EFW suggested call sequence missing a step?

gekart

According to the EFW SDK V1.7 documentation, the following is the sequence of calls:

Get count of connected filter wheels--> EFWGetNum
Get filter wheels' ID-> EFWGetID
Get filter wheels' name--> EFWGetProperty
Open filter wheel --> EFWOpen(Notes: this SDK can operate multiple filter wheels，distinguish by each filter wheel's ID)
Rotate--> EFWSetPosition
Close filter wheel-->EFWClose

However, if I do not call EFWGetProperty once after EFWOpen (on MacOS), then EFWSetPosition is giving me EFW_ERROR_GENERAL_ERROR. If I call EFWGetProperty after EFWOpen everything works as expected. Either a bug or a docs blunder?

Grischa

Software@ZWO

gekart Hi Grischa, EFWGetProperty must be called after EFWOpen is called. Then call EFWSetPosition. We will modify the help document immediately. Thank you for your feedback.

gekart

Excellent. Maybe also want to note, that after EFWGetID and before EFWOpen, the EFWGetProperty call responds with EFW_ERROR_CLOSED. That call is technically not really necessary, but you would want to call it to know which EFW you are opening.

Software@ZWO

gekart It's very kind of you. Thank you.