GetAddrInfoExW

// WS2_32.dll  (Unicode / -W)
#include <windows.h>

INT GetAddrInfoExW(
    LPCWSTR pName,   // optional
    LPCWSTR pServiceName,   // optional
    DWORD dwNameSpace,
    GUID* lpNspId,   // optional
    const ADDRINFOEXW* hints,   // optional
    ADDRINFOEXW** ppResult,
    TIMEVAL* timeout,   // optional
    OVERLAPPED* lpOverlapped,   // optional
    LPLOOKUPSERVICE_COMPLETION_ROUTINE lpCompletionRoutine,   // optional
    HANDLE* lpHandle   // optional
);

<DllImport("WS2_32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function GetAddrInfoExW(
    <MarshalAs(UnmanagedType.LPWStr)> pName As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> pServiceName As String,   ' LPCWSTR optional
    dwNameSpace As UInteger,   ' DWORD
    lpNspId As IntPtr,   ' GUID* optional
    hints As IntPtr,   ' ADDRINFOEXW* optional
    ppResult As IntPtr,   ' ADDRINFOEXW** out
    timeout As IntPtr,   ' TIMEVAL* optional
    lpOverlapped As IntPtr,   ' OVERLAPPED* optional
    lpCompletionRoutine As IntPtr,   ' LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
    lpHandle As IntPtr   ' HANDLE* optional, out
) As Integer
End Function

' pName : LPCWSTR optional
' pServiceName : LPCWSTR optional
' dwNameSpace : DWORD
' lpNspId : GUID* optional
' hints : ADDRINFOEXW* optional
' ppResult : ADDRINFOEXW** out
' timeout : TIMEVAL* optional
' lpOverlapped : OVERLAPPED* optional
' lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
' lpHandle : HANDLE* optional, out
Declare PtrSafe Function GetAddrInfoExW Lib "ws2_32" ( _
    ByVal pName As LongPtr, _
    ByVal pServiceName As LongPtr, _
    ByVal dwNameSpace As Long, _
    ByVal lpNspId As LongPtr, _
    ByVal hints As LongPtr, _
    ByVal ppResult As LongPtr, _
    ByVal timeout As LongPtr, _
    ByVal lpOverlapped As LongPtr, _
    ByVal lpCompletionRoutine As LongPtr, _
    ByVal lpHandle 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

GetAddrInfoExW = ctypes.windll.ws2_32.GetAddrInfoExW
GetAddrInfoExW.restype = ctypes.c_int
GetAddrInfoExW.argtypes = [
    wintypes.LPCWSTR,  # pName : LPCWSTR optional
    wintypes.LPCWSTR,  # pServiceName : LPCWSTR optional
    wintypes.DWORD,  # dwNameSpace : DWORD
    ctypes.c_void_p,  # lpNspId : GUID* optional
    ctypes.c_void_p,  # hints : ADDRINFOEXW* optional
    ctypes.c_void_p,  # ppResult : ADDRINFOEXW** out
    ctypes.c_void_p,  # timeout : TIMEVAL* optional
    ctypes.c_void_p,  # lpOverlapped : OVERLAPPED* optional
    ctypes.c_void_p,  # lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
    ctypes.c_void_p,  # lpHandle : HANDLE* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
GetAddrInfoExW = Fiddle::Function.new(
  lib['GetAddrInfoExW'],
  [
    Fiddle::TYPE_VOIDP,  # pName : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # pServiceName : LPCWSTR optional
    -Fiddle::TYPE_INT,  # dwNameSpace : DWORD
    Fiddle::TYPE_VOIDP,  # lpNspId : GUID* optional
    Fiddle::TYPE_VOIDP,  # hints : ADDRINFOEXW* optional
    Fiddle::TYPE_VOIDP,  # ppResult : ADDRINFOEXW** out
    Fiddle::TYPE_VOIDP,  # timeout : TIMEVAL* optional
    Fiddle::TYPE_VOIDP,  # lpOverlapped : OVERLAPPED* optional
    Fiddle::TYPE_VOIDP,  # lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
    Fiddle::TYPE_VOIDP,  # lpHandle : HANDLE* optional, out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "ws2_32")]
extern "system" {
    fn GetAddrInfoExW(
        pName: *const u16,  // LPCWSTR optional
        pServiceName: *const u16,  // LPCWSTR optional
        dwNameSpace: u32,  // DWORD
        lpNspId: *mut GUID,  // GUID* optional
        hints: *const ADDRINFOEXW,  // ADDRINFOEXW* optional
        ppResult: *mut *mut ADDRINFOEXW,  // ADDRINFOEXW** out
        timeout: *mut TIMEVAL,  // TIMEVAL* optional
        lpOverlapped: *mut OVERLAPPED,  // OVERLAPPED* optional
        lpCompletionRoutine: *const core::ffi::c_void,  // LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
        lpHandle: *mut *mut core::ffi::c_void  // HANDLE* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", CharSet = CharSet.Unicode)]
public static extern int GetAddrInfoExW([MarshalAs(UnmanagedType.LPWStr)] string pName, [MarshalAs(UnmanagedType.LPWStr)] string pServiceName, uint dwNameSpace, IntPtr lpNspId, IntPtr hints, IntPtr ppResult, IntPtr timeout, IntPtr lpOverlapped, IntPtr lpCompletionRoutine, IntPtr lpHandle);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_GetAddrInfoExW' -Namespace Win32 -PassThru
# $api::GetAddrInfoExW(pName, pServiceName, dwNameSpace, lpNspId, hints, ppResult, timeout, lpOverlapped, lpCompletionRoutine, lpHandle)

