GetDisplayConfigBufferSizes

// USER32.dll
#include <windows.h>

WIN32_ERROR GetDisplayConfigBufferSizes(
    QUERY_DISPLAY_CONFIG_FLAGS flags,
    DWORD* numPathArrayElements,
    DWORD* numModeInfoArrayElements
);

<DllImport("USER32.dll", ExactSpelling:=True)>
Public Shared Function GetDisplayConfigBufferSizes(
    flags As UInteger,   ' QUERY_DISPLAY_CONFIG_FLAGS
    <Out> ByRef numPathArrayElements As UInteger,   ' DWORD* out
    <Out> ByRef numModeInfoArrayElements As UInteger   ' DWORD* out
) As UInteger
End Function

' flags : QUERY_DISPLAY_CONFIG_FLAGS
' numPathArrayElements : DWORD* out
' numModeInfoArrayElements : DWORD* out
Declare PtrSafe Function GetDisplayConfigBufferSizes Lib "user32" ( _
    ByVal flags As Long, _
    ByRef numPathArrayElements As Long, _
    ByRef numModeInfoArrayElements 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

GetDisplayConfigBufferSizes = ctypes.windll.user32.GetDisplayConfigBufferSizes
GetDisplayConfigBufferSizes.restype = wintypes.DWORD
GetDisplayConfigBufferSizes.argtypes = [
    wintypes.DWORD,  # flags : QUERY_DISPLAY_CONFIG_FLAGS
    ctypes.POINTER(wintypes.DWORD),  # numPathArrayElements : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # numModeInfoArrayElements : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetDisplayConfigBufferSizes = Fiddle::Function.new(
  lib['GetDisplayConfigBufferSizes'],
  [
    -Fiddle::TYPE_INT,  # flags : QUERY_DISPLAY_CONFIG_FLAGS
    Fiddle::TYPE_VOIDP,  # numPathArrayElements : DWORD* out
    Fiddle::TYPE_VOIDP,  # numModeInfoArrayElements : DWORD* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn GetDisplayConfigBufferSizes(
        flags: u32,  // QUERY_DISPLAY_CONFIG_FLAGS
        numPathArrayElements: *mut u32,  // DWORD* out
        numModeInfoArrayElements: *mut u32  // DWORD* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll")]
public static extern uint GetDisplayConfigBufferSizes(uint flags, out uint numPathArrayElements, out uint numModeInfoArrayElements);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetDisplayConfigBufferSizes' -Namespace Win32 -PassThru
# $api::GetDisplayConfigBufferSizes(flags, numPathArrayElements, numModeInfoArrayElements)

#uselib "USER32.dll"
#func global GetDisplayConfigBufferSizes "GetDisplayConfigBufferSizes" sptr, sptr, sptr
; GetDisplayConfigBufferSizes flags, varptr(numPathArrayElements), varptr(numModeInfoArrayElements)   ; 戻り値は stat
; flags : QUERY_DISPLAY_CONFIG_FLAGS -> "sptr"
; numPathArrayElements : DWORD* out -> "sptr"
; numModeInfoArrayElements : DWORD* out -> "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 GetDisplayConfigBufferSizes "GetDisplayConfigBufferSizes" int, var, var
; res = GetDisplayConfigBufferSizes(flags, numPathArrayElements, numModeInfoArrayElements)
; flags : QUERY_DISPLAY_CONFIG_FLAGS -> "int"
; numPathArrayElements : DWORD* out -> "var"
; numModeInfoArrayElements : DWORD* out -> "var"
; ※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。

; WIN32_ERROR GetDisplayConfigBufferSizes(QUERY_DISPLAY_CONFIG_FLAGS flags, DWORD* numPathArrayElements, DWORD* numModeInfoArrayElements)
#uselib "USER32.dll"
#cfunc global GetDisplayConfigBufferSizes "GetDisplayConfigBufferSizes" int, var, var
; res = GetDisplayConfigBufferSizes(flags, numPathArrayElements, numModeInfoArrayElements)
; flags : QUERY_DISPLAY_CONFIG_FLAGS -> "int"
; numPathArrayElements : DWORD* out -> "var"
; numModeInfoArrayElements : DWORD* out -> "var"
; ※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")
	procGetDisplayConfigBufferSizes = user32.NewProc("GetDisplayConfigBufferSizes")
)

// flags (QUERY_DISPLAY_CONFIG_FLAGS), numPathArrayElements (DWORD* out), numModeInfoArrayElements (DWORD* out)
r1, _, err := procGetDisplayConfigBufferSizes.Call(
	uintptr(flags),
	uintptr(numPathArrayElements),
	uintptr(numModeInfoArrayElements),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function GetDisplayConfigBufferSizes(
  flags: DWORD;   // QUERY_DISPLAY_CONFIG_FLAGS
  numPathArrayElements: Pointer;   // DWORD* out
  numModeInfoArrayElements: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'USER32.dll' name 'GetDisplayConfigBufferSizes';

result := DllCall("USER32\GetDisplayConfigBufferSizes"
    , "UInt", flags   ; QUERY_DISPLAY_CONFIG_FLAGS
    , "Ptr", numPathArrayElements   ; DWORD* out
    , "Ptr", numModeInfoArrayElements   ; DWORD* out
    , "UInt")   ; return: WIN32_ERROR

●GetDisplayConfigBufferSizes(flags, numPathArrayElements, numModeInfoArrayElements) = DLL("USER32.dll", "dword GetDisplayConfigBufferSizes(dword, void*, void*)")
# 呼び出し: GetDisplayConfigBufferSizes(flags, numPathArrayElements, numModeInfoArrayElements)
# flags : QUERY_DISPLAY_CONFIG_FLAGS -> "dword"
# numPathArrayElements : DWORD* out -> "void*"
# numModeInfoArrayElements : DWORD* out -> "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)。