// include mmsystem.h
// include math.h
// #pragma comment(lib,"winmm.lib")

WAVEFORMATEX wave;
HWAVEOUT ghwo;
unsigned char *cBuff;
WAVEHDR pwh;

// Create wave with 16 bits per sample and 44100 samples/sec
wave.wFormatTag = WAVE_FORMAT_PCM;
wave.nChannels = 1;
wave.wBitsPerSample = 16;
wave.nSamplesPerSec = 44100;
wave.nBlockAlign = wave.nChannels*wave.wBitsPerSample/8;
wave.nAvgBytesPerSec = wave.nSamplesPerSec*wave.nBlockAlign;
waveOutOpen(&ghwo, WAVE_MAPPER, &wave, NULL, NULL, CALLBACK_NULL);

// Create buffer
cBuff = new unsigned char[44100*2];
pwh.lpData = (LPSTR)cBuff;
pwh.dwBufferLength = 44100*2;
pwh.dwFlags = WHDR_BEGINLOOP;
pwh.dwLoops = 1;
waveOutPrepareHeader(ghwo, &pwh, sizeof(pwh));
pwh.dwFlags = WHDR_BEGINLOOP | WHDR_ENDLOOP | WHDR_PREPARED;
pwh.dwLoops = 2;

// Create signal	
double freq = 500;
double x = freq*3.14159265358979323846/44100;
double amp = 7000;
short int nBuff;
int i,j;
int s = 0;

for(j = 0; j < 10; j++)
{
	for(i = 0; i < 4410; i++)
	{
		nBuff = (int)(sin(i*x) * amp);
		memcpy(cBuff+s, &nBuff, 2);
		s+=2;
	}
	freq += 500;
	x = freq*3.14159265358979323846/44100;
}

// Play sound
waveOutReset(ghwo);
waveOutWrite(ghwo, &pwh, sizeof(WAVEHDR));

Sleep(2000);

waveOutReset(ghwo);
waveOutClose(ghwo);
delete[] cBuff;