GetDpiForSystem

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

DWORD GetDpiForSystem(void);

<DllImport("USER32.dll", ExactSpelling:=True)>
Public Shared Function GetDpiForSystem() As UInteger
End Function

Declare PtrSafe Function GetDpiForSystem Lib "user32" () As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetDpiForSystem = ctypes.windll.user32.GetDpiForSystem
GetDpiForSystem.restype = wintypes.DWORD
GetDpiForSystem.argtypes = []

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetDpiForSystem = Fiddle::Function.new(
  lib['GetDpiForSystem'],
  [],
  -Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn GetDpiForSystem() -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll")]
public static extern uint GetDpiForSystem();
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetDpiForSystem' -Namespace Win32 -PassThru
# $api::GetDpiForSystem()

#uselib "USER32.dll"
#func global GetDpiForSystem "GetDpiForSystem"
; GetDpiForSystem   ; 戻り値は stat
; ※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 GetDpiForSystem "GetDpiForSystem"
; res = GetDpiForSystem()

; DWORD GetDpiForSystem()
#uselib "USER32.dll"
#cfunc global GetDpiForSystem "GetDpiForSystem"
; res = GetDpiForSystem()

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procGetDpiForSystem = user32.NewProc("GetDpiForSystem")
)

r1, _, err := procGetDpiForSystem.Call()
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetDpiForSystem: DWORD; stdcall;
  external 'USER32.dll' name 'GetDpiForSystem';

result := DllCall("USER32\GetDpiForSystem", "UInt")

●GetDpiForSystem() = DLL("USER32.dll", "dword GetDpiForSystem()")
# 呼び出し: GetDpiForSystem()
# 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)。