#include <iostream>
#include <windows.h>
#include <Psapi.h>

using namespace  std;

__int64 CompareFileTime(FILETIME t1,FILETIME t2)
{
	__int64 a = t1.dwHighDateTime << 32 | t1.dwLowDateTime;
	__int64 b = t2.dwHighDateTime << 32 | t2.dwLowDateTime;
	return (b - a);
}
int GetCpuUsage()
{
	HANDLE hEvent;
	FILETIME preidleTime;
	FILETIME prekernelTime;
	FILETIME preuserTime;
	FILETIME idleTime;
	FILETIME kernelTime;
	FILETIME userTime;

	GetSystemTimes(&idleTime, &kernelTime, &userTime);
	preidleTime = idleTime;
	prekernelTime = kernelTime;
	preuserTime = userTime;

	hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
	WaitForSingleObject(hEvent, 500);
	GetSystemTimes(&idleTime, &kernelTime, &userTime);
	__int64 idle = CompareFileTime(preidleTime, idleTime);
	__int64 kernel = CompareFileTime(prekernelTime, kernelTime);
	__int64 user = CompareFileTime(preuserTime, userTime);

	__int64 iCpuUsage = -1;
	iCpuUsage = (kernel + user - idle) * 100 / (kernel + user);
	return iCpuUsage;
}
int main()
{
	//獲取系統記憶體使用率
	MEMORYSTATUS ms;
	GlobalMemoryStatus(&ms);
	cout << "Mem usage = " << ms.dwMemoryLoad << endl;
	//獲取程序的記憶體（Private Bytes）
	PROCESS_MEMORY_COUNTERS pmc;
	GetProcessMemoryInfo(GetCurrentProcess(), &pmc, sizeof(PROCESS_MEMORY_COUNTERS));
	cout << "Current Process Mem usage = " << pmc.PagefileUsage << endl;
	//獲取當前系統的CPU利用率
	__int64 iCpuUsage = GetCpuUsage();
	cout << "CPU usage = " << iCpuUsage << endl;
	return 0;
}