Are you just trying to access the DESC part of a C3D point?
If so, try this:
Code:
; standard entity selection
(setq sel (entsel "\nSelect Point: "))
; get the entity name
(setq ent (car sel))
; get the entity list
(setq lst (entget ent))
; check to make sure the selection was the expected type
(if (eq "AECC_COGO_POINT" (cdr (assoc 0 lst)))
; if so, convert the entity into a VLA-OBJECT
(setq obj (vlax-ename->vla-object ent))
)
(if obj
; get the description of the point
(setq nam (vlax-get-property obj 'Description))
)