GetScaleFactorForDevice

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

DEVICE_SCALE_FACTOR GetScaleFactorForDevice(
    DISPLAY_DEVICE_TYPE deviceType
);

<DllImport("api-ms-win-shcore-scaling-l1-1-0.dll", ExactSpelling:=True)>
Public Shared Function GetScaleFactorForDevice(
    deviceType As Integer   ' DISPLAY_DEVICE_TYPE
) As Integer
End Function

' deviceType : DISPLAY_DEVICE_TYPE
Declare PtrSafe Function GetScaleFactorForDevice Lib "api-ms-win-shcore-scaling-l1-1-0" ( _
    ByVal deviceType 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

GetScaleFactorForDevice = ctypes.windll.LoadLibrary("api-ms-win-shcore-scaling-l1-1-0.dll").GetScaleFactorForDevice
GetScaleFactorForDevice.restype = ctypes.c_int
GetScaleFactorForDevice.argtypes = [
    ctypes.c_int,  # deviceType : DISPLAY_DEVICE_TYPE
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('api-ms-win-shcore-scaling-l1-1-0.dll')
GetScaleFactorForDevice = Fiddle::Function.new(
  lib['GetScaleFactorForDevice'],
  [
    Fiddle::TYPE_INT,  # deviceType : DISPLAY_DEVICE_TYPE
  ],
  Fiddle::TYPE_INT)

#[link(name = "api-ms-win-shcore-scaling-l1-1-0")]
extern "system" {
    fn GetScaleFactorForDevice(
        deviceType: i32  // DISPLAY_DEVICE_TYPE
    ) -> 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 GetScaleFactorForDevice(int deviceType);
"@
$api = Add-Type -MemberDefinition $sig -Name 'api-ms-win-shcore-scaling-l1-1-0_GetScaleFactorForDevice' -Namespace Win32 -PassThru
# $api::GetScaleFactorForDevice(deviceType)

#uselib "api-ms-win-shcore-scaling-l1-1-0.dll"
#func global GetScaleFactorForDevice "GetScaleFactorForDevice" sptr
; GetScaleFactorForDevice deviceType   ; 戻り値は stat
; deviceType : DISPLAY_DEVICE_TYPE -> "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 GetScaleFactorForDevice "GetScaleFactorForDevice" int
; res = GetScaleFactorForDevice(deviceType)
; deviceType : DISPLAY_DEVICE_TYPE -> "int"

; DEVICE_SCALE_FACTOR GetScaleFactorForDevice(DISPLAY_DEVICE_TYPE deviceType)
#uselib "api-ms-win-shcore-scaling-l1-1-0.dll"
#cfunc global GetScaleFactorForDevice "GetScaleFactorForDevice" int
; res = GetScaleFactorForDevice(deviceType)
; deviceType : DISPLAY_DEVICE_TYPE -> "int"

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")
	procGetScaleFactorForDevice = api_ms_win_shcore_scaling_l1_1_0.NewProc("GetScaleFactorForDevice")
)

// deviceType (DISPLAY_DEVICE_TYPE)
r1, _, err := procGetScaleFactorForDevice.Call(
	uintptr(deviceType),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DEVICE_SCALE_FACTOR

function GetScaleFactorForDevice(
  deviceType: Integer   // DISPLAY_DEVICE_TYPE
): Integer; stdcall;
  external 'api-ms-win-shcore-scaling-l1-1-0.dll' name 'GetScaleFactorForDevice';

result := DllCall("api-ms-win-shcore-scaling-l1-1-0\GetScaleFactorForDevice"
    , "Int", deviceType   ; DISPLAY_DEVICE_TYPE
    , "Int")   ; return: DEVICE_SCALE_FACTOR

●GetScaleFactorForDevice(deviceType) = DLL("api-ms-win-shcore-scaling-l1-1-0.dll", "int GetScaleFactorForDevice(int)")
# 呼び出し: GetScaleFactorForDevice(deviceType)
# deviceType : DISPLAY_DEVICE_TYPE -> "int"
# 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)。