ASCII Code Conversion

AutoLISP provides the ascii and chr functions that handle decimal ASCII codes. The ascii function returns the ASCII decimal value associated with a string, and chr returns the character associated with an ASCII decimal value.

To see your system's characters with their codes in decimal, octal, and hexadecimal form, save the following AutoLISP code to a file named ascii.lsp. Then load the file and enter the new ASCII command at the AutoCAD Command prompt. This command prints the ASCII codes to the screen and to a file called ascii.txt. The C:ASCII function makes use of the BASE function. You may find this conversion utility useful in other applications.

; BASE converts from a decimal integer to a string in another base.
(defun BASE ( bas int / ret yyy zot )
  (defun zot ( i1 i2 / xxx )
	(if (> (setq xxx (rem i2 i1)) 9)
	(chr (+ 55 xxx))
	(itoa xxx)
  (setq ret (zot bas int) yyy (/ int bas))
  (while (>= yyy bas)
	(setq ret (strcat (zot bas yyy) ret))
	(setq yyy (/ yyy bas))
  (strcat (zot bas yyy) ret)
(defun C:ASCII ( / chk out ct code dec oct hex )
  (initget "Yes")
  (setq chk (getkword "\nWriting to ASCII.TXT, continue? <Y>: "))
  (if (or (= chk "Yes")(= chk nil))	(progn
	(setq out (open "ascii.txt" "w") chk 1 code 0 ct 0)
	(princ "\n \n CHAR   DEC  OCT  HEX \n")
	(princ "\n \n CHAR   DEC  OCT  HEX \n" out)
	(while chk
		(setq dec (strcat "  " (itoa code))
		oct (base 8 code) hex (base 16 code))
		(setq dec (substr dec (- (strlen dec) 2) 3))
		(if (< (strlen oct) 3)(setq oct (strcat "0" oct)))
		(princ (strcat "\n " (chr code) "	" dec " "
		oct "  " hex ) )
		(princ (strcat "\n " (chr code) "	" dec " "
		oct "  " hex ) out)
		((= code 255)(setq chk nil))
		((= ct 20)
			(setq xxx (getstring 
			 "\n \nPress 'X' to eXit or any key to continue: "))
			(if (= (strcase xxx) "X")
			(setq chk nil)
				(setq ct 0)
				(princ "\n \n CHAR   DEC  OCT  HEX \n")
		(setq ct (1+ ct) code (1+ code))
	(close out)
	(setq out nil)