ReadDirectoryChangesExW

// KERNEL32.dll
#include <windows.h>

BOOL ReadDirectoryChangesExW(
    HANDLE hDirectory,
    void* lpBuffer,
    DWORD nBufferLength,
    BOOL bWatchSubtree,
    FILE_NOTIFY_CHANGE dwNotifyFilter,
    DWORD* lpBytesReturned,   // optional
    OVERLAPPED* lpOverlapped,   // optional
    LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine,   // optional
    READ_DIRECTORY_NOTIFY_INFORMATION_CLASS ReadDirectoryNotifyInformationClass
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function ReadDirectoryChangesExW(
    hDirectory As IntPtr,   ' HANDLE
    lpBuffer As IntPtr,   ' void* out
    nBufferLength As UInteger,   ' DWORD
    bWatchSubtree As Boolean,   ' BOOL
    dwNotifyFilter As UInteger,   ' FILE_NOTIFY_CHANGE
    lpBytesReturned As IntPtr,   ' DWORD* optional, out
    lpOverlapped As IntPtr,   ' OVERLAPPED* optional, in/out
    lpCompletionRoutine As IntPtr,   ' LPOVERLAPPED_COMPLETION_ROUTINE optional
    ReadDirectoryNotifyInformationClass As Integer   ' READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' hDirectory : HANDLE
' lpBuffer : void* out
' nBufferLength : DWORD
' bWatchSubtree : BOOL
' dwNotifyFilter : FILE_NOTIFY_CHANGE
' lpBytesReturned : DWORD* optional, out
' lpOverlapped : OVERLAPPED* optional, in/out
' lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional
' ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
Declare PtrSafe Function ReadDirectoryChangesExW Lib "kernel32" ( _
    ByVal hDirectory As LongPtr, _
    ByVal lpBuffer As LongPtr, _
    ByVal nBufferLength As Long, _
    ByVal bWatchSubtree As Long, _
    ByVal dwNotifyFilter As Long, _
    ByVal lpBytesReturned As LongPtr, _
    ByVal lpOverlapped As LongPtr, _
    ByVal lpCompletionRoutine As LongPtr, _
    ByVal ReadDirectoryNotifyInformationClass 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

ReadDirectoryChangesExW = ctypes.windll.kernel32.ReadDirectoryChangesExW
ReadDirectoryChangesExW.restype = wintypes.BOOL
ReadDirectoryChangesExW.argtypes = [
    wintypes.HANDLE,  # hDirectory : HANDLE
    ctypes.POINTER(None),  # lpBuffer : void* out
    wintypes.DWORD,  # nBufferLength : DWORD
    wintypes.BOOL,  # bWatchSubtree : BOOL
    wintypes.DWORD,  # dwNotifyFilter : FILE_NOTIFY_CHANGE
    ctypes.POINTER(wintypes.DWORD),  # lpBytesReturned : DWORD* optional, out
    ctypes.c_void_p,  # lpOverlapped : OVERLAPPED* optional, in/out
    ctypes.c_void_p,  # lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional
    ctypes.c_int,  # ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
ReadDirectoryChangesExW = Fiddle::Function.new(
  lib['ReadDirectoryChangesExW'],
  [
    Fiddle::TYPE_VOIDP,  # hDirectory : HANDLE
    Fiddle::TYPE_VOIDP,  # lpBuffer : void* out
    -Fiddle::TYPE_INT,  # nBufferLength : DWORD
    Fiddle::TYPE_INT,  # bWatchSubtree : BOOL
    -Fiddle::TYPE_INT,  # dwNotifyFilter : FILE_NOTIFY_CHANGE
    Fiddle::TYPE_VOIDP,  # lpBytesReturned : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # lpOverlapped : OVERLAPPED* optional, in/out
    Fiddle::TYPE_VOIDP,  # lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional
    Fiddle::TYPE_INT,  # ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn ReadDirectoryChangesExW(
        hDirectory: *mut core::ffi::c_void,  // HANDLE
        lpBuffer: *mut (),  // void* out
        nBufferLength: u32,  // DWORD
        bWatchSubtree: i32,  // BOOL
        dwNotifyFilter: u32,  // FILE_NOTIFY_CHANGE
        lpBytesReturned: *mut u32,  // DWORD* optional, out
        lpOverlapped: *mut OVERLAPPED,  // OVERLAPPED* optional, in/out
        lpCompletionRoutine: *const core::ffi::c_void,  // LPOVERLAPPED_COMPLETION_ROUTINE optional
        ReadDirectoryNotifyInformationClass: i32  // READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern bool ReadDirectoryChangesExW(IntPtr hDirectory, IntPtr lpBuffer, uint nBufferLength, bool bWatchSubtree, uint dwNotifyFilter, IntPtr lpBytesReturned, IntPtr lpOverlapped, IntPtr lpCompletionRoutine, int ReadDirectoryNotifyInformationClass);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_ReadDirectoryChangesExW' -Namespace Win32 -PassThru
# $api::ReadDirectoryChangesExW(hDirectory, lpBuffer, nBufferLength, bWatchSubtree, dwNotifyFilter, lpBytesReturned, lpOverlapped, lpCompletionRoutine, ReadDirectoryNotifyInformationClass)

