Determinare CPU use, Physical Memory currently used, Total Physical Memory (RAM)

Salut,

Incerc sa-mi fac un programel in C++ care sa determine lucrurile de mai sus si de ce nu si altele.
Am gasit ceva exemple pe stackoverflow, de exenplu:
CPU currently used:

#include "windows.h"
#include<iostream>
using namespace std;
static ULARGE_INTEGER lastCPU, lastSysCPU, lastUserCPU;
static int numProcessors;
static HANDLE self;
void init() {
SYSTEM_INFO sysInfo;
FILETIME ftime, fsys, fuser;
GetSystemInfo(&sysInfo);
numProcessors = sysInfo.dwNumberOfProcessors;
GetSystemTimeAsFileTime(&ftime);
memcpy(&lastCPU, &ftime, sizeof(FILETIME));
self = GetCurrentProcess();
GetProcessTimes(self, &ftime, &ftime, &fsys, &fuser);
memcpy(&lastSysCPU, &fsys, sizeof(FILETIME));
memcpy(&lastUserCPU, &fuser, sizeof(FILETIME));
}
long double getCurrentValue() {
FILETIME ftime, fsys, fuser;
ULARGE_INTEGER now, sys, user;
long double percent;
GetSystemTimeAsFileTime(&ftime);
memcpy(&now, &ftime, sizeof(FILETIME));
GetProcessTimes(self, &ftime, &ftime, &fsys, &fuser);
memcpy(&sys, &fsys, sizeof(FILETIME));
memcpy(&user, &fuser, sizeof(FILETIME));
percent = (sys.QuadPart - lastSysCPU.QuadPart) +
  (user.QuadPart - lastUserCPU.QuadPart);
percent /= (now.QuadPart - lastCPU.QuadPart);
percent /= numProcessors;
lastCPU = now;
lastUserCPU = user;
lastSysCPU = sys;
return percent * 100;
}
int main()
{
init();
cout << getCurrentValue();
getchar();
return 0;
}

Insa nici nu prea functioneaza (da inf) si as vrea sa incerc eu de la 0.
Insa am cautat pe net dar nu prea am gasit referinte pentru asa ceva. Ma poate indruma cineva cu o carte, pdf, site orice va rog?
Multumesc.

Ai in WinAPI doua mari capitole din care scoti ce vrei de la sistem:
System Information
Windows Management Instrumentation

Edited by neagu_laurentiu, 26 September 2016 - 11:35.

percent /= (now.QuadPart - lastCPU.QuadPart);

now si lastCPU au aceeasi valoare (ceri prea repede timpul a 2-a oara), si ajungi sa imparti la 0.

dani.user, on 26 septembrie 2016 - 20:40, said:

Da cred că acolo era problema, acum nu-mi da infinit îmi dă 0 dar am să mă uit puţin de la ce.

neagu_laurentiu, on 26 septembrie 2016 - 11:30, said:

Mersi