Retrieving xdat from an entity

[Anonymous]

Hey Gang

How can i build a selection set of all circles  and then retrieve the xdata attached to them?  Thanks.

Southie

[dbroad]

These sequences should give you some hints:

(regapp "myapp")

;Draw a test circle

(setq e (entlast));;Select circle

(entmod (list (cons -1 e) '(-3 ("myapp" (1000 . "this is xdata"))))) ;;add xdata to circle

(cdr (assoc -3 (entget e '("myapp")))) ;;get xdata from circle

(ssget '(0 . "circle"));;filtered selection set for circles.



(setq ss (ssget '((0 . "circle") (-3 ("myapp")))));;To filter for circles managed by "myapp".

[Anonymous]

Thanks for the quick response.  There use to be a Doug Broad who was a guru around here a while back.

Here is my attempt

(setq ss (ssget "x" '((0 . "circle") (-3 ("circ")))));;

(setq index 0)
(repeat (sslength ss)
(setq ent1 (entget (ssname ss index))
      e (cdr (assoc -1 ent1))
      xent (cdr (assoc -3 (entget e '("circ")))))
(setq index (+ index 1))

);repeat

xent = (("CIRC" (1002 . "{") (1000 . "qty 4") (1002 . "}"))) how do i assign   "qty 4"  to a variable. thanks.

[dbroad]

That's me.  

There are ways to get the data but the most productive process is to play with the list functions: car, cdr, their composites: caar cadr cdar cddr, etc.  and assoc.  The person who wrot the app that stores the xdata is responsible for the ordering of the information in the xdata and should know how to extract an individual object.  Some examples for your particular case using X as the variable name are:

_$(setq x '(("CIRC" (1002 . "{") (1000 . "qty 4") (1002 . "}"))))

_$ (car x)
("CIRC" (1002 . "{") (1000 . "qty 4") (1002 . "}"))

_$ (caar x)
"CIRC"

_$ (cdr(car x))
((1002 . "{") (1000 . "qty 4") (1002 . "}"))

_$ (cdr(cdr(car x)))
((1000 . "qty 4") (1002 . "}"))

_$ (cdr(assoc 1000 (cdar x)))
"qty 4"

_$ (nth 1 (cdr(car x)) )
(1000 . "qty 4")

_$ (cdr(nth 1 (cdr(car x))))
"qty 4"

[Anonymous]

Excellent! Thank you dbroad for your time and help.

[Anonymous]

Mr. dbroad if you get a chance

stumped on this.  With e being a valid  entityname the following works

(entmod (list (cons -1 e) '(-3 ("idnumqty" (1000 . "3")))))

however,

(setq xqty "3")

(entmod (list (cons -1 e) '(-3 ("idnumqty" (1000 . xqty)))))

does not work & get this error ; error: bad DXF group: (-3 ("idnumqty" (1000 . XQTY)))

[pbejse]

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@Anonymous wrote:

Mr. dbroad if you get a chance

stumped on this.  With e being a valid  entityname the following works

(entmod (list (cons -1 e) '(-3 ("idnumqty" (1000 . "3")))))

however,

(setq xqty "3")

(entmod (list (cons -1 e) '(-3 ("idnumqty" (1000 . xqty)))))

does not work & get this error ; error: bad DXF group: (-3 ("idnumqty" (1000 . XQTY)))

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with ' (quote) the line will be treated on its face value

(entmod (list (cons -1 e)  (list -3 (list "idnumqty" (cons 1000 xqty)))))

[Anonymous]

Thanks dbroad & pb for all the help and sharing of your knowledge.

Southie

[dbroad]

You're welcome. Glad to help.

[pbejse]

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@Anonymous wrote:

Thanks dbroad & pb for all the help and sharing of your knowledge.

Southie

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Good for you.

Cheers