RegisterScaleChangeNotifications

// api-ms-win-shcore-scaling-l1-1-0.dll
#include <windows.h>

HRESULT RegisterScaleChangeNotifications(
    DISPLAY_DEVICE_TYPE displayDevice,
    HWND hwndNotify,
    DWORD uMsgNotify,
    DWORD* pdwCookie
);

<DllImport("api-ms-win-shcore-scaling-l1-1-0.dll", ExactSpelling:=True)>
Public Shared Function RegisterScaleChangeNotifications(
    displayDevice As Integer,   ' DISPLAY_DEVICE_TYPE
    hwndNotify As IntPtr,   ' HWND
    uMsgNotify As UInteger,   ' DWORD
    <Out> ByRef pdwCookie As UInteger   ' DWORD* out
) As Integer
End Function

' displayDevice : DISPLAY_DEVICE_TYPE
' hwndNotify : HWND
' uMsgNotify : DWORD
' pdwCookie : DWORD* out
Declare PtrSafe Function RegisterScaleChangeNotifications Lib "api-ms-win-shcore-scaling-l1-1-0" ( _
    ByVal displayDevice As Long, _
    ByVal hwndNotify As LongPtr, _
    ByVal uMsgNotify As Long, _
    ByRef pdwCookie As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

RegisterScaleChangeNotifications = ctypes.windll.LoadLibrary("api-ms-win-shcore-scaling-l1-1-0.dll").RegisterScaleChangeNotifications
RegisterScaleChangeNotifications.restype = ctypes.c_int
RegisterScaleChangeNotifications.argtypes = [
    ctypes.c_int,  # displayDevice : DISPLAY_DEVICE_TYPE
    wintypes.HANDLE,  # hwndNotify : HWND
    wintypes.DWORD,  # uMsgNotify : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pdwCookie : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('api-ms-win-shcore-scaling-l1-1-0.dll')
RegisterScaleChangeNotifications = Fiddle::Function.new(
  lib['RegisterScaleChangeNotifications'],
  [
    Fiddle::TYPE_INT,  # displayDevice : DISPLAY_DEVICE_TYPE
    Fiddle::TYPE_VOIDP,  # hwndNotify : HWND
    -Fiddle::TYPE_INT,  # uMsgNotify : DWORD
    Fiddle::TYPE_VOIDP,  # pdwCookie : DWORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "api-ms-win-shcore-scaling-l1-1-0")]
extern "system" {
    fn RegisterScaleChangeNotifications(
        displayDevice: i32,  // DISPLAY_DEVICE_TYPE
        hwndNotify: *mut core::ffi::c_void,  // HWND
        uMsgNotify: u32,  // DWORD
        pdwCookie: *mut u32  // DWORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("api-ms-win-shcore-scaling-l1-1-0.dll")]
public static extern int RegisterScaleChangeNotifications(int displayDevice, IntPtr hwndNotify, uint uMsgNotify, out uint pdwCookie);
"@
$api = Add-Type -MemberDefinition $sig -Name 'api-ms-win-shcore-scaling-l1-1-0_RegisterScaleChangeNotifications' -Namespace Win32 -PassThru
# $api::RegisterScaleChangeNotifications(displayDevice, hwndNotify, uMsgNotify, pdwCookie)

#uselib "api-ms-win-shcore-scaling-l1-1-0.dll"
#func global RegisterScaleChangeNotifications "RegisterScaleChangeNotifications" sptr, sptr, sptr, sptr
; RegisterScaleChangeNotifications displayDevice, hwndNotify, uMsgNotify, varptr(pdwCookie)   ; 戻り値は stat
; displayDevice : DISPLAY_DEVICE_TYPE -> "sptr"
; hwndNotify : HWND -> "sptr"
; uMsgNotify : DWORD -> "sptr"
; pdwCookie : DWORD* out -> "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 "api-ms-win-shcore-scaling-l1-1-0.dll"
#cfunc global RegisterScaleChangeNotifications "RegisterScaleChangeNotifications" int, sptr, int, var
; res = RegisterScaleChangeNotifications(displayDevice, hwndNotify, uMsgNotify, pdwCookie)
; displayDevice : DISPLAY_DEVICE_TYPE -> "int"
; hwndNotify : HWND -> "sptr"
; uMsgNotify : DWORD -> "int"
; pdwCookie : DWORD* out -> "var"
; ※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。

; HRESULT RegisterScaleChangeNotifications(DISPLAY_DEVICE_TYPE displayDevice, HWND hwndNotify, DWORD uMsgNotify, DWORD* pdwCookie)
#uselib "api-ms-win-shcore-scaling-l1-1-0.dll"
#cfunc global RegisterScaleChangeNotifications "RegisterScaleChangeNotifications" int, intptr, int, var
; res = RegisterScaleChangeNotifications(displayDevice, hwndNotify, uMsgNotify, pdwCookie)
; displayDevice : DISPLAY_DEVICE_TYPE -> "int"
; hwndNotify : HWND -> "intptr"
; uMsgNotify : DWORD -> "int"
; pdwCookie : DWORD* out -> "var"
; ※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 (
	api_ms_win_shcore_scaling_l1_1_0 = windows.NewLazySystemDLL("api-ms-win-shcore-scaling-l1-1-0.dll")
	procRegisterScaleChangeNotifications = api_ms_win_shcore_scaling_l1_1_0.NewProc("RegisterScaleChangeNotifications")
)

// displayDevice (DISPLAY_DEVICE_TYPE), hwndNotify (HWND), uMsgNotify (DWORD), pdwCookie (DWORD* out)
r1, _, err := procRegisterScaleChangeNotifications.Call(
	uintptr(displayDevice),
	uintptr(hwndNotify),
	uintptr(uMsgNotify),
	uintptr(pdwCookie),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function RegisterScaleChangeNotifications(
  displayDevice: Integer;   // DISPLAY_DEVICE_TYPE
  hwndNotify: THandle;   // HWND
  uMsgNotify: DWORD;   // DWORD
  pdwCookie: Pointer   // DWORD* out
): Integer; stdcall;
  external 'api-ms-win-shcore-scaling-l1-1-0.dll' name 'RegisterScaleChangeNotifications';

result := DllCall("api-ms-win-shcore-scaling-l1-1-0\RegisterScaleChangeNotifications"
    , "Int", displayDevice   ; DISPLAY_DEVICE_TYPE
    , "Ptr", hwndNotify   ; HWND
    , "UInt", uMsgNotify   ; DWORD
    , "Ptr", pdwCookie   ; DWORD* out
    , "Int")   ; return: HRESULT

●RegisterScaleChangeNotifications(displayDevice, hwndNotify, uMsgNotify, pdwCookie) = DLL("api-ms-win-shcore-scaling-l1-1-0.dll", "int RegisterScaleChangeNotifications(int, void*, dword, void*)")
# 呼び出し: RegisterScaleChangeNotifications(displayDevice, hwndNotify, uMsgNotify, pdwCookie)
# displayDevice : DISPLAY_DEVICE_TYPE -> "int"
# hwndNotify : HWND -> "void*"
# uMsgNotify : DWORD -> "dword"
# pdwCookie : DWORD* out -> "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)。