IP_MSFILTER

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_MSFILTER
{
    public IN_ADDR imsf_multiaddr;
    public IN_ADDR imsf_interface;
    public int imsf_fmode;
    public uint imsf_numsrc;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1)] public IN_ADDR[] imsf_slist;
}

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_MSFILTER
    Public imsf_multiaddr As IN_ADDR
    Public imsf_interface As IN_ADDR
    Public imsf_fmode As Integer
    Public imsf_numsrc As UInteger
    <MarshalAs(UnmanagedType.ByValArray, SizeConst:=1)> Public imsf_slist() 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_MSFILTER(ctypes.Structure):
    _fields_ = [
        ("imsf_multiaddr", IN_ADDR),
        ("imsf_interface", IN_ADDR),
        ("imsf_fmode", ctypes.c_int),
        ("imsf_numsrc", wintypes.DWORD),
        ("imsf_slist", IN_ADDR * 1),
    ]

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

#[repr(C)]
pub struct IP_MSFILTER {
    pub imsf_multiaddr: IN_ADDR,
    pub imsf_interface: IN_ADDR,
    pub imsf_fmode: i32,
    pub imsf_numsrc: u32,
    pub imsf_slist: [IN_ADDR; 1],
}

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

type IN_ADDR struct {
	S_un _S_un_e__Union
}

type IP_MSFILTER struct {
	imsf_multiaddr IN_ADDR
	imsf_interface IN_ADDR
	imsf_fmode int32
	imsf_numsrc uint32
	imsf_slist [1]IN_ADDR
}

type
  IN_ADDR = record
    S_un: _S_un_e__Union;
  end;

  IP_MSFILTER = record
    imsf_multiaddr: IN_ADDR;
    imsf_interface: IN_ADDR;
    imsf_fmode: Integer;
    imsf_numsrc: DWORD;
    imsf_slist: array[0..0] of IN_ADDR;
  end;

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

const IP_MSFILTER = extern struct {
    imsf_multiaddr: IN_ADDR,
    imsf_interface: IN_ADDR,
    imsf_fmode: i32,
    imsf_numsrc: u32,
    imsf_slist: [1]IN_ADDR,
};

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

  IP_MSFILTER {.bycopy.} = object
    imsf_multiaddr: IN_ADDR
    imsf_interface: IN_ADDR
    imsf_fmode: int32
    imsf_numsrc: uint32
    imsf_slist: array[1, IN_ADDR]

struct IN_ADDR
{
    _S_un_e__Union S_un;
}

struct IP_MSFILTER
{
    IN_ADDR imsf_multiaddr;
    IN_ADDR imsf_interface;
    int imsf_fmode;
    uint imsf_numsrc;
    IN_ADDR[1] imsf_slist;
}