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Performance Data Helper (PDH) types
Consumers that use the Performance Data Helper (PDH) functions use the following types:
| Data type | Description |
|---|---|
| PDH_HQUERY | Handle to a query. The PdhOpenQuery function returns this handle. Close the handle using PdhCloseQuery. |
| PDH_HCOUNTER | Handle to a counter. The PdhAddCounter function returns this handle. Close the handle using PdhRemoveCounter or by closing the handle to the query that contains the counter. Do not call PdhRemoveCounter on a counter if the corresponding query has already been closed. PDH maintains the linkage between counters and queries and will automatically close counter handles when the corresponding query handle is closed. |
| PDH_HLOG | Handle to a log file. The PdhOpenLog and PdhBindInputDataSource functions return this handle. Close the handle using PdhCloseLog. |
| PDH_STATUS | PDH status value. All PDH functions return a value of type PDH_STATUS. If the function succeeds, the return value is ERROR_SUCCESS. Otherwise, the function returns a system error code or a PDH error code. |