#uselib "WS2_32.dll"
#func global GetAddrInfoExW "GetAddrInfoExW" wptr, wptr, wptr, wptr, wptr, wptr, wptr, wptr, wptr, wptr
; GetAddrInfoExW pName, pServiceName, dwNameSpace, varptr(lpNspId), varptr(hints), varptr(ppResult), varptr(timeout), varptr(lpOverlapped), lpCompletionRoutine, lpHandle   ; 戻り値は stat
; pName : LPCWSTR optional -> "wptr"
; pServiceName : LPCWSTR optional -> "wptr"
; dwNameSpace : DWORD -> "wptr"
; lpNspId : GUID* optional -> "wptr"
; hints : ADDRINFOEXW* optional -> "wptr"
; ppResult : ADDRINFOEXW** out -> "wptr"
; timeout : TIMEVAL* optional -> "wptr"
; lpOverlapped : OVERLAPPED* optional -> "wptr"
; lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional -> "wptr"
; lpHandle : HANDLE* optional, out -> "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。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	ws2_32 = windows.NewLazySystemDLL("WS2_32.dll")
	procGetAddrInfoExW = ws2_32.NewProc("GetAddrInfoExW")
)

// pName (LPCWSTR optional), pServiceName (LPCWSTR optional), dwNameSpace (DWORD), lpNspId (GUID* optional), hints (ADDRINFOEXW* optional), ppResult (ADDRINFOEXW** out), timeout (TIMEVAL* optional), lpOverlapped (OVERLAPPED* optional), lpCompletionRoutine (LPLOOKUPSERVICE_COMPLETION_ROUTINE optional), lpHandle (HANDLE* optional, out)
r1, _, err := procGetAddrInfoExW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pName))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pServiceName))),
	uintptr(dwNameSpace),
	uintptr(lpNspId),
	uintptr(hints),
	uintptr(ppResult),
	uintptr(timeout),
	uintptr(lpOverlapped),
	uintptr(lpCompletionRoutine),
	uintptr(lpHandle),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function GetAddrInfoExW(
  pName: PWideChar;   // LPCWSTR optional
  pServiceName: PWideChar;   // LPCWSTR optional
  dwNameSpace: DWORD;   // DWORD
  lpNspId: PGUID;   // GUID* optional
  hints: Pointer;   // ADDRINFOEXW* optional
  ppResult: Pointer;   // ADDRINFOEXW** out
  timeout: Pointer;   // TIMEVAL* optional
  lpOverlapped: Pointer;   // OVERLAPPED* optional
  lpCompletionRoutine: Pointer;   // LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
  lpHandle: Pointer   // HANDLE* optional, out
): Integer; stdcall;
  external 'WS2_32.dll' name 'GetAddrInfoExW';

result := DllCall("WS2_32\GetAddrInfoExW"
    , "WStr", pName   ; LPCWSTR optional
    , "WStr", pServiceName   ; LPCWSTR optional
    , "UInt", dwNameSpace   ; DWORD
    , "Ptr", lpNspId   ; GUID* optional
    , "Ptr", hints   ; ADDRINFOEXW* optional
    , "Ptr", ppResult   ; ADDRINFOEXW** out
    , "Ptr", timeout   ; TIMEVAL* optional
    , "Ptr", lpOverlapped   ; OVERLAPPED* optional
    , "Ptr", lpCompletionRoutine   ; LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
    , "Ptr", lpHandle   ; HANDLE* optional, out
    , "Int")   ; return: INT

