[c++] 擷取實體記憶體和可用虛拟記憶體、記憶體使用率、cpu使用率

擷取記憶體

MEMORYSTATUSEX 函數原型：

typedef struct _MEMORYSTATUSEX {

    DWORD dwLength;

    DWORD dwMemoryLoad;

    DWORDLONG ullTotalPhys;

    DWORDLONG ullAvailPhys;

    DWORDLONG ullTotalPageFile;

    DWORDLONG ullAvailPageFile;

    DWORDLONG ullTotalVirtual;

    DWORDLONG ullAvailVirtual;

    DWORDLONG ullAvailExtendedVirtual;

} MEMORYSTATUSEX, *LPMEMORYSTATUSEX;

MEMORYSTATUSEX statex;
	statex.dwLength = sizeof(statex);
	GlobalMemoryStatusEx(&statex);

	DWORDLONG physical_memory = statex.ullTotalPhys / (1024 * 1024);
	DWORDLONG virtual_memory = (DWORD)statex.ullAvailVirtual / (1024 * 1024);
	DWORDLONG usePhys = physical_memory - (statex.ullAvailPhys / (1024 * 1024));

	float percent_memory = (float)usePhys / (float)physical_memory;
	cout << "記憶體使用率: ";
	printf("%.2f", percent_memory * 100);
	cout << "%" << endl;
	cout << "實體記憶體: " << physical_memory << " MB" << endl;
	cout<<"虛拟記憶體: " << virtual_memory << " MB" << endl;
           

計算cpu：

__int64 CompareFileTime(FILETIME time1, FILETIME time2)		//filetime到const filetime的轉換函數
{
    __int64 a = time1.dwHighDateTime << 32 | time1.dwLowDateTime;
    __int64 b = time2.dwHighDateTime << 32 | time2.dwLowDateTime;

    return   (b - a);
}
int main()
{
    double cpu;
    double idle, kernel, user;
    FILETIME idleTime1, idleTime2;
    FILETIME kernelTime1, kernelTime2;
    FILETIME userTime1, userTime2;
    GetSystemTimes(&idleTime1, &kernelTime1, &userTime1);
    Sleep(50);
    GetSystemTimes(&idleTime2, &kernelTime2, &userTime2);
    idle = (double)CompareFileTime(idleTime1, idleTime2);
    kernel = (double)CompareFileTime(kernelTime1, kernelTime2);
    user = (double)CompareFileTime(userTime1, userTime2);
    if (kernel + user == 0)
    {
    	cpu = 0.0;
    }
    else
    {
    	cpu = (double)((kernel + user - idle) * 100 / (kernel + user));	//（總的時間-空閑時間）/總的時間=占用cpu的時間就是使用率		
    }
    cout << "cpu使用率：";
    printf("%.2f", cpu);
    cout << "%" << endl;
    
    return 0;
}