11.5 - Unsupported Functions (Applies to UD-Series) | LabJack
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11.5 - Unsupported Functions (Applies to UD-Series)

The LJ_ioSET_STREAM_CALLBACK, LJ_ioSET_EVENT_CALLBACK and any other LabJack function that requires a function pointer are not supported. These particular two callback's are handled internally by DAQFactory. The first allows DAQFactory to process streaming data, while the second handles connect and disconnect messages from the driver.

Also, you should not change the LJ_chSTREAM_WAIT_MODE, as all waiting is handled internally. If you change this, you will most likely cause streaming to stop functioning.