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NF:pdh.PdhOpenQueryA |
PdhOpenQueryA function (pdh.h) |
Creates a new query that is used to manage the collection of performance data. To use handles to data sources, use the PdhOpenQueryH function. (ANSI) |
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perf\pdhopenquery.htm |
perf |
ec4e5353-c7f5-4957-b7f4-39df508846a0 |
12/05/2018 |
PdhOpenQuery, PdhOpenQuery function [Perf], PdhOpenQueryA, PdhOpenQueryW, _win32_pdhopenquery, base.pdhopenquery, pdh/PdhOpenQuery, pdh/PdhOpenQueryA, pdh/PdhOpenQueryW, perf.pdhopenquery |
pdh.h |
Windows |
Windows XP [desktop apps only] |
Windows Server 2003 [desktop apps only] |
PdhOpenQueryW (Unicode) and PdhOpenQueryA (ANSI) |
Pdh.lib |
Pdh.dll |
Windows |
19H1 |
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Creates a new query that is used to manage the collection of performance data.
To use handles to data sources, use the PdhOpenQueryH function.
Null-terminated string that specifies the name of the log file from which to retrieve performance data. If NULL, performance data is collected from a real-time data source.
User-defined value to associate with this query. To retrieve the user data later, call PdhGetCounterInfo and access the dwQueryUserData member of PDH_COUNTER_INFO.
Handle to the query. You use this handle in subsequent calls.
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.
PdhSetDefaultRealTimeDataSource
Note
The pdh.h header defines PdhOpenQuery 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.