Using CArgObjects in rust?

[nosjojo]

I'm trying to write a rust library that matches an existing python API, and I'm having trouble figuring out how to correctly define my functions when they're coming from the ctypes library.

The python code does something like this:

def get_values(handle: HANDLE):
    x = ctypes.c_uint(0)
    y = ctypes.c_uint(0)
    z = ctypes.c_uint(0)
    status = lib.call_get_values(ctypes.byref(x), ctypes.byref(y), ctypes.byref(z))
    return x,y,z

and in the rust side, I need to do something like this:

fn call_get_values(x: *mut u32, y: *mut u32, z: *mut u32) -> u32 {
    unsafe {
        *x = 1;
        *y = 1;
        *z = 1;
    }
}

and when those byref() values land in rust, they are being detected as CArgObject. I haven't been able to find a good example of how something like this would work.

Any ideas?

[davidhewitt]

What do you mean by "detected as CArgObject"?

[davidhewitt]

I think you might want ctypes.addressof(x) to give you an integer pointer, rather than ctypes.byref(x).

[nosjojo]

I agree - but unfortunately I'm not able to touch that part of the code, as that's from a 3rd party library.

[davidhewitt]

Right I see. I think in that case you will probably have to look at the byref object and figure out how to get to the contents. Your #[pyfunction] can take Bound<'py, PyAny> as the input

[davidhewitt]

(it looks like the internals of byref are an implementation detail of ctypes.)