IP_MREQ_SOURCE

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct IN_ADDR
{
    public _S_un_e__Union S_un;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct IP_MREQ_SOURCE
{
    public IN_ADDR imr_multiaddr;
    public IN_ADDR imr_sourceaddr;
    public IN_ADDR imr_interface;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure IN_ADDR
    Public S_un As _S_un_e__Union
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure IP_MREQ_SOURCE
    Public imr_multiaddr As IN_ADDR
    Public imr_sourceaddr As IN_ADDR
    Public imr_interface As IN_ADDR
End Structure

import ctypes
from ctypes import wintypes

class IN_ADDR(ctypes.Structure):
    _fields_ = [
        ("S_un", _S_un_e__Union),
    ]

class IP_MREQ_SOURCE(ctypes.Structure):
    _fields_ = [
        ("imr_multiaddr", IN_ADDR),
        ("imr_sourceaddr", IN_ADDR),
        ("imr_interface", IN_ADDR),
    ]

#[repr(C)]
pub struct IN_ADDR {
    pub S_un: _S_un_e__Union,
}

#[repr(C)]
pub struct IP_MREQ_SOURCE {
    pub imr_multiaddr: IN_ADDR,
    pub imr_sourceaddr: IN_ADDR,
    pub imr_interface: IN_ADDR,
}

import "golang.org/x/sys/windows"

type IN_ADDR struct {
	S_un _S_un_e__Union
}

type IP_MREQ_SOURCE struct {
	imr_multiaddr IN_ADDR
	imr_sourceaddr IN_ADDR
	imr_interface IN_ADDR
}

type
  IN_ADDR = record
    S_un: _S_un_e__Union;
  end;

  IP_MREQ_SOURCE = record
    imr_multiaddr: IN_ADDR;
    imr_sourceaddr: IN_ADDR;
    imr_interface: IN_ADDR;
  end;

const IN_ADDR = extern struct {
    S_un: _S_un_e__Union,
};

const IP_MREQ_SOURCE = extern struct {
    imr_multiaddr: IN_ADDR,
    imr_sourceaddr: IN_ADDR,
    imr_interface: IN_ADDR,
};

type
  IN_ADDR {.bycopy.} = object
    S_un: _S_un_e__Union

  IP_MREQ_SOURCE {.bycopy.} = object
    imr_multiaddr: IN_ADDR
    imr_sourceaddr: IN_ADDR
    imr_interface: IN_ADDR

struct IN_ADDR
{
    _S_un_e__Union S_un;
}

struct IP_MREQ_SOURCE
{
    IN_ADDR imr_multiaddr;
    IN_ADDR imr_sourceaddr;
    IN_ADDR imr_interface;
}