IGMP_HEADER

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 IGMP_HEADER
{
    public _Anonymous1_e__Union Anonymous1;
    public _Anonymous2_e__Union Anonymous2;
    public ushort Checksum;
    public IN_ADDR MulticastAddress;
}

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 IGMP_HEADER
    Public Anonymous1 As _Anonymous1_e__Union
    Public Anonymous2 As _Anonymous2_e__Union
    Public Checksum As UShort
    Public MulticastAddress As IN_ADDR
End Structure

import ctypes
from ctypes import wintypes

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

class IGMP_HEADER(ctypes.Structure):
    _fields_ = [
        ("Anonymous1", _Anonymous1_e__Union),
        ("Anonymous2", _Anonymous2_e__Union),
        ("Checksum", ctypes.c_ushort),
        ("MulticastAddress", IN_ADDR),
    ]

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

#[repr(C)]
pub struct IGMP_HEADER {
    pub Anonymous1: _Anonymous1_e__Union,
    pub Anonymous2: _Anonymous2_e__Union,
    pub Checksum: u16,
    pub MulticastAddress: IN_ADDR,
}

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

type IN_ADDR struct {
	S_un _S_un_e__Union
}

type IGMP_HEADER struct {
	Anonymous1 _Anonymous1_e__Union
	Anonymous2 _Anonymous2_e__Union
	Checksum uint16
	MulticastAddress IN_ADDR
}

type
  IN_ADDR = record
    S_un: _S_un_e__Union;
  end;

  IGMP_HEADER = record
    Anonymous1: _Anonymous1_e__Union;
    Anonymous2: _Anonymous2_e__Union;
    Checksum: Word;
    MulticastAddress: IN_ADDR;
  end;

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

const IGMP_HEADER = extern struct {
    Anonymous1: _Anonymous1_e__Union,
    Anonymous2: _Anonymous2_e__Union,
    Checksum: u16,
    MulticastAddress: IN_ADDR,
};

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

  IGMP_HEADER {.bycopy.} = object
    Anonymous1: _Anonymous1_e__Union
    Anonymous2: _Anonymous2_e__Union
    Checksum: uint16
    MulticastAddress: IN_ADDR

struct IN_ADDR
{
    _S_un_e__Union S_un;
}

struct IGMP_HEADER
{
    _Anonymous1_e__Union Anonymous1;
    _Anonymous2_e__Union Anonymous2;
    ushort Checksum;
    IN_ADDR MulticastAddress;
}