EnumDisplayDevicesA

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

BOOL EnumDisplayDevicesA(
    LPCSTR lpDevice,   // optional
    DWORD iDevNum,
    DISPLAY_DEVICEA* lpDisplayDevice,
    DWORD dwFlags
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function EnumDisplayDevicesA(
    <MarshalAs(UnmanagedType.LPStr)> lpDevice As String,   ' LPCSTR optional
    iDevNum As UInteger,   ' DWORD
    lpDisplayDevice As IntPtr,   ' DISPLAY_DEVICEA* in/out
    dwFlags As UInteger   ' DWORD
) As Boolean
End Function

' lpDevice : LPCSTR optional
' iDevNum : DWORD
' lpDisplayDevice : DISPLAY_DEVICEA* in/out
' dwFlags : DWORD
Declare PtrSafe Function EnumDisplayDevicesA Lib "user32" ( _
    ByVal lpDevice As String, _
    ByVal iDevNum As Long, _
    ByVal lpDisplayDevice 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

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
EnumDisplayDevicesA = Fiddle::Function.new(
  lib['EnumDisplayDevicesA'],
  [
    Fiddle::TYPE_VOIDP,  # lpDevice : LPCSTR optional
    -Fiddle::TYPE_INT,  # iDevNum : DWORD
    Fiddle::TYPE_VOIDP,  # lpDisplayDevice : DISPLAY_DEVICEA* in/out
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn EnumDisplayDevicesA(
        lpDevice: *const u8,  // LPCSTR optional
        iDevNum: u32,  // DWORD
        lpDisplayDevice: *mut DISPLAY_DEVICEA,  // DISPLAY_DEVICEA* 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.Ansi)]
public static extern bool EnumDisplayDevicesA([MarshalAs(UnmanagedType.LPStr)] string lpDevice, uint iDevNum, IntPtr lpDisplayDevice, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_EnumDisplayDevicesA' -Namespace Win32 -PassThru
# $api::EnumDisplayDevicesA(lpDevice, iDevNum, lpDisplayDevice, dwFlags)

#uselib "USER32.dll"
#func global EnumDisplayDevicesA "EnumDisplayDevicesA" sptr, sptr, sptr, sptr
; EnumDisplayDevicesA lpDevice, iDevNum, varptr(lpDisplayDevice), dwFlags   ; 戻り値は stat
; lpDevice : LPCSTR optional -> "sptr"
; iDevNum : DWORD -> "sptr"
; lpDisplayDevice : DISPLAY_DEVICEA* in/out -> "sptr"
; dwFlags : 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 EnumDisplayDevicesA "EnumDisplayDevicesA" str, int, var, int
; res = EnumDisplayDevicesA(lpDevice, iDevNum, lpDisplayDevice, dwFlags)
; lpDevice : LPCSTR optional -> "str"
; iDevNum : DWORD -> "int"
; lpDisplayDevice : DISPLAY_DEVICEA* 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 EnumDisplayDevicesA(LPCSTR lpDevice, DWORD iDevNum, DISPLAY_DEVICEA* lpDisplayDevice, DWORD dwFlags)
#uselib "USER32.dll"
#cfunc global EnumDisplayDevicesA "EnumDisplayDevicesA" str, int, var, int
; res = EnumDisplayDevicesA(lpDevice, iDevNum, lpDisplayDevice, dwFlags)
; lpDevice : LPCSTR optional -> "str"
; iDevNum : DWORD -> "int"
; lpDisplayDevice : DISPLAY_DEVICEA* 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")
	procEnumDisplayDevicesA = user32.NewProc("EnumDisplayDevicesA")
)

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

function EnumDisplayDevicesA(
  lpDevice: PAnsiChar;   // LPCSTR optional
  iDevNum: DWORD;   // DWORD
  lpDisplayDevice: Pointer;   // DISPLAY_DEVICEA* in/out
  dwFlags: DWORD   // DWORD
): BOOL; stdcall;
  external 'USER32.dll' name 'EnumDisplayDevicesA';

result := DllCall("USER32\EnumDisplayDevicesA"
    , "AStr", lpDevice   ; LPCSTR optional
    , "UInt", iDevNum   ; DWORD
    , "Ptr", lpDisplayDevice   ; DISPLAY_DEVICEA* in/out
    , "UInt", dwFlags   ; DWORD
    , "Int")   ; return: BOOL

●EnumDisplayDevicesA(lpDevice, iDevNum, lpDisplayDevice, dwFlags) = DLL("USER32.dll", "bool EnumDisplayDevicesA(char*, dword, void*, dword)")
# 呼び出し: EnumDisplayDevicesA(lpDevice, iDevNum, lpDisplayDevice, dwFlags)
# lpDevice : LPCSTR optional -> "char*"
# iDevNum : DWORD -> "dword"
# lpDisplayDevice : DISPLAY_DEVICEA* 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)。