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rainmeter-studio/Plugins/PluginPerfMon/ObjList.cpp

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//====================================
// File: OBJLIST.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 "objlist.h"
#include "perfobj.h"
#include "makeptr.h"
CPerfObjectList::CPerfObjectList(
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CPerfSnapshot * const pPerfSnapshot,
CPerfTitleDatabase * const pPerfTitleDatabase )
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{
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m_pPerfSnapshot = pPerfSnapshot;
m_pPerfCounterTitles = pPerfTitleDatabase;
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}
CPerfObject *
CPerfObjectList::GetFirstPerfObject( void )
{
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m_currentObjectListIndex = 0;
if ( m_currentObjectListIndex >= m_pPerfSnapshot->GetNumObjectTypes() )
return 0;
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m_pCurrObjectType =
(PPERF_OBJECT_TYPE)m_pPerfSnapshot->GetPostHeaderPointer();
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return new CPerfObject( m_pCurrObjectType, m_pPerfCounterTitles );
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}
CPerfObject *
CPerfObjectList::GetNextPerfObject( void )
{
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// Are we at the last object in the list? Return NULL if so.
if ( ++m_currentObjectListIndex >= m_pPerfSnapshot->GetNumObjectTypes() )
return 0;
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// Advance to the next PERF_OBJECT_TYPE structure
m_pCurrObjectType = MakePtr(PPERF_OBJECT_TYPE,
m_pCurrObjectType,
m_pCurrObjectType->TotalByteLength );
return new CPerfObject( m_pCurrObjectType, m_pPerfCounterTitles );
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}
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CPerfObject *
CPerfObjectList::GetPerfObject( PCTSTR const pszObjListName )
{
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DWORD objListIdx
= m_pPerfCounterTitles->GetIndexFromTitleString( pszObjListName );
if ( 0 == objListIdx )
return 0;
// Point at first PERF_OBJECT_TYPE, and loop through the list, looking
// for one that matches.
PPERF_OBJECT_TYPE pCurrObjectType =
(PPERF_OBJECT_TYPE)m_pPerfSnapshot->GetPostHeaderPointer();
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for ( unsigned i=0; i < m_pPerfSnapshot->GetNumObjectTypes(); i++ )
{
// Is this the one that matches?
if ( pCurrObjectType->ObjectNameTitleIndex == objListIdx )
return new CPerfObject(pCurrObjectType, m_pPerfCounterTitles);
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// Nope... try the next object type
pCurrObjectType = MakePtr( PPERF_OBJECT_TYPE,
pCurrObjectType,
pCurrObjectType->TotalByteLength );
}
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return 0;
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}