Computer Science

Lisp Load Function

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Join Date: Mar 2007

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WD40

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Lisp Load Function

Mar 21st, 2007

I am using common lisp for customizing CoCreate Cad software.
I am confused regarding the load function.

The following command will load the indicated file:
(load "c:\\temp\\testload")

The following will load the 2nd item but the 1st item exists:
(load "c:\\temp\testload"
if-does-not-exist
(load "c:\\temp\\testload2")
)

Could somebody please explain why the testload will not load, even though it exists?

The files do not have a file extension and I'd like to run it this way.

Thank You
Bill

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Join Date: Jun 2005

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Rashakil Fol Rashakil Fol is offline

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Re: Lisp Load Function

Mar 21st, 2007

You're missing a slash. You mean \\testload.

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Join Date: Aug 2005

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indienick

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Re: Lisp Load Function

Mar 22nd, 2007

When referring to file paths in Common LISP, it's best to either use the pathname directive:
(load #p("/path/to/file")
-or-
...better yet, just use the arbitrary pathname tricks in Common LISP:



(load (make-pathname

         :device "c"

         :directory '(:absolute "temp")

         :name "testload"))

Now, however, there's a problem with the syntax of your code; proper Common LISP code for your little snippet should read (NOTE: This example's using arbitrary pathnames.):



(load (make-pathname

         :device "c"

         :directory '(:absolute "temp")

         :name "testload")

  :if-does-not-exist (load (make-pathname :device "c" :directory '(:absolute "temp") :name "testload2"))

Last edited by indienick; Mar 22nd, 2007 at 5:36 pm.

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Join Date: Mar 2007

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WD40

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Re: Lisp Load Function

Mar 23rd, 2007

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Originally Posted by Rashakil Fol

You're missing a slash. You mean \\testload.

This was a typing error in this message. The code has the proper backslash and it still will not work properly.

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hexagon2008 hexagon2008 is offline

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Re: Lisp Load Function

Jul 1st, 2008

•

Originally Posted by WD40

I am using common lisp for customizing CoCreate Cad software.
I am confused regarding the load function.

The following command will load the indicated file:
(load "c:\\temp\\testload")

The following will load the 2nd item but the 1st item exists:
(load "c:\\temp\testload"
if-does-not-exist
(load "c:\\temp\\testload2")
)

Could somebody please explain why the testload will not load, even though it exists?

The files do not have a file extension and I'd like to run it this way.

Thank You
Bill