●GetAddrInfoExW(pName, pServiceName, dwNameSpace, lpNspId, hints, ppResult, timeout, lpOverlapped, lpCompletionRoutine, lpHandle) = DLL("WS2_32.dll", "int GetAddrInfoExW(char*, char*, dword, void*, void*, void*, void*, void*, void*, void*)")
# 呼び出し: GetAddrInfoExW(pName, pServiceName, dwNameSpace, lpNspId, hints, ppResult, timeout, lpOverlapped, lpCompletionRoutine, lpHandle)
# pName : LPCWSTR optional -> "char*"
# pServiceName : LPCWSTR optional -> "char*"
# dwNameSpace : DWORD -> "dword"
# lpNspId : GUID* optional -> "void*"
# hints : ADDRINFOEXW* optional -> "void*"
# ppResult : ADDRINFOEXW** out -> "void*"
# timeout : TIMEVAL* optional -> "void*"
# lpOverlapped : OVERLAPPED* optional -> "void*"
# lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional -> "void*"
# lpHandle : HANDLE* optional, 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。

const std = @import("std");

extern "ws2_32" fn GetAddrInfoExW(
    pName: [*c]const u16, // LPCWSTR optional
    pServiceName: [*c]const u16, // LPCWSTR optional
    dwNameSpace: u32, // DWORD
    lpNspId: [*c]GUID, // GUID* optional
    hints: [*c]ADDRINFOEXW, // ADDRINFOEXW* optional
    ppResult: [*c][*c]ADDRINFOEXW, // ADDRINFOEXW** out
    timeout: [*c]TIMEVAL, // TIMEVAL* optional
    lpOverlapped: [*c]OVERLAPPED, // OVERLAPPED* optional
    lpCompletionRoutine: ?*anyopaque, // LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
    lpHandle: ?*anyopaque // HANDLE* optional, out
) callconv(std.os.windows.WINAPI) i32;
// Unicode(-W): UTF-16LE のヌル終端バッファ([*c]const u16)を渡す。

proc GetAddrInfoExW(
    pName: WideCString,  # LPCWSTR optional
    pServiceName: WideCString,  # LPCWSTR optional
    dwNameSpace: uint32,  # DWORD
    lpNspId: ptr GUID,  # GUID* optional
    hints: ptr ADDRINFOEXW,  # ADDRINFOEXW* optional
    ppResult: ptr ADDRINFOEXW,  # ADDRINFOEXW** out
    timeout: ptr TIMEVAL,  # TIMEVAL* optional
    lpOverlapped: ptr OVERLAPPED,  # OVERLAPPED* optional
    lpCompletionRoutine: pointer,  # LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
    lpHandle: pointer  # HANDLE* optional, out
): int32 {.importc: "GetAddrInfoExW", stdcall, dynlib: "WS2_32.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "ws2_32");
extern(Windows)
int GetAddrInfoExW(
    const(wchar)* pName,   // LPCWSTR optional
    const(wchar)* pServiceName,   // LPCWSTR optional
    uint dwNameSpace,   // DWORD
    GUID* lpNspId,   // GUID* optional
    ADDRINFOEXW* hints,   // ADDRINFOEXW* optional
    ADDRINFOEXW** ppResult,   // ADDRINFOEXW** out
    TIMEVAL* timeout,   // TIMEVAL* optional
    OVERLAPPED* lpOverlapped,   // OVERLAPPED* optional
    void* lpCompletionRoutine,   // LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
    void* lpHandle   // HANDLE* optional, out
);

