FindFirstChangeNotificationW

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

HANDLE FindFirstChangeNotificationW(
    LPCWSTR lpPathName,
    BOOL bWatchSubtree,
    FILE_NOTIFY_CHANGE dwNotifyFilter
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function FindFirstChangeNotificationW(
    <MarshalAs(UnmanagedType.LPWStr)> lpPathName As String,   ' LPCWSTR
    bWatchSubtree As Boolean,   ' BOOL
    dwNotifyFilter As UInteger   ' FILE_NOTIFY_CHANGE
) As IntPtr
End Function

' lpPathName : LPCWSTR
' bWatchSubtree : BOOL
' dwNotifyFilter : FILE_NOTIFY_CHANGE
Declare PtrSafe Function FindFirstChangeNotificationW Lib "kernel32" ( _
    ByVal lpPathName As LongPtr, _
    ByVal bWatchSubtree As Long, _
    ByVal dwNotifyFilter As Long) As LongPtr
' 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

FindFirstChangeNotificationW = ctypes.windll.kernel32.FindFirstChangeNotificationW
FindFirstChangeNotificationW.restype = ctypes.c_void_p
FindFirstChangeNotificationW.argtypes = [
    wintypes.LPCWSTR,  # lpPathName : LPCWSTR
    wintypes.BOOL,  # bWatchSubtree : BOOL
    wintypes.DWORD,  # dwNotifyFilter : FILE_NOTIFY_CHANGE
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
FindFirstChangeNotificationW = Fiddle::Function.new(
  lib['FindFirstChangeNotificationW'],
  [
    Fiddle::TYPE_VOIDP,  # lpPathName : LPCWSTR
    Fiddle::TYPE_INT,  # bWatchSubtree : BOOL
    -Fiddle::TYPE_INT,  # dwNotifyFilter : FILE_NOTIFY_CHANGE
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn FindFirstChangeNotificationW(
        lpPathName: *const u16,  // LPCWSTR
        bWatchSubtree: i32,  // BOOL
        dwNotifyFilter: u32  // FILE_NOTIFY_CHANGE
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr FindFirstChangeNotificationW([MarshalAs(UnmanagedType.LPWStr)] string lpPathName, bool bWatchSubtree, uint dwNotifyFilter);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_FindFirstChangeNotificationW' -Namespace Win32 -PassThru
# $api::FindFirstChangeNotificationW(lpPathName, bWatchSubtree, dwNotifyFilter)

#uselib "KERNEL32.dll"
#func global FindFirstChangeNotificationW "FindFirstChangeNotificationW" wptr, wptr, wptr
; FindFirstChangeNotificationW lpPathName, bWatchSubtree, dwNotifyFilter   ; 戻り値は stat
; lpPathName : LPCWSTR -> "wptr"
; bWatchSubtree : BOOL -> "wptr"
; dwNotifyFilter : FILE_NOTIFY_CHANGE -> "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 "KERNEL32.dll"
#cfunc global FindFirstChangeNotificationW "FindFirstChangeNotificationW" wstr, int, int
; res = FindFirstChangeNotificationW(lpPathName, bWatchSubtree, dwNotifyFilter)
; lpPathName : LPCWSTR -> "wstr"
; bWatchSubtree : BOOL -> "int"
; dwNotifyFilter : FILE_NOTIFY_CHANGE -> "int"

; HANDLE FindFirstChangeNotificationW(LPCWSTR lpPathName, BOOL bWatchSubtree, FILE_NOTIFY_CHANGE dwNotifyFilter)
#uselib "KERNEL32.dll"
#cfunc global FindFirstChangeNotificationW "FindFirstChangeNotificationW" wstr, int, int
; res = FindFirstChangeNotificationW(lpPathName, bWatchSubtree, dwNotifyFilter)
; lpPathName : LPCWSTR -> "wstr"
; bWatchSubtree : BOOL -> "int"
; dwNotifyFilter : FILE_NOTIFY_CHANGE -> "int"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procFindFirstChangeNotificationW = kernel32.NewProc("FindFirstChangeNotificationW")
)

