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Replacing a Dynamic Block with another

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Hey everyone .. Anyone know or have a lisp that will replace one dynamic block with another and take its properties if all of the criteria matches in that block.



Joey G

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Lee-mac has a good dynamic block lisp to get the original properties like dynamic name and value. Then erase block insert new and use those values in a new block.


You could do a match list of dyn names ((dyn1 dynx)(dyn2 dyny)….. if same order of creation even easier.

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Emmanuel Delay

Not sure if it works for every prop that you need, but try this


Command RDP


;; http://www.lee-mac.com/dynamicblockfunctions.html

;; Get Dynamic Block Properties  -  Lee Mac
;; Returns an association list of Dynamic Block properties & values.
;; blk - [vla] VLA Dynamic Block Reference object
;; Returns: [lst] Association list of ((<prop> . <value>) ... )
(defun LM:getdynprops ( blk )
    (mapcar '(lambda ( x ) (cons (vla-get-propertyname x) (vlax-get x 'value)))
        (vlax-invoke blk 'getdynamicblockproperties)

;; Set Dynamic Block Properties  -  Lee Mac
;; Modifies values of Dynamic Block properties using a supplied association list.
;; blk - [vla] VLA Dynamic Block Reference object
;; lst - [lst] Association list of ((<Property> . <Value>) ... )
;; Returns: nil
(defun LM:setdynprops ( blk lst / itm )
    (setq lst (mapcar '(lambda ( x ) (cons (strcase (car x)) (cdr x))) lst))
    (foreach x (vlax-invoke blk 'getdynamicblockproperties)
        (if (setq itm (assoc (strcase (vla-get-propertyname x)) lst))
            (vla-put-value x (vlax-make-variant (cdr itm) (vlax-variant-type (vla-get-value x))))


;; https://www.cadtutor.net/forum/topic/18257-entmake-functions/
(defun drawInsert (pt Nme)
 (entmakex (list (cons 0 "INSERT")
                 (cons 2 Nme)
                 (cons 10 pt)))


;; returns the common props, so we don't set props that don't exist on the destination block
(defun common_props (props1 props2 / res)
  (setq res (list))
  (foreach a props1
    ;; see if that prop exists in props2
    (if (assoc (car a) props2)   ;; skip "Origin"
      (if (/= "Origin" (car a))
        (setq res (append res (list a)))

;; RDP for Replace Dynamic Block
(defun c:rdp ( / blk props1 props2 cprops bname pt dblok)
  ;; read source block
  (setq blk (car (entsel "\nSelect source block: ")))
  (setq props1 (LM:getdynprops  (vlax-ename->vla-object blk)))
  ;; insert destination block
  (setq bname (getstring "\nEnter blockname of the destination block: "))
  (setq pt (cdr (assoc 10 (entget blk))))
  (setq dblk (drawInsert pt bname))
  (setq props2 (LM:getdynprops  (vlax-ename->vla-object dblk)))
  ;; set common props
  (setq cprops (common_props props1 props2))
  (LM:setdynprops (vlax-ename->vla-object dblk) cprops)
  ;; delete source
  (entdel blk)

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