Memory 在 Rust FFI 中处理

Question

In my Rust code I have to use some C function in the Rust side. In that function I have to pass some structures as example.

#[repr(C)]
pub structA {
    pub buffer:[i8; 8000],
    pub writing: i32,
    pub written_num: i32,
    pub write_index: i32,
    pub id: i32,
    pub sortArray: StructB,
}

FFI calling part

let mut struc_a = Box::new(structA::new());
unsafe {
    ProcessStrucA(&mut *structA);
}

structure in C side

typedef struct {
    char buffer[8000];
    size_t writing;
    size_t written_num;
    size_t write_index;
    int id;
    StructB structB;
} structA;

When I'm passing above structure to C side it will not get the values which we send from the Rust side. According to my understanding this could be happening due to invalid memory handling. How do I resolve this issue?

Answer 1

I have changed the buffer type::std::os::raw::c_char then it works as expected. Thanks