// lpPathName (LPCWSTR), bWatchSubtree (BOOL), dwNotifyFilter (FILE_NOTIFY_CHANGE)
r1, _, err := procFindFirstChangeNotificationW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpPathName))),
	uintptr(bWatchSubtree),
	uintptr(dwNotifyFilter),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HANDLE

function FindFirstChangeNotificationW(
  lpPathName: PWideChar;   // LPCWSTR
  bWatchSubtree: BOOL;   // BOOL
  dwNotifyFilter: DWORD   // FILE_NOTIFY_CHANGE
): THandle; stdcall;
  external 'KERNEL32.dll' name 'FindFirstChangeNotificationW';

result := DllCall("KERNEL32\FindFirstChangeNotificationW"
    , "WStr", lpPathName   ; LPCWSTR
    , "Int", bWatchSubtree   ; BOOL
    , "UInt", dwNotifyFilter   ; FILE_NOTIFY_CHANGE
    , "Ptr")   ; return: HANDLE

●FindFirstChangeNotificationW(lpPathName, bWatchSubtree, dwNotifyFilter) = DLL("KERNEL32.dll", "void* FindFirstChangeNotificationW(char*, bool, dword)")
# 呼び出し: FindFirstChangeNotificationW(lpPathName, bWatchSubtree, dwNotifyFilter)
# lpPathName : LPCWSTR -> "char*"
# bWatchSubtree : BOOL -> "bool"
# dwNotifyFilter : FILE_NOTIFY_CHANGE -> "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。

const std = @import("std");

extern "kernel32" fn FindFirstChangeNotificationW(
    lpPathName: [*c]const u16, // LPCWSTR
    bWatchSubtree: i32, // BOOL
    dwNotifyFilter: u32 // FILE_NOTIFY_CHANGE
) callconv(std.os.windows.WINAPI) ?*anyopaque;
// Unicode(-W): UTF-16LE のヌル終端バッファ([*c]const u16)を渡す。

proc FindFirstChangeNotificationW(
    lpPathName: WideCString,  # LPCWSTR
    bWatchSubtree: int32,  # BOOL
    dwNotifyFilter: uint32  # FILE_NOTIFY_CHANGE
): pointer {.importc: "FindFirstChangeNotificationW", stdcall, dynlib: "KERNEL32.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "kernel32");
extern(Windows)
void* FindFirstChangeNotificationW(
    const(wchar)* lpPathName,   // LPCWSTR
    int bWatchSubtree,   // BOOL
    uint dwNotifyFilter   // FILE_NOTIFY_CHANGE
);

