What you used is called a "computed string" that is, you expect bitmap to evaluate the argument path-stringy to a string.
But, in BSL, bitmap expects to be handed a literal string constant (or a module path): --------------------------------------------------------------------- (require 2htdp/image) ;; with a module path (bitmap 2htdp/planetcute/character-cat-girl.png) ;; with a fixed string (bitmap "plt/pkgs/htdp-pkgs/htdp-lib/2htdp/planetcute/character-cat-girl.png") --------------------------------------------------------------------- Both of these will succeed and retrieve the cat girl from the Planet Cute collection that comes with Racket -- Matthias On Oct 4, 2014, at 9:36 AM, Andrew Ulrich wrote: > Hi, I've got a really simple problem, I think. Why is it that when I try to > do the following: > > (require 2htdp/image) > (define path-stringy "images/some.png") > (bitmap (path-stringy)) > > I get the following error: > bitmap: expected the argument to specify a local path (via a string) or a > module path (e.g. `icons/b-run.png') in: (bitmap (path-stringy)) > > I mean, shouldn't path-stringy evaluate to a string before it's passed into > bitmap? If not, then how do I use bitmap for anything dynamic? > > Thanks, > Andrew > ____________________ > Racket Users list: > http://lists.racket-lang.org/users ____________________ Racket Users list: http://lists.racket-lang.org/users
