A couple of people have suggested that my picturing-programs teachpack include
some variables containing the images used in the textbook. So I added a
"book-pictures.rkt" file to the teachpack, saying things like
#lang racket
(define calendar )
with an image inserted as the value of the variable. I can "run" that file by
itself, but when I "require" it from another file, as in
#lang racket
...
(require "book-pictures.rkt")
...
(provide (all-from-out "book-pictures.rkt"))
I get an odd error message:
write: cannot marshal value that is embedded in compiled code:
(object:image-snip% ...)
Does this actually mean I can't compile code that contains image literals?
If so, I guess there's a workaround: include the image files with the
teachpack, and say
(define calendar (bitmap "calendar.png"))
But would this approach re-load the image file every time anybody require-d the
teachpack?
Stephen Bloch
sbl...@adelphi.edu
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