How to copy structure from C to mJS?

General
1

I’m writing a program where I need to copy a structure from C to mJS.

I found an example of how to use the s2o function but I don’t know how to complete the s parameter from the function
// Assuming s is a foreign pointer to an instance of my_struct, obtained elsewhere.
let o = s2o(s, sd);

How do I pass s as a pointer to the energy structure?

my C Code

> struct my_struct {
>   int phases;
>   float v1;
>   float v2;
>   float v3;
>   float i1;
>   float i2;
>   float i3;
> } energy;
> 
> static const struct mjs_c_struct_member my_struct_descr[] = {
>   {"phases", offsetof(struct my_struct, phases), MJS_STRUCT_FIELD_TYPE_INT, NULL},
>   {"v1", offsetof(struct my_struct, v1), MJS_STRUCT_FIELD_TYPE_FLOAT, NULL},
>   {"v2", offsetof(struct my_struct, v2), MJS_STRUCT_FIELD_TYPE_FLOAT, NULL},
>   {"v3", offsetof(struct my_struct, v3), MJS_STRUCT_FIELD_TYPE_FLOAT, NULL},
>   {"i1", offsetof(struct my_struct, i1), MJS_STRUCT_FIELD_TYPE_FLOAT, NULL},
>   {"i2", offsetof(struct my_struct, i2), MJS_STRUCT_FIELD_TYPE_FLOAT, NULL},
>   {"i3", offsetof(struct my_struct, i3), MJS_STRUCT_FIELD_TYPE_FLOAT, NULL},
>   {NULL, 0, MJS_STRUCT_FIELD_TYPE_INVALID, NULL},
> };
>
> const struct mjs_c_struct_member *get_my_struct_descr(void) {
>   return my_struct_descr;
> };

my mJS Code

let sd = ffi('void *get_my_struct_descr(void)')();
let o = s2o(s, sd);
print(o.v1, o.i1);
2

Hi i found solution

in C add
const struct my_struct *get_my_struct_pointer(void)
{
return &energy;
};

in mJS file add
let s = ffi(‘void *get_my_struct_pointer(void)’)();