#uselib "KERNEL32.dll"
#func global ReadDirectoryChangesExW "ReadDirectoryChangesExW" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; ReadDirectoryChangesExW hDirectory, lpBuffer, nBufferLength, bWatchSubtree, dwNotifyFilter, varptr(lpBytesReturned), varptr(lpOverlapped), lpCompletionRoutine, ReadDirectoryNotifyInformationClass   ; 戻り値は stat
; hDirectory : HANDLE -> "sptr"
; lpBuffer : void* out -> "sptr"
; nBufferLength : DWORD -> "sptr"
; bWatchSubtree : BOOL -> "sptr"
; dwNotifyFilter : FILE_NOTIFY_CHANGE -> "sptr"
; lpBytesReturned : DWORD* optional, out -> "sptr"
; lpOverlapped : OVERLAPPED* optional, in/out -> "sptr"
; lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional -> "sptr"
; ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS -> "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。

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procReadDirectoryChangesExW = kernel32.NewProc("ReadDirectoryChangesExW")
)

// hDirectory (HANDLE), lpBuffer (void* out), nBufferLength (DWORD), bWatchSubtree (BOOL), dwNotifyFilter (FILE_NOTIFY_CHANGE), lpBytesReturned (DWORD* optional, out), lpOverlapped (OVERLAPPED* optional, in/out), lpCompletionRoutine (LPOVERLAPPED_COMPLETION_ROUTINE optional), ReadDirectoryNotifyInformationClass (READ_DIRECTORY_NOTIFY_INFORMATION_CLASS)
r1, _, err := procReadDirectoryChangesExW.Call(
	uintptr(hDirectory),
	uintptr(lpBuffer),
	uintptr(nBufferLength),
	uintptr(bWatchSubtree),
	uintptr(dwNotifyFilter),
	uintptr(lpBytesReturned),
	uintptr(lpOverlapped),
	uintptr(lpCompletionRoutine),
	uintptr(ReadDirectoryNotifyInformationClass),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function ReadDirectoryChangesExW(
  hDirectory: THandle;   // HANDLE
  lpBuffer: Pointer;   // void* out
  nBufferLength: DWORD;   // DWORD
  bWatchSubtree: BOOL;   // BOOL
  dwNotifyFilter: DWORD;   // FILE_NOTIFY_CHANGE
  lpBytesReturned: Pointer;   // DWORD* optional, out
  lpOverlapped: Pointer;   // OVERLAPPED* optional, in/out
  lpCompletionRoutine: Pointer;   // LPOVERLAPPED_COMPLETION_ROUTINE optional
  ReadDirectoryNotifyInformationClass: Integer   // READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'ReadDirectoryChangesExW';

result := DllCall("KERNEL32\ReadDirectoryChangesExW"
    , "Ptr", hDirectory   ; HANDLE
    , "Ptr", lpBuffer   ; void* out
    , "UInt", nBufferLength   ; DWORD
    , "Int", bWatchSubtree   ; BOOL
    , "UInt", dwNotifyFilter   ; FILE_NOTIFY_CHANGE
    , "Ptr", lpBytesReturned   ; DWORD* optional, out
    , "Ptr", lpOverlapped   ; OVERLAPPED* optional, in/out
    , "Ptr", lpCompletionRoutine   ; LPOVERLAPPED_COMPLETION_ROUTINE optional
    , "Int", ReadDirectoryNotifyInformationClass   ; READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
    , "Int")   ; return: BOOL

