On 7/7/05, Raffael Cavallaro <[EMAIL PROTECTED]> wrote:
> Can someone provide me with a minimal example scheme file that shows
> proper use of foreign-lambda* or foreign-callback-lambda* or foreign-
> safe-lambda* - in other words, a scheme file that embeds c code in
> the scheme file. Whenever I try to do this I get a linker error
> stating that the symbol in question - the name of the foreign-lambda*
> - prepended by an underscore, e.g., _foo is undefined:
>
> /usr/bin/ld: Undefined symbols:
> _tak
I'm not exactly sure what the problem is here: is tak the name
of a Scheme procedure that you want to call?
Here a few examples (all untested):
;;; simple use of foreign-lambda*:
(define yo
(foreign-lambda* void ((int x))
"printf(\"yo: %d\\n\", x);") )
(yo 33)
;;; simple use with callback:
(define-external (back) void
(print "I'm back!") )
(define call
(foreign-safe-lambda* void ()
"back();") )
(call)
cheers,
felix
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