I was having trouble running the example in the documents:

(foreign-funcall-pointer (foreign-symbol-pointer "abs")

:int -42 :int)

I got SIMPLE-ERROR: Unknown CFFI type: 4.

I was going crazy, until i searched google code and found this working example: http://www.google.com/codesearch/p?hl=en#wVc2UuwHR3k/trunk/tree/resolve.lisp...

Retrying with an added "()" before the arg list works.

foreign-funcall-pointer (foreign-symbol-pointer "abs")

() :int -42 :int)

works !

This allows one to call a defcallback function from lisp

making the following unnecessary in the documentation of defcallback "The macro defcallback defines a Lisp function the can be called from C (but not from Lisp)." because the following works:

(defcallback fx :int ((x :int)) (progn (print "test") 3))

(foreign-funcall-pointer (callback fx) () :int 4 :int)

Thanks for the cffi, Naveen