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。