●ReadDirectoryChangesExW(hDirectory, lpBuffer, nBufferLength, bWatchSubtree, dwNotifyFilter, lpBytesReturned, lpOverlapped, lpCompletionRoutine, ReadDirectoryNotifyInformationClass) = DLL("KERNEL32.dll", "bool ReadDirectoryChangesExW(void*, void*, dword, bool, dword, void*, void*, void*, int)")
# 呼び出し: ReadDirectoryChangesExW(hDirectory, lpBuffer, nBufferLength, bWatchSubtree, dwNotifyFilter, lpBytesReturned, lpOverlapped, lpCompletionRoutine, ReadDirectoryNotifyInformationClass)
# hDirectory : HANDLE -> "void*"
# lpBuffer : void* out -> "void*"
# nBufferLength : DWORD -> "dword"
# bWatchSubtree : BOOL -> "bool"
# dwNotifyFilter : FILE_NOTIFY_CHANGE -> "dword"
# lpBytesReturned : DWORD* optional, out -> "void*"
# lpOverlapped : OVERLAPPED* optional, in/out -> "void*"
# lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional -> "void*"
# ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS -> "int"
# 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)。

const std = @import("std");

extern "kernel32" fn ReadDirectoryChangesExW(
    hDirectory: ?*anyopaque, // HANDLE
    lpBuffer: ?*anyopaque, // void* out
    nBufferLength: u32, // DWORD
    bWatchSubtree: i32, // BOOL
    dwNotifyFilter: u32, // FILE_NOTIFY_CHANGE
    lpBytesReturned: [*c]u32, // DWORD* optional, out
    lpOverlapped: [*c]OVERLAPPED, // OVERLAPPED* optional, in/out
    lpCompletionRoutine: ?*anyopaque, // LPOVERLAPPED_COMPLETION_ROUTINE optional
    ReadDirectoryNotifyInformationClass: i32 // READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
) callconv(std.os.windows.WINAPI) i32;

proc ReadDirectoryChangesExW(
    hDirectory: pointer,  # HANDLE
    lpBuffer: pointer,  # void* out
    nBufferLength: uint32,  # DWORD
    bWatchSubtree: int32,  # BOOL
    dwNotifyFilter: uint32,  # FILE_NOTIFY_CHANGE
    lpBytesReturned: ptr uint32,  # DWORD* optional, out
    lpOverlapped: ptr OVERLAPPED,  # OVERLAPPED* optional, in/out
    lpCompletionRoutine: pointer,  # LPOVERLAPPED_COMPLETION_ROUTINE optional
    ReadDirectoryNotifyInformationClass: int32  # READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
): int32 {.importc: "ReadDirectoryChangesExW", stdcall, dynlib: "KERNEL32.dll".}

pragma(lib, "kernel32");
extern(Windows)
int ReadDirectoryChangesExW(
    void* hDirectory,   // HANDLE
    void* lpBuffer,   // void* out
    uint nBufferLength,   // DWORD
    int bWatchSubtree,   // BOOL
    uint dwNotifyFilter,   // FILE_NOTIFY_CHANGE
    uint* lpBytesReturned,   // DWORD* optional, out
    OVERLAPPED* lpOverlapped,   // OVERLAPPED* optional, in/out
    void* lpCompletionRoutine,   // LPOVERLAPPED_COMPLETION_ROUTINE optional
    int ReadDirectoryNotifyInformationClass   // READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
);

