WNDCLASSA

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct WNDCLASSA
{
    public uint style;
    public IntPtr lpfnWndProc;
    public int cbClsExtra;
    public int cbWndExtra;
    public IntPtr hInstance;
    public IntPtr hIcon;
    public IntPtr hCursor;
    public IntPtr hbrBackground;
    public IntPtr lpszMenuName;
    public IntPtr lpszClassName;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure WNDCLASSA
    Public style As UInteger
    Public lpfnWndProc As IntPtr
    Public cbClsExtra As Integer
    Public cbWndExtra As Integer
    Public hInstance As IntPtr
    Public hIcon As IntPtr
    Public hCursor As IntPtr
    Public hbrBackground As IntPtr
    Public lpszMenuName As IntPtr
    Public lpszClassName As IntPtr
End Structure

import ctypes
from ctypes import wintypes

class WNDCLASSA(ctypes.Structure):
    _fields_ = [
        ("style", wintypes.DWORD),
        ("lpfnWndProc", ctypes.c_void_p),
        ("cbClsExtra", ctypes.c_int),
        ("cbWndExtra", ctypes.c_int),
        ("hInstance", ctypes.c_void_p),
        ("hIcon", ctypes.c_void_p),
        ("hCursor", ctypes.c_void_p),
        ("hbrBackground", ctypes.c_void_p),
        ("lpszMenuName", ctypes.c_void_p),
        ("lpszClassName", ctypes.c_void_p),
    ]

#[repr(C)]
pub struct WNDCLASSA {
    pub style: u32,
    pub lpfnWndProc: *mut core::ffi::c_void,
    pub cbClsExtra: i32,
    pub cbWndExtra: i32,
    pub hInstance: *mut core::ffi::c_void,
    pub hIcon: *mut core::ffi::c_void,
    pub hCursor: *mut core::ffi::c_void,
    pub hbrBackground: *mut core::ffi::c_void,
    pub lpszMenuName: *mut core::ffi::c_void,
    pub lpszClassName: *mut core::ffi::c_void,
}

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

type WNDCLASSA struct {
	style uint32
	lpfnWndProc uintptr
	cbClsExtra int32
	cbWndExtra int32
	hInstance uintptr
	hIcon uintptr
	hCursor uintptr
	hbrBackground uintptr
	lpszMenuName uintptr
	lpszClassName uintptr
}

type
  WNDCLASSA = record
    style: DWORD;
    lpfnWndProc: Pointer;
    cbClsExtra: Integer;
    cbWndExtra: Integer;
    hInstance: Pointer;
    hIcon: Pointer;
    hCursor: Pointer;
    hbrBackground: Pointer;
    lpszMenuName: Pointer;
    lpszClassName: Pointer;
  end;

const WNDCLASSA = extern struct {
    style: u32,
    lpfnWndProc: ?*anyopaque,
    cbClsExtra: i32,
    cbWndExtra: i32,
    hInstance: ?*anyopaque,
    hIcon: ?*anyopaque,
    hCursor: ?*anyopaque,
    hbrBackground: ?*anyopaque,
    lpszMenuName: ?*anyopaque,
    lpszClassName: ?*anyopaque,
};

type
  WNDCLASSA {.bycopy.} = object
    style: uint32
    lpfnWndProc: pointer
    cbClsExtra: int32
    cbWndExtra: int32
    hInstance: pointer
    hIcon: pointer
    hCursor: pointer
    hbrBackground: pointer
    lpszMenuName: pointer
    lpszClassName: pointer

struct WNDCLASSA
{
    uint style;
    void* lpfnWndProc;
    int cbClsExtra;
    int cbWndExtra;
    void* hInstance;
    void* hIcon;
    void* hCursor;
    void* hbrBackground;
    void* lpszMenuName;
    void* lpszClassName;
}