Error - number of Selection set exceeds

I am using a AutoLISP for our work. Lot of times AutoCAD shows an error message - number of selection set exceeds. We have a lot of selection set defined in the AutoLISP.

Is there any way to overcome this...
Is there any buffer which can be increased...

Please help. thanks.

 

you are limited to a maximum of 128 selection sets in acad. there is now way to increase this.
what you should be doing is releasing the selection set after you have used it, otherwise you are tying up your resources. as you have now found

 

see memory management funcion topic in vlisp help

Nagesh

message - number of selection set exceeds. We have a lot of selection set
defined in the AutoLISP.

 

I guess you are referring to (gc) -- which the help on selection sets
also suggests. Unhappily, it doesn't work in this case. It's not the
amount of memory but the presence of 128 selection sets that sets the
error. Several people have written routines to reset. One worked in
previous versions but will not in 04.

The only option that I know of is to reload the drawing. That can be
best done by saving and going straight to files/load and picking the
same drawing.

There are 2 reasons why the ssets build up: 1)poorly written lisps which
do not release the sset variable. (setq sset nil) during each iteration
of a loop. 2) the tendency of users to <esc> from a routine before it
ends. Really good lisps have an error handler defined to handle this. A
virtue rarely embraced by even the canniest programmer.

rs

 

thnks for clarifying my misunderstanding.

 

but if you declare those ss variables local, they should be gone with an escape??

"TCEBob" <>
|>I guess you are referring to (gc) -- which the help on selection sets
|>also suggests. Unhappily, it doesn't work in this case. It's not the
|>amount of memory but the presence of 128 selection sets that sets the
|>error. Several people have written routines to reset. One worked in
|>previous versions but will not in 04.
|>
|>The only option that I know of is to reload the drawing. That can be
|>best done by saving and going straight to files/load and picking the
|>same drawing.
|>
|>There are 2 reasons why the ssets build up: 1)poorly written lisps which
|>do not release the sset variable. (setq sset nil) during each iteration
|>of a loop. 2) the tendency of users to <esc> from a routine before it
|>ends. Really good lisps have an error handler defined to handle this. A
|>virtue rarely embraced by even the canniest programmer.
|>
|>rs
|>
|>|>> see memory management funcion topic in vlisp help
|>>
|>> Nagesh
|>>
|>> |>> > I am using a AutoLISP for our work. Lot of times AutoCAD shows an
|>error
|>> message - number of selection set exceeds. We have a lot of selection
|>set
|>> defined in the AutoLISP.
|>> >
|>> > Is there any way to overcome this...
|>> > Is there any buffer which can be increased...
|>> >
|>> > Please help. thanks.
|>>
|>>
|>

James Maeding
Civil Engineer/Programmer

 

an escape??

No, the subroutine has to complete before the interpreter releases any
variables.

rs

 

No, the subroutine has to complete before the interpreter releases any

Not so fast, Bob......
Using this little test, and it's brother with ss included as a local
var:

(defun test ()
(setq ss (ssget))
(if ss
(getstring "\nPress escape now....")
)
)

Gives these results:

press ESC when asked:
Command: !ss
<Selection set: 11>

Just hit enter:
Command: !ss
<Selection set: 11>


With ss localized.....
press ESC when asked:
Press escape now....*Cancel*
; error: Function cancelled
Command: !ss
nil

Just hit enter:
Press escape now....
""
Command: !ss
nil

So it seems ACAD does cleanup the local vars, unless I've got an error
handler somewhere that is not the stock ACAD one.....

Jeff

 

Works here. Didn't used to. I missed the memo. Thanks for the info. So
now the prime reason for sset overflow must be careless programming. My
specialty.

rs