ccall((:ReadDirectoryChangesExW, "KERNEL32.dll"), stdcall, Int32,
      (Ptr{Cvoid}, Ptr{Cvoid}, UInt32, Int32, UInt32, Ptr{UInt32}, Ptr{OVERLAPPED}, Ptr{Cvoid}, Int32),
      hDirectory, lpBuffer, nBufferLength, bWatchSubtree, dwNotifyFilter, lpBytesReturned, lpOverlapped, lpCompletionRoutine, ReadDirectoryNotifyInformationClass)
# hDirectory : HANDLE -> Ptr{Cvoid}
# lpBuffer : void* out -> Ptr{Cvoid}
# nBufferLength : DWORD -> UInt32
# bWatchSubtree : BOOL -> Int32
# dwNotifyFilter : FILE_NOTIFY_CHANGE -> UInt32
# lpBytesReturned : DWORD* optional, out -> Ptr{UInt32}
# lpOverlapped : OVERLAPPED* optional, in/out -> Ptr{OVERLAPPED}
# lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional -> Ptr{Cvoid}
# ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS -> Int32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t ReadDirectoryChangesExW(
    void* hDirectory,
    void* lpBuffer,
    uint32_t nBufferLength,
    int32_t bWatchSubtree,
    uint32_t dwNotifyFilter,
    uint32_t* lpBytesReturned,
    void* lpOverlapped,
    void* lpCompletionRoutine,
    int32_t ReadDirectoryNotifyInformationClass);
]]
local kernel32 = ffi.load("kernel32")
-- kernel32.ReadDirectoryChangesExW(hDirectory, lpBuffer, nBufferLength, bWatchSubtree, dwNotifyFilter, lpBytesReturned, lpOverlapped, lpCompletionRoutine, ReadDirectoryNotifyInformationClass)
-- hDirectory : HANDLE
-- lpBuffer : void* out
-- nBufferLength : DWORD
-- bWatchSubtree : BOOL
-- dwNotifyFilter : FILE_NOTIFY_CHANGE
-- lpBytesReturned : DWORD* optional, out
-- lpOverlapped : OVERLAPPED* optional, in/out
-- lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional
-- ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
-- 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。

const koffi = require('koffi');
const lib = koffi.load('KERNEL32.dll');
const ReadDirectoryChangesExW = lib.func('__stdcall', 'ReadDirectoryChangesExW', 'int32_t', ['void *', 'void *', 'uint32_t', 'int32_t', 'uint32_t', 'uint32_t *', 'void *', 'void *', 'int32_t']);
// ReadDirectoryChangesExW(hDirectory, lpBuffer, nBufferLength, bWatchSubtree, dwNotifyFilter, lpBytesReturned, lpOverlapped, lpCompletionRoutine, ReadDirectoryNotifyInformationClass)
// hDirectory : HANDLE -> 'void *'
// lpBuffer : void* out -> 'void *'
// nBufferLength : DWORD -> 'uint32_t'
// bWatchSubtree : BOOL -> 'int32_t'
// dwNotifyFilter : FILE_NOTIFY_CHANGE -> 'uint32_t'
// lpBytesReturned : DWORD* optional, out -> 'uint32_t *'
// lpOverlapped : OVERLAPPED* optional, in/out -> 'void *'
// lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional -> 'void *'
// ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS -> 'int32_t'
// 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("KERNEL32.dll", {
  ReadDirectoryChangesExW: { parameters: ["pointer", "pointer", "u32", "i32", "u32", "pointer", "pointer", "pointer", "i32"], result: "i32" },
});
// lib.symbols.ReadDirectoryChangesExW(hDirectory, lpBuffer, nBufferLength, bWatchSubtree, dwNotifyFilter, lpBytesReturned, lpOverlapped, lpCompletionRoutine, ReadDirectoryNotifyInformationClass)
// hDirectory : HANDLE -> "pointer"
// lpBuffer : void* out -> "pointer"
// nBufferLength : DWORD -> "u32"
// bWatchSubtree : BOOL -> "i32"
// dwNotifyFilter : FILE_NOTIFY_CHANGE -> "u32"
// lpBytesReturned : DWORD* optional, out -> "pointer"
// lpOverlapped : OVERLAPPED* optional, in/out -> "pointer"
// lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional -> "pointer"
// ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS -> "i32"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t ReadDirectoryChangesExW(
    void* hDirectory,
    void* lpBuffer,
    uint32_t nBufferLength,
    int32_t bWatchSubtree,
    uint32_t dwNotifyFilter,
    uint32_t* lpBytesReturned,
    void* lpOverlapped,
    void* lpCompletionRoutine,
    int32_t ReadDirectoryNotifyInformationClass);
C, "KERNEL32.dll");
// $ffi->ReadDirectoryChangesExW(hDirectory, lpBuffer, nBufferLength, bWatchSubtree, dwNotifyFilter, lpBytesReturned, lpOverlapped, lpCompletionRoutine, ReadDirectoryNotifyInformationClass);
// hDirectory : HANDLE
// lpBuffer : void* out
// nBufferLength : DWORD
// bWatchSubtree : BOOL
// dwNotifyFilter : FILE_NOTIFY_CHANGE
// lpBytesReturned : DWORD* optional, out
// lpOverlapped : OVERLAPPED* optional, in/out
// lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional
// ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
// 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 Kernel32 extends StdCallLibrary {
    Kernel32 INSTANCE = Native.load("kernel32", Kernel32.class);
    boolean ReadDirectoryChangesExW(
        Pointer hDirectory,   // HANDLE
        Pointer lpBuffer,   // void* out
        int nBufferLength,   // DWORD
        boolean bWatchSubtree,   // BOOL
        int dwNotifyFilter,   // FILE_NOTIFY_CHANGE
        IntByReference lpBytesReturned,   // DWORD* optional, out
        Pointer lpOverlapped,   // OVERLAPPED* optional, in/out
        Callback lpCompletionRoutine,   // LPOVERLAPPED_COMPLETION_ROUTINE optional
        int ReadDirectoryNotifyInformationClass   // READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
    );
}

