C / C++ / MFC

WAVEFORMATEX	        _oFormat;
LPWAVEFORMATEX	        _pFormat = NULL;
HGLOBAL			_hWaveData;
PCHAR			_pWaveData;
HGLOBAL                 _hWaveHeader;
LPWAVEHDR               _pWaveHeader;
HWAVEOUT		_hOutputDevice = NULL;
DWORD			_nAlignedBufferSize = 0;
MMRESULT		rc = 0;
HANDLE			fileHandle = NULL;
DWORD			size = 0;
DWORD			readBytes = 0;
void*			block = NULL;

	_pFormat = &_oFormat;
	_pFormat->wFormatTag = WAVE_FORMAT_PCM;
	_pFormat->nChannels = 1;
	_pFormat->nSamplesPerSec = 8000;
	_pFormat->wBitsPerSample = 8;
	_pFormat->nBlockAlign = 1;
	_pFormat->nAvgBytesPerSec = 8000;
	_pFormat->cbSize = 0;

	//allocate and lock memory for the buffers...
	_hWaveHeader = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE | GMEM_ZEROINIT, (DWORD)sizeof(WAVEHDR));
	if(!_hWaveHeader) return false;
	_pWaveHeader = (LPWAVEHDR) GlobalLock(_hWaveHeader);
	if(!_pWaveHeader) return false;
	_hWaveData = GlobalAlloc(GMEM_MOVEABLE | GMEM_SHARE, AUDIO_BUFFER_SIZE);
	if(!_hWaveData) return false;
	_pWaveHeader->lpData = _pWaveData = (LPSTR)GlobalLock(_hWaveData);

	//open suitable device for output(input or outpur)
	rc = waveOutOpen(&_hOutputDevice, WAVE_MAPPER,_pFormat, (DWORD) &waveOutProc, 0, CALLBACK_FUNCTION);
	if (rc!=MMSYSERR_NOERROR)
		MessageBox(NULL,"Error:","",NULL);

	//creating file to read from.....ringout, the same file from c:\windows\media\ringout.wav
	if ((fileHandle = CreateFile("\sounds\\ringout.wav", GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,0,NULL)) == INVALID_HANDLE_VALUE)
		return NULL;

	do {
		if( (size = GetFileSize(fileHandle,NULL)) == 0)
			break;

		if ( (block = HeapAlloc(GetProcessHeap(), 0, size)) == NULL)
			break;

		ReadFile(fileHandle, block, size, &readBytes, NULL);
	} while(0);

	CloseHandle(fileHandle);
	CopyMemory(_pWaveHeader, &block, sizeof(block));

	// prepare buffers and pass to output device
	_nAlignedBufferSize = (AUDIO_BUFFER_SIZE - AUDIO_BUFFER_SIZE % _pFormat->nBlockAlign ); //buffer size
	_pWaveHeader->dwFlags = 0;
	_pWaveHeader->dwBufferLength = _nAlignedBufferSize;
	rc = waveOutPrepareHeader(_hOutputDevice, _pWaveHeader, sizeof(WAVEHDR));


	rc = waveOutWrite(_hOutputDevice, _pWaveHeader, sizeof(WAVEHDR));