Can not access to events when Speak to a wav file in C++

 CSpStreamFormat OriginalFmt;
    hr = m_cpVoice->GetOutputStream( &cpOldStream );
    if (hr == S_OK)
    {
        hr = OriginalFmt.AssignFormat(cpOldStream);
    }
    else
    {
        hr = E_FAIL;
    }
    // User SAPI helper function in sphelper.h to create a wav file
    if (SUCCEEDED(hr))
    {
        hr = SPBindToFile( m_szWFileName, SPFM_CREATE_ALWAYS, &cpWavStream, &OriginalFmt.FormatId(), OriginalFmt.WaveFormatExPtr() );
    }
    if( SUCCEEDED( hr ) )
    {
        // Set the voice's output to the wav file instead of the speakers
        hr = m_cpVoice->SetOutput(cpWavStream, TRUE);
    }

    if ( SUCCEEDED( hr ) )
    {
        // Do the Speak
        HandleSpeak(aux_entrada,pitch, speed, volume, true, wsVoice, true);  // process events
    }

    m_cpVoice->WaitUntilDone( INFINITE );
    cpWavStream.Release();