Error in Generating Voice using SAPI 5.1

hi,

i am using Microsoft Speech SDK 5.1,
(WindowsXP, VC++ IDE)


I have wrote program which Speaks as per Given Text, but i m getting errors.

My code is

#include <stdio.h>
#include <conio.h>
#include <sapi.h>
#include <objbase.h>

int main()
{

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();

getch();

return 0;
}

Errors are :

1)

error C2039: 'Speak' : is not a member of 'ISpVoice'
c:\program files\microsoft speech sdk 5.1\include\sapi.h(6992) : see declaration of 'ISpVoice'

2) error C2039: 'Release' : is not a member of 'ISpVoice'
c:\program files\microsoft speech sdk 5.1\include\sapi.h(6992) : see declaration of 'ISpVoice'


i am new in Multimedia area. i want to know that is it possible to generate Wave file using C code. can anybody guide me, or provide me link from where i can get better idea to generate wave file using C