AdjustWindowRectExForDpi

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

BOOL AdjustWindowRectExForDpi(
    RECT* lpRect,
    WINDOW_STYLE dwStyle,
    BOOL bMenu,
    WINDOW_EX_STYLE dwExStyle,
    DWORD dpi
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function AdjustWindowRectExForDpi(
    lpRect As IntPtr,   ' RECT* in/out
    dwStyle As UInteger,   ' WINDOW_STYLE
    bMenu As Boolean,   ' BOOL
    dwExStyle As UInteger,   ' WINDOW_EX_STYLE
    dpi As UInteger   ' DWORD
) As Boolean
End Function

' lpRect : RECT* in/out
' dwStyle : WINDOW_STYLE
' bMenu : BOOL
' dwExStyle : WINDOW_EX_STYLE
' dpi : DWORD
Declare PtrSafe Function AdjustWindowRectExForDpi Lib "user32" ( _
    ByVal lpRect As LongPtr, _
    ByVal dwStyle As Long, _
    ByVal bMenu As Long, _
    ByVal dwExStyle 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

AdjustWindowRectExForDpi = ctypes.windll.user32.AdjustWindowRectExForDpi
AdjustWindowRectExForDpi.restype = wintypes.BOOL
AdjustWindowRectExForDpi.argtypes = [
    ctypes.c_void_p,  # lpRect : RECT* in/out
    wintypes.DWORD,  # dwStyle : WINDOW_STYLE
    wintypes.BOOL,  # bMenu : BOOL
    wintypes.DWORD,  # dwExStyle : WINDOW_EX_STYLE
    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')
AdjustWindowRectExForDpi = Fiddle::Function.new(
  lib['AdjustWindowRectExForDpi'],
  [
    Fiddle::TYPE_VOIDP,  # lpRect : RECT* in/out
    -Fiddle::TYPE_INT,  # dwStyle : WINDOW_STYLE
    Fiddle::TYPE_INT,  # bMenu : BOOL
    -Fiddle::TYPE_INT,  # dwExStyle : WINDOW_EX_STYLE
    -Fiddle::TYPE_INT,  # dpi : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn AdjustWindowRectExForDpi(
        lpRect: *mut RECT,  // RECT* in/out
        dwStyle: u32,  // WINDOW_STYLE
        bMenu: i32,  // BOOL
        dwExStyle: u32,  // WINDOW_EX_STYLE
        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 AdjustWindowRectExForDpi(IntPtr lpRect, uint dwStyle, bool bMenu, uint dwExStyle, uint dpi);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_AdjustWindowRectExForDpi' -Namespace Win32 -PassThru
# $api::AdjustWindowRectExForDpi(lpRect, dwStyle, bMenu, dwExStyle, dpi)

#uselib "USER32.dll"
#func global AdjustWindowRectExForDpi "AdjustWindowRectExForDpi" sptr, sptr, sptr, sptr, sptr
; AdjustWindowRectExForDpi varptr(lpRect), dwStyle, bMenu, dwExStyle, dpi   ; 戻り値は stat
; lpRect : RECT* in/out -> "sptr"
; dwStyle : WINDOW_STYLE -> "sptr"
; bMenu : BOOL -> "sptr"
; dwExStyle : WINDOW_EX_STYLE -> "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 AdjustWindowRectExForDpi "AdjustWindowRectExForDpi" var, int, int, int, int
; res = AdjustWindowRectExForDpi(lpRect, dwStyle, bMenu, dwExStyle, dpi)
; lpRect : RECT* in/out -> "var"
; dwStyle : WINDOW_STYLE -> "int"
; bMenu : BOOL -> "int"
; dwExStyle : WINDOW_EX_STYLE -> "int"
; dpi : DWORD -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; BOOL AdjustWindowRectExForDpi(RECT* lpRect, WINDOW_STYLE dwStyle, BOOL bMenu, WINDOW_EX_STYLE dwExStyle, DWORD dpi)
#uselib "USER32.dll"
#cfunc global AdjustWindowRectExForDpi "AdjustWindowRectExForDpi" var, int, int, int, int
; res = AdjustWindowRectExForDpi(lpRect, dwStyle, bMenu, dwExStyle, dpi)
; lpRect : RECT* in/out -> "var"
; dwStyle : WINDOW_STYLE -> "int"
; bMenu : BOOL -> "int"
; dwExStyle : WINDOW_EX_STYLE -> "int"
; dpi : DWORD -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procAdjustWindowRectExForDpi = user32.NewProc("AdjustWindowRectExForDpi")
)

// lpRect (RECT* in/out), dwStyle (WINDOW_STYLE), bMenu (BOOL), dwExStyle (WINDOW_EX_STYLE), dpi (DWORD)
r1, _, err := procAdjustWindowRectExForDpi.Call(
	uintptr(lpRect),
	uintptr(dwStyle),
	uintptr(bMenu),
	uintptr(dwExStyle),
	uintptr(dpi),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function AdjustWindowRectExForDpi(
  lpRect: Pointer;   // RECT* in/out
  dwStyle: DWORD;   // WINDOW_STYLE
  bMenu: BOOL;   // BOOL
  dwExStyle: DWORD;   // WINDOW_EX_STYLE
  dpi: DWORD   // DWORD
): BOOL; stdcall;
  external 'USER32.dll' name 'AdjustWindowRectExForDpi';

result := DllCall("USER32\AdjustWindowRectExForDpi"
    , "Ptr", lpRect   ; RECT* in/out
    , "UInt", dwStyle   ; WINDOW_STYLE
    , "Int", bMenu   ; BOOL
    , "UInt", dwExStyle   ; WINDOW_EX_STYLE
    , "UInt", dpi   ; DWORD
    , "Int")   ; return: BOOL

●AdjustWindowRectExForDpi(lpRect, dwStyle, bMenu, dwExStyle, dpi) = DLL("USER32.dll", "bool AdjustWindowRectExForDpi(void*, dword, bool, dword, dword)")
# 呼び出し: AdjustWindowRectExForDpi(lpRect, dwStyle, bMenu, dwExStyle, dpi)
# lpRect : RECT* in/out -> "void*"
# dwStyle : WINDOW_STYLE -> "dword"
# bMenu : BOOL -> "bool"
# dwExStyle : WINDOW_EX_STYLE -> "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)。