【AutoLISP FIRST STEP】Uppercase？Lowercase？

AutoLISP　Uppercase / Lowercase

AutoLISP is NOT case-sensitive.
Therefore:

(defun c:hellow () (alert “Hello World”))

(DEFUN C:HELLO () (ALERT “Hello World”))

both have the same result.

Exception

Dialog Box

When an AutoLISP program uses a Dialog Box, it needs another language called Dialog Control Language(DCL).

DCL is case-sensitive.

AutoLISP communicates DCL by value called “Key”.
Because DCL is case-sensitive, the value of the “Key” in the AutoLISP has to match to the value of the Key in the DCL.

To Compare Strings

AutoLISP function = and wcmatch are case-sensitive.

For example, (= “A” “a”) or (wcmatch “A” “a”) return nil because these functions judge “A” and “a” are different strings.

Function strcase make all text to uppercase.
If you want to match without case-sensitivity, function strcase might be useful.

(= “A” (strcase “a”))
(wcmatch “A” (strcase “a”))

JagaimoLISP Own Rule　

Even though AutoLISP is not case-sensitive, having a rule makes it easy to read programs.
Here is my rule:

• AutoLISP function name: Lowercase
• AutoCAD command: Uppercase
• Variable Symbol name: Mix　(ex. ObjCol）
• DCL Key: same as Variable Symbol

To Sum Up

• Basically, AutoLISP is NOT case-sensitive.
• Dialog Control Language (DCL) is case-sensitive.
• AutoLISP and DCL communicates with “Key”.
• The Value of the Key must match.
• = and wcmatch are case-sensitive.

【AutoLISP Lesson】 FIRST STEP

Jagaimo First Step Articles which you should know before start making your original command with AutoLISP

jagaimolisp.com

2021.11.23