CreateWindowExA

// USER32.dll  (ANSI / -A)
#include <windows.h>

HWND CreateWindowExA(
    WINDOW_EX_STYLE dwExStyle,
    LPCSTR lpClassName,   // optional
    LPCSTR lpWindowName,   // optional
    WINDOW_STYLE dwStyle,
    INT X,
    INT Y,
    INT nWidth,
    INT nHeight,
    HWND hWndParent,   // optional
    HMENU hMenu,   // optional
    HINSTANCE hInstance,   // optional
    void* lpParam   // optional
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CreateWindowExA(
    dwExStyle As UInteger,   ' WINDOW_EX_STYLE
    <MarshalAs(UnmanagedType.LPStr)> lpClassName As String,   ' LPCSTR optional
    <MarshalAs(UnmanagedType.LPStr)> lpWindowName As String,   ' LPCSTR optional
    dwStyle As UInteger,   ' WINDOW_STYLE
    X As Integer,   ' INT
    Y As Integer,   ' INT
    nWidth As Integer,   ' INT
    nHeight As Integer,   ' INT
    hWndParent As IntPtr,   ' HWND optional
    hMenu As IntPtr,   ' HMENU optional
    hInstance As IntPtr,   ' HINSTANCE optional
    lpParam As IntPtr   ' void* optional
) As IntPtr
End Function

' dwExStyle : WINDOW_EX_STYLE
' lpClassName : LPCSTR optional
' lpWindowName : LPCSTR optional
' dwStyle : WINDOW_STYLE
' X : INT
' Y : INT
' nWidth : INT
' nHeight : INT
' hWndParent : HWND optional
' hMenu : HMENU optional
' hInstance : HINSTANCE optional
' lpParam : void* optional
Declare PtrSafe Function CreateWindowExA Lib "user32" ( _
    ByVal dwExStyle As Long, _
    ByVal lpClassName As String, _
    ByVal lpWindowName As String, _
    ByVal dwStyle As Long, _
    ByVal X As Long, _
    ByVal Y As Long, _
    ByVal nWidth As Long, _
    ByVal nHeight As Long, _
    ByVal hWndParent As LongPtr, _
    ByVal hMenu As LongPtr, _
    ByVal hInstance As LongPtr, _
    ByVal lpParam As LongPtr) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CreateWindowExA = ctypes.windll.user32.CreateWindowExA
CreateWindowExA.restype = ctypes.c_void_p
CreateWindowExA.argtypes = [
    wintypes.DWORD,  # dwExStyle : WINDOW_EX_STYLE
    wintypes.LPCSTR,  # lpClassName : LPCSTR optional
    wintypes.LPCSTR,  # lpWindowName : LPCSTR optional
    wintypes.DWORD,  # dwStyle : WINDOW_STYLE
    ctypes.c_int,  # X : INT
    ctypes.c_int,  # Y : INT
    ctypes.c_int,  # nWidth : INT
    ctypes.c_int,  # nHeight : INT
    wintypes.HANDLE,  # hWndParent : HWND optional
    wintypes.HANDLE,  # hMenu : HMENU optional
    wintypes.HANDLE,  # hInstance : HINSTANCE optional
    ctypes.POINTER(None),  # lpParam : void* optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
CreateWindowExA = Fiddle::Function.new(
  lib['CreateWindowExA'],
  [
    -Fiddle::TYPE_INT,  # dwExStyle : WINDOW_EX_STYLE
    Fiddle::TYPE_VOIDP,  # lpClassName : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # lpWindowName : LPCSTR optional
    -Fiddle::TYPE_INT,  # dwStyle : WINDOW_STYLE
    Fiddle::TYPE_INT,  # X : INT
    Fiddle::TYPE_INT,  # Y : INT
    Fiddle::TYPE_INT,  # nWidth : INT
    Fiddle::TYPE_INT,  # nHeight : INT
    Fiddle::TYPE_VOIDP,  # hWndParent : HWND optional
    Fiddle::TYPE_VOIDP,  # hMenu : HMENU optional
    Fiddle::TYPE_VOIDP,  # hInstance : HINSTANCE optional
    Fiddle::TYPE_VOIDP,  # lpParam : void* optional
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "user32")]
extern "system" {
    fn CreateWindowExA(
        dwExStyle: u32,  // WINDOW_EX_STYLE
        lpClassName: *const u8,  // LPCSTR optional
        lpWindowName: *const u8,  // LPCSTR optional
        dwStyle: u32,  // WINDOW_STYLE
        X: i32,  // INT
        Y: i32,  // INT
        nWidth: i32,  // INT
        nHeight: i32,  // INT
        hWndParent: *mut core::ffi::c_void,  // HWND optional
        hMenu: *mut core::ffi::c_void,  // HMENU optional
        hInstance: *mut core::ffi::c_void,  // HINSTANCE optional
        lpParam: *mut ()  // void* optional
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern IntPtr CreateWindowExA(uint dwExStyle, [MarshalAs(UnmanagedType.LPStr)] string lpClassName, [MarshalAs(UnmanagedType.LPStr)] string lpWindowName, uint dwStyle, int X, int Y, int nWidth, int nHeight, IntPtr hWndParent, IntPtr hMenu, IntPtr hInstance, IntPtr lpParam);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_CreateWindowExA' -Namespace Win32 -PassThru
# $api::CreateWindowExA(dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam)

