Topic: List Question

[V-Man]

Is there a maximum number of characters that can be in a list?

[SMadsen]

Of characters? Do you mean maximum number of items in a list or maximum number of characters in a string?

To either: no maximum ('cept for memory limitations)

[V-Man]

Of characters? Do you mean maximum number of items in a list or maximum number of characters in a string?

Yes, Sorry I mean items.

[Keith™]

never tried, but there is a 1024 character limit on certain strings

[Jeff_M]

FWIW, here is the string length of an Mtext object in one of my drawings. I have no problem setting/retrieving a variable assigned to the string.

Command: (strlen (vla-get-textstring (vlax-ename->vla-object (car (entsel)))))
Select object: 7987

Jeff

[SMadsen]

Just did a test with this:

Code: [Select]

(defun strLenTest (/ astr)
  (defun makeFirstString (/ str a)
    (setq a 65 str "")
    (repeat 1024
      (setq str (strcat str (chr a))
            a   (cond ((<= a 122) (1+ a))(65)))
    )
    str
  )
  (setq astr (makeFirstString))
  (while (not (vl-catch-all-error-p astr))
    (setq astr (vl-catch-all-apply 'strcat (list astr astr)))
    (princ (strlen astr))(terpri)
  )
)

It got to make a string with 268,435,456 characters and then ran into an access violation when trying to concatenate two times 268,435,456 characters.

[Mark]

this is what I get;

Code: [Select]


Command: (strlentest)
2048
4096
8192
16384
32768
65536
131072
262144
524288
1048576
2097152
4194304
8388608
16777216
33554432
67108864
134217728
; error: ; error:


[SMadsen]

Probably depends on available heap space. But 134,217,728 is a pretty long string, too

[V-Man]

Same here..

Code: [Select]


Command: (STRLENTEST)
2048
4096
8192
16384
32768
65536
131072
262144
524288
1048576
2097152
4194304
8388608
16777216
33554432
67108864
134217728
268435456
; error: ; error:


[Keith™]

Perhaps I should have made myself a little clearer ... try to put a string in a lisp file that is greater than 1024 characters...you can strcat them together till you run out of heap space, but the string itself must be below that length.... I had that problem in some programs I had written and had to put the items in dofferent variables first, then strcat them together in the program.

[SMadsen]

Perhaps I should have made myself a little clearer ...

Oh, the test was not to prove you wrong or anything .. it was simply pure curiosity.

I know there are limitations on string input and strings in entity data and such. Personally, I've not experienced a limitation on strings in lisp files - probably because I never stuffed a 1024+ character string anywhere. Are you referring to limitations for I/O functions?