GetSystemDpiForProcess

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

DWORD GetSystemDpiForProcess(
    HANDLE hProcess
);

<DllImport("USER32.dll", ExactSpelling:=True)>
Public Shared Function GetSystemDpiForProcess(
    hProcess As IntPtr   ' HANDLE
) As UInteger
End Function

' hProcess : HANDLE
Declare PtrSafe Function GetSystemDpiForProcess Lib "user32" ( _
    ByVal hProcess As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetSystemDpiForProcess = ctypes.windll.user32.GetSystemDpiForProcess
GetSystemDpiForProcess.restype = wintypes.DWORD
GetSystemDpiForProcess.argtypes = [
    wintypes.HANDLE,  # hProcess : HANDLE
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetSystemDpiForProcess = Fiddle::Function.new(
  lib['GetSystemDpiForProcess'],
  [
    Fiddle::TYPE_VOIDP,  # hProcess : HANDLE
  ],
  -Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn GetSystemDpiForProcess(
        hProcess: *mut core::ffi::c_void  // HANDLE
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll")]
public static extern uint GetSystemDpiForProcess(IntPtr hProcess);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetSystemDpiForProcess' -Namespace Win32 -PassThru
# $api::GetSystemDpiForProcess(hProcess)

#uselib "USER32.dll"
#func global GetSystemDpiForProcess "GetSystemDpiForProcess" sptr
; GetSystemDpiForProcess hProcess   ; 戻り値は stat
; hProcess : HANDLE -> "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 GetSystemDpiForProcess "GetSystemDpiForProcess" sptr
; res = GetSystemDpiForProcess(hProcess)
; hProcess : HANDLE -> "sptr"

; DWORD GetSystemDpiForProcess(HANDLE hProcess)
#uselib "USER32.dll"
#cfunc global GetSystemDpiForProcess "GetSystemDpiForProcess" intptr
; res = GetSystemDpiForProcess(hProcess)
; hProcess : HANDLE -> "intptr"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procGetSystemDpiForProcess = user32.NewProc("GetSystemDpiForProcess")
)

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

function GetSystemDpiForProcess(
  hProcess: THandle   // HANDLE
): DWORD; stdcall;
  external 'USER32.dll' name 'GetSystemDpiForProcess';

result := DllCall("USER32\GetSystemDpiForProcess"
    , "Ptr", hProcess   ; HANDLE
    , "UInt")   ; return: DWORD

●GetSystemDpiForProcess(hProcess) = DLL("USER32.dll", "dword GetSystemDpiForProcess(void*)")
# 呼び出し: GetSystemDpiForProcess(hProcess)
# hProcess : HANDLE -> "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)。