RealChildWindowFromPoint

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

HWND RealChildWindowFromPoint(
    HWND hwndParent,
    POINT ptParentClientCoords
);

<DllImport("USER32.dll", ExactSpelling:=True)>
Public Shared Function RealChildWindowFromPoint(
    hwndParent As IntPtr,   ' HWND
    ptParentClientCoords As POINT   ' POINT
) As IntPtr
End Function

' hwndParent : HWND
' ptParentClientCoords : POINT
Declare PtrSafe Function RealChildWindowFromPoint Lib "user32" ( _
    ByVal hwndParent As LongPtr, _
    ByVal ptParentClientCoords 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

RealChildWindowFromPoint = ctypes.windll.user32.RealChildWindowFromPoint
RealChildWindowFromPoint.restype = ctypes.c_void_p
RealChildWindowFromPoint.argtypes = [
    wintypes.HANDLE,  # hwndParent : HWND
    POINT,  # ptParentClientCoords : POINT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
RealChildWindowFromPoint = Fiddle::Function.new(
  lib['RealChildWindowFromPoint'],
  [
    Fiddle::TYPE_VOIDP,  # hwndParent : HWND
    Fiddle::TYPE_VOIDP,  # ptParentClientCoords : POINT
  ],
  Fiddle::TYPE_VOIDP)

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

$sig = @"
[DllImport("USER32.dll")]
public static extern IntPtr RealChildWindowFromPoint(IntPtr hwndParent, POINT ptParentClientCoords);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_RealChildWindowFromPoint' -Namespace Win32 -PassThru
# $api::RealChildWindowFromPoint(hwndParent, ptParentClientCoords)

#uselib "USER32.dll"
#func global RealChildWindowFromPoint "RealChildWindowFromPoint" sptr, sptr
; RealChildWindowFromPoint hwndParent, ptParentClientCoords   ; 戻り値は stat
; hwndParent : HWND -> "sptr"
; ptParentClientCoords : POINT -> "sptr"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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 RealChildWindowFromPoint "RealChildWindowFromPoint" sptr, int
; res = RealChildWindowFromPoint(hwndParent, ptParentClientCoords)
; hwndParent : HWND -> "sptr"
; ptParentClientCoords : POINT -> "int"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。

; HWND RealChildWindowFromPoint(HWND hwndParent, POINT ptParentClientCoords)
#uselib "USER32.dll"
#cfunc global RealChildWindowFromPoint "RealChildWindowFromPoint" intptr, int
; res = RealChildWindowFromPoint(hwndParent, ptParentClientCoords)
; hwndParent : HWND -> "intptr"
; ptParentClientCoords : POINT -> "int"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procRealChildWindowFromPoint = user32.NewProc("RealChildWindowFromPoint")
)

// hwndParent (HWND), ptParentClientCoords (POINT)
r1, _, err := procRealChildWindowFromPoint.Call(
	uintptr(hwndParent),
	uintptr(ptParentClientCoords),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HWND

function RealChildWindowFromPoint(
  hwndParent: THandle;   // HWND
  ptParentClientCoords: POINT   // POINT
): THandle; stdcall;
  external 'USER32.dll' name 'RealChildWindowFromPoint';

result := DllCall("USER32\RealChildWindowFromPoint"
    , "Ptr", hwndParent   ; HWND
    , "Ptr", ptParentClientCoords   ; POINT
    , "Ptr")   ; return: HWND

●RealChildWindowFromPoint(hwndParent, ptParentClientCoords) = DLL("USER32.dll", "void* RealChildWindowFromPoint(void*, void*)")
# 呼び出し: RealChildWindowFromPoint(hwndParent, ptParentClientCoords)
# hwndParent : HWND -> "void*"
# ptParentClientCoords : POINT -> "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 RealChildWindowFromPoint(
    hwndParent: ?*anyopaque, // HWND
    ptParentClientCoords: POINT // POINT
) callconv(std.os.windows.WINAPI) ?*anyopaque;

