Set value to variable, VL ...

[carlos_m_gil_p]

Hello boys how are you.

I am trying to set a variable with VL functions, but it gives me an error.

; error: Automation Error. Error setting system variable

Why does this happen and how can I correct it?

(setq doc (vla-get-activedocument (vlax-get-acad-object)))
(vlax-variant-value (vla-GetVariable doc "3dosmode"))
(vla-SetVariable doc "3dosmode" 3)

Thanks a lot.

[john.uhden]

Why struggle unnecessarily?  Just use getvar and setvar.

[hak_vz · Accepted solution]

If you strictly use visual lisp than  use this.

Visual lisp functions need to be feed with adequate data type i.e. variants. Google or lookup in help vlax-make-variant

(setq doc (vla-get-activedocument (vlax-get-acad-object)))
(setq old_3dosmode (vlax-variant-value (vla-GetVariable doc "3dosmode")))
(setq new_val (vlax-make-variant 3 vlax-vbInteger))

(vla-SetVariable doc "3dosmode" new_val)

Or simply

(setvar '3dosmode 3)

[carlos_m_gil_p]

Hi thanks.

I will be more pending.
I will always forecast the data to avoid errors.

[carlos_m_gil_p]

Hi @john.uhden , I'm just trying to get a better understanding of these functions and how they work.

[john.uhden]

Learning is a great thing.  Attaboy!