#uselib "USER32.dll"
#func global CreateWindowExA "CreateWindowExA" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; CreateWindowExA dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam   ; 戻り値は stat
; dwExStyle : WINDOW_EX_STYLE -> "sptr"
; lpClassName : LPCSTR optional -> "sptr"
; lpWindowName : LPCSTR optional -> "sptr"
; dwStyle : WINDOW_STYLE -> "sptr"
; X : INT -> "sptr"
; Y : INT -> "sptr"
; nWidth : INT -> "sptr"
; nHeight : INT -> "sptr"
; hWndParent : HWND optional -> "sptr"
; hMenu : HMENU optional -> "sptr"
; hInstance : HINSTANCE optional -> "sptr"
; lpParam : void* optional -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "USER32.dll"
#cfunc global CreateWindowExA "CreateWindowExA" int, str, str, int, int, int, int, int, sptr, sptr, sptr, sptr
; res = CreateWindowExA(dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam)
; dwExStyle : WINDOW_EX_STYLE -> "int"
; lpClassName : LPCSTR optional -> "str"
; lpWindowName : LPCSTR optional -> "str"
; dwStyle : WINDOW_STYLE -> "int"
; X : INT -> "int"
; Y : INT -> "int"
; nWidth : INT -> "int"
; nHeight : INT -> "int"
; hWndParent : HWND optional -> "sptr"
; hMenu : HMENU optional -> "sptr"
; hInstance : HINSTANCE optional -> "sptr"
; lpParam : void* optional -> "sptr"

; HWND CreateWindowExA(WINDOW_EX_STYLE dwExStyle, LPCSTR lpClassName, LPCSTR lpWindowName, WINDOW_STYLE dwStyle, INT X, INT Y, INT nWidth, INT nHeight, HWND hWndParent, HMENU hMenu, HINSTANCE hInstance, void* lpParam)
#uselib "USER32.dll"
#cfunc global CreateWindowExA "CreateWindowExA" int, str, str, int, int, int, int, int, intptr, intptr, intptr, intptr
; res = CreateWindowExA(dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam)
; dwExStyle : WINDOW_EX_STYLE -> "int"
; lpClassName : LPCSTR optional -> "str"
; lpWindowName : LPCSTR optional -> "str"
; dwStyle : WINDOW_STYLE -> "int"
; X : INT -> "int"
; Y : INT -> "int"
; nWidth : INT -> "int"
; nHeight : INT -> "int"
; hWndParent : HWND optional -> "intptr"
; hMenu : HMENU optional -> "intptr"
; hInstance : HINSTANCE optional -> "intptr"
; lpParam : void* optional -> "intptr"

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procCreateWindowExA = user32.NewProc("CreateWindowExA")
)

