MSGFILTER

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct NMHDR
{
    public IntPtr hwndFrom;
    public UIntPtr idFrom;
    public uint code;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct MSGFILTER
{
    public NMHDR nmhdr;
    public uint msg;
    public UIntPtr wParam;
    public IntPtr lParam;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure NMHDR
    Public hwndFrom As IntPtr
    Public idFrom As UIntPtr
    Public code As UInteger
End Structure

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure MSGFILTER
    Public nmhdr As NMHDR
    Public msg As UInteger
    Public wParam As UIntPtr
    Public lParam As IntPtr
End Structure

import ctypes
from ctypes import wintypes

class NMHDR(ctypes.Structure):
    _fields_ = [
        ("hwndFrom", ctypes.c_void_p),
        ("idFrom", ctypes.c_size_t),
        ("code", wintypes.DWORD),
    ]

class MSGFILTER(ctypes.Structure):
    _fields_ = [
        ("nmhdr", NMHDR),
        ("msg", wintypes.DWORD),
        ("wParam", ctypes.c_size_t),
        ("lParam", ctypes.c_ssize_t),
    ]

#[repr(C)]
pub struct NMHDR {
    pub hwndFrom: *mut core::ffi::c_void,
    pub idFrom: usize,
    pub code: u32,
}

#[repr(C)]
pub struct MSGFILTER {
    pub nmhdr: NMHDR,
    pub msg: u32,
    pub wParam: usize,
    pub lParam: isize,
}

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

type NMHDR struct {
	hwndFrom uintptr
	idFrom uintptr
	code uint32
}

type MSGFILTER struct {
	nmhdr NMHDR
	msg uint32
	wParam uintptr
	lParam uintptr
}

type
  NMHDR = record
    hwndFrom: Pointer;
    idFrom: NativeUInt;
    code: DWORD;
  end;

  MSGFILTER = record
    nmhdr: NMHDR;
    msg: DWORD;
    wParam: NativeUInt;
    lParam: NativeInt;
  end;

const NMHDR = extern struct {
    hwndFrom: ?*anyopaque,
    idFrom: usize,
    code: u32,
};

const MSGFILTER = extern struct {
    nmhdr: NMHDR,
    msg: u32,
    wParam: usize,
    lParam: isize,
};

type
  NMHDR {.bycopy.} = object
    hwndFrom: pointer
    idFrom: uint
    code: uint32

  MSGFILTER {.bycopy.} = object
    nmhdr: NMHDR
    msg: uint32
    wParam: uint
    lParam: int

struct NMHDR
{
    void* hwndFrom;
    size_t idFrom;
    uint code;
}

struct MSGFILTER
{
    NMHDR nmhdr;
    uint msg;
    size_t wParam;
    ptrdiff_t lParam;
}