120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
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/******************************************************************************
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C O U N T E R D A T A
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Name: cntrdata.c
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Description:
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This module contains functions that access counters of an instance
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of object in performance data.
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Functions:
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FirstCounter
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NextCounter
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FindCounter
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CounterData
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******************************************************************************/
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#include <windows.h>
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#include <winperf.h>
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#include "perfdata.h"
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//*********************************************************************
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//
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// FirstCounter
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//
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// Find the first counter in pObject.
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//
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// Returns a pointer to the first counter. If pObject is NULL
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// then NULL is returned.
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//
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PPERF_COUNTER FirstCounter (PPERF_OBJECT pObject)
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{
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if (pObject)
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return (PPERF_COUNTER)((PCHAR) pObject + pObject->HeaderLength);
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else
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return NULL;
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}
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//*********************************************************************
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//
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// NextCounter
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//
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// Find the next counter of pCounter.
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//
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// If pCounter is the last counter of an object type, bogus data
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// maybe returned. The caller should do the checking.
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//
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// Returns a pointer to a counter. If pCounter is NULL then
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// NULL is returned.
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//
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PPERF_COUNTER NextCounter (PPERF_COUNTER pCounter)
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{
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if (pCounter)
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return (PPERF_COUNTER)((PCHAR) pCounter + pCounter->ByteLength);
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else
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return NULL;
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}
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//*********************************************************************
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//
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// FindCounter
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//
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// Find a counter specified by TitleIndex.
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//
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// Returns a pointer to the counter. If counter is not found
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// then NULL is returned.
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//
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PPERF_COUNTER FindCounter (PPERF_OBJECT pObject, DWORD TitleIndex)
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{
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PPERF_COUNTER pCounter;
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DWORD i = 0;
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if (pCounter = FirstCounter (pObject))
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while (i < pObject->NumCounters)
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{
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if (pCounter->CounterNameTitleIndex == TitleIndex)
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return pCounter;
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pCounter = NextCounter (pCounter);
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i++;
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}
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return NULL;
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}
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//*********************************************************************
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//
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// CounterData
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//
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// Returns counter data for an object instance. If pInst or pCount
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// is NULL then NULL is returne.
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//
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PVOID CounterData (PPERF_INSTANCE pInst, PPERF_COUNTER pCount)
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{
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PPERF_COUNTER_BLOCK pCounterBlock;
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if (pCount && pInst)
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{
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pCounterBlock = (PPERF_COUNTER_BLOCK)((PCHAR)pInst + pInst->ByteLength);
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return (PVOID)((PCHAR)pCounterBlock + pCount->CounterOffset);
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}
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else
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return NULL;
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}
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