LISP Code to Select Block in Layouts and Update Attributes

This may be an alternative method the idea is it will work with any block in a layout has no limit on the number of atts updated 1 -> all. Rather than use tag name uses attribute creation order.

It is written to read a file input as that wa sthe original post request but could be changed for a more user version when making the paired list of attribute order and new value. Either as a dcl entry I am pretty sure I have that.

(ah:blockupdater lst) where lst is ((1 "BT Group LLC")(2 "Job Name")( 3 "BT") ( 12 "9/13/17")) etc

; a universal block attribute updater allows for input from file.
; By Alan H 2017
(defun ah:blockupdater ( / newline bname )
(setq fo (open "c:\\temp\\blkupdate.txt" "R"))
(setq 1stline  (read-line fo) ) ; 1st line Model or Layouts
(setq bname  (read-line fo) ) ; block name

; make a list of pairs position and new variable
(setq lst '() )
(while (setq newline (read-line fo)) 
(setq x (vl-string-search "," newline))
(setq pos (substr newline 1  x))
(setq newval (substr newline (+ x 2)))
(setq lst (cons pos lst))
(setq lst (cons newval lst))
)
(setq lst (reverse lst))
(close fo)

; other criteria ?
(cond ((= "MODEL" (strcase 1stline)(do-model-blocks))
            ((= "LAYOUTS" (strcase 1stline))(do-layout-blocks))
)
) ;defun

(defun do-model-blocks ( / ss)
(setvar 'ctab "Model")
(setq ss (ssget "x"  (list (cons 0 "INSERT") (cons 2 bname)(cons 410 "Model"))))
(ah:attup)
)

(defun do-layout-blocks ( / doc lay plotabs len tabname x y z ss)

(setq doc (vla-get-activedocument (vlax-get-acad-object)))
(vlax-for lay (vla-get-Layouts doc)
(setq plotabs (cons (vla-get-name lay) plotabs))
)

(repeat (length plotabs)
(setq tabname (nth x plotabs))
(if (/= tabname "Model")
(progn
(setvar "ctab" tabname)
(setq ss (ssget "x"  (list (cons 0 "INSERT") (cons 2 bname)(cons 410 tabname))))
(ah:attup)
)
)
)
)

(defun ah:attup ( / x y z)
(repeat (setq x (sslength ss))
(setq obj (vlax-ename->vla-object (ssname  ss (setq x (- x 1))) ) )
(setq atts (vlax-invoke obj  'getattributes))
(setq z 0)

(repeat (setq y (/ (length lst ) 2 ))
(vla-put-textstring (nth  (atoi (nth z lst)) atts)  (nth (+ z 1) lst))
(setq z (+ z 2))
)

)

)  

(princ)      
(ah:blockupdater)

file data

Layouts
Myblockname
1,alan
4,FRED
6,asdf