@[Link("kernel32")]
lib LibKERNEL32
  fun ReadDirectoryChangesExW = ReadDirectoryChangesExW(
    hDirectory : Void*,   # HANDLE
    lpBuffer : Void*,   # void* out
    nBufferLength : UInt32,   # DWORD
    bWatchSubtree : Int32,   # BOOL
    dwNotifyFilter : UInt32,   # FILE_NOTIFY_CHANGE
    lpBytesReturned : UInt32*,   # DWORD* optional, out
    lpOverlapped : OVERLAPPED*,   # OVERLAPPED* optional, in/out
    lpCompletionRoutine : Void*,   # LPOVERLAPPED_COMPLETION_ROUTINE optional
    ReadDirectoryNotifyInformationClass : Int32   # READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
  ) : 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 ReadDirectoryChangesExWNative = Int32 Function(Pointer<Void>, Pointer<Void>, Uint32, Int32, Uint32, Pointer<Uint32>, Pointer<Void>, Pointer<Void>, Int32);
typedef ReadDirectoryChangesExWDart = int Function(Pointer<Void>, Pointer<Void>, int, int, int, Pointer<Uint32>, Pointer<Void>, Pointer<Void>, int);
final ReadDirectoryChangesExW = DynamicLibrary.open('KERNEL32.dll')
    .lookupFunction<ReadDirectoryChangesExWNative, ReadDirectoryChangesExWDart>('ReadDirectoryChangesExW');
// hDirectory : HANDLE -> Pointer<Void>
// lpBuffer : void* out -> Pointer<Void>
// nBufferLength : DWORD -> Uint32
// bWatchSubtree : BOOL -> Int32
// dwNotifyFilter : FILE_NOTIFY_CHANGE -> Uint32
// lpBytesReturned : DWORD* optional, out -> Pointer<Uint32>
// lpOverlapped : OVERLAPPED* optional, in/out -> Pointer<Void>
// lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional -> Pointer<Void>
// ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS -> Int32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function ReadDirectoryChangesExW(
  hDirectory: THandle;   // HANDLE
  lpBuffer: Pointer;   // void* out
  nBufferLength: DWORD;   // DWORD
  bWatchSubtree: BOOL;   // BOOL
  dwNotifyFilter: DWORD;   // FILE_NOTIFY_CHANGE
  lpBytesReturned: Pointer;   // DWORD* optional, out
  lpOverlapped: Pointer;   // OVERLAPPED* optional, in/out
  lpCompletionRoutine: Pointer;   // LPOVERLAPPED_COMPLETION_ROUTINE optional
  ReadDirectoryNotifyInformationClass: Integer   // READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'ReadDirectoryChangesExW';

