Two questions that have not been asked often, maybe...

[harrison-matt]

All,

 

I am inquiring about how to add the ' apostrophe function to my programs.

And how to have your ssget recognize objects selected prior to command start.

 

Any thoughts?

 

Kind Regards,

 

Matt

[Ahankhah]

how to have your ssget recognize objects selected prior to command start.

 

(setvar 'Pickfirst 1)(ssget "_I" )

[Ahankhah]

I am inquiring about how to add the ' apostrophe function to my programs.

Can you explain more clearly about your aim?

[alanjt]

By apostrophe, I'm assuming you mean running the command transparently.

If so, any LISP routine can be executed transparently IF and on IF it does NOT have any command calls.

 

eg.

(defun c:L0 (/ ss i)
 (if (setq ss (ssget "_:L"))
   (repeat (setq i (sslength ss))
     (entmod (list '(8 . "0") (cons -1 (ssname ss (setq i (1- i))))))
   )
 )
 (princ)
)

 

If you notice, this can be executed transparently by typing 'L0 at any time AND if objects are selected before the routine is executed, it will process said objects, thus suppressing the prompt to select objects.

[Lee Mac]

ssget will detect an existing selection, regardless of whether the Implied "_I" mode string is used.

 

As for the apostrophe, I'm unsure as to whether you are referring to marking expressions as literals or running a function transparently within a command. If it is the former, read this:

http://www.cadtutor.net/forum/showpost.php?p=258390&postcount=20

 

Lee

[harrison-matt]

ssget will detect an existing selection, regardless of whether the Implied "_I" mode string is used.

 

I use ssget in the majority of my commands and if i have a selection set prior to launching the command it does not recognize the set.

 

Matt

[alanjt]

Do you have a command call before the ssget call? Also, check our pickfirst variable.

Edited April 30, 2011 by alanjt

[Ahankhah]

ssget will detect an existing selection, regardless of whether the Implied "_I" mode string is used.]

 

Lee

 

You are right Lee, just to add some necessry explanations:

1- If Pickfirst system variable is set to 1, (ssget) detects existing selection.

2- If Pickfirst is set to 0, (ssget) prompts user to select desired objects.

 

So what is the task of "_I"? I think NOTHING.

[Lee Mac]

So what is the task of "_I"? I think NOTHING.

 

Perhaps for when PICKFIRST is set to 0... I wouldn't know, I always have it set to 1.

[Ahankhah]

Perhaps for when PICKFIRST is set to 0... I wouldn't know, I always have it set to 1.

 

I tested that. It returnes a value and doesn't wait for user input or selection. This is the differnce of (ssget "_I") with (ssget).

 

Pickfirst=0, a selection set exists: (ssget "_I") returns nil

Pickfirst=1, no selection set exists: (ssget "_I") returns nil

Pickfirst=1, a selection set exists: (ssget "_I") returns

Pickfirst=1, no selection set exists: (ssget "_I") returns nil