Lisp method to change userdefinedproperties

[meads]

I am trying to write a lisp that can change the user defined property of a parcel. The property is "Rotation". Here is the bit of code.

  (setq parc (vlax-ename->vla-object (car (entsel "\nSELECT PARCEL" ))))

  (vlax-invoke parc 'GetUserDefinedPropertyValue "Rotation" )

I get this error:  SELECT PARCEL; error: Civil 3D API: Unspecified error

Any help is greatly appreciated.

[Jeff_M · Accepted solution]

The Parcel UDP methods have never worked in lisp (or COM, for that matter). This can be done using the .NET API.

[meads]

Okay thank you for the reply. I will have to try .net.