float GetCPUUsageWin32()
{
CPerfCounters<LONGLONG> PerfCounters;
DWORD dwObjectIndex = PROCESS_OBJECT_INDEX;
DWORD dwCpuUsageIndex = PROCESSOR_TIME_COUNTER_INDEX;
int CpuUsage = 0;
LONGLONG lnNewValue = 0;
PPERF_DATA_BLOCK pPerfData = NULL;
LARGE_INTEGER NewPerfTime100nSec = {0};
lnNewValue = PerfCounters.GetCounterValueForProcessID(&pPerfData, dwObjectIndex, dwCpuUsageIndex, GetCurrentProcessId());
NewPerfTime100nSec = pPerfData->PerfTime100nSec;
if (m_bFirstTime)
{
m_bFirstTime = false;
m_lnOldValue = lnNewValue;
m_OldPerfTime100nSec = NewPerfTime100nSec;
return 0;
}
LONGLONG lnValueDelta = lnNewValue - m_lnOldValue;
double DeltaPerfTime100nSec = (double)NewPerfTime100nSec.QuadPart - (double)m_OldPerfTime100nSec.QuadPart;
m_lnOldValue = lnNewValue;
m_OldPerfTime100nSec = NewPerfTime100nSec;
double a = (double)lnValueDelta / DeltaPerfTime100nSec;
a /= double(number_of_cpus);
return (a * 100);
}
double CCpuUsage::GetCpuUsage(DWORD dwProcessID)
{
static PLATFORM Platform = GetPlatform();
if (m_bFirstTime)
EnablePerformaceCounters();
// Cpu usage counter is 8 byte length.
CPerfCounters<LONGLONG> PerfCounters;
DWORD dwObjectIndex = PROCESS_OBJECT_INDEX;
DWORD dwCpuUsageIndex = PROCESSOR_TIME_COUNTER_INDEX;
double CpuUsage = 0;
LONGLONG lnNewValue = 0;
PPERF_DATA_BLOCK pPerfData = NULL;
LARGE_INTEGER NewPerfTime100nSec = {0};
lnNewValue = PerfCounters.GetCounterValueForProcessID(&pPerfData, dwObjectIndex, dwCpuUsageIndex, dwProcessID);
NewPerfTime100nSec = pPerfData->PerfTime100nSec;
if (m_bFirstTime)
{
m_bFirstTime = false;
m_lnOldValue = lnNewValue;
m_OldPerfTime100nSec = NewPerfTime100nSec;
return 0;
}
LONGLONG lnValueDelta = lnNewValue - m_lnOldValue;
double DeltaPerfTime100nSec = (double)NewPerfTime100nSec.QuadPart - (double)m_OldPerfTime100nSec.QuadPart;
m_lnOldValue = lnNewValue;
m_OldPerfTime100nSec = NewPerfTime100nSec;
if (DeltaPerfTime100nSec == 0)
return 0;
double a = (double)lnValueDelta / DeltaPerfTime100nSec;
CpuUsage = (double) (a*100);
if (CpuUsage < 0)
return 0.00;
return CpuUsage;
}