(defun cb:...)

bartdewilde · 发表于 2022-7-6 14:25:10

hello

i'm starting with autocad lisp

i've learnd that you start a routine with

(defun c:name ....)

but now i've found a program that start with

(defun cb:hdis (/ld)

this comes back with the variables

if (= (type cb:ld) 'str

i understand the meanig of this code exept what te cb: means

can someone tell me what's the difference between defun c: and defun cb:

VVA · 发表于 2022-7-6 14:37:21

By analogy to this article, I have written article on use of a code from a forum in Russian, where has a little expanded the description.
As I not so well know English, therefore I will take advantage of machine translation. I hope, it will be clear, and if is not present, me will correct.

In your case it is function and it needs to be caused so: (cb:hdis)

Commandobill · 发表于 2022-7-6 14:44:45

I believe I've seen that lisp before. "cb:" doesnt actually do anything. That code is just a function. if you were to type in "hdis" as a command it wouldnt do anything. but if you were to use it like this (cb:hdis) it would run. Why they named it that way is unknown to me but im sure they had their reasons.

Commandobill · 发表于 2022-7-6 14:54:10

Too little too late it seems. Good description VVA

Lee Mac · 发表于 2022-7-6 14:56:14

Nice once VVA, but, yes, I believe its just irresponsible function naming...

rkmcswain · 发表于 2022-7-6 15:09:45

I wouldn't bet on it... I do this all the time. Useful for identification.

David Bethel · 发表于 2022-7-6 15:14:01

I agree. I use function name prefixes all of the time. My preference is to use an underscore delimiter , but a colon is just as valid. My $0.02 -David

Lee Mac · 发表于 2022-7-6 15:20:03

You mean using the function syntax as a prefix for sub_routines - I suppose its good for reference, but the function begins with a c..: I suppose it could confuse the LISP novice...

rkmcswain · 发表于 2022-7-6 15:32:32

Possibly, but still nothing wrong with it. I do this sometimes within the same file. Say my file (and main function is named) CHTXT - i might name my internal functions things like:

copy

(defun chtxt:myfunc ()  (blah_blah))

Of course, like David says, just my 2¢.

[编程交流] (defun cb:...)

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