SystemParametersInfoForDpi

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

BOOL SystemParametersInfoForDpi(
    DWORD uiAction,
    DWORD uiParam,
    void* pvParam,   // optional
    DWORD fWinIni,
    DWORD dpi
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SystemParametersInfoForDpi(
    uiAction As UInteger,   ' DWORD
    uiParam As UInteger,   ' DWORD
    pvParam As IntPtr,   ' void* optional, in/out
    fWinIni As UInteger,   ' DWORD
    dpi As UInteger   ' DWORD
) As Boolean
End Function

' uiAction : DWORD
' uiParam : DWORD
' pvParam : void* optional, in/out
' fWinIni : DWORD
' dpi : DWORD
Declare PtrSafe Function SystemParametersInfoForDpi Lib "user32" ( _
    ByVal uiAction As Long, _
    ByVal uiParam As Long, _
    ByVal pvParam As LongPtr, _
    ByVal fWinIni As Long, _
    ByVal dpi 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

SystemParametersInfoForDpi = ctypes.windll.user32.SystemParametersInfoForDpi
SystemParametersInfoForDpi.restype = wintypes.BOOL
SystemParametersInfoForDpi.argtypes = [
    wintypes.DWORD,  # uiAction : DWORD
    wintypes.DWORD,  # uiParam : DWORD
    ctypes.POINTER(None),  # pvParam : void* optional, in/out
    wintypes.DWORD,  # fWinIni : DWORD
    wintypes.DWORD,  # dpi : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
SystemParametersInfoForDpi = Fiddle::Function.new(
  lib['SystemParametersInfoForDpi'],
  [
    -Fiddle::TYPE_INT,  # uiAction : DWORD
    -Fiddle::TYPE_INT,  # uiParam : DWORD
    Fiddle::TYPE_VOIDP,  # pvParam : void* optional, in/out
    -Fiddle::TYPE_INT,  # fWinIni : DWORD
    -Fiddle::TYPE_INT,  # dpi : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn SystemParametersInfoForDpi(
        uiAction: u32,  // DWORD
        uiParam: u32,  // DWORD
        pvParam: *mut (),  // void* optional, in/out
        fWinIni: u32,  // DWORD
        dpi: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", SetLastError = true)]
public static extern bool SystemParametersInfoForDpi(uint uiAction, uint uiParam, IntPtr pvParam, uint fWinIni, uint dpi);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_SystemParametersInfoForDpi' -Namespace Win32 -PassThru
# $api::SystemParametersInfoForDpi(uiAction, uiParam, pvParam, fWinIni, dpi)

#uselib "USER32.dll"
#func global SystemParametersInfoForDpi "SystemParametersInfoForDpi" sptr, sptr, sptr, sptr, sptr
; SystemParametersInfoForDpi uiAction, uiParam, pvParam, fWinIni, dpi   ; 戻り値は stat
; uiAction : DWORD -> "sptr"
; uiParam : DWORD -> "sptr"
; pvParam : void* optional, in/out -> "sptr"
; fWinIni : DWORD -> "sptr"
; dpi : DWORD -> "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 SystemParametersInfoForDpi "SystemParametersInfoForDpi" int, int, sptr, int, int
; res = SystemParametersInfoForDpi(uiAction, uiParam, pvParam, fWinIni, dpi)
; uiAction : DWORD -> "int"
; uiParam : DWORD -> "int"
; pvParam : void* optional, in/out -> "sptr"
; fWinIni : DWORD -> "int"
; dpi : DWORD -> "int"

; BOOL SystemParametersInfoForDpi(DWORD uiAction, DWORD uiParam, void* pvParam, DWORD fWinIni, DWORD dpi)
#uselib "USER32.dll"
#cfunc global SystemParametersInfoForDpi "SystemParametersInfoForDpi" int, int, intptr, int, int
; res = SystemParametersInfoForDpi(uiAction, uiParam, pvParam, fWinIni, dpi)
; uiAction : DWORD -> "int"
; uiParam : DWORD -> "int"
; pvParam : void* optional, in/out -> "intptr"
; fWinIni : DWORD -> "int"
; dpi : DWORD -> "int"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procSystemParametersInfoForDpi = user32.NewProc("SystemParametersInfoForDpi")
)

// uiAction (DWORD), uiParam (DWORD), pvParam (void* optional, in/out), fWinIni (DWORD), dpi (DWORD)
r1, _, err := procSystemParametersInfoForDpi.Call(
	uintptr(uiAction),
	uintptr(uiParam),
	uintptr(pvParam),
	uintptr(fWinIni),
	uintptr(dpi),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SystemParametersInfoForDpi(
  uiAction: DWORD;   // DWORD
  uiParam: DWORD;   // DWORD
  pvParam: Pointer;   // void* optional, in/out
  fWinIni: DWORD;   // DWORD
  dpi: DWORD   // DWORD
): BOOL; stdcall;
  external 'USER32.dll' name 'SystemParametersInfoForDpi';

result := DllCall("USER32\SystemParametersInfoForDpi"
    , "UInt", uiAction   ; DWORD
    , "UInt", uiParam   ; DWORD
    , "Ptr", pvParam   ; void* optional, in/out
    , "UInt", fWinIni   ; DWORD
    , "UInt", dpi   ; DWORD
    , "Int")   ; return: BOOL

●SystemParametersInfoForDpi(uiAction, uiParam, pvParam, fWinIni, dpi) = DLL("USER32.dll", "bool SystemParametersInfoForDpi(dword, dword, void*, dword, dword)")
# 呼び出し: SystemParametersInfoForDpi(uiAction, uiParam, pvParam, fWinIni, dpi)
# uiAction : DWORD -> "dword"
# uiParam : DWORD -> "dword"
# pvParam : void* optional, in/out -> "void*"
# fWinIni : DWORD -> "dword"
# dpi : DWORD -> "dword"
# 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)。