// dwExStyle (WINDOW_EX_STYLE), lpClassName (LPCSTR optional), lpWindowName (LPCSTR optional), dwStyle (WINDOW_STYLE), X (INT), Y (INT), nWidth (INT), nHeight (INT), hWndParent (HWND optional), hMenu (HMENU optional), hInstance (HINSTANCE optional), lpParam (void* optional)
r1, _, err := procCreateWindowExA.Call(
	uintptr(dwExStyle),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpClassName))),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpWindowName))),
	uintptr(dwStyle),
	uintptr(X),
	uintptr(Y),
	uintptr(nWidth),
	uintptr(nHeight),
	uintptr(hWndParent),
	uintptr(hMenu),
	uintptr(hInstance),
	uintptr(lpParam),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HWND

function CreateWindowExA(
  dwExStyle: DWORD;   // WINDOW_EX_STYLE
  lpClassName: PAnsiChar;   // LPCSTR optional
  lpWindowName: PAnsiChar;   // LPCSTR optional
  dwStyle: DWORD;   // WINDOW_STYLE
  X: Integer;   // INT
  Y: Integer;   // INT
  nWidth: Integer;   // INT
  nHeight: Integer;   // INT
  hWndParent: THandle;   // HWND optional
  hMenu: THandle;   // HMENU optional
  hInstance: THandle;   // HINSTANCE optional
  lpParam: Pointer   // void* optional
): THandle; stdcall;
  external 'USER32.dll' name 'CreateWindowExA';

result := DllCall("USER32\CreateWindowExA"
    , "UInt", dwExStyle   ; WINDOW_EX_STYLE
    , "AStr", lpClassName   ; LPCSTR optional
    , "AStr", lpWindowName   ; LPCSTR optional
    , "UInt", dwStyle   ; WINDOW_STYLE
    , "Int", X   ; INT
    , "Int", Y   ; INT
    , "Int", nWidth   ; INT
    , "Int", nHeight   ; INT
    , "Ptr", hWndParent   ; HWND optional
    , "Ptr", hMenu   ; HMENU optional
    , "Ptr", hInstance   ; HINSTANCE optional
    , "Ptr", lpParam   ; void* optional
    , "Ptr")   ; return: HWND

●CreateWindowExA(dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam) = DLL("USER32.dll", "void* CreateWindowExA(dword, char*, char*, dword, int, int, int, int, void*, void*, void*, void*)")
# 呼び出し: CreateWindowExA(dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam)
# dwExStyle : WINDOW_EX_STYLE -> "dword"
# lpClassName : LPCSTR optional -> "char*"
# lpWindowName : LPCSTR optional -> "char*"
# dwStyle : WINDOW_STYLE -> "dword"
# X : INT -> "int"
# Y : INT -> "int"
# nWidth : INT -> "int"
# nHeight : INT -> "int"
# hWndParent : HWND optional -> "void*"
# hMenu : HMENU optional -> "void*"
# hInstance : HINSTANCE optional -> "void*"
# lpParam : void* optional -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。

const std = @import("std");

extern "user32" fn CreateWindowExA(
    dwExStyle: u32, // WINDOW_EX_STYLE
    lpClassName: [*c]const u8, // LPCSTR optional
    lpWindowName: [*c]const u8, // LPCSTR optional
    dwStyle: u32, // WINDOW_STYLE
    X: i32, // INT
    Y: i32, // INT
    nWidth: i32, // INT
    nHeight: i32, // INT
    hWndParent: ?*anyopaque, // HWND optional
    hMenu: ?*anyopaque, // HMENU optional
    hInstance: ?*anyopaque, // HINSTANCE optional
    lpParam: ?*anyopaque // void* optional
) callconv(std.os.windows.WINAPI) ?*anyopaque;

proc CreateWindowExA(
    dwExStyle: uint32,  # WINDOW_EX_STYLE
    lpClassName: cstring,  # LPCSTR optional
    lpWindowName: cstring,  # LPCSTR optional
    dwStyle: uint32,  # WINDOW_STYLE
    X: int32,  # INT
    Y: int32,  # INT
    nWidth: int32,  # INT
    nHeight: int32,  # INT
    hWndParent: pointer,  # HWND optional
    hMenu: pointer,  # HMENU optional
    hInstance: pointer,  # HINSTANCE optional
    lpParam: pointer  # void* optional
): pointer {.importc: "CreateWindowExA", stdcall, dynlib: "USER32.dll".}

