Updates the value of a counter whose value is a pointer to the actual data. Providers use this function.

Syntax

ULONG PerfSetCounterRefValue(
  __in  HANDLE hProvider,
  __in  PPERF_COUNTERSET_INSTANCE pInstance,
  __in  ULONG CounterId,
  __in  PVOID lpAddr
);

Parameters

hProvider [in]

Handle to the provider that created the instance. The handle is returned by PerfStartProvider.

pInstance [in]

A PERF_COUNTERSET_INSTANCE structure that contains the counter set instance. The PerfCreateInstance function returns this pointer.

CounterId [in]

Identifier that uniquely identifies the counter to update in the instance block. The identifier is defined in the id attribute of the <counter> element and must match the CounterId member of one of the PERF_COUNTER_INFO structures in the instance block.

lpAddr [in]

Pointer to the actual counter data.

If NULL, the consumer receives ERROR_NO_DATA.

To indicate that the counter data is accessed by reference, the counter declaration in the manifest must include a <counterAttribute> element whose name attribute is set to "reference".

Return Value

If the function succeeds, it returns ERROR_SUCCESS.

If the function fails, the return value is a system error code.

Remarks

This is a convenience function for specifying a reference to the raw counter data. To update the reference to the raw counter data yourself, use the Offset member of the PERF_COUNTER_INFO structure to access the counter value for a specific counter. The Attrib member must include the PERF_ATTRIB_BY_REFERENCE flag. The PERF_COUNTERSET_INSTANCE structure block contains one or more counter information structures.

Depending on the counter type, the pointer must reference a 4-byte or 8-byte unsigned integer. When collecting the counter data, PERFLIB dereferences the pointer and returns the actual data.

Requirements

See Also

PerfSetULongLongCounterValue
PerfSetULongCounterValue

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Build date: 9/19/2008