AutoCAD Visual LISP / AutoLISP :: How To Define A Function With Negligible Arguments

Jun 25, 2013

I prepared a code to calculate number of days between two date.

I want to know how can I define negligible arguments for my lisp routins. It means if I omitted the arguments, lisp code can handle it without any errors ("; error: too few arguments")

In this case, my program defined as:  (TotalDays 1st_date 2nd_date)

(TotalDays 1978 03 21 2013 06 25)

and I want to have flexibility: if I use this routine as (TotalDays 1978 03 21), the program should substitute today's date with second date.

I know if I put "nil" instead of date for 2nd_date, It will not be an error, because:

(if (and y2 m2 d2) (setq n2 (GetJDN y2 m2 d2))(setq n2 (fix (getvar "DATE"))))

but that's not my favourite!, how can I omitted 2nd_date completely? as (TotalDays 1978 03 21)

Here is my lisp

;|How to use:(TotalDays 1978 03 21 2013 06 25)|;;;;;By Abbas Aqdam(defun TotalDays ( y1 m1 d1 y2 m2 d2 / n1 n2)(setq n1 (GetJDN y1 m1 d1))(if (and y2 m2 d2) (setq n2 (GetJDN y2 m2 d2))(setq n2 (fix (getvar "DATE"))))(abs(- n1 n2)));;;;Leap years are included;;;;By Abbas Aqdam(defun GetJDN ( year month day / a y m J)(setq a (/(- 14 Month) 12))(setq y (-(+ year 4800) a))(setq m (-(+ Month (* 12 a)) 3))(setq J (-(+ day (/(+(* 153 m) 2)5) (* 365 y) (/ y 4) (/ y 400)) (/ y 100) 32045)))

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AutoCAD Visual LISP / AutoLISP :: No Function Definition With Distance Function

Oct 25, 2013

This seems absolutly silly.

(setq p1 (getpoint))
(setq p2 (getpoint))

(setq Dist (distance p1 p2))

Why does this not work?

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May 7, 2013

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which code i have to change and how  for set my lisp on radio buttons ..

here is the sample codes ...

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[Code].....

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AutoCAD Visual LISP / AutoLISP :: Expire Date For A Function

Nov 27, 2012

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define a ExpDt variable that contains Expiry Date as a string. And add some statements inside of the LISP program to call this variable and check it with today's date.

I should define once time in autocad:

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and check this every time that a lisp program should be execeute:

(getenv "expdt") ; if today's date(with YYMMDD format) ">" expdt then lisp program doen not allow to run and should be halted.

for e.g. on 2013.02.28: "130228" > "130101" ==> so the lisp function should be halted and will not work!

(without any alert or message)

a sample list function: (how can implement on this lisp function?)

(defun c:3()
(setq w t)
(while w
(setq a (getpoint "
pick point:"))
(setq p1 (list (- (car a) 0.5)(- (cadr a) 0.5)))
(setq p2 (list (+(car a) 0.5)(+(cadr a) 0.5)))
(command "erase" "w" p1 p2 "")
(command "INSERT" "*3" a "" "" "0")
)
(if (= a nil)(setq w nil))

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Dec 29, 2011

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Aug 17, 2012

The error below has appeared randomly when AutoCAD 2011 is started.  There was not an error of this sort, but it suddenly appeared and some of the LISP routines will no longer work. 

*Invalid attempt to access

a compiled function definition.  You may want to define it using defun-q:

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Jan 10, 2013

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Jun 3, 2013

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Mar 13, 2012

I open the drawing without loading the function, when I modify an object with the reactors appears the following error message:

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AutoCAD Visual LISP / AutoLISP :: STRNUM Error - No Function Definition

Jan 10, 2012

I D/L a lisp file (setvars.lsp) that purports to give a list of system variables that match a short string entered in a dialog box.

Unfortunately, an error arises that says 'error : no function definition: STRNUM'

I've looked at the code and can't tell what the writer was hoping to achieve.

The specific section is as follows:

    (if F1
      (progn
        (setq RL (read-line F1))
        (while RL
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                   (wcmatch (strcase RL) (strcase (strcat "*" DESCR2 "*")))
[Code] .........

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If necessary I can post the whole lisp and dat file, but was hoping to discover the intention from the above extract and therfore where I might work out an alternative to this line.

Looking to turn a string to a real? If so, why are there two 'arguments' following the 'function' STRNUM?

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Nov 15, 2013

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I've attached the script file as well. (I couldn't attach .scr format so you may need to rename it).

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Sep 16, 2013

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I've got a subroutine that gets the centroid of a closed polygon (lwpoly).  It appears to fail if the polygon has any zero length line segments.  I've added a trap that catches the error and "highlights" the offending polygon, but it stops there and does not return to the main function that called the subroutine.  Is there a way to get back to the main function from the trap?

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(setq *error* trap1)
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[code]....

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Nov 14, 2013

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Oct 7, 2013

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attached is what I have written so far:-

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Sep 7, 2012

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I tried :

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(if
(and (a) (1)
)
(command ...

but was unsuccessful.  no matter which combination was selected, the command under all combinations would run.

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Jun 3, 2013

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Oct 9, 2013

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Dec 30, 2011

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Nov 8, 2011

I upgraded from Autocad 2004 to 2012 recently and my lisp file doesnt work anymore.

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Oct 27, 2012

I need a program that simulate this DOS command: dir /on/b *.dwg >list.txt

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test2.dwg
test100.dwg
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[code]...

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