ccall((:GetAddrInfoExW, "WS2_32.dll"), stdcall, Int32,
      (Cwstring, Cwstring, UInt32, Ptr{GUID}, Ptr{ADDRINFOEXW}, Ptr{ADDRINFOEXW}, Ptr{TIMEVAL}, Ptr{OVERLAPPED}, Ptr{Cvoid}, Ptr{Cvoid}),
      pName, pServiceName, dwNameSpace, lpNspId, hints, ppResult, timeout, lpOverlapped, lpCompletionRoutine, lpHandle)
# pName : LPCWSTR optional -> Cwstring
# pServiceName : LPCWSTR optional -> Cwstring
# dwNameSpace : DWORD -> UInt32
# lpNspId : GUID* optional -> Ptr{GUID}
# hints : ADDRINFOEXW* optional -> Ptr{ADDRINFOEXW}
# ppResult : ADDRINFOEXW** out -> Ptr{ADDRINFOEXW}
# timeout : TIMEVAL* optional -> Ptr{TIMEVAL}
# lpOverlapped : OVERLAPPED* optional -> Ptr{OVERLAPPED}
# lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional -> Ptr{Cvoid}
# lpHandle : HANDLE* optional, out -> Ptr{Cvoid}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。
# Unicode(-W): Cwstring には transcode(UInt16, "...") 等で UTF-16 を渡す。

local ffi = require("ffi")
ffi.cdef[[
int32_t GetAddrInfoExW(
    const uint16_t* pName,
    const uint16_t* pServiceName,
    uint32_t dwNameSpace,
    void* lpNspId,
    void* hints,
    void* ppResult,
    void* timeout,
    void* lpOverlapped,
    void* lpCompletionRoutine,
    void* lpHandle);
]]
local ws2_32 = ffi.load("ws2_32")
-- ws2_32.GetAddrInfoExW(pName, pServiceName, dwNameSpace, lpNspId, hints, ppResult, timeout, lpOverlapped, lpCompletionRoutine, lpHandle)
-- pName : LPCWSTR optional
-- pServiceName : LPCWSTR optional
-- dwNameSpace : DWORD
-- lpNspId : GUID* optional
-- hints : ADDRINFOEXW* optional
-- ppResult : ADDRINFOEXW** out
-- timeout : TIMEVAL* optional
-- lpOverlapped : OVERLAPPED* optional
-- lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
-- lpHandle : HANDLE* optional, out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
-- Unicode(-W): uint16_t* には UTF-16LE のバッファ(ffi.new("uint16_t[?]", ...))を渡す。

const koffi = require('koffi');
const lib = koffi.load('WS2_32.dll');
const GetAddrInfoExW = lib.func('__stdcall', 'GetAddrInfoExW', 'int32_t', ['str16', 'str16', 'uint32_t', 'void *', 'void *', 'void *', 'void *', 'void *', 'void *', 'void *']);
// GetAddrInfoExW(pName, pServiceName, dwNameSpace, lpNspId, hints, ppResult, timeout, lpOverlapped, lpCompletionRoutine, lpHandle)
// pName : LPCWSTR optional -> 'str16'
// pServiceName : LPCWSTR optional -> 'str16'
// dwNameSpace : DWORD -> 'uint32_t'
// lpNspId : GUID* optional -> 'void *'
// hints : ADDRINFOEXW* optional -> 'void *'
// ppResult : ADDRINFOEXW** out -> 'void *'
// timeout : TIMEVAL* optional -> 'void *'
// lpOverlapped : OVERLAPPED* optional -> 'void *'
// lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional -> 'void *'
// lpHandle : HANDLE* optional, out -> 'void *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。
// コールバック(関数ポインタ)は koffi.proto/koffi.register で型を定義して渡す(素の void* では JS 関数を渡せない)。

