C++ MSAPI 5:SetNotifyCallbackFunction 不起作用

2022-01-15 00:00:00 events sapi event-handling c++ speech-synthesis

所以我尝试了 MSAPI 5.4 TTS 与事件示例.现在，我创建了一个使用 SetNotifyCallbackFunction 的 cmd 提示应用程序，但没有调用我传递的函数.我不是 C++ 专家，所以我很难解决这个问题，谁能指出我正确的方向，或者至少给我一个 SetNotifyCallbackFunction 的好例子?

So I've tried the MSAPI 5.4 TTS with event example. Now I create an cmd prompt app that utilize the SetNotifyCallbackFunction but the function that I've pass is not being called. I'm not an expert in C++ so I am having difficulty in solving this one, can anyone point me in the right direction or at least give me a good example of SetNotifyCallbackFunction?

这是我的代码的简化版本:

Here is a simplified version of my code:

typedef void __stdcall SPNOTIFYCALLBACK(WPARAM wParam, LPARAM lParam);

void __stdcall outsideeventFunction(WPARAM, LPARAM);

void __stdcall outsideeventFunction(WPARAM wParam, LPARAM lParam){
    std::cout << "Event called::wParam: " << wParam << " lParam: " << lParam << std::endl;
    SPEVENT eventItem;
    memset(&eventItem, 0, sizeof(SPEVENT));
    while (SUCCEEDED(pV->GetEvents(1, &eventItem, NULL)))
    {
        bool exitNa = false;
        switch (eventItem.eEventId)
        {
        case SPEI_WORD_BOUNDARY:
            SPVOICESTATUS eventStatus;
            pV->GetStatus(&eventStatus, NULL);
            ULONG start, end;
            start = eventStatus.ulInputWordPos;
            end = eventStatus.ulInputWordLen;
            std::cout << "From event Test: " << start << ", " << end << std::endl;
            std::cout << "From event Length: " << theString.length() - 1 << ", " << start + end << std::endl;
            if (theString.length() - 1 <= start + end){
                std::cout << "From event Exit!" << std::endl;
                exitNa = true;
            }
            break;
        }

        SpClearEvent(&eventItem);
        if (exitNa){
            break;
        }
    }
    return;
}

int _tmain(int argc, TCHAR* argv [], TCHAR* envp [])
{
    pV = NULL;
    std::string nativeString("Hello world, this is a test! For the purpose of a longer message, I'll add another sentence. And here comes the new sentence.");
    SPNOTIFYCALLBACK *cb = &outsideeventFunction;
    if (FAILED(::CoInitialize(NULL)))
        return FALSE;

    HRESULT hr = CoCreateInstance(CLSID_SpVoice, NULL, CLSCTX_ALL, IID_ISpVoice, (void **) &pV);
    if (SUCCEEDED(hr))
    {
        if (SUCCEEDED(pV->SetNotifyCallbackFunction(cb, 0, 0))){
            std::cout << "Success adding callback" << std::endl;
        }

        ULONGLONG ullMyEvents = SPFEI(SPEI_WORD_BOUNDARY);
        pV->SetInterest(ullMyEvents, ullMyEvents);
    }

    theString = std::wstring(nativeString.begin(), nativeString.end());

    printf("Speak: %s
", nativeString.c_str());
    hr = pV->Speak(theString.c_str(), SPF_ASYNC, NULL);
    pV->WaitUntilDone(INFINITE);

    std::system("pause");
    pV->Release();
    pV = NULL;
    ::CoUninitialize();
    return TRUE;
}

这个应用程序的结果是单词的合成很顺利，但是从来没有调用过outsideeventFunction.如您所见， SetInterest 已正确设置.我该如何解决这个问题?

The result of this app is that the synthesizing of words are done smoothly, but the outsideeventFunction is never been called. As you can see the SetInterest is properly set. How I can fix this?

推荐答案

两个问题:

1) SAPI 不允许您重新分配事件目标，因此行

1) SAPI doesn't let you reassign event targets, so the line

pV->SetNotifyWin32Event();

总会失败.

2) 您需要泵送消息以传递事件.所以不要调用

2) You need to pump messages to get events delivered. So instead of calling 

pV->WaitUntilDone(INFINITE);

在设置事件之前，您需要获取句柄和泵送消息:

you need to get the handle and pump messages until the event is set:

HANDLE hWait = pV->SpeakCompleteEvent();
WaitAndPumpMessagesWithTimeout(hWait, INFINITE);

HRESULT WaitAndPumpMessagesWithTimeout(HANDLE hWaitHandle, DWORD dwMilliseconds)
{
    HRESULT hr = S_OK;
    BOOL fContinue = TRUE;

    while (fContinue)
    {
        DWORD dwWaitId = ::MsgWaitForMultipleObjectsEx(1, &hWaitHandle, dwMilliseconds, QS_ALLINPUT, MWMO_INPUTAVAILABLE);
        switch (dwWaitId)
        {
        case WAIT_OBJECT_0:
            {
                fContinue = FALSE;
            }
            break;

        case WAIT_OBJECT_0 + 1:
            {
                MSG Msg;
                while (::PeekMessage(&Msg, NULL, 0, 0, PM_REMOVE))
                {
                    ::TranslateMessage(&Msg);
                    ::DispatchMessage(&Msg);
                }
            }
            break;

        case WAIT_TIMEOUT:
            {
                hr = S_FALSE;
                fContinue = FALSE;
            }
            break;

        default:// Unexpected error
            {
                fContinue = FALSE;
                hr = E_FAIL;
            }
            break;
        }
    }
    return hr;
}

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