pragma(lib, "user32");
extern(Windows)
void* CreateWindowExA(
    uint dwExStyle,   // WINDOW_EX_STYLE
    const(char)* lpClassName,   // LPCSTR optional
    const(char)* lpWindowName,   // LPCSTR optional
    uint dwStyle,   // WINDOW_STYLE
    int X,   // INT
    int Y,   // INT
    int nWidth,   // INT
    int nHeight,   // INT
    void* hWndParent,   // HWND optional
    void* hMenu,   // HMENU optional
    void* hInstance,   // HINSTANCE optional
    void* lpParam   // void* optional
);

ccall((:CreateWindowExA, "USER32.dll"), stdcall, Ptr{Cvoid},
      (UInt32, Cstring, Cstring, UInt32, Int32, Int32, Int32, Int32, Ptr{Cvoid}, Ptr{Cvoid}, Ptr{Cvoid}, Ptr{Cvoid}),
      dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam)
# dwExStyle : WINDOW_EX_STYLE -> UInt32
# lpClassName : LPCSTR optional -> Cstring
# lpWindowName : LPCSTR optional -> Cstring
# dwStyle : WINDOW_STYLE -> UInt32
# X : INT -> Int32
# Y : INT -> Int32
# nWidth : INT -> Int32
# nHeight : INT -> Int32
# hWndParent : HWND optional -> Ptr{Cvoid}
# hMenu : HMENU optional -> Ptr{Cvoid}
# hInstance : HINSTANCE optional -> Ptr{Cvoid}
# lpParam : void* optional -> Ptr{Cvoid}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
void* CreateWindowExA(
    uint32_t dwExStyle,
    const char* lpClassName,
    const char* lpWindowName,
    uint32_t dwStyle,
    int32_t X,
    int32_t Y,
    int32_t nWidth,
    int32_t nHeight,
    void* hWndParent,
    void* hMenu,
    void* hInstance,
    void* lpParam);
]]
local user32 = ffi.load("user32")
-- user32.CreateWindowExA(dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam)
-- dwExStyle : WINDOW_EX_STYLE
-- lpClassName : LPCSTR optional
-- lpWindowName : LPCSTR optional
-- dwStyle : WINDOW_STYLE
-- X : INT
-- Y : INT
-- nWidth : INT
-- nHeight : INT
-- hWndParent : HWND optional
-- hMenu : HMENU optional
-- hInstance : HINSTANCE optional
-- lpParam : void* optional
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('USER32.dll');
const CreateWindowExA = lib.func('__stdcall', 'CreateWindowExA', 'void *', ['uint32_t', 'str', 'str', 'uint32_t', 'int32_t', 'int32_t', 'int32_t', 'int32_t', 'void *', 'void *', 'void *', 'void *']);
// CreateWindowExA(dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam)
// dwExStyle : WINDOW_EX_STYLE -> 'uint32_t'
// lpClassName : LPCSTR optional -> 'str'
// lpWindowName : LPCSTR optional -> 'str'
// dwStyle : WINDOW_STYLE -> 'uint32_t'
// X : INT -> 'int32_t'
// Y : INT -> 'int32_t'
// nWidth : INT -> 'int32_t'
// nHeight : INT -> 'int32_t'
// hWndParent : HWND optional -> 'void *'
// hMenu : HMENU optional -> 'void *'
// hInstance : HINSTANCE optional -> 'void *'
// lpParam : void* optional -> 'void *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("USER32.dll", {
  CreateWindowExA: { parameters: ["u32", "buffer", "buffer", "u32", "i32", "i32", "i32", "i32", "pointer", "pointer", "pointer", "pointer"], result: "pointer" },
});
// lib.symbols.CreateWindowExA(dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam)
// dwExStyle : WINDOW_EX_STYLE -> "u32"
// lpClassName : LPCSTR optional -> "buffer"
// lpWindowName : LPCSTR optional -> "buffer"
// dwStyle : WINDOW_STYLE -> "u32"
// X : INT -> "i32"
// Y : INT -> "i32"
// nWidth : INT -> "i32"
// nHeight : INT -> "i32"
// hWndParent : HWND optional -> "pointer"
// hMenu : HMENU optional -> "pointer"
// hInstance : HINSTANCE optional -> "pointer"
// lpParam : void* optional -> "pointer"
// 文字列は "buffer"。ANSI(-A) は new TextEncoder() で UTF-8/ANSI バイト列(末尾に \x00)を渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
void* CreateWindowExA(
    uint32_t dwExStyle,
    const char* lpClassName,
    const char* lpWindowName,
    uint32_t dwStyle,
    int32_t X,
    int32_t Y,
    int32_t nWidth,
    int32_t nHeight,
    void* hWndParent,
    void* hMenu,
    void* hInstance,
    void* lpParam);
C, "USER32.dll");
// $ffi->CreateWindowExA(dwExStyle, lpClassName, lpWindowName, dwStyle, X, Y, nWidth, nHeight, hWndParent, hMenu, hInstance, lpParam);
// dwExStyle : WINDOW_EX_STYLE
// lpClassName : LPCSTR optional
// lpWindowName : LPCSTR optional
// dwStyle : WINDOW_STYLE
// X : INT
// Y : INT
// nWidth : INT
// nHeight : INT
// hWndParent : HWND optional
// hMenu : HMENU optional
// hInstance : HINSTANCE optional
// lpParam : void* optional
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface User32 extends StdCallLibrary {
    User32 INSTANCE = Native.load("user32", User32.class, W32APIOptions.ASCII_OPTIONS);
    Pointer CreateWindowExA(
        int dwExStyle,   // WINDOW_EX_STYLE
        String lpClassName,   // LPCSTR optional
        String lpWindowName,   // LPCSTR optional
        int dwStyle,   // WINDOW_STYLE
        int X,   // INT
        int Y,   // INT
        int nWidth,   // INT
        int nHeight,   // INT
        Pointer hWndParent,   // HWND optional
        Pointer hMenu,   // HMENU optional
        Pointer hInstance,   // HINSTANCE optional
        Pointer lpParam   // void* optional
    );
}

