PdhCalculateCounterFromRawValue

The PdhCalculateCounterFromRawValue function computes the current value of a counter as referenced by the hCounter parameter, using the raw counter data passed in the parameter list.

PDH_STATUS PdhCalculateCounterFromRawValue(
  HCOUNTER hCounter,           
  DWORD dwFormat,              
  PPDH_RAW_COUNTER rawValue1,  
  PPDH_RAW_COUNTER rawValue2,  
  PPDH_FMT_COUNTERVALUE fmtValue  
);

Parameters

hCounter

[in] A handle to the counter used for the computation. This determines how the data will be computed.

dwFormat

[in] The format code can be 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.

The value selected from the previous table can be combined using the OR operator with one of the following scaling flags.

Flag	Meaning
PDH_FMT_NOSCALE	Do not apply the counter's scaling factors in the calculation.
PDH_FMT_NOCAP100	Counter values above 100 (for example, counter values measuring the processor load on multiprocessor machines) 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 1000.

rawValue1

[in] A pointer to the raw counter value used to compute the counter value. Some counters (for example, rate counters) require two raw values for a calculation. The format of the buffer depends on the type of counter to be processed. See PDH_RAW_COUNTER.

rawValue2

[in] A pointer to the raw counter value used in computations for counters that require two raw values (for example, rate counters). This value must be the older of the two raw values.

fmtValue

[out] A pointer to the PDH_FMT_COUNTERVALUE structure that receives the calculated counter value.

Return Values

If the function succeeds, it returns ERROR_SUCCESS.

If the function fails, the return value is a PDH error status defined in PDHMsg.h. The following are possible error values.

Requirements

  Windows NT/2000: Requires Windows NT 4.0 or later.
  Header: Declared in Pdh.h.
  Library: Use Pdh.lib.

See Also

PDH_FMT_COUNTERVALUE, PDH_RAW_COUNTER, PdhGetFormattedCounterValue, PdhGetRawCounterValue, PdhSetCounterScaleFactor