IPV4_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 IPV4_HEADER
{
    public _Anonymous1_e__Union Anonymous1;
    public _Anonymous2_e__Union Anonymous2;
    public ushort TotalLength;
    public ushort Identification;
    public _Anonymous3_e__Union Anonymous3;
    public byte TimeToLive;
    public byte Protocol;
    public ushort HeaderChecksum;
    public IN_ADDR SourceAddress;
    public IN_ADDR DestinationAddress;
}

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 IPV4_HEADER
    Public Anonymous1 As _Anonymous1_e__Union
    Public Anonymous2 As _Anonymous2_e__Union
    Public TotalLength As UShort
    Public Identification As UShort
    Public Anonymous3 As _Anonymous3_e__Union
    Public TimeToLive As Byte
    Public Protocol As Byte
    Public HeaderChecksum As UShort
    Public SourceAddress As IN_ADDR
    Public DestinationAddress As IN_ADDR
End Structure

import ctypes
from ctypes import wintypes

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

class IPV4_HEADER(ctypes.Structure):
    _fields_ = [
        ("Anonymous1", _Anonymous1_e__Union),
        ("Anonymous2", _Anonymous2_e__Union),
        ("TotalLength", ctypes.c_ushort),
        ("Identification", ctypes.c_ushort),
        ("Anonymous3", _Anonymous3_e__Union),
        ("TimeToLive", ctypes.c_ubyte),
        ("Protocol", ctypes.c_ubyte),
        ("HeaderChecksum", ctypes.c_ushort),
        ("SourceAddress", IN_ADDR),
        ("DestinationAddress", IN_ADDR),
    ]

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

#[repr(C)]
pub struct IPV4_HEADER {
    pub Anonymous1: _Anonymous1_e__Union,
    pub Anonymous2: _Anonymous2_e__Union,
    pub TotalLength: u16,
    pub Identification: u16,
    pub Anonymous3: _Anonymous3_e__Union,
    pub TimeToLive: u8,
    pub Protocol: u8,
    pub HeaderChecksum: u16,
    pub SourceAddress: IN_ADDR,
    pub DestinationAddress: IN_ADDR,
}

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

type IN_ADDR struct {
	S_un _S_un_e__Union
}

type IPV4_HEADER struct {
	Anonymous1 _Anonymous1_e__Union
	Anonymous2 _Anonymous2_e__Union
	TotalLength uint16
	Identification uint16
	Anonymous3 _Anonymous3_e__Union
	TimeToLive byte
	Protocol byte
	HeaderChecksum uint16
	SourceAddress IN_ADDR
	DestinationAddress IN_ADDR
}

type
  IN_ADDR = record
    S_un: _S_un_e__Union;
  end;

  IPV4_HEADER = record
    Anonymous1: _Anonymous1_e__Union;
    Anonymous2: _Anonymous2_e__Union;
    TotalLength: Word;
    Identification: Word;
    Anonymous3: _Anonymous3_e__Union;
    TimeToLive: Byte;
    Protocol: Byte;
    HeaderChecksum: Word;
    SourceAddress: IN_ADDR;
    DestinationAddress: IN_ADDR;
  end;

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

const IPV4_HEADER = extern struct {
    Anonymous1: _Anonymous1_e__Union,
    Anonymous2: _Anonymous2_e__Union,
    TotalLength: u16,
    Identification: u16,
    Anonymous3: _Anonymous3_e__Union,
    TimeToLive: u8,
    Protocol: u8,
    HeaderChecksum: u16,
    SourceAddress: IN_ADDR,
    DestinationAddress: IN_ADDR,
};

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

  IPV4_HEADER {.bycopy.} = object
    Anonymous1: _Anonymous1_e__Union
    Anonymous2: _Anonymous2_e__Union
    TotalLength: uint16
    Identification: uint16
    Anonymous3: _Anonymous3_e__Union
    TimeToLive: uint8
    Protocol: uint8
    HeaderChecksum: uint16
    SourceAddress: IN_ADDR
    DestinationAddress: IN_ADDR

struct IN_ADDR
{
    _S_un_e__Union S_un;
}

struct IPV4_HEADER
{
    _Anonymous1_e__Union Anonymous1;
    _Anonymous2_e__Union Anonymous2;
    ushort TotalLength;
    ushort Identification;
    _Anonymous3_e__Union Anonymous3;
    ubyte TimeToLive;
    ubyte Protocol;
    ushort HeaderChecksum;
    IN_ADDR SourceAddress;
    IN_ADDR DestinationAddress;
}