ChangeDisplaySettingsExW

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

DISP_CHANGE ChangeDisplaySettingsExW(
    LPCWSTR lpszDeviceName,   // optional
    DEVMODEW* lpDevMode,   // optional
    HWND hwnd,   // optional
    CDS_TYPE dwflags,
    void* lParam   // optional
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function ChangeDisplaySettingsExW(
    <MarshalAs(UnmanagedType.LPWStr)> lpszDeviceName As String,   ' LPCWSTR optional
    lpDevMode As IntPtr,   ' DEVMODEW* optional
    hwnd As IntPtr,   ' HWND optional
    dwflags As UInteger,   ' CDS_TYPE
    lParam As IntPtr   ' void* optional
) As Integer
End Function

' lpszDeviceName : LPCWSTR optional
' lpDevMode : DEVMODEW* optional
' hwnd : HWND optional
' dwflags : CDS_TYPE
' lParam : void* optional
Declare PtrSafe Function ChangeDisplaySettingsExW Lib "user32" ( _
    ByVal lpszDeviceName As LongPtr, _
    ByVal lpDevMode As LongPtr, _
    ByVal hwnd As LongPtr, _
    ByVal dwflags As Long, _
    ByVal lParam As LongPtr) 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

ChangeDisplaySettingsExW = ctypes.windll.user32.ChangeDisplaySettingsExW
ChangeDisplaySettingsExW.restype = ctypes.c_int
ChangeDisplaySettingsExW.argtypes = [
    wintypes.LPCWSTR,  # lpszDeviceName : LPCWSTR optional
    ctypes.c_void_p,  # lpDevMode : DEVMODEW* optional
    wintypes.HANDLE,  # hwnd : HWND optional
    wintypes.DWORD,  # dwflags : CDS_TYPE
    ctypes.POINTER(None),  # lParam : void* optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
ChangeDisplaySettingsExW = Fiddle::Function.new(
  lib['ChangeDisplaySettingsExW'],
  [
    Fiddle::TYPE_VOIDP,  # lpszDeviceName : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # lpDevMode : DEVMODEW* optional
    Fiddle::TYPE_VOIDP,  # hwnd : HWND optional
    -Fiddle::TYPE_INT,  # dwflags : CDS_TYPE
    Fiddle::TYPE_VOIDP,  # lParam : void* optional
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn ChangeDisplaySettingsExW(
        lpszDeviceName: *const u16,  // LPCWSTR optional
        lpDevMode: *mut DEVMODEW,  // DEVMODEW* optional
        hwnd: *mut core::ffi::c_void,  // HWND optional
        dwflags: u32,  // CDS_TYPE
        lParam: *mut ()  // void* optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Unicode)]
public static extern int ChangeDisplaySettingsExW([MarshalAs(UnmanagedType.LPWStr)] string lpszDeviceName, IntPtr lpDevMode, IntPtr hwnd, uint dwflags, IntPtr lParam);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_ChangeDisplaySettingsExW' -Namespace Win32 -PassThru
# $api::ChangeDisplaySettingsExW(lpszDeviceName, lpDevMode, hwnd, dwflags, lParam)

#uselib "USER32.dll"
#func global ChangeDisplaySettingsExW "ChangeDisplaySettingsExW" wptr, wptr, wptr, wptr, wptr
; ChangeDisplaySettingsExW lpszDeviceName, varptr(lpDevMode), hwnd, dwflags, lParam   ; 戻り値は stat
; lpszDeviceName : LPCWSTR optional -> "wptr"
; lpDevMode : DEVMODEW* optional -> "wptr"
; hwnd : HWND optional -> "wptr"
; dwflags : CDS_TYPE -> "wptr"
; lParam : void* optional -> "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 ChangeDisplaySettingsExW "ChangeDisplaySettingsExW" wstr, var, sptr, int, sptr
; res = ChangeDisplaySettingsExW(lpszDeviceName, lpDevMode, hwnd, dwflags, lParam)
; lpszDeviceName : LPCWSTR optional -> "wstr"
; lpDevMode : DEVMODEW* optional -> "var"
; hwnd : HWND optional -> "sptr"
; dwflags : CDS_TYPE -> "int"
; lParam : void* optional -> "sptr"
; ※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 ChangeDisplaySettingsExW(LPCWSTR lpszDeviceName, DEVMODEW* lpDevMode, HWND hwnd, CDS_TYPE dwflags, void* lParam)
#uselib "USER32.dll"
#cfunc global ChangeDisplaySettingsExW "ChangeDisplaySettingsExW" wstr, var, intptr, int, intptr
; res = ChangeDisplaySettingsExW(lpszDeviceName, lpDevMode, hwnd, dwflags, lParam)
; lpszDeviceName : LPCWSTR optional -> "wstr"
; lpDevMode : DEVMODEW* optional -> "var"
; hwnd : HWND optional -> "intptr"
; dwflags : CDS_TYPE -> "int"
; lParam : void* optional -> "intptr"
; ※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")
	procChangeDisplaySettingsExW = user32.NewProc("ChangeDisplaySettingsExW")
)

// lpszDeviceName (LPCWSTR optional), lpDevMode (DEVMODEW* optional), hwnd (HWND optional), dwflags (CDS_TYPE), lParam (void* optional)
r1, _, err := procChangeDisplaySettingsExW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszDeviceName))),
	uintptr(lpDevMode),
	uintptr(hwnd),
	uintptr(dwflags),
	uintptr(lParam),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DISP_CHANGE

function ChangeDisplaySettingsExW(
  lpszDeviceName: PWideChar;   // LPCWSTR optional
  lpDevMode: Pointer;   // DEVMODEW* optional
  hwnd: THandle;   // HWND optional
  dwflags: DWORD;   // CDS_TYPE
  lParam: Pointer   // void* optional
): Integer; stdcall;
  external 'USER32.dll' name 'ChangeDisplaySettingsExW';

result := DllCall("USER32\ChangeDisplaySettingsExW"
    , "WStr", lpszDeviceName   ; LPCWSTR optional
    , "Ptr", lpDevMode   ; DEVMODEW* optional
    , "Ptr", hwnd   ; HWND optional
    , "UInt", dwflags   ; CDS_TYPE
    , "Ptr", lParam   ; void* optional
    , "Int")   ; return: DISP_CHANGE

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