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https://github.com/chibicitiberiu/rainmeter-studio.git
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137 lines
3.9 KiB
C++
137 lines
3.9 KiB
C++
//====================================
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// File: OBJINST.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 "objinst.h"
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#include "perfcntr.h"
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#include "makeptr.h"
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CPerfObjectInstance::CPerfObjectInstance(
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PPERF_INSTANCE_DEFINITION const pPerfInstDef,
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PPERF_COUNTER_DEFINITION const pPerfCntrDef,
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DWORD nCounters, CPerfTitleDatabase * const pPerfCounterTitles,
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BOOL fDummy)
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{
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m_pPerfInstDef = pPerfInstDef;
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m_pPerfCntrDef = pPerfCntrDef;
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m_nCounters = nCounters;
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m_pPerfCounterTitles = pPerfCounterTitles;
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m_fDummy = fDummy;
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}
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BOOL
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CPerfObjectInstance::GetObjectInstanceName(
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PTSTR pszObjInstName, DWORD nSize )
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{
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if ( m_fDummy )
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{
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*pszObjInstName = 0; // Return an empty string
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return FALSE;
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}
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if ( nSize < (m_pPerfInstDef->NameLength / sizeof(TCHAR)) )
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return FALSE;
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PWSTR pszName = MakePtr(PWSTR, m_pPerfInstDef, m_pPerfInstDef->NameOffset);
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#ifdef UNICODE
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lstrcpy( pszObjInstName, pszName );
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#else
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wcstombs( pszObjInstName, pszName, nSize );
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#endif
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return TRUE;
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}
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CPerfCounter *
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CPerfObjectInstance::MakeCounter( PPERF_COUNTER_DEFINITION const pCounterDef )
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{
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// Look up the name of this counter in the title database
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PTSTR pszName = m_pPerfCounterTitles->GetTitleStringFromIndex(
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pCounterDef->CounterNameTitleIndex );
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DWORD nInstanceDefSize = m_fDummy ? 0 : m_pPerfInstDef->ByteLength;
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// Create a new CPerfCounter. The caller is responsible for deleting it.
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return new CPerfCounter(pszName,
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pCounterDef->CounterType,
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MakePtr( PBYTE, m_pPerfInstDef,
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nInstanceDefSize +
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pCounterDef->CounterOffset ),
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pCounterDef->CounterSize );
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}
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CPerfCounter *
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CPerfObjectInstance::GetCounterByIndex( DWORD index )
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{
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PPERF_COUNTER_DEFINITION pCurrentCounter;
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if ( index >= m_nCounters )
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return 0;
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pCurrentCounter = m_pPerfCntrDef;
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// Find the correct PERF_COUNTER_DEFINITION by looping
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for ( DWORD i = 0; i < index; i++ )
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{
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pCurrentCounter = MakePtr( PPERF_COUNTER_DEFINITION,
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pCurrentCounter,
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pCurrentCounter->ByteLength );
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}
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if ( pCurrentCounter->ByteLength == 0 )
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return 0;
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return MakeCounter( pCurrentCounter );
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}
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CPerfCounter *
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CPerfObjectInstance::GetFirstCounter( void )
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{
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m_currentCounter = 0;
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return GetCounterByIndex( m_currentCounter );
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}
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CPerfCounter *
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CPerfObjectInstance::GetNextCounter( void )
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{
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m_currentCounter++;
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return GetCounterByIndex( m_currentCounter );
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}
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CPerfCounter *
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CPerfObjectInstance::GetCounterByName( PCTSTR const pszName )
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{
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DWORD cntrIdx = m_pPerfCounterTitles->GetIndexFromTitleString(pszName);
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if ( cntrIdx == 0 )
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return 0;
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PPERF_COUNTER_DEFINITION pCurrentCounter = m_pPerfCntrDef;
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// Find the correct PERF_COUNTER_DEFINITION by looping and comparing
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for ( DWORD i = 0; i < m_nCounters; i++ )
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{
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if ( pCurrentCounter->CounterNameTitleIndex == cntrIdx )
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return MakeCounter( pCurrentCounter );
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// Nope. Not this one. Advance to the next counter
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pCurrentCounter = MakePtr( PPERF_COUNTER_DEFINITION,
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pCurrentCounter,
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pCurrentCounter->ByteLength );
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}
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return 0;
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} |