GetScaleFactorForMonitor

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

HRESULT GetScaleFactorForMonitor(
    HMONITOR hMon,
    DEVICE_SCALE_FACTOR* pScale
);

<DllImport("api-ms-win-shcore-scaling-l1-1-1.dll", ExactSpelling:=True)>
Public Shared Function GetScaleFactorForMonitor(
    hMon As IntPtr,   ' HMONITOR
    <Out> ByRef pScale As Integer   ' DEVICE_SCALE_FACTOR* out
) As Integer
End Function

' hMon : HMONITOR
' pScale : DEVICE_SCALE_FACTOR* out
Declare PtrSafe Function GetScaleFactorForMonitor Lib "api-ms-win-shcore-scaling-l1-1-1" ( _
    ByVal hMon As LongPtr, _
    ByRef pScale 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

GetScaleFactorForMonitor = ctypes.windll.LoadLibrary("api-ms-win-shcore-scaling-l1-1-1.dll").GetScaleFactorForMonitor
GetScaleFactorForMonitor.restype = ctypes.c_int
GetScaleFactorForMonitor.argtypes = [
    wintypes.HANDLE,  # hMon : HMONITOR
    ctypes.c_void_p,  # pScale : DEVICE_SCALE_FACTOR* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('api-ms-win-shcore-scaling-l1-1-1.dll')
GetScaleFactorForMonitor = Fiddle::Function.new(
  lib['GetScaleFactorForMonitor'],
  [
    Fiddle::TYPE_VOIDP,  # hMon : HMONITOR
    Fiddle::TYPE_VOIDP,  # pScale : DEVICE_SCALE_FACTOR* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "api-ms-win-shcore-scaling-l1-1-1")]
extern "system" {
    fn GetScaleFactorForMonitor(
        hMon: *mut core::ffi::c_void,  // HMONITOR
        pScale: *mut i32  // DEVICE_SCALE_FACTOR* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("api-ms-win-shcore-scaling-l1-1-1.dll")]
public static extern int GetScaleFactorForMonitor(IntPtr hMon, out int pScale);
"@
$api = Add-Type -MemberDefinition $sig -Name 'api-ms-win-shcore-scaling-l1-1-1_GetScaleFactorForMonitor' -Namespace Win32 -PassThru
# $api::GetScaleFactorForMonitor(hMon, pScale)

#uselib "api-ms-win-shcore-scaling-l1-1-1.dll"
#func global GetScaleFactorForMonitor "GetScaleFactorForMonitor" sptr, sptr
; GetScaleFactorForMonitor hMon, varptr(pScale)   ; 戻り値は stat
; hMon : HMONITOR -> "sptr"
; pScale : DEVICE_SCALE_FACTOR* 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。

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

var (
	api_ms_win_shcore_scaling_l1_1_1 = windows.NewLazySystemDLL("api-ms-win-shcore-scaling-l1-1-1.dll")
	procGetScaleFactorForMonitor = api_ms_win_shcore_scaling_l1_1_1.NewProc("GetScaleFactorForMonitor")
)

// hMon (HMONITOR), pScale (DEVICE_SCALE_FACTOR* out)
r1, _, err := procGetScaleFactorForMonitor.Call(
	uintptr(hMon),
	uintptr(pScale),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function GetScaleFactorForMonitor(
  hMon: THandle;   // HMONITOR
  pScale: Pointer   // DEVICE_SCALE_FACTOR* out
): Integer; stdcall;
  external 'api-ms-win-shcore-scaling-l1-1-1.dll' name 'GetScaleFactorForMonitor';

result := DllCall("api-ms-win-shcore-scaling-l1-1-1\GetScaleFactorForMonitor"
    , "Ptr", hMon   ; HMONITOR
    , "Ptr", pScale   ; DEVICE_SCALE_FACTOR* out
    , "Int")   ; return: HRESULT

●GetScaleFactorForMonitor(hMon, pScale) = DLL("api-ms-win-shcore-scaling-l1-1-1.dll", "int GetScaleFactorForMonitor(void*, void*)")
# 呼び出し: GetScaleFactorForMonitor(hMon, pScale)
# hMon : HMONITOR -> "void*"
# pScale : DEVICE_SCALE_FACTOR* 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)。

const std = @import("std");

extern "api-ms-win-shcore-scaling-l1-1-1" fn GetScaleFactorForMonitor(
    hMon: ?*anyopaque, // HMONITOR
    pScale: [*c]i32 // DEVICE_SCALE_FACTOR* out
) callconv(std.os.windows.WINAPI) i32;

proc GetScaleFactorForMonitor(
    hMon: pointer,  # HMONITOR
    pScale: ptr int32  # DEVICE_SCALE_FACTOR* out
): int32 {.importc: "GetScaleFactorForMonitor", stdcall, dynlib: "api-ms-win-shcore-scaling-l1-1-1.dll".}

pragma(lib, "api-ms-win-shcore-scaling-l1-1-1");
extern(Windows)
int GetScaleFactorForMonitor(
    void* hMon,   // HMONITOR
    int* pScale   // DEVICE_SCALE_FACTOR* out
);

