Topic: Are entity names permanent ?

[mailmaverick]

Are entity names given by (car (entsel)) or  (ssname ss (setq n (1- n))) permanent in a drawing ?

By permanent I mean that the entity names are same for a particular entity (line / polyline / circle / ellipse etc)  even if we open a drawing after few days in a different computer ?

If not, then what else is permanent for an entity ?

[Kerry]

RTFM
http://help.autodesk.com/view/ACD/2015/ENU/?guid=GUID-9CB07C25-4439-445D-B1B3-92174C53C571

Entity names assigned to objects in a drawing are only in effect during the current editing session. The next time you open the drawing, AutoCAD assigns new entity names to the objects. You can use an object's handle to refer to it from one editing session to another.

[irneb]

RTFM

Damn! I was expecting a "standard" No! answer ... but this takes the cake!

Hint to the OP: Look for something regarding Handles.

[snownut2]

RTFM
http://help.autodesk.com/view/ACD/2015/ENU/?guid=GUID-9CB07C25-4439-445D-B1B3-92174C53C571

Entity names assigned to objects in a drawing are only in effect during the current editing session. The next time you open the drawing, AutoCAD assigns new entity names to the objects. You can use an object's handle to refer to it from one editing session to another.

RTFM = Read The F&^%#$% Memo ?

[Kerry]

Sort of

http://en.wikipedia.org/wiki/RTFM

[MP]

lol, kid gloves and sledge hammers, we haz variety folks

[mailmaverick]

So it means  (cdr (assoc 5 (entget ent)))) for every entity is permanent throughout the lifespan of the entity ?

[Kerry]

No. Read the Help quote I posted.

Yes, If the ent in manually selected in the session.

[mailmaverick]

Dear Kerry,

(cdr (assoc 5 (entget ent)))) returns the handle for the entity. See following link :-

http://www.autodesk.com/techpubs/autocad/acadr14/dxf/common_group_codes_for_graphical_objects_al_u05_c.htm

It is mentioned that Group Code 5 returns the entity handle.

As per the Help quote provided by you :-
Entity names assigned to objects in a drawing are only in effect during the current editing session. The next time you open the drawing, AutoCAD assigns new entity names to the objects. You can use an object's handle to refer to it from one editing session to another.


It means that handles are permanent. Then, why (cdr (assoc 5 (entget ent)))) will not be permanent ?

[Kerry]

If you want to convert a handle to entityName look at handent (AutoLISP)

http://help.autodesk.com/view/ACD/2015/ENU/?guid=GUID-AF6DD533-1A24-4687-96EB-F03F26050C07

This is one way to obtain and re-use the data

Code - Auto/Visual Lisp: [Select]

1.  
2. (setq ent (car ( entsel)))                           ; <Entity name: 7ffffb05b60>
3. (setq handleString (cdr (assoc 5 (entget ent))))     ; "3D6"
4.  
5.  
6. ;; --> Save the handleString
7.  
8. ;; --> restore the handleString
9.  
10. (setq ent (handent handleString))                    ; <Entity name: 7ffffb05b60>

[mailmaverick]

OK Thanks

This is also a good link :

http://help.autodesk.com/view/ACD/2015/ENU/?guid=GUID-F0AE18DE-4E8F-48C6-8138-0AF7ECE14C49

[Kerry]

OK Thanks

This is also a good link :

http://help.autodesk.com/view/ACD/2015/ENU/?guid=GUID-F0AE18DE-4E8F-48C6-8138-0AF7ECE14C49

Good, You're learning how to use help.
My work is done.