const lib = Deno.dlopen("WS2_32.dll", {
  GetAddrInfoExW: { parameters: ["buffer", "buffer", "u32", "pointer", "pointer", "pointer", "pointer", "pointer", "pointer", "pointer"], result: "i32" },
});
// lib.symbols.GetAddrInfoExW(pName, pServiceName, dwNameSpace, lpNspId, hints, ppResult, timeout, lpOverlapped, lpCompletionRoutine, lpHandle)
// pName : LPCWSTR optional -> "buffer"
// pServiceName : LPCWSTR optional -> "buffer"
// dwNameSpace : DWORD -> "u32"
// lpNspId : GUID* optional -> "pointer"
// hints : ADDRINFOEXW* optional -> "pointer"
// ppResult : ADDRINFOEXW** out -> "pointer"
// timeout : TIMEVAL* optional -> "pointer"
// lpOverlapped : OVERLAPPED* optional -> "pointer"
// lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional -> "pointer"
// lpHandle : HANDLE* optional, out -> "pointer"
// 文字列は "buffer"。Unicode(-W) は new TextEncoder() ではなく UTF-16LE のバイト列(末尾に \x00\x00)を Uint8Array で渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t GetAddrInfoExW(
    const uint16_t* pName,
    const uint16_t* pServiceName,
    uint32_t dwNameSpace,
    void* lpNspId,
    void* hints,
    void* ppResult,
    void* timeout,
    void* lpOverlapped,
    void* lpCompletionRoutine,
    void* lpHandle);
C, "WS2_32.dll");
// $ffi->GetAddrInfoExW(pName, pServiceName, dwNameSpace, lpNspId, hints, ppResult, timeout, lpOverlapped, lpCompletionRoutine, lpHandle);
// pName : LPCWSTR optional
// pServiceName : LPCWSTR optional
// dwNameSpace : DWORD
// lpNspId : GUID* optional
// hints : ADDRINFOEXW* optional
// ppResult : ADDRINFOEXW** out
// timeout : TIMEVAL* optional
// lpOverlapped : OVERLAPPED* optional
// lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
// lpHandle : HANDLE* optional, out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Ws2_32 extends StdCallLibrary {
    Ws2_32 INSTANCE = Native.load("ws2_32", Ws2_32.class, W32APIOptions.UNICODE_OPTIONS);
    int GetAddrInfoExW(
        WString pName,   // LPCWSTR optional
        WString pServiceName,   // LPCWSTR optional
        int dwNameSpace,   // DWORD
        Pointer lpNspId,   // GUID* optional
        Pointer hints,   // ADDRINFOEXW* optional
        Pointer ppResult,   // ADDRINFOEXW** out
        Pointer timeout,   // TIMEVAL* optional
        Pointer lpOverlapped,   // OVERLAPPED* optional
        Callback lpCompletionRoutine,   // LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
        Pointer lpHandle   // HANDLE* optional, out
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("ws2_32")]
lib LibWS2_32
  fun GetAddrInfoExW = GetAddrInfoExW(
    pName : UInt16*,   # LPCWSTR optional
    pServiceName : UInt16*,   # LPCWSTR optional
    dwNameSpace : UInt32,   # DWORD
    lpNspId : GUID*,   # GUID* optional
    hints : ADDRINFOEXW*,   # ADDRINFOEXW* optional
    ppResult : ADDRINFOEXW**,   # ADDRINFOEXW** out
    timeout : TIMEVAL*,   # TIMEVAL* optional
    lpOverlapped : OVERLAPPED*,   # OVERLAPPED* optional
    lpCompletionRoutine : Void*,   # LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
    lpHandle : Void*   # HANDLE* optional, out
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef GetAddrInfoExWNative = Int32 Function(Pointer<Utf16>, Pointer<Utf16>, Uint32, Pointer<Void>, Pointer<Void>, Pointer<Void>, Pointer<Void>, Pointer<Void>, Pointer<Void>, Pointer<Void>);
typedef GetAddrInfoExWDart = int Function(Pointer<Utf16>, Pointer<Utf16>, int, Pointer<Void>, Pointer<Void>, Pointer<Void>, Pointer<Void>, Pointer<Void>, Pointer<Void>, Pointer<Void>);
final GetAddrInfoExW = DynamicLibrary.open('WS2_32.dll')
    .lookupFunction<GetAddrInfoExWNative, GetAddrInfoExWDart>('GetAddrInfoExW');
// pName : LPCWSTR optional -> Pointer<Utf16>
// pServiceName : LPCWSTR optional -> Pointer<Utf16>
// dwNameSpace : DWORD -> Uint32
// lpNspId : GUID* optional -> Pointer<Void>
// hints : ADDRINFOEXW* optional -> Pointer<Void>
// ppResult : ADDRINFOEXW** out -> Pointer<Void>
// timeout : TIMEVAL* optional -> Pointer<Void>
// lpOverlapped : OVERLAPPED* optional -> Pointer<Void>
// lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional -> Pointer<Void>
// lpHandle : HANDLE* optional, out -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GetAddrInfoExW(
  pName: PWideChar;   // LPCWSTR optional
  pServiceName: PWideChar;   // LPCWSTR optional
  dwNameSpace: DWORD;   // DWORD
  lpNspId: PGUID;   // GUID* optional
  hints: Pointer;   // ADDRINFOEXW* optional
  ppResult: Pointer;   // ADDRINFOEXW** out
  timeout: Pointer;   // TIMEVAL* optional
  lpOverlapped: Pointer;   // OVERLAPPED* optional
  lpCompletionRoutine: Pointer;   // LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
  lpHandle: Pointer   // HANDLE* optional, out
): Integer; stdcall;
  external 'WS2_32.dll' name 'GetAddrInfoExW';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "GetAddrInfoExW"
  c_GetAddrInfoExW :: CWString -> CWString -> Word32 -> Ptr () -> Ptr () -> Ptr () -> Ptr () -> Ptr () -> Ptr () -> Ptr () -> IO Int32
-- pName : LPCWSTR optional -> CWString
-- pServiceName : LPCWSTR optional -> CWString
-- dwNameSpace : DWORD -> Word32
-- lpNspId : GUID* optional -> Ptr ()
-- hints : ADDRINFOEXW* optional -> Ptr ()
-- ppResult : ADDRINFOEXW** out -> Ptr ()
-- timeout : TIMEVAL* optional -> Ptr ()
-- lpOverlapped : OVERLAPPED* optional -> Ptr ()
-- lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional -> Ptr ()
-- lpHandle : HANDLE* optional, out -> Ptr ()
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let getaddrinfoexw =
  foreign "GetAddrInfoExW"
    ((ptr uint16_t) @-> (ptr uint16_t) @-> uint32_t @-> (ptr void) @-> (ptr void) @-> (ptr void) @-> (ptr void) @-> (ptr void) @-> (ptr void) @-> (ptr void) @-> returning int32_t)
(* pName : LPCWSTR optional -> (ptr uint16_t) *)
(* pServiceName : LPCWSTR optional -> (ptr uint16_t) *)
(* dwNameSpace : DWORD -> uint32_t *)
(* lpNspId : GUID* optional -> (ptr void) *)
(* hints : ADDRINFOEXW* optional -> (ptr void) *)
(* ppResult : ADDRINFOEXW** out -> (ptr void) *)
(* timeout : TIMEVAL* optional -> (ptr void) *)
(* lpOverlapped : OVERLAPPED* optional -> (ptr void) *)
(* lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional -> (ptr void) *)
(* lpHandle : HANDLE* optional, out -> (ptr void) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library ws2_32 (t "WS2_32.dll"))
(cffi:use-foreign-library ws2_32)

