Re: [Caml-list] interfacing C and OCaml

["Jean-Baptiste Rouquier" <jb.rouquier@wanadoo.fr>]

> Can anybody explain me if there is anyway that I can pass in
> a (int*int*int*int*int) from a C function to OCaml.

Do you want to call C auxiliary function from Caml, or are you writing your
main programm in C and using some Caml functions ?
Both are very well explained in the manual, though it may take a while to
read it.
Don't hesitate to ask me for a complete example if your main programm is in
Caml (I haven't learn yet how to write the main programm in C).



------------------------------------------------
À propos, I have some questions about the manual :
1. Should I use
CAMLprim value input(value channel, value buffer, value offset, value
length)
{
  return ...
}

as in 18.1.2 in the manual, or

void foo (value v1, value v2, value v3)
{
CAMLparam3 (v1, v2, v3);
...
CAMLreturn0;
}

as in 18.5.1, or both ? I think at least the second.


------------------------------------------------
2.
I use
  alloc(2*n, Double_array_tag.)
to create a float array of size n (then I initialize it), is it correct ?


------------------------------------------------
3. Is it correct to store p in the custom block v by
CAMLlocal(v);
v = alloc_custom(ops, 4, 0, 1);
(my_type *) Data_custom_val(v) = p;
?
When does the parameter "size" (here "4") vary ?

Thanks,
Jean-Baptiste.








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