I'm begging for help: How to use SAPI in C?

Hello everyone,

I have searched all around the Internet for the last 4 hours(!) and still cannot find a single answer to my problem:

I need to do Text-To-Speech on Windows from withing C code. All of the examples for SAPI programming are that I have found were in C++ or C#. Some people in other posts online claimed to use SAPI from C, but I found no actual example.

Please, show me a simple example on how to say something using SAPI in C code. I really need this and after 4 hours of googling I'm exhausted. Need your help.

So what´s wrong with
Text-to-Speech Tutorial (SAPI 5.3)

If you know that :: is the C++ scope operator, and you can delete it for a C program, does it work?

What is going to be real hard work is dealing with COM in a C program.

Tried reading Speech API documentation on MSDN, I assume?

Tried or Tired?

Hey, it´s only a typo ;)

First of all, thank you very much for replying, people.


I have read the SAPI SDK help. In fact, I am trying to at least compile the code mintioned in Text-to-Speech Tutorial (SAPI 5.3) at "Step 4":

This code works in C++:

Code:

---

#include <stdafx.h>
#include <sapi.h>

int main(int argc, char* argv[])
{
    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"Hello world", 0, NULL);
        pVoice->Release();
        pVoice = NULL;
    }

    ::CoUninitialize();
    return TRUE;
}

---

The closest "translation" of the code above into C code as following (this produces the least amount of errors during compiling so far):

Code:

---

#include <sapi.h>
int main(int argc, char* argv[])
{
    HRESULT hr;

    ISpVoice *pVoice = NULL;


    if (FAILED(CoInitialize(NULL)))
        printf("Error to intiliaze COM");
    else
        printf("ISpVoice Initialized\n\n");
   

    hr = CoCreateInstance(&CLSID_SpVoice, NULL, CLSCTX_ALL, &IID_ISpVoice, (void **)&pVoice);
    if(SUCCEEDED(hr))
    {
        hr = pVoice->Speak("Hello world", SPF_DEFAULT, NULL);

        if ( pVoice != NULL )
            pVoice->Release();

        pVoice = NULL;
    }
    CoUninitialize();

    return 0;
}

---

When compiling the second blob of code above I get two errors:

Code:

---

error C2039: 'Speak' : is not a member of 'ISpVoice'
and
error C2039: 'Release' : is not a member of 'ISpVoice'

---

and I tried and tried and I can't get it to work in C in any way.


[EDIT]: and if I use just

Code:

---

...
 hr = Speak("Hello world", SPF_DEFAULT, NULL);
...

---

then it says "Speak()" is undefined. Same with "Release()" function.

Code:

---

#define COBJMACROS
#include <sapi.h>
#include <ole2.h>

int main(int argc, char* argv[])
{
    ISpVoice * pVoice = NULL;
    HRESULT hr;

    if (FAILED(CoInitialize(NULL)))
        return FALSE;

    hr = CoCreateInstance(&CLSID_SpVoice, NULL, CLSCTX_ALL, &IID_ISpVoice, (void **)&pVoice;);
    if( SUCCEEDED( hr ) )
    {
//
// With COBJMACROS defined, you can do this
//
        hr = ISpVoice_Speak(pVoice, L"Hello world", 0, NULL);
//
// Otherwise, you have to go through the vtable manually
//
//    hr = pVoice->lpVtbl->Speak(L"Hello world", 0, NULL);
        ISpVoice_Release(pVoice);
        pVoice = NULL;
    }

    CoUninitialize();
    return TRUE;
}

---

Adeyblue, thank you very very very much! It works perfectly. There's no way I could have gotten to this solution by myself.

Once more, thank you!