Hi,
i've currently started experimenting with the FFI interface provided by
the chicken compiler and have some principle questions about its common
usage.
Assume the given C Code:
struct color {
int red;
int green;
int blue;
int alpha;
};
struct color* alloc_new_color(int red, int green, int blue, int alpha);
1) How do you interface allocation methods in generell with avoidance of
memory leaks?
From the documentation i know, you can write:
(define-foreign-type color* (pointer (struct "color"))))
(define alloc_new_color (foreign-lambda color* "alloc_new_color" integer
integer integer integer))
But this expects the user have to free the memory manually.
Is there an uncomplicated way to register some automechanism?
2) How can i solve this problem:
void rgb_to_hsl(struct color* rgb, float* hue, float* sat, float* lum);
This is simple conversation method that uses multiple return values
(hue, sat, lum).
How can i write a ffi define that accepts an argument of type "color*"
and returns a scheme-vector with three elements?
Hope its not too basic for you. :)
Chris
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