ExtKeyDef

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct ExtKeySubst
{
    public ushort wMod;
    public ushort wVirKey;
    public char wUnicodeChar;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct ExtKeyDef
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)] public ExtKeySubst[] keys;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure ExtKeySubst
    Public wMod As UShort
    Public wVirKey As UShort
    Public wUnicodeChar As Char
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure ExtKeyDef
    <MarshalAs(UnmanagedType.ByValArray, SizeConst:=3)> Public keys() As ExtKeySubst
End Structure

import ctypes
from ctypes import wintypes

class ExtKeySubst(ctypes.Structure):
    _fields_ = [
        ("wMod", ctypes.c_ushort),
        ("wVirKey", ctypes.c_ushort),
        ("wUnicodeChar", ctypes.c_wchar),
    ]

class ExtKeyDef(ctypes.Structure):
    _fields_ = [
        ("keys", ExtKeySubst * 3),
    ]

#[repr(C)]
pub struct ExtKeySubst {
    pub wMod: u16,
    pub wVirKey: u16,
    pub wUnicodeChar: u16,
}

#[repr(C)]
pub struct ExtKeyDef {
    pub keys: [ExtKeySubst; 3],
}

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

type ExtKeySubst struct {
	wMod uint16
	wVirKey uint16
	wUnicodeChar uint16
}

type ExtKeyDef struct {
	keys [3]ExtKeySubst
}

type
  ExtKeySubst = record
    wMod: Word;
    wVirKey: Word;
    wUnicodeChar: WideChar;
  end;

  ExtKeyDef = record
    keys: array[0..2] of ExtKeySubst;
  end;

const ExtKeySubst = extern struct {
    wMod: u16,
    wVirKey: u16,
    wUnicodeChar: u16,
};

const ExtKeyDef = extern struct {
    keys: [3]ExtKeySubst,
};

type
  ExtKeySubst {.bycopy.} = object
    wMod: uint16
    wVirKey: uint16
    wUnicodeChar: uint16

  ExtKeyDef {.bycopy.} = object
    keys: array[3, ExtKeySubst]

struct ExtKeySubst
{
    ushort wMod;
    ushort wVirKey;
    wchar wUnicodeChar;
}

struct ExtKeyDef
{
    ExtKeySubst[3] keys;
}