Re: Problem with fast-file-io example...

[bill@cambridge.apple.com (Bill St. Clair)]

>>  I was trying to use the fast-file-io code in the Examples folder
>>supplied with MCL, and am getting error #-43 when I try to call
>>(with-fsopen-file...).  Is there a problem with this code?  Is the
>>problem potentially with my Mac?  What is the (fswrite...) function
>>expecting for the "buffer" argument?  Any examples out there?
>
>I assume you mean "mac-file-io.lisp". Here's an example of using
>it. The "buffer" argument is a macptr pointing to an area of
>memory big enough for "count" bytes.
>
>; This always overwrites an existing to-file
>(defun my-copy-file (from-file to-file)
>  (with-FSOpen-file (from-pb from-file)
>    (setq to-file (merge-pathnames to-file from-file))
>    (create-file to-file :if-exists nil)
>    (with-FSOpen-file (to-pb to-file t)
>      (%stack-block ((buf 512))
>        (let ((size (getEOF from-pb)))
>          (loop
>            (when (<= size 0) (return))
>            (let ((bytes (min size 512)))
>              (fsRead from-pb bytes buf)
>              (fsWrite to-pb bytes buf)
>              (decf size 512))))))))

Another comment. Error number -43 is "File not found." This probably
means you were trying to open a file for output. Note that you
must call CREATE-FILE explicitly to create a file that you plan
to open for output with FSOpen.