sysinfowindowsimpl.cpp

#include "sysinfowindowsimpl.h"
#include <windows.h>
#include <QtGlobal>

SysInfoWindowsImpl::SysInfoWindowsImpl():
    SysInfo(), mCpuLoadLastValues()
{

}

void SysInfoWindowsImpl::init()
{
    mCpuLoadLastValues = cpuRawData();
}

double SysInfoWindowsImpl::cpuLoadAverage()
{
    QVector<qulonglong> firstSample = mCpuLoadLastValues;
    QVector<qulonglong> secondSample = cpuRawData();
    mCpuLoadLastValues = secondSample;


    qulonglong currentIdle = secondSample[0] - firstSample[0];
    qulonglong currentKernel = secondSample[1] - firstSample[1];
    qulonglong currentUser = secondSample[2] - firstSample[2];

    qulonglong currentSystem = currentUser + currentKernel;

    double percent = (currentSystem - currentIdle)*100/currentSystem;
    return qBound(0.0,percent,100.0);
}

double SysInfoWindowsImpl::memoryUsed()
{
    MEMORYSTATUSEX memoryStatus;
    memoryStatus.dwLength = sizeof(MEMORYSTATUSEX);
    GlobalMemoryStatusEx(&memoryStatus);
    qulonglong memoryPhysicalUsed =
            (double)memoryStatus.ullTotalPhys - (double)memoryStatus.ullAvailPhys;
    return memoryPhysicalUsed/memoryStatus.ullTotalPhys * 100;
}

QVector<qulonglong> SysInfoWindowsImpl::cpuRawData()
{
    FILETIME idleTime;
    FILETIME kernelTime;
    FILETIME userTime;

    GetSystemTimes(&idleTime, &kernelTime, &userTime);
    QVector<qulonglong> rawData;

    rawData.append(convertFileTime(idleTime));
    rawData.append(convertFileTime(kernelTime));
    rawData.append(convertFileTime(userTime));
return rawData;
}

qulonglong SysInfoWindowsImpl::convertFileTime(const FILETIME &filetime) const
{
    ULARGE_INTEGER largeInteger;
    largeInteger.LowPart = filetime.dwLowDateTime;
    largeInteger.HighPart = filetime.dwHighDateTime;
    return largeInteger.QuadPart;
}