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

foreign import stdcall safe "ReadDirectoryChangesExW"
  c_ReadDirectoryChangesExW :: Ptr () -> Ptr () -> Word32 -> CInt -> Word32 -> Ptr Word32 -> Ptr () -> Ptr () -> Int32 -> IO CInt
-- hDirectory : HANDLE -> Ptr ()
-- lpBuffer : void* out -> Ptr ()
-- nBufferLength : DWORD -> Word32
-- bWatchSubtree : BOOL -> CInt
-- dwNotifyFilter : FILE_NOTIFY_CHANGE -> Word32
-- lpBytesReturned : DWORD* optional, out -> Ptr Word32
-- lpOverlapped : OVERLAPPED* optional, in/out -> Ptr ()
-- lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional -> Ptr ()
-- ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS -> Int32
-- 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 readdirectorychangesexw =
  foreign "ReadDirectoryChangesExW"
    ((ptr void) @-> (ptr void) @-> uint32_t @-> int32_t @-> uint32_t @-> (ptr uint32_t) @-> (ptr void) @-> (ptr void) @-> int32_t @-> returning int32_t)
(* hDirectory : HANDLE -> (ptr void) *)
(* lpBuffer : void* out -> (ptr void) *)
(* nBufferLength : DWORD -> uint32_t *)
(* bWatchSubtree : BOOL -> int32_t *)
(* dwNotifyFilter : FILE_NOTIFY_CHANGE -> uint32_t *)
(* lpBytesReturned : DWORD* optional, out -> (ptr uint32_t) *)
(* lpOverlapped : OVERLAPPED* optional, in/out -> (ptr void) *)
(* lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional -> (ptr void) *)
(* ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS -> int32_t *)
(* 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 kernel32 (t "KERNEL32.dll"))
(cffi:use-foreign-library kernel32)

(cffi:defcfun ("ReadDirectoryChangesExW" read-directory-changes-ex-w :convention :stdcall) :int32
  (h-directory :pointer)   ; HANDLE
  (lp-buffer :pointer)   ; void* out
  (n-buffer-length :uint32)   ; DWORD
  (b-watch-subtree :int32)   ; BOOL
  (dw-notify-filter :uint32)   ; FILE_NOTIFY_CHANGE
  (lp-bytes-returned :pointer)   ; DWORD* optional, out
  (lp-overlapped :pointer)   ; OVERLAPPED* optional, in/out
  (lp-completion-routine :pointer)   ; LPOVERLAPPED_COMPLETION_ROUTINE optional
  (read-directory-notify-information-class :int32))   ; READ_DIRECTORY_NOTIFY_INFORMATION_CLASS
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $ReadDirectoryChangesExW = Win32::API::More->new('KERNEL32',
    'BOOL ReadDirectoryChangesExW(HANDLE hDirectory, LPVOID lpBuffer, DWORD nBufferLength, BOOL bWatchSubtree, DWORD dwNotifyFilter, LPVOID lpBytesReturned, LPVOID lpOverlapped, LPVOID lpCompletionRoutine, int ReadDirectoryNotifyInformationClass)');
# my $ret = $ReadDirectoryChangesExW->Call($hDirectory, $lpBuffer, $nBufferLength, $bWatchSubtree, $dwNotifyFilter, $lpBytesReturned, $lpOverlapped, $lpCompletionRoutine, $ReadDirectoryNotifyInformationClass);
# hDirectory : HANDLE -> HANDLE
# lpBuffer : void* out -> LPVOID
# nBufferLength : DWORD -> DWORD
# bWatchSubtree : BOOL -> BOOL
# dwNotifyFilter : FILE_NOTIFY_CHANGE -> DWORD
# lpBytesReturned : DWORD* optional, out -> LPVOID
# lpOverlapped : OVERLAPPED* optional, in/out -> LPVOID
# lpCompletionRoutine : LPOVERLAPPED_COMPLETION_ROUTINE optional -> LPVOID
# ReadDirectoryNotifyInformationClass : READ_DIRECTORY_NOTIFY_INFORMATION_CLASS -> int
# 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。