Expression to check if current viewport is locked

[ArchD]

I'm looking for a method to check if the current viewport is locked or unlocked, returning T or nil.

I find many methods that are similar to the one below, but gives me an error: 

; error: Automation Error. No active viewport in paperspace

(vl-load-com)
(setq is_vp_lock (vla-get-displaylocked (vla-get-activeviewport (vla-get-activedocument (vlax-get-acad-object)))))

Thanks for any help.

[Shneuph]

I'd have to look at it more... but I think the code is accessing the wrong type of viewport?

[Shneuph]

(vla-get-displaylocked (VLA-GET-activePviewport (vla-get-activedocument (vlax-get-acad-object))))

[Kent1Cooper · Accepted solution]

This has come up before.

[ArchD]

Wow, I've looked at so many of these posts and they all seemed to give me this error. Unfortunately this post never came up in my searches, but is exactly what I needed. Thanks for the link!

[ArchD]

Where did you find that chart? I'd love to look at that in full.

[Shneuph]

It used to be really easy to find in the help menu.  Along with all other developer info.  I found one here:

https://knowledge.autodesk.com/search-result/caas/CloudHelp/cloudhelp/2016/ENU/AutoCAD-ActiveX/files...

[Shneuph]

Windows+R then paste the path:

%ProgramFiles%\Common Files\Autodesk Shared

acadauto.chm  is the help file you want.

I'm making a shortcut to it for myself to use right now.