How to pass Entity name to defun

[topogigio]

Hello.

 

I'm new here and i'm a basic hobbist programmer in autolisp.

 

My problem Is this error:

 

Error: wrong (bad) function: < Entity name: ....>

 

This is my test code (simplified) , that would be modified to greater selection (ssget "_x" (list (0 .  "*Polyline ) (8 . "1"))

and a while loop that calls the function, where there are some if and while cycles ( a lisp that i created and works on a single Entity)

 

(setq selezione (ssget ":s")

(setq a (ssname selezione 0)


(defun estraz_vertici (elem)

(setq param ( entget elem))

(print param)

)


(Estraz_vertici (a))

 

I read that entity name Is a pointer (i have no advaced knowledge in programming) and i don't know how to work with It in this case.

 

Thank you in Advance 

Edited June 19 by SLW210
Added Code Tags!!

[SLW210]

Please use Code Tags for your Code not Quote Tags. (<> in the editor toolbar)

[Steven P]

In LISP anything enclosed in () is a function

 

(Estraz_vertici (a)) means pass the result of function 'a' to function 'Estraz_vertici' - outside brackets to be a variable

 

I think you want

 

(Estraz_vertici a)

 

[topogigio]

On 6/19/2025 at 11:24 PM, SLW210 said:

Please use Code Tags for your Code not Quote Tags. (<> in the editor toolbar)

Thank you.

 

I Will do this next time. I didn't know that.

 

On 6/19/2025 at 11:46 PM, Steven P said:

In LISP anything enclosed in () is a function

 

(Estraz_vertici (a)) means pass the result of function 'a' to function 'Estraz_vertici' - outside brackets to be a variable

 

I think you want

 

(Estraz_vertici a)

 

 

Thank you

 

I tryed and  i have same error.

[Steven P]

Looking at this again, missed this first time around, your brackets need to be in pairs an opening ( and a closing )

 

Your first 2 lines, the setq lines.

 

Something like this:

 

(defun c:test ( / selezione a )
  (setq selezione (ssget ":s"))
  (setq a (ssname selezione 0))

  (defun estraz_vertici (elem / )
    (setq param ( entget elem))
    (print param)
  ) ; end defun
  (Estraz_vertici a)

  (princ)
) ; end function

 

[topogigio]

Thank you, again.

 

I Will put attention on It when i return to home.

[topogigio]

Hello.

On 6/19/2025 at 11:46 PM, Steven P said:

In LISP anything enclosed in () is a function

 

(Estraz_vertici (a)) means pass the result of function 'a' to function 'Estraz_vertici' - outside brackets to be a variable

 

I think you want

 

(Estraz_vertici a)

 

 

@Steven P

 

You are/was rigth and my Memory failed, saying that It gave me the same error. 

 

It's correct 

 

(Estraz_vertici a)

 

And works in the while loop that i made.

 

Also thank you for teaching how to pass a defun result to' another and i ask you how to give more same defun results to another one and different defuns sigle result to another One.

 

Thank you again for tour patience and attention

Edited June 25 by topogigio