ChildWindowFromPointEx

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

HWND ChildWindowFromPointEx(
    HWND hwnd,
    POINT pt,
    CWP_FLAGS flags
);

<DllImport("USER32.dll", ExactSpelling:=True)>
Public Shared Function ChildWindowFromPointEx(
    hwnd As IntPtr,   ' HWND
    pt As POINT,   ' POINT
    flags As UInteger   ' CWP_FLAGS
) As IntPtr
End Function

' hwnd : HWND
' pt : POINT
' flags : CWP_FLAGS
Declare PtrSafe Function ChildWindowFromPointEx Lib "user32" ( _
    ByVal hwnd As LongPtr, _
    ByVal pt As LongPtr, _
    ByVal flags 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

ChildWindowFromPointEx = ctypes.windll.user32.ChildWindowFromPointEx
ChildWindowFromPointEx.restype = ctypes.c_void_p
ChildWindowFromPointEx.argtypes = [
    wintypes.HANDLE,  # hwnd : HWND
    POINT,  # pt : POINT
    wintypes.DWORD,  # flags : CWP_FLAGS
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
ChildWindowFromPointEx = Fiddle::Function.new(
  lib['ChildWindowFromPointEx'],
  [
    Fiddle::TYPE_VOIDP,  # hwnd : HWND
    Fiddle::TYPE_VOIDP,  # pt : POINT
    -Fiddle::TYPE_INT,  # flags : CWP_FLAGS
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "user32")]
extern "system" {
    fn ChildWindowFromPointEx(
        hwnd: *mut core::ffi::c_void,  // HWND
        pt: POINT,  // POINT
        flags: u32  // CWP_FLAGS
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll")]
public static extern IntPtr ChildWindowFromPointEx(IntPtr hwnd, POINT pt, uint flags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_ChildWindowFromPointEx' -Namespace Win32 -PassThru
# $api::ChildWindowFromPointEx(hwnd, pt, flags)

#uselib "USER32.dll"
#func global ChildWindowFromPointEx "ChildWindowFromPointEx" sptr, sptr, sptr
; ChildWindowFromPointEx hwnd, pt, flags   ; 戻り値は stat
; hwnd : HWND -> "sptr"
; pt : POINT -> "sptr"
; flags : CWP_FLAGS -> "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 ChildWindowFromPointEx "ChildWindowFromPointEx" sptr, int, int
; res = ChildWindowFromPointEx(hwnd, pt, flags)
; hwnd : HWND -> "sptr"
; pt : POINT -> "int"
; flags : CWP_FLAGS -> "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 ChildWindowFromPointEx(HWND hwnd, POINT pt, CWP_FLAGS flags)
#uselib "USER32.dll"
#cfunc global ChildWindowFromPointEx "ChildWindowFromPointEx" intptr, int, int
; res = ChildWindowFromPointEx(hwnd, pt, flags)
; hwnd : HWND -> "intptr"
; pt : POINT -> "int"
; flags : CWP_FLAGS -> "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")
	procChildWindowFromPointEx = user32.NewProc("ChildWindowFromPointEx")
)

// hwnd (HWND), pt (POINT), flags (CWP_FLAGS)
r1, _, err := procChildWindowFromPointEx.Call(
	uintptr(hwnd),
	uintptr(pt),
	uintptr(flags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HWND

function ChildWindowFromPointEx(
  hwnd: THandle;   // HWND
  pt: POINT;   // POINT
  flags: DWORD   // CWP_FLAGS
): THandle; stdcall;
  external 'USER32.dll' name 'ChildWindowFromPointEx';

result := DllCall("USER32\ChildWindowFromPointEx"
    , "Ptr", hwnd   ; HWND
    , "Ptr", pt   ; POINT
    , "UInt", flags   ; CWP_FLAGS
    , "Ptr")   ; return: HWND

●ChildWindowFromPointEx(hwnd, pt, flags) = DLL("USER32.dll", "void* ChildWindowFromPointEx(void*, void*, dword)")
# 呼び出し: ChildWindowFromPointEx(hwnd, pt, flags)
# hwnd : HWND -> "void*"
# pt : POINT -> "void*"
# flags : CWP_FLAGS -> "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)。