// RTTimerP.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "windows.h"
#include "Tlhelp32.h"
#include "pkfuncs.h"
#include "RTTimerDll.h"


UINT timerID;
UINT timerInterval=	10; //default 10ms
DWORD dwTotalTick=0;

LARGE_INTEGER nFreq;
LARGE_INTEGER TimerTick;
DWORD TimerISTNum=0;

/*
 Sharememory_UINT32
 Address:
  0: The average of time span of twice calllback function called by periodically upon expiration of real-time timer1 (unit:milliseconds)
  1: The minimum of time span of twice calllback function called by periodically upon expiration of real-time timer1 (unit:milliseconds)
  2: The maximum of time span of twice calllback function called by periodically upon expiration of real-time timer1 (unit:milliseconds)
 10: Records the starting time difference of 2 program (RTTPrj.exe and RTTimerP.exe)
*/
void GetMinTick(DWORD dwtick)
{	
	DWORD dwvalue;

	RTT_ReadDWORD(1,&dwvalue);
	if(dwtick<dwvalue)
		RTT_WriteDWORD(1,dwtick);
}
void GetMaxTick(DWORD dwtick)
{
	DWORD dwvalue;

	RTT_ReadDWORD(2,&dwvalue);
	if(dwtick>dwvalue)
		RTT_WriteDWORD(2,dwtick);
}
void GetAvgTick(DWORD dwtick)
{
	DWORD dwvalue;
	if(TimerISTNum>=8000)
	{
		dwTotalTick=0;
		RTT_WriteDWORD(0,0);
		TimerISTNum=1;
	}
	else
		TimerISTNum++;

	dwTotalTick+=dwtick;
	dwvalue=(DWORD)((double)(dwTotalTick/TimerISTNum));
	RTT_WriteDWORD(0,dwvalue);
}
void CALLBACK CallProc(UINT   uID,   UINT   uMsg,DWORD   dwUser,DWORD   dw1,DWORD   dw2)
{	
	LARGE_INTEGER nEndTime;
	DWORD dwvalue;

	QueryPerformanceCounter(&nEndTime);		
	
	double ddiff=(double)(nEndTime.QuadPart-TimerTick.QuadPart)*1000*1000/(double)nFreq.QuadPart;
	
	if(dwTotalTick)
	{
		GetMinTick((DWORD)ddiff);	
		GetMaxTick((DWORD)ddiff);
	}
	GetAvgTick((DWORD)ddiff);		

	QueryPerformanceCounter(&TimerTick);	
}


int _tmain(int argc, _TCHAR* argv[])
{
    HANDLE hMutex = CreateMutex(NULL, false, L"USERTTIMER");

    if (GetLastError() == ERROR_ALREADY_EXISTS)
    {
        CloseHandle(hMutex);
        return -1;
    }

	RTT_WriteDWORD(10,GetTickCount()); //Save RTTimerP start time tick value to the share memory slot 10 of DWORD data

	if(argc>1)
	{		
		timerInterval=_wtoi(argv[1]);		
	
		QueryPerformanceFrequency(&nFreq);
		/*Initialize the global variables*/
		RTT_WriteDWORD(0,0);
		RTT_WriteDWORD(1,0xFFFFFFFF);
		RTT_WriteDWORD(2,0);

		HANDLE hConnect = CreateEvent(NULL, TRUE, FALSE, L"CLOSERTTIMER");

		timeBeginPeriod(1);

		//call timeSetEvent and input user setting value for create time event	
		timerID = timeSetEvent(timerInterval,1, CallProc, 0 ,TIME_PERIODIC);
		QueryPerformanceCounter(&TimerTick);

		WaitForSingleObject(hConnect, INFINITE);
		Sleep(1);
		timeKillEvent(timerID);
		timeEndPeriod(1);	
		
	}
	else
		printf("Invalid parameter\r\n");

	return 0;
}