topic error in Visual LISP, AutoLISP and General Customization Forum

error

Anonymous — Wed, 19 Apr 2017 08:25:49 GMT

Hello, Community.

I studied *error* handling in last week.

When I tested it, I don't know what is mean msg variable.

(defun *error* ( msg )
(princ "\n*error* outside of test program.")
(princ)
)

(Lee-mac made the lisp.)

When I delete the msg variable.

That does not activate the function.

Thanks.

cadffm — Wed, 19 Apr 2017 08:34:09 GMT

Its for compatibility, Acad errors give an message what going wrong, so you need one argument. Its your choice to use it.

(defun *error* ( )....

=> error "too many Arguments

Test:
(defun *error* ( msg )
(princ (strcat "\n*error* outside of test program. (" msg ")"))
(princ)
)

(/ 1 0)

(strlen 1)