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rainmeter-studio/Plugins/PluginPerfMon/ObjInst.cpp

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//====================================
// File: OBJINST.CPP
// Author: Matt Pietrek
// From: Microsoft Systems Journal
// "Under the Hood", April 1996
//====================================
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <winperf.h>
#include <stdlib.h>
#pragma hdrstop
#include "titledb.h"
#include "objinst.h"
#include "perfcntr.h"
#include "makeptr.h"
CPerfObjectInstance::CPerfObjectInstance(
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PPERF_INSTANCE_DEFINITION const pPerfInstDef,
PPERF_COUNTER_DEFINITION const pPerfCntrDef,
DWORD nCounters, CPerfTitleDatabase * const pPerfCounterTitles,
BOOL fDummy)
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{
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m_pPerfInstDef = pPerfInstDef;
m_pPerfCntrDef = pPerfCntrDef;
m_nCounters = nCounters;
m_pPerfCounterTitles = pPerfCounterTitles;
m_fDummy = fDummy;
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}
BOOL
CPerfObjectInstance::GetObjectInstanceName(
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PTSTR pszObjInstName, DWORD nSize )
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{
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if ( m_fDummy )
{
*pszObjInstName = 0; // Return an empty string
return FALSE;
}
if ( nSize < (m_pPerfInstDef->NameLength / sizeof(TCHAR)) )
return FALSE;
PWSTR pszName = MakePtr(PWSTR, m_pPerfInstDef, m_pPerfInstDef->NameOffset);
#ifdef UNICODE
lstrcpy( pszObjInstName, pszName );
#else
wcstombs( pszObjInstName, pszName, nSize );
#endif
return TRUE;
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}
CPerfCounter *
CPerfObjectInstance::MakeCounter( PPERF_COUNTER_DEFINITION const pCounterDef )
{
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// Look up the name of this counter in the title database
PTSTR pszName = m_pPerfCounterTitles->GetTitleStringFromIndex(
pCounterDef->CounterNameTitleIndex );
DWORD nInstanceDefSize = m_fDummy ? 0 : m_pPerfInstDef->ByteLength;
// Create a new CPerfCounter. The caller is responsible for deleting it.
return new CPerfCounter(pszName,
pCounterDef->CounterType,
MakePtr( PBYTE, m_pPerfInstDef,
nInstanceDefSize +
pCounterDef->CounterOffset ),
pCounterDef->CounterSize );
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}
CPerfCounter *
CPerfObjectInstance::GetCounterByIndex( DWORD index )
{
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PPERF_COUNTER_DEFINITION pCurrentCounter;
if ( index >= m_nCounters )
return 0;
pCurrentCounter = m_pPerfCntrDef;
// Find the correct PERF_COUNTER_DEFINITION by looping
for ( DWORD i = 0; i < index; i++ )
{
pCurrentCounter = MakePtr( PPERF_COUNTER_DEFINITION,
pCurrentCounter,
pCurrentCounter->ByteLength );
}
if ( pCurrentCounter->ByteLength == 0 )
return 0;
return MakeCounter( pCurrentCounter );
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}
CPerfCounter *
CPerfObjectInstance::GetFirstCounter( void )
{
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m_currentCounter = 0;
return GetCounterByIndex( m_currentCounter );
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}
CPerfCounter *
CPerfObjectInstance::GetNextCounter( void )
{
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m_currentCounter++;
return GetCounterByIndex( m_currentCounter );
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}
CPerfCounter *
CPerfObjectInstance::GetCounterByName( PCTSTR const pszName )
{
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DWORD cntrIdx = m_pPerfCounterTitles->GetIndexFromTitleString(pszName);
if ( cntrIdx == 0 )
return 0;
PPERF_COUNTER_DEFINITION pCurrentCounter = m_pPerfCntrDef;
// Find the correct PERF_COUNTER_DEFINITION by looping and comparing
for ( DWORD i = 0; i < m_nCounters; i++ )
{
if ( pCurrentCounter->CounterNameTitleIndex == cntrIdx )
return MakeCounter( pCurrentCounter );
// Nope. Not this one. Advance to the next counter
pCurrentCounter = MakePtr( PPERF_COUNTER_DEFINITION,
pCurrentCounter,
pCurrentCounter->ByteLength );
}
return 0;
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}