@[Link("user32")]
lib LibUSER32
  fun CreateWindowExA = CreateWindowExA(
    dwExStyle : UInt32,   # WINDOW_EX_STYLE
    lpClassName : UInt8*,   # LPCSTR optional
    lpWindowName : UInt8*,   # LPCSTR optional
    dwStyle : UInt32,   # WINDOW_STYLE
    X : Int32,   # INT
    Y : Int32,   # INT
    nWidth : Int32,   # INT
    nHeight : Int32,   # INT
    hWndParent : Void*,   # HWND optional
    hMenu : Void*,   # HMENU optional
    hInstance : Void*,   # HINSTANCE optional
    lpParam : Void*   # void* optional
  ) : Void*
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef CreateWindowExANative = Pointer<Void> Function(Uint32, Pointer<Utf8>, Pointer<Utf8>, Uint32, Int32, Int32, Int32, Int32, Pointer<Void>, Pointer<Void>, Pointer<Void>, Pointer<Void>);
typedef CreateWindowExADart = Pointer<Void> Function(int, Pointer<Utf8>, Pointer<Utf8>, int, int, int, int, int, Pointer<Void>, Pointer<Void>, Pointer<Void>, Pointer<Void>);
final CreateWindowExA = DynamicLibrary.open('USER32.dll')
    .lookupFunction<CreateWindowExANative, CreateWindowExADart>('CreateWindowExA');
// dwExStyle : WINDOW_EX_STYLE -> Uint32
// lpClassName : LPCSTR optional -> Pointer<Utf8>
// lpWindowName : LPCSTR optional -> Pointer<Utf8>
// dwStyle : WINDOW_STYLE -> Uint32
// X : INT -> Int32
// Y : INT -> Int32
// nWidth : INT -> Int32
// nHeight : INT -> Int32
// hWndParent : HWND optional -> Pointer<Void>
// hMenu : HMENU optional -> Pointer<Void>
// hInstance : HINSTANCE optional -> Pointer<Void>
// lpParam : void* optional -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function CreateWindowExA(
  dwExStyle: DWORD;   // WINDOW_EX_STYLE
  lpClassName: PAnsiChar;   // LPCSTR optional
  lpWindowName: PAnsiChar;   // LPCSTR optional
  dwStyle: DWORD;   // WINDOW_STYLE
  X: Integer;   // INT
  Y: Integer;   // INT
  nWidth: Integer;   // INT
  nHeight: Integer;   // INT
  hWndParent: THandle;   // HWND optional
  hMenu: THandle;   // HMENU optional
  hInstance: THandle;   // HINSTANCE optional
  lpParam: Pointer   // void* optional
): THandle; stdcall;
  external 'USER32.dll' name 'CreateWindowExA';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "CreateWindowExA"
  c_CreateWindowExA :: Word32 -> CString -> CString -> Word32 -> Int32 -> Int32 -> Int32 -> Int32 -> Ptr () -> Ptr () -> Ptr () -> Ptr () -> IO (Ptr ())
-- dwExStyle : WINDOW_EX_STYLE -> Word32
-- lpClassName : LPCSTR optional -> CString
-- lpWindowName : LPCSTR optional -> CString
-- dwStyle : WINDOW_STYLE -> Word32
-- X : INT -> Int32
-- Y : INT -> Int32
-- nWidth : INT -> Int32
-- nHeight : INT -> Int32
-- hWndParent : HWND optional -> Ptr ()
-- hMenu : HMENU optional -> Ptr ()
-- hInstance : HINSTANCE optional -> Ptr ()
-- lpParam : void* optional -> Ptr ()
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let createwindowexa =
  foreign "CreateWindowExA"
    (uint32_t @-> string @-> string @-> uint32_t @-> int32_t @-> int32_t @-> int32_t @-> int32_t @-> (ptr void) @-> (ptr void) @-> (ptr void) @-> (ptr void) @-> returning (ptr void))
(* dwExStyle : WINDOW_EX_STYLE -> uint32_t *)
(* lpClassName : LPCSTR optional -> string *)
(* lpWindowName : LPCSTR optional -> string *)
(* dwStyle : WINDOW_STYLE -> uint32_t *)
(* X : INT -> int32_t *)
(* Y : INT -> int32_t *)
(* nWidth : INT -> int32_t *)
(* nHeight : INT -> int32_t *)
(* hWndParent : HWND optional -> (ptr void) *)
(* hMenu : HMENU optional -> (ptr void) *)
(* hInstance : HINSTANCE optional -> (ptr void) *)
(* lpParam : void* optional -> (ptr void) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library user32 (t "USER32.dll"))
(cffi:use-foreign-library user32)

