GPS and Web Service using C++ ATL/WTL (Windows Mobile 6, Standard)

#pragma once
#include <GPSApi.h>
#include "IGPSSink.h"

class CGPSDevice
{
private:
	//Singleton instance
	static CGPSDevice * s_pInstance;

	//Device handle
	HANDLE m_hGPS_Device;

	//Event for location data updates
	HANDLE m_hNewLocationData;

	//Event for device state changes
	HANDLE m_hDeviceStateChange;

	//Thread's handle and id
	HANDLE m_hThread;
	DWORD m_dwThreadID;

	//Exit event
	HANDLE m_hExitThread;

	//Pointer to sink interface
	IGPSSink * m_pSink;

private:
	//Our wrapper is singleton make constructor private
	CGPSDevice(void);

	HRESULT StartThread();
	HRESULT StopThread();

	static CGPSDevice * Instance();
	static DWORD WINAPI GPSThreadProc(__opt LPVOID lpParameter);
public:

	~CGPSDevice(void);

	static HRESULT TurnOn(IGPSSink * pSink);
	static HRESULT TurnOff();
};