CascadeWindows

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

WORD CascadeWindows(
    HWND hwndParent,   // optional
    CASCADE_WINDOWS_HOW wHow,
    const RECT* lpRect,   // optional
    DWORD cKids,
    const HWND* lpKids   // optional
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CascadeWindows(
    hwndParent As IntPtr,   ' HWND optional
    wHow As UInteger,   ' CASCADE_WINDOWS_HOW
    lpRect As IntPtr,   ' RECT* optional
    cKids As UInteger,   ' DWORD
    lpKids As IntPtr   ' HWND* optional
) As UShort
End Function

' hwndParent : HWND optional
' wHow : CASCADE_WINDOWS_HOW
' lpRect : RECT* optional
' cKids : DWORD
' lpKids : HWND* optional
Declare PtrSafe Function CascadeWindows Lib "user32" ( _
    ByVal hwndParent As LongPtr, _
    ByVal wHow As Long, _
    ByVal lpRect As LongPtr, _
    ByVal cKids As Long, _
    ByVal lpKids As LongPtr) As Integer
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CascadeWindows = ctypes.windll.user32.CascadeWindows
CascadeWindows.restype = ctypes.c_ushort
CascadeWindows.argtypes = [
    wintypes.HANDLE,  # hwndParent : HWND optional
    wintypes.DWORD,  # wHow : CASCADE_WINDOWS_HOW
    ctypes.c_void_p,  # lpRect : RECT* optional
    wintypes.DWORD,  # cKids : DWORD
    ctypes.c_void_p,  # lpKids : HWND* optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
CascadeWindows = Fiddle::Function.new(
  lib['CascadeWindows'],
  [
    Fiddle::TYPE_VOIDP,  # hwndParent : HWND optional
    -Fiddle::TYPE_INT,  # wHow : CASCADE_WINDOWS_HOW
    Fiddle::TYPE_VOIDP,  # lpRect : RECT* optional
    -Fiddle::TYPE_INT,  # cKids : DWORD
    Fiddle::TYPE_VOIDP,  # lpKids : HWND* optional
  ],
  -Fiddle::TYPE_SHORT)

#[link(name = "user32")]
extern "system" {
    fn CascadeWindows(
        hwndParent: *mut core::ffi::c_void,  // HWND optional
        wHow: u32,  // CASCADE_WINDOWS_HOW
        lpRect: *const RECT,  // RECT* optional
        cKids: u32,  // DWORD
        lpKids: *mut *mut core::ffi::c_void  // HWND* optional
    ) -> u16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", SetLastError = true)]
public static extern ushort CascadeWindows(IntPtr hwndParent, uint wHow, IntPtr lpRect, uint cKids, IntPtr lpKids);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_CascadeWindows' -Namespace Win32 -PassThru
# $api::CascadeWindows(hwndParent, wHow, lpRect, cKids, lpKids)

#uselib "USER32.dll"
#func global CascadeWindows "CascadeWindows" sptr, sptr, sptr, sptr, sptr
; CascadeWindows hwndParent, wHow, varptr(lpRect), cKids, lpKids   ; 戻り値は stat
; hwndParent : HWND optional -> "sptr"
; wHow : CASCADE_WINDOWS_HOW -> "sptr"
; lpRect : RECT* optional -> "sptr"
; cKids : DWORD -> "sptr"
; lpKids : HWND* 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 CascadeWindows "CascadeWindows" sptr, int, var, int, sptr
; res = CascadeWindows(hwndParent, wHow, lpRect, cKids, lpKids)
; hwndParent : HWND optional -> "sptr"
; wHow : CASCADE_WINDOWS_HOW -> "int"
; lpRect : RECT* optional -> "var"
; cKids : DWORD -> "int"
; lpKids : HWND* optional -> "sptr"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; WORD CascadeWindows(HWND hwndParent, CASCADE_WINDOWS_HOW wHow, RECT* lpRect, DWORD cKids, HWND* lpKids)
#uselib "USER32.dll"
#cfunc global CascadeWindows "CascadeWindows" intptr, int, var, int, intptr
; res = CascadeWindows(hwndParent, wHow, lpRect, cKids, lpKids)
; hwndParent : HWND optional -> "intptr"
; wHow : CASCADE_WINDOWS_HOW -> "int"
; lpRect : RECT* optional -> "var"
; cKids : DWORD -> "int"
; lpKids : HWND* optional -> "intptr"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procCascadeWindows = user32.NewProc("CascadeWindows")
)

// hwndParent (HWND optional), wHow (CASCADE_WINDOWS_HOW), lpRect (RECT* optional), cKids (DWORD), lpKids (HWND* optional)
r1, _, err := procCascadeWindows.Call(
	uintptr(hwndParent),
	uintptr(wHow),
	uintptr(lpRect),
	uintptr(cKids),
	uintptr(lpKids),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WORD

function CascadeWindows(
  hwndParent: THandle;   // HWND optional
  wHow: DWORD;   // CASCADE_WINDOWS_HOW
  lpRect: Pointer;   // RECT* optional
  cKids: DWORD;   // DWORD
  lpKids: Pointer   // HWND* optional
): Word; stdcall;
  external 'USER32.dll' name 'CascadeWindows';

result := DllCall("USER32\CascadeWindows"
    , "Ptr", hwndParent   ; HWND optional
    , "UInt", wHow   ; CASCADE_WINDOWS_HOW
    , "Ptr", lpRect   ; RECT* optional
    , "UInt", cKids   ; DWORD
    , "Ptr", lpKids   ; HWND* optional
    , "UShort")   ; return: WORD

●CascadeWindows(hwndParent, wHow, lpRect, cKids, lpKids) = DLL("USER32.dll", "int CascadeWindows(void*, dword, void*, dword, void*)")
# 呼び出し: CascadeWindows(hwndParent, wHow, lpRect, cKids, lpKids)
# hwndParent : HWND optional -> "void*"
# wHow : CASCADE_WINDOWS_HOW -> "dword"
# lpRect : RECT* optional -> "void*"
# cKids : DWORD -> "dword"
# lpKids : HWND* 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)。