EnumDisplayDevicesW

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

BOOL EnumDisplayDevicesW(
    LPCWSTR lpDevice,   // optional
    DWORD iDevNum,
    DISPLAY_DEVICEW* lpDisplayDevice,
    DWORD dwFlags
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function EnumDisplayDevicesW(
    <MarshalAs(UnmanagedType.LPWStr)> lpDevice As String,   ' LPCWSTR optional
    iDevNum As UInteger,   ' DWORD
    lpDisplayDevice As IntPtr,   ' DISPLAY_DEVICEW* in/out
    dwFlags As UInteger   ' DWORD
) As Boolean
End Function

' lpDevice : LPCWSTR optional
' iDevNum : DWORD
' lpDisplayDevice : DISPLAY_DEVICEW* in/out
' dwFlags : DWORD
Declare PtrSafe Function EnumDisplayDevicesW Lib "user32" ( _
    ByVal lpDevice As LongPtr, _
    ByVal iDevNum As Long, _
    ByVal lpDisplayDevice 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

EnumDisplayDevicesW = ctypes.windll.user32.EnumDisplayDevicesW
EnumDisplayDevicesW.restype = wintypes.BOOL
EnumDisplayDevicesW.argtypes = [
    wintypes.LPCWSTR,  # lpDevice : LPCWSTR optional
    wintypes.DWORD,  # iDevNum : DWORD
    ctypes.c_void_p,  # lpDisplayDevice : DISPLAY_DEVICEW* in/out
    wintypes.DWORD,  # dwFlags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
EnumDisplayDevicesW = Fiddle::Function.new(
  lib['EnumDisplayDevicesW'],
  [
    Fiddle::TYPE_VOIDP,  # lpDevice : LPCWSTR optional
    -Fiddle::TYPE_INT,  # iDevNum : DWORD
    Fiddle::TYPE_VOIDP,  # lpDisplayDevice : DISPLAY_DEVICEW* in/out
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn EnumDisplayDevicesW(
        lpDevice: *const u16,  // LPCWSTR optional
        iDevNum: u32,  // DWORD
        lpDisplayDevice: *mut DISPLAY_DEVICEW,  // DISPLAY_DEVICEW* in/out
        dwFlags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", CharSet = CharSet.Unicode)]
public static extern bool EnumDisplayDevicesW([MarshalAs(UnmanagedType.LPWStr)] string lpDevice, uint iDevNum, IntPtr lpDisplayDevice, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_EnumDisplayDevicesW' -Namespace Win32 -PassThru
# $api::EnumDisplayDevicesW(lpDevice, iDevNum, lpDisplayDevice, dwFlags)

#uselib "USER32.dll"
#func global EnumDisplayDevicesW "EnumDisplayDevicesW" wptr, wptr, wptr, wptr
; EnumDisplayDevicesW lpDevice, iDevNum, varptr(lpDisplayDevice), dwFlags   ; 戻り値は stat
; lpDevice : LPCWSTR optional -> "wptr"
; iDevNum : DWORD -> "wptr"
; lpDisplayDevice : DISPLAY_DEVICEW* in/out -> "wptr"
; dwFlags : DWORD -> "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 EnumDisplayDevicesW "EnumDisplayDevicesW" wstr, int, var, int
; res = EnumDisplayDevicesW(lpDevice, iDevNum, lpDisplayDevice, dwFlags)
; lpDevice : LPCWSTR optional -> "wstr"
; iDevNum : DWORD -> "int"
; lpDisplayDevice : DISPLAY_DEVICEW* in/out -> "var"
; dwFlags : 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 EnumDisplayDevicesW(LPCWSTR lpDevice, DWORD iDevNum, DISPLAY_DEVICEW* lpDisplayDevice, DWORD dwFlags)
#uselib "USER32.dll"
#cfunc global EnumDisplayDevicesW "EnumDisplayDevicesW" wstr, int, var, int
; res = EnumDisplayDevicesW(lpDevice, iDevNum, lpDisplayDevice, dwFlags)
; lpDevice : LPCWSTR optional -> "wstr"
; iDevNum : DWORD -> "int"
; lpDisplayDevice : DISPLAY_DEVICEW* in/out -> "var"
; dwFlags : 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")
	procEnumDisplayDevicesW = user32.NewProc("EnumDisplayDevicesW")
)

// lpDevice (LPCWSTR optional), iDevNum (DWORD), lpDisplayDevice (DISPLAY_DEVICEW* in/out), dwFlags (DWORD)
r1, _, err := procEnumDisplayDevicesW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpDevice))),
	uintptr(iDevNum),
	uintptr(lpDisplayDevice),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function EnumDisplayDevicesW(
  lpDevice: PWideChar;   // LPCWSTR optional
  iDevNum: DWORD;   // DWORD
  lpDisplayDevice: Pointer;   // DISPLAY_DEVICEW* in/out
  dwFlags: DWORD   // DWORD
): BOOL; stdcall;
  external 'USER32.dll' name 'EnumDisplayDevicesW';

result := DllCall("USER32\EnumDisplayDevicesW"
    , "WStr", lpDevice   ; LPCWSTR optional
    , "UInt", iDevNum   ; DWORD
    , "Ptr", lpDisplayDevice   ; DISPLAY_DEVICEW* in/out
    , "UInt", dwFlags   ; DWORD
    , "Int")   ; return: BOOL

●EnumDisplayDevicesW(lpDevice, iDevNum, lpDisplayDevice, dwFlags) = DLL("USER32.dll", "bool EnumDisplayDevicesW(char*, dword, void*, dword)")
# 呼び出し: EnumDisplayDevicesW(lpDevice, iDevNum, lpDisplayDevice, dwFlags)
# lpDevice : LPCWSTR optional -> "char*"
# iDevNum : DWORD -> "dword"
# lpDisplayDevice : DISPLAY_DEVICEW* in/out -> "void*"
# dwFlags : 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。