Retrieves the Id of the process (PID) that initiated the operation.
This method can be called within the FilePasswordNeeded event to retrieve the Id of the process (PID) that initiated the operation. If the query fails, this method returns 0.
Please note that PIDs are not unique, and may be reused by different processes over time (though in practice, this is uncommon).
CBDrive/Windows-specific: Applications cannot use this method to retrieve information about remote processes accessing virtual drives shared on the network. Windows does not provide such information due to the nature of remote access.
This method returns an Integer value; after it returns, call the GetLastErrorCode() method to obtain its result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message.