Re: [Chicken-users] easyffi usage

[Thomas Chust]

William Xu wrote:

> [...]
>     (foreign-declare "
>     double my_pi;
>     ")
>     
>     (foreign-parse "
>     double my_pi = 3.14;
>     ")
>     
>     (print (sin my_pi))
> [...]

Hello,

if I'm not mistaken, easyffi generates parameter style procedures to 
acces global C variables, probably because it is impossible in CHICKEN 
to create "magic" Scheme variables that map directly to C variables.

Therefore the correct way to use my_pi in your example would be

  (print (sin (my_pi)))

As my_pi isn't declared constant you could also modify its value using a 
call like

  (my_pi 3.1415)

cu,
Thomas