The PdhCollectQueryData function collects the current raw data value for all counters in the specified query and updates the status code of each counter.
PDH_STATUS PdhCollectQueryData(
IN HQUERY hQuery // handle of the query
);
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:
| Value | Meaning |
|---|---|
| PDH_INVALID_HANDLE | The query handle is not valid. |
| PDH_NO_DATA | The query does not currently have any counters. |
The PdhCollectQueryData function can succeed, but may not have collected data for all counters. Always check the status code of each counter in the query before using the data.
Performance Data Helper Overview, Performance Data Functions, , PdhOpenQuery