Morse code. Some examples of how to produce sounds.

// AlexfSnd.h: interface for the CAlexfSnd class.
// Part of "Morse" project. (C) Alexander Fedorov, 2000. lamer2000@hotmail.com
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_ALEXFSND_H__950F8104_A353_11D2_9864_E7C799AF3D43__INCLUDED_)
#define AFX_ALEXFSND_H__950F8104_A353_11D2_9864_E7C799AF3D43__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include <mmsystem.h>

#pragma comment(lib,"winmm.lib")

#define ALEXF_PLAY_BUF 10
#define ALEXF_PLAY_SPS 44100

#define PCM_STAGE_FREE			0
#define PCM_STAGE_MARK_TO_FILL	1
#define PCM_STAGE_PLAY_NOW		2

class CAlexfPCM
{
public:
	WAVEHDR whdr;
	int iStage;
	long lFreq;
	double dDelay;
	long lNext;
	char * WaveBuf;

public:
	CAlexfPCM();
	virtual ~CAlexfPCM();

	static void FillSinus08(
	char* pBuf,			// buffer address
	int iBufLen,		// buffer size
	int iSPS,			// frequency (Samples Per Second)
	double fFreq);		// frequency, Hz

	BOOL CreateSinus08Sample();
	BOOL ResizeBuf(long lNewSize);

};

class CAlexfAsyncPlay2
{
	BOOL bOK;
	int SPS;			// Samples Per Sec
	WAVEFORMATEX wfme;
	HWAVEOUT hwout;
	MMRESULT mmres;
	static void CALLBACK CallbackWaveOutProc(HWAVEOUT hwo,
	UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2);

	CAlexfPCM * pcm;

	static CAlexfAsyncPlay2 * ziz;

	int GetFreeBuf();
	int GetBusyBufferNumber();
	void ReleaseBuf(WAVEHDR * lpwhdr);
	
public:
	CAlexfAsyncPlay2();
	virtual ~CAlexfAsyncPlay2();
	BOOL AddSingleSound(long Freq, double Delay);
	BOOL IsOK() {return bOK;}
};

class CAlexfAsyncPlay
{
	BOOL bOK;
	int SPS;			// Samples Per Sec
	WAVEFORMATEX wfme;
	HWAVEOUT hwout;
	MMRESULT mmres;
	static void CALLBACK CallbackWaveOutProc(HWAVEOUT hwo,
	UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2);

	CAlexfPCM * pcm;

	long lLastPCM;
	
	int GetFreeBuf();
	void ReleaseBuf(WAVEHDR * lpwhdr);
	int GetBusyBufferNumber();

	static CAlexfAsyncPlay * ziz;

	static DWORD WINAPI ThreadFunc(LPVOID lpThreadParameter);
	HANDLE hThread;
	CRITICAL_SECTION csCriticalSection;
	BOOL bStopThreadNow;
	BOOL StopThread();

public:
	CAlexfAsyncPlay();
	virtual ~CAlexfAsyncPlay();
	BOOL AddSingleSound(long Freq, double Delay);
	BOOL IsOK() {return bOK;}
};

class CAlexfSyncPlay
{
public:
	WAVEFORMATEX wfme;
	MMRESULT mmres;
	HWAVEOUT hwout;
	WAVEHDR whdr;
	char * WaveBuf;
	double dDuration;
	double dFreq;
	void FillSinus08(
	unsigned char* pBuf,
	int iBufLen,
	int iSPS,
	double fFreq);
	static void CALLBACK WaveOut_waveOutProc(HWAVEOUT hwo, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2);
	BOOL Beep();

public:
	int SPS;				// Samples Per Sec
	CAlexfSyncPlay(BOOL bSoundOn = FALSE);
	virtual ~CAlexfSyncPlay();

	BOOL Beep08(double Freq, double Delay);
};

#endif // !defined(AFX_ALEXFSND_H__950F8104_A353_11D2_9864_E7C799AF3D43__INCLUDED_)