(cffi:defcfun ("GetAddrInfoExW" get-addr-info-ex-w :convention :stdcall) :int32
  (p-name (:string :encoding :utf-16le))   ; LPCWSTR optional
  (p-service-name (:string :encoding :utf-16le))   ; LPCWSTR optional
  (dw-name-space :uint32)   ; DWORD
  (lp-nsp-id :pointer)   ; GUID* optional
  (hints :pointer)   ; ADDRINFOEXW* optional
  (pp-result :pointer)   ; ADDRINFOEXW** out
  (timeout :pointer)   ; TIMEVAL* optional
  (lp-overlapped :pointer)   ; OVERLAPPED* optional
  (lp-completion-routine :pointer)   ; LPLOOKUPSERVICE_COMPLETION_ROUTINE optional
  (lp-handle :pointer))   ; HANDLE* optional, out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $GetAddrInfoExW = Win32::API::More->new('WS2_32',
    'int GetAddrInfoExW(LPCWSTR pName, LPCWSTR pServiceName, DWORD dwNameSpace, LPVOID lpNspId, LPVOID hints, LPVOID ppResult, LPVOID timeout, LPVOID lpOverlapped, LPVOID lpCompletionRoutine, HANDLE lpHandle)');
# my $ret = $GetAddrInfoExW->Call($pName, $pServiceName, $dwNameSpace, $lpNspId, $hints, $ppResult, $timeout, $lpOverlapped, $lpCompletionRoutine, $lpHandle);
# pName : LPCWSTR optional -> LPCWSTR
# pServiceName : LPCWSTR optional -> LPCWSTR
# dwNameSpace : DWORD -> DWORD
# lpNspId : GUID* optional -> LPVOID
# hints : ADDRINFOEXW* optional -> LPVOID
# ppResult : ADDRINFOEXW** out -> LPVOID
# timeout : TIMEVAL* optional -> LPVOID
# lpOverlapped : OVERLAPPED* optional -> LPVOID
# lpCompletionRoutine : LPLOOKUPSERVICE_COMPLETION_ROUTINE optional -> LPVOID
# lpHandle : HANDLE* optional, out -> HANDLE
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。
# コールバック(関数ポインタ)は Perl sub を直接渡せません。Win32::API::Callback を使用してください。
# Unicode(-W): LPCWSTR/LPWSTR は Win32::API が UTF-16 変換を行う。