proc RealChildWindowFromPoint(
    hwndParent: pointer,  # HWND
    ptParentClientCoords: POINT  # POINT
): pointer {.importc: "RealChildWindowFromPoint", stdcall, dynlib: "USER32.dll".}

pragma(lib, "user32");
extern(Windows)
void* RealChildWindowFromPoint(
    void* hwndParent,   // HWND
    POINT ptParentClientCoords   // POINT
);

ccall((:RealChildWindowFromPoint, "USER32.dll"), stdcall, Ptr{Cvoid},
      (Ptr{Cvoid}, POINT),
      hwndParent, ptParentClientCoords)
# hwndParent : HWND -> Ptr{Cvoid}
# ptParentClientCoords : POINT -> POINT
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
void* RealChildWindowFromPoint(
    void* hwndParent,
    POINT ptParentClientCoords);
]]
local user32 = ffi.load("user32")
-- user32.RealChildWindowFromPoint(hwndParent, ptParentClientCoords)
-- hwndParent : HWND
-- ptParentClientCoords : POINT
-- 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 RealChildWindowFromPoint = lib.func('__stdcall', 'RealChildWindowFromPoint', 'void *', ['void *', 'POINT']);
// RealChildWindowFromPoint(hwndParent, ptParentClientCoords)
// hwndParent : HWND -> 'void *'
// ptParentClientCoords : POINT -> 'POINT'
// 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", {
  RealChildWindowFromPoint: { parameters: ["pointer", "buffer"], result: "pointer" },
});
// lib.symbols.RealChildWindowFromPoint(hwndParent, ptParentClientCoords)
// hwndParent : HWND -> "pointer"
// ptParentClientCoords : POINT -> "buffer"
// 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* RealChildWindowFromPoint(
    void* hwndParent,
    POINT ptParentClientCoords);
C, "USER32.dll");
// $ffi->RealChildWindowFromPoint(hwndParent, ptParentClientCoords);
// hwndParent : HWND
// ptParentClientCoords : POINT
// 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 RealChildWindowFromPoint(
        Pointer hwndParent,   // HWND
        POINT /* extends Structure (by value) */ ptParentClientCoords   // POINT
    );
}

@[Link("user32")]
lib LibUSER32
  fun RealChildWindowFromPoint = RealChildWindowFromPoint(
    hwndParent : Void*,   # HWND
    ptParentClientCoords : POINT   # POINT
  ) : 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 RealChildWindowFromPointNative = Pointer<Void> Function(Pointer<Void>, POINT);
typedef RealChildWindowFromPointDart = Pointer<Void> Function(Pointer<Void>, int);
final RealChildWindowFromPoint = DynamicLibrary.open('USER32.dll')
    .lookupFunction<RealChildWindowFromPointNative, RealChildWindowFromPointDart>('RealChildWindowFromPoint');
// hwndParent : HWND -> Pointer<Void>
// ptParentClientCoords : POINT -> POINT
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function RealChildWindowFromPoint(
  hwndParent: THandle;   // HWND
  ptParentClientCoords: POINT   // POINT
): THandle; stdcall;
  external 'USER32.dll' name 'RealChildWindowFromPoint';

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

foreign import stdcall safe "RealChildWindowFromPoint"
  c_RealChildWindowFromPoint :: Ptr () -> POINT -> IO (Ptr ())
-- hwndParent : HWND -> Ptr ()
-- ptParentClientCoords : POINT -> POINT
-- 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。
-- ※値渡し構造体は GHC FFI で直接渡せません。Ptr で渡すラッパ(C側)経由にしてください。

open Ctypes
open Foreign

let realchildwindowfrompoint =
  foreign "RealChildWindowFromPoint"
    ((ptr void) @-> POINT @-> returning (ptr void))
(* hwndParent : HWND -> (ptr void) *)
(* ptParentClientCoords : POINT -> POINT *)
(* 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 ("RealChildWindowFromPoint" real-child-window-from-point :convention :stdcall) :pointer
  (hwnd-parent :pointer)   ; HWND
  (pt-parent-client-coords (:struct point)))   ; POINT
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

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