Не воспроизводит запись данных звука

#include "stdafx.h"
#include "windows.h"
#include "mmsystem.h"
#include "iostream.h"
 
#pragma comment (lib,"Winmm.lib")
 
HWAVEIN in;
 
HWAVEOUT out;
 
WAVEHDR wavehdr;
 
 
const Size = 7910;
char buf[Size] = "";
 
main()
{
    WAVEFORMATEX  Format;
 
    Format.wFormatTag = WAVE_FORMAT_PCM;
    Format.wBitsPerSample = 8;
    Format.nChannels = 1;
    Format.nSamplesPerSec = 8000;
    
    waveInOpen(&in,WAVE_MAPPER,&Format,NULL, 0L, CALLBACK_WINDOW);
        
    wavehdr.lpData = buf;
    wavehdr.dwBufferLength = Size;
    wavehdr.dwBytesRecorded = 0;
    wavehdr.dwUser = 0;
    wavehdr.dwFlags = 0;
    wavehdr.dwLoops = 0;
    wavehdr.lpNext = 0;
    wavehdr.reserved = 0;
 
    waveInPrepareHeader(in,&wavehdr,sizeof(WAVEHDR));
    waveInAddBuffer(in,&wavehdr,sizeof(WAVEHDR));
    waveInStart(in);
    Sleep(1000);
    waveInReset(in);
    waveInUnprepareHeader(in,&wavehdr,sizeof(WAVEHDR));
    waveInClose(in);
 
    Sleep(2000);
 
 
 
 
waveOutOpen(&out,WAVE_MAPPER,&Format,NULL, 0L, CALLBACK_WINDOW);
 
 
waveOutPrepareHeader(out,&wavehdr,sizeof(WAVEHDR));
waveOutWrite(out,&wavehdr,sizeof(WAVEHDR));
waveOutReset(out);
waveOutUnprepareHeader(out,&wavehdr,sizeof(WAVEHDR));
 
waveOutClose(out);
 
 
};