the program runs less than 2 sec - c++

Question

I got this code from MSDN to change the Text to speech and I did all the sitting which were in the tutorial the code works without errors but when I run the code the code run for less than 2 second and then come back to the main code without read the code. my question here is what is the problem exactly?
this is the code:
#include "stdafx.h"
#include <sapi.h>
#include <initguid.h>
int main(int argc, char* argv[])
{
ISpVoice * pVoice = NULL;
if (FAILED(::CoInitialize(NULL)))
return FALSE;
HRESULT hr = CoCreateInstance(__uuidof(SpVoice), NULL, CLSCTX_ALL, __uuidof(SpVoice), (void **)&pVoice);
if( SUCCEEDED( hr ) )
{
hr = pVoice->Speak(L"Hello world", 0, NULL);
hr = pVoice->Speak(L"This sounds normal <pitch middle = '-10'/> but the pitch drops half way through", SPF_IS_XML, NULL );
pVoice->Release();
pVoice = NULL;
}
::CoUninitialize();
return TRUE;
}

Answer 1

Your call to CoCreateInstance() is wrong. You are passing the CLSID of the SpVoice CoClass where the IID of the ISpVoice interface is expected instead (so it should be failing with an E_NOINTERFACE error).
Try this instead:
CoCreateInstance(CLSID_SpVoice, NULL, CLSCTX_ALL, IID_ISpVoice, (void **)&pVoice);
Alternatively:
CoCreateInstance(__uuidof(SpVoice), NULL, CLSCTX_ALL, IID_PPV_ARGS(&pVoice));