rainmeter-studio/Plugins/PluginPerfMon/ObjList.cpp
2011-01-27 19:24:09 +00:00

83 lines
2.5 KiB
C++

//====================================
// 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(
CPerfSnapshot * const pPerfSnapshot,
CPerfTitleDatabase * const pPerfTitleDatabase )
{
m_pPerfSnapshot = pPerfSnapshot;
m_pPerfCounterTitles = pPerfTitleDatabase;
}
CPerfObject *
CPerfObjectList::GetFirstPerfObject( void )
{
m_currentObjectListIndex = 0;
if ( m_currentObjectListIndex >= m_pPerfSnapshot->GetNumObjectTypes() )
return 0;
m_pCurrObjectType =
(PPERF_OBJECT_TYPE)m_pPerfSnapshot->GetPostHeaderPointer();
return new CPerfObject( m_pCurrObjectType, m_pPerfCounterTitles );
}
CPerfObject *
CPerfObjectList::GetNextPerfObject( void )
{
// Are we at the last object in the list? Return NULL if so.
if ( ++m_currentObjectListIndex >= m_pPerfSnapshot->GetNumObjectTypes() )
return 0;
// 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 );
}
CPerfObject *
CPerfObjectList::GetPerfObject( PCTSTR const pszObjListName )
{
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();
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);
// Nope... try the next object type
pCurrObjectType = MakePtr( PPERF_OBJECT_TYPE,
pCurrObjectType,
pCurrObjectType->TotalByteLength );
}
return 0;
}