[LISP程序]：请问选择集最大限制是多少啊?

小狼

今天做一个裁图的程序,在做选择裁减是出现
error: exceeded maximum number of selection sets
这是为什么啊?
请问选择集最大限制是多少啊?
怎么样能取消限制啊?

aidraft

Re: Where find selection set max
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)
)

--
John Uhden, Cadlantic

oyxx_1023

应该是128个。但是我记得好象那是在ARX中才有这个限制，LISP也是128个的上限吗？

xxxyzxx

感谢楼主提议，又学了一招，原来是128，但我选的超过128也能计算（也许是某大哥将选集优化了）