GetWindow

// USER32.dll
#include <windows.h>

HWND GetWindow(
    HWND hWnd,
    GET_WINDOW_CMD uCmd
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetWindow(
    hWnd As IntPtr,   ' HWND
    uCmd As UInteger   ' GET_WINDOW_CMD
) As IntPtr
End Function

' hWnd : HWND
' uCmd : GET_WINDOW_CMD
Declare PtrSafe Function GetWindow Lib "user32" ( _
    ByVal hWnd As LongPtr, _
    ByVal uCmd As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetWindow = ctypes.windll.user32.GetWindow
GetWindow.restype = ctypes.c_void_p
GetWindow.argtypes = [
    wintypes.HANDLE,  # hWnd : HWND
    wintypes.DWORD,  # uCmd : GET_WINDOW_CMD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetWindow = Fiddle::Function.new(
  lib['GetWindow'],
  [
    Fiddle::TYPE_VOIDP,  # hWnd : HWND
    -Fiddle::TYPE_INT,  # uCmd : GET_WINDOW_CMD
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "user32")]
extern "system" {
    fn GetWindow(
        hWnd: *mut core::ffi::c_void,  // HWND
        uCmd: u32  // GET_WINDOW_CMD
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", SetLastError = true)]
public static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetWindow' -Namespace Win32 -PassThru
# $api::GetWindow(hWnd, uCmd)

#uselib "USER32.dll"
#func global GetWindow "GetWindow" sptr, sptr
; GetWindow hWnd, uCmd   ; 戻り値は stat
; hWnd : HWND -> "sptr"
; uCmd : GET_WINDOW_CMD -> "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 GetWindow "GetWindow" sptr, int
; res = GetWindow(hWnd, uCmd)
; hWnd : HWND -> "sptr"
; uCmd : GET_WINDOW_CMD -> "int"

; HWND GetWindow(HWND hWnd, GET_WINDOW_CMD uCmd)
#uselib "USER32.dll"
#cfunc global GetWindow "GetWindow" intptr, int
; res = GetWindow(hWnd, uCmd)
; hWnd : HWND -> "intptr"
; uCmd : GET_WINDOW_CMD -> "int"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procGetWindow = user32.NewProc("GetWindow")
)

// hWnd (HWND), uCmd (GET_WINDOW_CMD)
r1, _, err := procGetWindow.Call(
	uintptr(hWnd),
	uintptr(uCmd),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HWND

function GetWindow(
  hWnd: THandle;   // HWND
  uCmd: DWORD   // GET_WINDOW_CMD
): THandle; stdcall;
  external 'USER32.dll' name 'GetWindow';

result := DllCall("USER32\GetWindow"
    , "Ptr", hWnd   ; HWND
    , "UInt", uCmd   ; GET_WINDOW_CMD
    , "Ptr")   ; return: HWND

●GetWindow(hWnd, uCmd) = DLL("USER32.dll", "void* GetWindow(void*, dword)")
# 呼び出し: GetWindow(hWnd, uCmd)
# hWnd : HWND -> "void*"
# uCmd : GET_WINDOW_CMD -> "dword"
# 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 GetWindow(
    hWnd: ?*anyopaque, // HWND
    uCmd: u32 // GET_WINDOW_CMD
) callconv(std.os.windows.WINAPI) ?*anyopaque;

proc GetWindow(
    hWnd: pointer,  # HWND
    uCmd: uint32  # GET_WINDOW_CMD
): pointer {.importc: "GetWindow", stdcall, dynlib: "USER32.dll".}

pragma(lib, "user32");
extern(Windows)
void* GetWindow(
    void* hWnd,   // HWND
    uint uCmd   // GET_WINDOW_CMD
);

ccall((:GetWindow, "USER32.dll"), stdcall, Ptr{Cvoid},
      (Ptr{Cvoid}, UInt32),
      hWnd, uCmd)
# hWnd : HWND -> Ptr{Cvoid}
# uCmd : GET_WINDOW_CMD -> UInt32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
void* GetWindow(
    void* hWnd,
    uint32_t uCmd);
]]
local user32 = ffi.load("user32")
-- user32.GetWindow(hWnd, uCmd)
-- hWnd : HWND
-- uCmd : GET_WINDOW_CMD
-- 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 GetWindow = lib.func('__stdcall', 'GetWindow', 'void *', ['void *', 'uint32_t']);
// GetWindow(hWnd, uCmd)
// hWnd : HWND -> 'void *'
// uCmd : GET_WINDOW_CMD -> 'uint32_t'
// 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", {
  GetWindow: { parameters: ["pointer", "u32"], result: "pointer" },
});
// lib.symbols.GetWindow(hWnd, uCmd)
// hWnd : HWND -> "pointer"
// uCmd : GET_WINDOW_CMD -> "u32"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
void* GetWindow(
    void* hWnd,
    uint32_t uCmd);
C, "USER32.dll");
// $ffi->GetWindow(hWnd, uCmd);
// hWnd : HWND
// uCmd : GET_WINDOW_CMD
// 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);
    Pointer GetWindow(
        Pointer hWnd,   // HWND
        int uCmd   // GET_WINDOW_CMD
    );
}

@[Link("user32")]
lib LibUSER32
  fun GetWindow = GetWindow(
    hWnd : Void*,   # HWND
    uCmd : UInt32   # GET_WINDOW_CMD
  ) : 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 GetWindowNative = Pointer<Void> Function(Pointer<Void>, Uint32);
typedef GetWindowDart = Pointer<Void> Function(Pointer<Void>, int);
final GetWindow = DynamicLibrary.open('USER32.dll')
    .lookupFunction<GetWindowNative, GetWindowDart>('GetWindow');
// hWnd : HWND -> Pointer<Void>
// uCmd : GET_WINDOW_CMD -> Uint32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GetWindow(
  hWnd: THandle;   // HWND
  uCmd: DWORD   // GET_WINDOW_CMD
): THandle; stdcall;
  external 'USER32.dll' name 'GetWindow';

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

foreign import stdcall safe "GetWindow"
  c_GetWindow :: Ptr () -> Word32 -> IO (Ptr ())
-- hWnd : HWND -> Ptr ()
-- uCmd : GET_WINDOW_CMD -> Word32
-- 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 getwindow =
  foreign "GetWindow"
    ((ptr void) @-> uint32_t @-> returning (ptr void))
(* hWnd : HWND -> (ptr void) *)
(* uCmd : GET_WINDOW_CMD -> uint32_t *)
(* 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 ("GetWindow" get-window :convention :stdcall) :pointer
  (h-wnd :pointer)   ; HWND
  (u-cmd :uint32))   ; GET_WINDOW_CMD
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $GetWindow = Win32::API::More->new('USER32',
    'HANDLE GetWindow(HANDLE hWnd, DWORD uCmd)');
# my $ret = $GetWindow->Call($hWnd, $uCmd);
# hWnd : HWND -> HANDLE
# uCmd : GET_WINDOW_CMD -> DWORD
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。