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96 lines
2.9 KiB
C++
96 lines
2.9 KiB
C++
//====================================
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// File: PERFOBJ.CPP
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// Author: Matt Pietrek
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// From: Microsoft Systems Journal
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// "Under the Hood", APRIL 1996
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//====================================
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#include <windows.h>
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#include <winperf.h>
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#include <stdlib.h>
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#pragma hdrstop
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#include "titledb.h"
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#include "perfobj.h"
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#include "objinst.h"
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#include "makeptr.h"
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CPerfObject::CPerfObject( PPERF_OBJECT_TYPE const pObjectList,
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CPerfTitleDatabase * const pPerfCounterTitles)
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{
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m_pObjectList = pObjectList;
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m_pPerfCounterTitles = pPerfCounterTitles;
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}
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CPerfObjectInstance *
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CPerfObject::GetFirstObjectInstance( void )
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{
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m_currentObjectInstance = 0;
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if ( m_currentObjectInstance >= GetObjectInstanceCount() )
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return 0;
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// Point at the first PERF_INSTANCE_DEFINITION
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m_pCurrentObjectInstanceDefinition =
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MakePtr( PPERF_INSTANCE_DEFINITION, m_pObjectList,
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m_pObjectList->DefinitionLength );
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return new CPerfObjectInstance(
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m_pCurrentObjectInstanceDefinition,
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MakePtr(PPERF_COUNTER_DEFINITION,
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m_pObjectList, m_pObjectList->HeaderLength),
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m_pObjectList->NumCounters,
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m_pPerfCounterTitles,
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m_pObjectList->NumInstances ==
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PERF_NO_INSTANCES ? TRUE : FALSE );
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}
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CPerfObjectInstance *
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CPerfObject::GetNextObjectInstance( void )
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{
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if ( m_pObjectList->NumInstances == PERF_NO_INSTANCES )
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return 0;
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if ( ++m_currentObjectInstance >= GetObjectInstanceCount() )
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return 0;
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// Advance to the next PERF_INSTANCE_DEFINITION in the list. However,
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// following the current PERF_INSTANCE_DEFINITION is the counter data,
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// which is also of variable length. So, we gotta take that into
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// account when finding the next PERF_INSTANCE_DEFINITION
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// First, get a pointer to the counter data size field
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PDWORD pCounterDataSize
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= MakePtr(PDWORD, m_pCurrentObjectInstanceDefinition,
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m_pCurrentObjectInstanceDefinition->ByteLength);
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// Now we can point at the next PPERF_INSTANCE_DEFINITION
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m_pCurrentObjectInstanceDefinition = MakePtr(PPERF_INSTANCE_DEFINITION,
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m_pCurrentObjectInstanceDefinition,
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m_pCurrentObjectInstanceDefinition->ByteLength
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+ *pCounterDataSize);
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// Create a CPerfObjectInstance based around the PPERF_INSTANCE_DEFINITION
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return new CPerfObjectInstance(m_pCurrentObjectInstanceDefinition,
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MakePtr(PPERF_COUNTER_DEFINITION,
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m_pObjectList,
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m_pObjectList->HeaderLength),
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m_pObjectList->NumCounters,
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m_pPerfCounterTitles,
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FALSE );
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}
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BOOL
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CPerfObject::GetObjectTypeName( PTSTR pszObjTypeName, DWORD nSize )
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{
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PTSTR pszName = m_pPerfCounterTitles->GetTitleStringFromIndex(
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m_pObjectList->ObjectNameTitleIndex );
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if ( !pszName )
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return FALSE;
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lstrcpyn( pszObjTypeName, pszName, nSize );
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return TRUE;
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} |