[Chicken-users] Type conversion in the FFI

[Daniel B. Faken]

Hello all,

  I have C functions which return a boolean value of type (unsigned char).
How can I get chicken to convert these to/from its own boolean values.  I 
tried the __declare(type, ..) operation, but that tries to redefine my 
C boolean type ("BOOL") as an int: "#define BOOL int" is inserted into the 
file.  This changes the C semantics, which I would like to avoid.. (e.g. 
an array of these values wouldn't be properly conveted).

  I also tried (define-foreign-type), but couldn't get it to work either.  
At present I am just using (integer->char 1) or (not (eq? (char->integer 
(C-fn) 0)), but its kinda clumsy..

  On an unrelated note, where can I find out more about "properties", as 
mentioned in the hash-table docs?  These seem to be a common feature of 
LISP/scheme, but I couldn't find anything in R5RS..

thanks!
Daniel Faken