147 lines
3.1 KiB
C
147 lines
3.1 KiB
C
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/******************************************************************************
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I N S T A N C E D A T A
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Name: instdata.c
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Description:
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This module contains functions that access instances of an object
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type in performance data.
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Functions:
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FirstInstance
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NextInstance
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FindInstanceN
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FindInstanceParent
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InstanceName
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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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// FirstInstance
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//
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// Returns pointer to the first instance of pObject type.
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// If pObject is NULL then NULL is returned.
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//
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PPERF_INSTANCE FirstInstance (PPERF_OBJECT pObject)
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{
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if (pObject)
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return (PPERF_INSTANCE)((PCHAR) pObject + pObject->DefinitionLength);
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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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// NextInstance
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//
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// Returns pointer to the next instance following pInst.
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//
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// If pInst is the last instance, bogus data maybe returned.
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// The caller should do the checking.
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//
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// If pInst is NULL, then NULL is returned.
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//
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PPERF_INSTANCE NextInstance (PPERF_INSTANCE pInst)
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{
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PERF_COUNTER_BLOCK *pCounterBlock;
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if (pInst)
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{
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pCounterBlock = (PERF_COUNTER_BLOCK *)((PCHAR) pInst + pInst->ByteLength);
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return (PPERF_INSTANCE)((PCHAR) pCounterBlock + pCounterBlock->ByteLength);
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}
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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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// FindInstanceN
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//
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// Returns the Nth instance of pObject type. If not found, NULL is
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// returned. 0 <= N <= NumInstances.
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//
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PPERF_INSTANCE FindInstanceN (PPERF_OBJECT pObject, DWORD N)
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{
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PPERF_INSTANCE pInst;
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DWORD i = 0;
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if (!pObject)
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return NULL;
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else if (N >= (DWORD)(pObject->NumInstances))
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return NULL;
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else
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{
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pInst = FirstInstance (pObject);
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while (i != N)
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{
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pInst = NextInstance (pInst);
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i++;
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}
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return pInst;
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}
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}
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//*********************************************************************
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//
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// FindInstanceParent
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//
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// Returns the pointer to an instance that is the parent of pInst.
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//
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// If pInst is NULL or the parent object is not found then NULL is
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// returned.
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//
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PPERF_INSTANCE FindInstanceParent (PPERF_INSTANCE pInst, PPERF_DATA pData)
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{
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PPERF_OBJECT pObject;
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if (!pInst)
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return NULL;
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else if (!(pObject = FindObject (pData, pInst->ParentObjectTitleIndex)))
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return NULL;
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else
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return FindInstanceN (pObject, pInst->ParentObjectInstance);
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}
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//*********************************************************************
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//
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// InstanceName
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//
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// Returns the name of the pInst.
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//
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// If pInst is NULL then NULL is returned.
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//
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LPTSTR InstanceName (PPERF_INSTANCE pInst)
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{
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if (pInst)
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return (LPTSTR) ((PCHAR) pInst + pInst->NameOffset);
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else
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return NULL;
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}
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