ccall((:FindFirstChangeNotificationW, "KERNEL32.dll"), stdcall, Ptr{Cvoid},
      (Cwstring, Int32, UInt32),
      lpPathName, bWatchSubtree, dwNotifyFilter)
# lpPathName : LPCWSTR -> Cwstring
# bWatchSubtree : BOOL -> Int32
# dwNotifyFilter : FILE_NOTIFY_CHANGE -> UInt32
# 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[[
void* FindFirstChangeNotificationW(
    const uint16_t* lpPathName,
    int32_t bWatchSubtree,
    uint32_t dwNotifyFilter);
]]
local kernel32 = ffi.load("kernel32")
-- kernel32.FindFirstChangeNotificationW(lpPathName, bWatchSubtree, dwNotifyFilter)
-- lpPathName : LPCWSTR
-- bWatchSubtree : BOOL
-- dwNotifyFilter : FILE_NOTIFY_CHANGE
-- 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('KERNEL32.dll');
const FindFirstChangeNotificationW = lib.func('__stdcall', 'FindFirstChangeNotificationW', 'void *', ['str16', 'int32_t', 'uint32_t']);
// FindFirstChangeNotificationW(lpPathName, bWatchSubtree, dwNotifyFilter)
// lpPathName : LPCWSTR -> 'str16'
// bWatchSubtree : BOOL -> 'int32_t'
// dwNotifyFilter : FILE_NOTIFY_CHANGE -> 'uint32_t'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("KERNEL32.dll", {
  FindFirstChangeNotificationW: { parameters: ["buffer", "i32", "u32"], result: "pointer" },
});
// lib.symbols.FindFirstChangeNotificationW(lpPathName, bWatchSubtree, dwNotifyFilter)
// lpPathName : LPCWSTR -> "buffer"
// bWatchSubtree : BOOL -> "i32"
// dwNotifyFilter : FILE_NOTIFY_CHANGE -> "u32"
// 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
void* FindFirstChangeNotificationW(
    const uint16_t* lpPathName,
    int32_t bWatchSubtree,
    uint32_t dwNotifyFilter);
C, "KERNEL32.dll");
// $ffi->FindFirstChangeNotificationW(lpPathName, bWatchSubtree, dwNotifyFilter);
// lpPathName : LPCWSTR
// bWatchSubtree : BOOL
// dwNotifyFilter : FILE_NOTIFY_CHANGE
// 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, W32APIOptions.UNICODE_OPTIONS);
    Pointer FindFirstChangeNotificationW(
        WString lpPathName,   // LPCWSTR
        boolean bWatchSubtree,   // BOOL
        int dwNotifyFilter   // FILE_NOTIFY_CHANGE
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("kernel32")]
lib LibKERNEL32
  fun FindFirstChangeNotificationW = FindFirstChangeNotificationW(
    lpPathName : UInt16*,   # LPCWSTR
    bWatchSubtree : Int32,   # BOOL
    dwNotifyFilter : UInt32   # FILE_NOTIFY_CHANGE
  ) : Void*
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 FindFirstChangeNotificationWNative = Pointer<Void> Function(Pointer<Utf16>, Int32, Uint32);
typedef FindFirstChangeNotificationWDart = Pointer<Void> Function(Pointer<Utf16>, int, int);
final FindFirstChangeNotificationW = DynamicLibrary.open('KERNEL32.dll')
    .lookupFunction<FindFirstChangeNotificationWNative, FindFirstChangeNotificationWDart>('FindFirstChangeNotificationW');
// lpPathName : LPCWSTR -> Pointer<Utf16>
// bWatchSubtree : BOOL -> Int32
// dwNotifyFilter : FILE_NOTIFY_CHANGE -> Uint32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function FindFirstChangeNotificationW(
  lpPathName: PWideChar;   // LPCWSTR
  bWatchSubtree: BOOL;   // BOOL
  dwNotifyFilter: DWORD   // FILE_NOTIFY_CHANGE
): THandle; stdcall;
  external 'KERNEL32.dll' name 'FindFirstChangeNotificationW';

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

foreign import stdcall safe "FindFirstChangeNotificationW"
  c_FindFirstChangeNotificationW :: CWString -> CInt -> Word32 -> IO (Ptr ())
-- lpPathName : LPCWSTR -> CWString
-- bWatchSubtree : BOOL -> CInt
-- dwNotifyFilter : FILE_NOTIFY_CHANGE -> Word32
-- 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 findfirstchangenotificationw =
  foreign "FindFirstChangeNotificationW"
    ((ptr uint16_t) @-> int32_t @-> uint32_t @-> returning (ptr void))
(* lpPathName : LPCWSTR -> (ptr uint16_t) *)
(* bWatchSubtree : BOOL -> int32_t *)
(* dwNotifyFilter : FILE_NOTIFY_CHANGE -> uint32_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 ("FindFirstChangeNotificationW" find-first-change-notification-w :convention :stdcall) :pointer
  (lp-path-name (:string :encoding :utf-16le))   ; LPCWSTR
  (b-watch-subtree :int32)   ; BOOL
  (dw-notify-filter :uint32))   ; FILE_NOTIFY_CHANGE
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $FindFirstChangeNotificationW = Win32::API::More->new('KERNEL32',
    'HANDLE FindFirstChangeNotificationW(LPCWSTR lpPathName, BOOL bWatchSubtree, DWORD dwNotifyFilter)');
# my $ret = $FindFirstChangeNotificationW->Call($lpPathName, $bWatchSubtree, $dwNotifyFilter);
# lpPathName : LPCWSTR -> LPCWSTR
# bWatchSubtree : BOOL -> BOOL
# dwNotifyFilter : FILE_NOTIFY_CHANGE -> DWORD
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。
# Unicode(-W): LPCWSTR/LPWSTR は Win32::API が UTF-16 変換を行う。