ccall((:GetScaleFactorForMonitor, "api-ms-win-shcore-scaling-l1-1-1.dll"), stdcall, Int32,
      (Ptr{Cvoid}, Ptr{Int32}),
      hMon, pScale)
# hMon : HMONITOR -> Ptr{Cvoid}
# pScale : DEVICE_SCALE_FACTOR* out -> Ptr{Int32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t GetScaleFactorForMonitor(
    void* hMon,
    int32_t* pScale);
]]
local api-ms-win-shcore-scaling-l1-1-1 = ffi.load("api-ms-win-shcore-scaling-l1-1-1")
-- api-ms-win-shcore-scaling-l1-1-1.GetScaleFactorForMonitor(hMon, pScale)
-- hMon : HMONITOR
-- pScale : DEVICE_SCALE_FACTOR* out
-- 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('api-ms-win-shcore-scaling-l1-1-1.dll');
const GetScaleFactorForMonitor = lib.func('__stdcall', 'GetScaleFactorForMonitor', 'int32_t', ['void *', 'int32_t *']);
// GetScaleFactorForMonitor(hMon, pScale)
// hMon : HMONITOR -> 'void *'
// pScale : DEVICE_SCALE_FACTOR* out -> 'int32_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("api-ms-win-shcore-scaling-l1-1-1.dll", {
  GetScaleFactorForMonitor: { parameters: ["pointer", "pointer"], result: "i32" },
});
// lib.symbols.GetScaleFactorForMonitor(hMon, pScale)
// hMon : HMONITOR -> "pointer"
// pScale : DEVICE_SCALE_FACTOR* out -> "pointer"
// 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
int32_t GetScaleFactorForMonitor(
    void* hMon,
    int32_t* pScale);
C, "api-ms-win-shcore-scaling-l1-1-1.dll");
// $ffi->GetScaleFactorForMonitor(hMon, pScale);
// hMon : HMONITOR
// pScale : DEVICE_SCALE_FACTOR* out
// 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 Api-ms-win-shcore-scaling-l1-1-1 extends StdCallLibrary {
    Api-ms-win-shcore-scaling-l1-1-1 INSTANCE = Native.load("api-ms-win-shcore-scaling-l1-1-1", Api-ms-win-shcore-scaling-l1-1-1.class);
    int GetScaleFactorForMonitor(
        Pointer hMon,   // HMONITOR
        IntByReference pScale   // DEVICE_SCALE_FACTOR* out
    );
}

@[Link("api-ms-win-shcore-scaling-l1-1-1")]
lib Libapi-ms-win-shcore-scaling-l1-1-1
  fun GetScaleFactorForMonitor = GetScaleFactorForMonitor(
    hMon : Void*,   # HMONITOR
    pScale : Int32*   # DEVICE_SCALE_FACTOR* out
  ) : Int32
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 GetScaleFactorForMonitorNative = Int32 Function(Pointer<Void>, Pointer<Int32>);
typedef GetScaleFactorForMonitorDart = int Function(Pointer<Void>, Pointer<Int32>);
final GetScaleFactorForMonitor = DynamicLibrary.open('api-ms-win-shcore-scaling-l1-1-1.dll')
    .lookupFunction<GetScaleFactorForMonitorNative, GetScaleFactorForMonitorDart>('GetScaleFactorForMonitor');
// hMon : HMONITOR -> Pointer<Void>
// pScale : DEVICE_SCALE_FACTOR* out -> Pointer<Int32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GetScaleFactorForMonitor(
  hMon: THandle;   // HMONITOR
  pScale: Pointer   // DEVICE_SCALE_FACTOR* out
): Integer; stdcall;
  external 'api-ms-win-shcore-scaling-l1-1-1.dll' name 'GetScaleFactorForMonitor';

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

foreign import stdcall safe "GetScaleFactorForMonitor"
  c_GetScaleFactorForMonitor :: Ptr () -> Ptr Int32 -> IO Int32
-- hMon : HMONITOR -> Ptr ()
-- pScale : DEVICE_SCALE_FACTOR* out -> Ptr Int32
-- 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 getscalefactorformonitor =
  foreign "GetScaleFactorForMonitor"
    ((ptr void) @-> (ptr int32_t) @-> returning int32_t)
(* hMon : HMONITOR -> (ptr void) *)
(* pScale : DEVICE_SCALE_FACTOR* out -> (ptr int32_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 api-ms-win-shcore-scaling-l1-1-1 (t "api-ms-win-shcore-scaling-l1-1-1.dll"))
(cffi:use-foreign-library api-ms-win-shcore-scaling-l1-1-1)

(cffi:defcfun ("GetScaleFactorForMonitor" get-scale-factor-for-monitor :convention :stdcall) :int32
  (h-mon :pointer)   ; HMONITOR
  (p-scale :pointer))   ; DEVICE_SCALE_FACTOR* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $GetScaleFactorForMonitor = Win32::API::More->new('api-ms-win-shcore-scaling-l1-1-1',
    'int GetScaleFactorForMonitor(HANDLE hMon, LPVOID pScale)');
# my $ret = $GetScaleFactorForMonitor->Call($hMon, $pScale);
# hMon : HMONITOR -> HANDLE
# pScale : DEVICE_SCALE_FACTOR* out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。