; The following program is sample output from the LISP Generator (more info at www.LispGen.com). 
; The LISP Generator is a full-featured code generator for Autocad's AuotLISP language.
; Legal notices:
; - This sample program is intended as a demonstration only.
; - The program is available on an 'as-is' basis with no warranties, either expressed or implied, of any kind.
; - The program may only be used at the user's own risk.
; - No license or rights to the code are either given or forfeited.
; Everything that follows is direct and unaltered output from the LISP Generator.

; This program was created on December 8 2006 using the LISP Generator.

; Define the function (the program). 
(defun c:FILE2TXT ( / FN1 FL1 HNDL-IN I TXTSTR-IN ENT OLDCE OLDERR OLDTE)
  ; Save the current value of cmdecho then redefine it. 
  (setq OLDCE (getvar "cmdecho"))
  (setvar "cmdecho" 1)
  ; Save the current value of texteval then set it to 1
  (setq OLDTE (getvar "texteval"))
  (setvar "texteval" 1)
  ; Save the current value of the error handling subroutine then redefine it. 
  (setq OLDERR *error*)
  (defun *error* (errmes)
    (princ (strcat "\nExecution of FILE2TXT halted by the following error: " ERRMES))
    (setvar "cmdecho" OLDCE)
    (setq *error* OLDERR)
    (prin1)
  )
  ;(setq *error* nil)
  ; NOTE: to turn error handling off, erase the semicolon in the line above. 

  ; GET a FILE from the user and store it in FN1. 
  (setq FN1 (getfiled "File to read" "textout.txt" "" 12))

  ; OPEN file FN1 for reading as FL1. 
  (setq FL1 (open FN1 "r")) 

  ; BEGIN LOOP loop1.
  ; LOOP by STEPPING THROUGH the LINES of the FILE FL1, storing them in HNDL-IN. 
  (setq I -1)
  (while (setq HNDL-IN (read-line FL1))
    (setq I (1+ I))

    ; READ a line from file FL1 storing it in TXTSTR-IN. 
    (setq TXTSTR-IN (read-line FL1))

    ; OPERATION - store the result in ENT.  
    (setq ENT (HANDENT HNDL-IN))

    ; MODIFY the code 1 value (Text string)  of the entity ENT. 
    (if (assoc 1 (entget ENT))
      (entmod (subst (cons 1 TXTSTR-IN) (assoc 1 (entget ENT)) (entget ENT)))
      (entmod (cons (cons 1 TXTSTR-IN) (entget ENT)))
    )

  ) ; END LOOP loop1.
  ; CLOSE file FL1. 
  (close FL1)

  ; Reset "cmdecho" to previous value. 
  (setvar "cmdecho" OLDCE)
  ; Reset "texteval" to previous value. 
  (setvar "texteval" OLDTE)
  ; Reset *error* to previous definition. 
  (setq *error* OLDERR)
  ; Exit quietly (no return value.)
  (prin1)
)