ch02-sysinfo/sysinfowindowsimpl.cpp

#include "sysinfowindowsimpl.h"

SysInfoWindowsImpl::SysInfoWindowsImpl() : SysInfo() {}

void SysInfoWindowsImpl::init() {}

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

double SysInfoWindowsImpl::memoryUsed() {
  MEMORYSTATUSEX memoryStatus;
  memoryStatus.dwLength = sizeof(MEMORYSTATUSEX);
  GlobalMemoryStatusEx(&memoryStatus);
  qulonglong memoryPhysicalUsed =
      memoryStatus.ullTotalPhys - memoryStatus.ullAvailPhys;
  return (double)memoryPhysicalUsed / (double)memoryStatus.ullTotalPhys * 100.0;
}