ChangeDisplaySettingsA

// USER32.dll  (ANSI / -A)
#include <windows.h>

DISP_CHANGE ChangeDisplaySettingsA(
    DEVMODEA* lpDevMode,   // optional
    CDS_TYPE dwFlags
);

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

' lpDevMode : DEVMODEA* optional
' dwFlags : CDS_TYPE
Declare PtrSafe Function ChangeDisplaySettingsA Lib "user32" ( _
    ByVal lpDevMode As LongPtr, _
    ByVal dwFlags 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

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
ChangeDisplaySettingsA = Fiddle::Function.new(
  lib['ChangeDisplaySettingsA'],
  [
    Fiddle::TYPE_VOIDP,  # lpDevMode : DEVMODEA* optional
    -Fiddle::TYPE_INT,  # dwFlags : CDS_TYPE
  ],
  Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Ansi)]
public static extern int ChangeDisplaySettingsA(IntPtr lpDevMode, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_ChangeDisplaySettingsA' -Namespace Win32 -PassThru
# $api::ChangeDisplaySettingsA(lpDevMode, dwFlags)

#uselib "USER32.dll"
#func global ChangeDisplaySettingsA "ChangeDisplaySettingsA" sptr, sptr
; ChangeDisplaySettingsA varptr(lpDevMode), dwFlags   ; 戻り値は stat
; lpDevMode : DEVMODEA* optional -> "sptr"
; dwFlags : CDS_TYPE -> "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 ChangeDisplaySettingsA "ChangeDisplaySettingsA" var, int
; res = ChangeDisplaySettingsA(lpDevMode, dwFlags)
; lpDevMode : DEVMODEA* 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 ChangeDisplaySettingsA(DEVMODEA* lpDevMode, CDS_TYPE dwFlags)
#uselib "USER32.dll"
#cfunc global ChangeDisplaySettingsA "ChangeDisplaySettingsA" var, int
; res = ChangeDisplaySettingsA(lpDevMode, dwFlags)
; lpDevMode : DEVMODEA* 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")
	procChangeDisplaySettingsA = user32.NewProc("ChangeDisplaySettingsA")
)

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

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

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

●ChangeDisplaySettingsA(lpDevMode, dwFlags) = DLL("USER32.dll", "int ChangeDisplaySettingsA(void*, dword)")
# 呼び出し: ChangeDisplaySettingsA(lpDevMode, dwFlags)
# lpDevMode : DEVMODEA* 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)。