Checks whether a transfer is still running.
|Handle||The CURL session handle.||$curl|
Returns 1 if transfer is running or 0 if not.
DescriptionChecks whether a transfer is still running.
This is useful if you started transfer with CURL.PerformInBackground and you want to know whether it has finished yet or not.
When perform is done in background, use CURL.ErrorCode and CURL.ErrorMessage to query result status.
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