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PdhCalculateCounterFromRawValue function (pdh.h)

  • Article

Calculates the displayable value of two raw counter values.

Syntax

PDH_FUNCTION PdhCalculateCounterFromRawValue(
  [in]  PDH_HCOUNTER          hCounter,
  [in]  DWORD                 dwFormat,
  [in]  PPDH_RAW_COUNTER      rawValue1,
  [in]  PPDH_RAW_COUNTER      rawValue2,
  [out] PPDH_FMT_COUNTERVALUE fmtValue
);

Parameters

[in] hCounter

Handle to the counter to calculate. The function uses information from the counter to determine how to calculate the value. This handle is returned by the PdhAddCounter function.

[in] dwFormat

Determines the data type of the calculated value. Specify one of the following values.

Value Meaning
PDH_FMT_DOUBLE
 Return the calculated value as a double-precision floating point real.
PDH_FMT_LARGE
 Return the calculated value as a 64-bit integer.
PDH_FMT_LONG
 Return the calculated value as a long integer.
 

You can use the bitwise inclusive OR operator (|) to combine the data type with one of the following scaling factors.

Value Meaning
PDH_FMT_NOSCALE
 Do not apply the counter's scaling factor in the calculation.
PDH_FMT_NOCAP100
 Counter values greater than 100 (for example, counter values measuring the processor load on multiprocessor computers) will not be reset to 100. The default behavior is that counter values are capped at a value of 100.
PDH_FMT_1000
 Multiply the final value by 1,000.

[in] rawValue1

Raw counter value used to compute the displayable counter value. For details, see the PDH_RAW_COUNTER structure.

[in] rawValue2

Raw counter value used to compute the displayable counter value. For details, see PDH_RAW_COUNTER. Some counters (for example, rate counters) require two raw values to calculate a displayable value. If the counter type does not require a second value, set this parameter to NULL. This value must be the older of the two raw values.

[out] fmtValue

A PDH_FMT_COUNTERVALUE structure that receives the calculated counter value.

Return value

If the function succeeds, it returns ERROR_SUCCESS.

If the function fails, the return value is a system error code or a PDH error code. The following are possible values.

Return code Description
PDH_INVALID_ARGUMENT
 An argument is not correct or is incorrectly formatted.
PDH_INVALID_HANDLE
 The counter handle is not valid.

Remarks

To retrieve the current raw counter value from the query, call the PdhGetRawCounterValue function.

Requirements

Requirement Value
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header pdh.h
Library Pdh.lib
DLL Pdh.dll

See also

PDH_FMT_COUNTERVALUE

PDH_RAW_COUNTER

PdhGetFormattedCounterValue

PdhGetRawCounterValue

PdhSetCounterScaleFactor