The value I was returning is whatever kind of object is returned when you embed an image in the Definitions window. That is, this was a pasted, atomic image, not one created by a computation. I guess they're not treated the same, but I'm surprised that ASL processing the Definitions window didn't do the right conversion...
On Thu, Aug 26, 2010 at 8:25 PM, Robby Findler <ro...@eecs.northwestern.edu> wrote: > At the moment there is a barn-door sized security hole in DrRacket, > whereby it will take any snip% instance from the user's program and > just display it in the repl. You can exploit this for Good by making > the current-print of your language turn some values into snips (like > images and things). 2htdp/image already does this, so that should just > work if you return those. Its hard to tell what value Shriram's > program was returning tho. But if it is a bitmap% object, he just has > to do > > (make-object image-snip% ...the-bitmap-goes-here...) > > We will close this hole at some point, when we have a reasonable way > to allow people to add new kinds of values without the security > breach. > > Robby > > On Thu, Aug 26, 2010 at 6:17 PM, Jay McCarthy <jay.mccar...@gmail.com> wrote: >> From what I can tell, it comes from ensuring that DrRacket shares the >> htdp/image (or whatever) namespace with the running program so the >> structs are the same and DrRacket's default renderer is detecting it. >> I'm not sure how to replicate it though. (I tried for a bit so I could >> make #lang frtime work.) >> >> Jay >> >> On Thu, Aug 26, 2010 at 11:55 AM, Shriram Krishnamurthi <s...@cs.brown.edu> >> wrote: >>> What is the #lang magic that makes >>> >>>> (get-image-from-web "http://racket-lang.org/logo.png";) >>> (instantiate (class ...) ...) >>> >>> show the image rather than just its constructor? >>> >>> Shriram >>> _________________________________________________ >>> For list-related administrative tasks: >>> http://lists.racket-lang.org/listinfo/dev >>> >> >> >> >> -- >> Jay McCarthy <j...@cs.byu.edu> >> Assistant Professor / Brigham Young University >> http://teammccarthy.org/jay >> >> "The glory of God is Intelligence" - D&C 93 >> _________________________________________________ >> For list-related administrative tasks: >> http://lists.racket-lang.org/listinfo/dev > _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
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