ChangeDisplaySettingsW

// USER32.dll  (Unicode / -W)
#include <windows.h>

DISP_CHANGE ChangeDisplaySettingsW(
    DEVMODEW* lpDevMode,   // optional
    CDS_TYPE dwFlags
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function ChangeDisplaySettingsW(
    lpDevMode As IntPtr,   ' DEVMODEW* optional
    dwFlags As UInteger   ' CDS_TYPE
) As Integer
End Function

' lpDevMode : DEVMODEW* optional
' dwFlags : CDS_TYPE
Declare PtrSafe Function ChangeDisplaySettingsW Lib "user32" ( _
    ByVal lpDevMode As LongPtr, _
    ByVal dwFlags As Long) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

ChangeDisplaySettingsW = ctypes.windll.user32.ChangeDisplaySettingsW
ChangeDisplaySettingsW.restype = ctypes.c_int
ChangeDisplaySettingsW.argtypes = [
    ctypes.c_void_p,  # lpDevMode : DEVMODEW* optional
    wintypes.DWORD,  # dwFlags : CDS_TYPE
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
ChangeDisplaySettingsW = Fiddle::Function.new(
  lib['ChangeDisplaySettingsW'],
  [
    Fiddle::TYPE_VOIDP,  # lpDevMode : DEVMODEW* optional
    -Fiddle::TYPE_INT,  # dwFlags : CDS_TYPE
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn ChangeDisplaySettingsW(
        lpDevMode: *mut DEVMODEW,  // DEVMODEW* optional
        dwFlags: u32  // CDS_TYPE
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Unicode)]
public static extern int ChangeDisplaySettingsW(IntPtr lpDevMode, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_ChangeDisplaySettingsW' -Namespace Win32 -PassThru
# $api::ChangeDisplaySettingsW(lpDevMode, dwFlags)

#uselib "USER32.dll"
#func global ChangeDisplaySettingsW "ChangeDisplaySettingsW" wptr, wptr
; ChangeDisplaySettingsW varptr(lpDevMode), dwFlags   ; 戻り値は stat
; lpDevMode : DEVMODEW* optional -> "wptr"
; dwFlags : CDS_TYPE -> "wptr"
; ※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 ChangeDisplaySettingsW "ChangeDisplaySettingsW" var, int
; res = ChangeDisplaySettingsW(lpDevMode, dwFlags)
; lpDevMode : DEVMODEW* optional -> "var"
; dwFlags : CDS_TYPE -> "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。

; DISP_CHANGE ChangeDisplaySettingsW(DEVMODEW* lpDevMode, CDS_TYPE dwFlags)
#uselib "USER32.dll"
#cfunc global ChangeDisplaySettingsW "ChangeDisplaySettingsW" var, int
; res = ChangeDisplaySettingsW(lpDevMode, dwFlags)
; lpDevMode : DEVMODEW* optional -> "var"
; dwFlags : CDS_TYPE -> "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")
	procChangeDisplaySettingsW = user32.NewProc("ChangeDisplaySettingsW")
)

// lpDevMode (DEVMODEW* optional), dwFlags (CDS_TYPE)
r1, _, err := procChangeDisplaySettingsW.Call(
	uintptr(lpDevMode),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DISP_CHANGE

function ChangeDisplaySettingsW(
  lpDevMode: Pointer;   // DEVMODEW* optional
  dwFlags: DWORD   // CDS_TYPE
): Integer; stdcall;
  external 'USER32.dll' name 'ChangeDisplaySettingsW';

result := DllCall("USER32\ChangeDisplaySettingsW"
    , "Ptr", lpDevMode   ; DEVMODEW* optional
    , "UInt", dwFlags   ; CDS_TYPE
    , "Int")   ; return: DISP_CHANGE

●ChangeDisplaySettingsW(lpDevMode, dwFlags) = DLL("USER32.dll", "int ChangeDisplaySettingsW(void*, dword)")
# 呼び出し: ChangeDisplaySettingsW(lpDevMode, dwFlags)
# lpDevMode : DEVMODEW* optional -> "void*"
# dwFlags : CDS_TYPE -> "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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。