(cffi:defcfun ("CreateWindowExA" create-window-ex-a :convention :stdcall) :pointer
  (dw-ex-style :uint32)   ; WINDOW_EX_STYLE
  (lp-class-name :string)   ; LPCSTR optional
  (lp-window-name :string)   ; LPCSTR optional
  (dw-style :uint32)   ; WINDOW_STYLE
  (x :int32)   ; INT
  (y :int32)   ; INT
  (n-width :int32)   ; INT
  (n-height :int32)   ; INT
  (h-wnd-parent :pointer)   ; HWND optional
  (h-menu :pointer)   ; HMENU optional
  (h-instance :pointer)   ; HINSTANCE optional
  (lp-param :pointer))   ; void* optional
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $CreateWindowExA = Win32::API::More->new('USER32',
    'HANDLE CreateWindowExA(DWORD dwExStyle, LPCSTR lpClassName, LPCSTR lpWindowName, DWORD dwStyle, int X, int Y, int nWidth, int nHeight, HANDLE hWndParent, HANDLE hMenu, HANDLE hInstance, LPVOID lpParam)');
# my $ret = $CreateWindowExA->Call($dwExStyle, $lpClassName, $lpWindowName, $dwStyle, $X, $Y, $nWidth, $nHeight, $hWndParent, $hMenu, $hInstance, $lpParam);
# dwExStyle : WINDOW_EX_STYLE -> DWORD
# lpClassName : LPCSTR optional -> LPCSTR
# lpWindowName : LPCSTR optional -> LPCSTR
# dwStyle : WINDOW_STYLE -> DWORD
# X : INT -> int
# Y : INT -> int
# nWidth : INT -> int
# nHeight : INT -> int
# hWndParent : HWND optional -> HANDLE
# hMenu : HMENU optional -> HANDLE
# hInstance : HINSTANCE optional -> HANDLE
# lpParam : void* optional -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。