUE;}

回答：

所以，我的提议是：

// -- >8 ---------- speech.h --------------------------#ifndef __speech_onboard__#define __speech_onboard__struct ISpVoice; // fwd ref, since mixing opencv and windows headers is a receipt for desasternamespace Speech{    class Voice    {        ISpVoice * spVoice;    public:        Voice();        ~Voice();        int speak( const char * txt, int flags=0 ) const ;        // Supported values range from -10 to 10         int setRate( int s );        // Supported values range from 0 to 100         int setVolume( int s );    };};#endif // __speech_onboard__// ---- >8 speech.cpp ------------------------------#include <windows.h>#include <sapi.h>#include "speech.h"#define COM_RELEASE(x) { if ((x)) (x)->Release(); (x) = NULL; }namespace Speech{    struct _ComUser    {        _ComUser()  {CoInitialize(0);}        ~_ComUser() {CoUninitialize();}    } _we_need_a_singleton_per_module;    inline int w2a( WCHAR *in, char *out )    {        out[0]=0;        return WideCharToMultiByte(CP_ACP, 0, in, -1, out, MAX_PATH, 0, 0);     }    inline int a2w( const char *in, WCHAR *out )    {        out[0]=0;        return MultiByteToWideChar(CP_ACP, 0, in, -1, out, MAX_PATH);     }    Voice::Voice()        : spVoice(0)    {        HRESULT hr = CoCreateInstance( CLSID_SpVoice, NULL, CLSCTX_INPROC_SERVER, IID_ISpVoice, (LPVOID *)&(spVoice) );     }    Voice::~Voice()    {        COM_RELEASE( spVoice );    }    //SPF_ASYNC = ( 1L << 0 ) ,    //SPF_PURGEBEFORESPEAK  = ( 1L << 1 ) ,    //SPF_IS_FILENAME   = ( 1L << 2 ) ,    //SPF_IS_XML    = ( 1L << 3 ) ,    //SPF_IS_NOT_XML    = ( 1L << 4 ) ,    //SPF_PERSIST_XML   = ( 1L << 5 ) ,    //SPF_NLP_SPEAK_PUNC    = ( 1L << 6 ) ,    //SPF_PARSE_SAPI    = ( 1L << 7 ) ,    //SPF_PARSE_SSML    = ( 1L << 8 ) ,    //SPF_PARSE_AUTODETECT  = 0,    int Voice::speak( const char * txt, int flags ) const     {        if ( ! spVoice )            return 0;        WCHAR wtxt[800];        a2w(txt,wtxt);        ULONG pulstream = 0;        HRESULT hr = spVoice->Speak( wtxt, flags, &pulstream );        return hr==S_OK;     }    // Supported values range from -10 to 10     int Voice::setRate( int s )    {        if ( ! spVoice )            return 0;        HRESULT hr = spVoice->SetRate( s );        return hr==S_OK;     }    // Supported values range from 0 to 100     int Voice::setVolume( int s )    {        if ( ! spVoice )            return 0;        HRESULT hr = spVoice->SetVolume ( s );        return hr==S_OK;     }}// ----- >8 main.cpp --------------------------------------------#include "opencv2/core/core.hpp"#include "opencv2/highgui/highgui.hpp"using namespace cv;#include "speech.h"int main(int argc, char** argv){    Speech::Voice voice;    voice.speak("hello , oh, hello!", 1); // async    Mat img(300,300,CV_8UC3,Scalar(255,0,0));    namedWindow("Display window",0);    putText(img,"lala la",Point(20,120),0,2.5,Scalar(0,200,0),5);    imshow("Display window", img);    waitKey(0);    voice.speak("bye bye, see you later !"); // sync    return 0;}