Where find selection set max

Can you point me where I find " I know that AutoCAD can allow only upto 128
selection sets per time."
thanks for your help.
Best regards
Ade Suharna

 

http://xarch.tu-graz.ac.at/autocad/news/autodesk.autocad.customization/msg00320.html

http://groups.google.com/groups?selm=3feb11fb$1_4@statler

http://groups.google.com/groups?selm=

 

From the AutoCAD 2002 Developer help:
"Attempting to manage a large number of selection sets simultaneously is not
recommended. An AutoLISP application cannot have more than 128 selection sets
open at once. (The limit may be lower on your system.) When the limit is
reached, AutoCAD refuses to create more selection sets. Keep a minimum number of
sets open at a time, and set unneeded selection sets to nil as soon as possible.
If the maximum number of selection sets is reached, you must call the gc
function to free unused memory before another ssget will work."

Using (gc) may still not free up selection sets if each is bound to a unique
variable.

This is basically the same as that posted July 2003 by Jason Piercey <sheesh,
even the function name's the same!>:
(defun C:ClearSS ( / n)
(setq n 0)
(foreach item (atoms-family 0)
(and
(= (type (eval item)) 'PICKSET)
(setq n (1+ n))
(set item nil)
)
)
(gc)
(princ (strcat "\nCleared out " (itoa n) " selection sets."))
(princ)
)

 

Adesu,
When 'done' with a given selection set, it is always a good idea to 'null' it out (nil). e.g.
(setq ss (ssget "X")); get all
.......do something with the ss..
(setq ss nil)

This allows you to do more than the limit.

Bob

 

Hi R.K.McSwain,John Uhden and ECCAD,thanks a lot for your help
I mean in AutoCAD 2000 ,where I find it.

 

I'm not sure what you mean about where to find "it." The documentation for 2002
is the same I think for 2000. The help file is called acad_dev.chm and should be
found in AutoCAD's "Help" subdirectory.

 

I forgot to mention that localizing variables is the simplest and prefered means
of avoiding the selection set overrun as they don't become global...
(defun C:Whatever ( / SS)
(setq SS (ssget <filter>))
;; etcetera
)

Here's a really bad example:
(defun C:ReallyBad ()
(setq Done nil i 0)
(while (not Done)
(set (read (strcat "SS" (itoa i)))(ssget <filter>))
;; whatever
(setq i (1+ i))
)
)

 

Sorry John for you become confuse,I mean I'm not yet find " I know that
AutoCAD can allow only upto 128
selection sets per time." in " AutoCAD 2000 Help "