PdhGetDataSourceTimeRangeA function (pdh.h)
Determines the time range, number of entries and, if applicable, the size of the buffer containing the performance data from the specified input source.
To use handles to data sources, use the PdhGetDataSourceTimeRangeH function.
Syntax
PDH_FUNCTION PdhGetDataSourceTimeRangeA(
[in] LPCSTR szDataSource,
[out] LPDWORD pdwNumEntries,
[out] PPDH_TIME_INFO pInfo,
[in] LPDWORD pdwBufferSize
);
Parameters
[in] szDataSource
Null-terminated string that specifies the name of a log file from which the time range information is retrieved.
[out] pdwNumEntries
Number of structures in the pInfo buffer. This function collects information for only one time range, so the value is typically 1, or zero if an error occurred.
[out] pInfo
A PDH_TIME_INFO structure that receives the time range.
[in] pdwBufferSize
Size of the PDH_TIME_INFO structure, in bytes.
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 |
|---|---|
|
A parameter is not valid or is incorrectly formatted. |
|
The counter handle is not valid. |
|
The current data source is a real-time data source. |
Remarks
Note
The pdh.h header defines PdhGetDataSourceTimeRange as an alias which automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.
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 |