FindFirstFileNameW

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

HANDLE FindFirstFileNameW(
    LPCWSTR lpFileName,
    DWORD dwFlags,
    DWORD* StringLength,
    LPWSTR LinkName
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function FindFirstFileNameW(
    <MarshalAs(UnmanagedType.LPWStr)> lpFileName As String,   ' LPCWSTR
    dwFlags As UInteger,   ' DWORD
    ByRef StringLength As UInteger,   ' DWORD* in/out
    <MarshalAs(UnmanagedType.LPWStr)> LinkName As System.Text.StringBuilder   ' LPWSTR out
) As IntPtr
End Function

' lpFileName : LPCWSTR
' dwFlags : DWORD
' StringLength : DWORD* in/out
' LinkName : LPWSTR out
Declare PtrSafe Function FindFirstFileNameW Lib "kernel32" ( _
    ByVal lpFileName As LongPtr, _
    ByVal dwFlags As Long, _
    ByRef StringLength As Long, _
    ByVal LinkName As LongPtr) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

FindFirstFileNameW = ctypes.windll.kernel32.FindFirstFileNameW
FindFirstFileNameW.restype = ctypes.c_void_p
FindFirstFileNameW.argtypes = [
    wintypes.LPCWSTR,  # lpFileName : LPCWSTR
    wintypes.DWORD,  # dwFlags : DWORD
    ctypes.POINTER(wintypes.DWORD),  # StringLength : DWORD* in/out
    wintypes.LPWSTR,  # LinkName : LPWSTR out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
FindFirstFileNameW = Fiddle::Function.new(
  lib['FindFirstFileNameW'],
  [
    Fiddle::TYPE_VOIDP,  # lpFileName : LPCWSTR
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # StringLength : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # LinkName : LPWSTR out
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "kernel32")]
extern "system" {
    fn FindFirstFileNameW(
        lpFileName: *const u16,  // LPCWSTR
        dwFlags: u32,  // DWORD
        StringLength: *mut u32,  // DWORD* in/out
        LinkName: *mut u16  // LPWSTR out
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern IntPtr FindFirstFileNameW([MarshalAs(UnmanagedType.LPWStr)] string lpFileName, uint dwFlags, ref uint StringLength, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder LinkName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_FindFirstFileNameW' -Namespace Win32 -PassThru
# $api::FindFirstFileNameW(lpFileName, dwFlags, StringLength, LinkName)

#uselib "KERNEL32.dll"
#func global FindFirstFileNameW "FindFirstFileNameW" sptr, sptr, sptr, sptr
; FindFirstFileNameW lpFileName, dwFlags, varptr(StringLength), varptr(LinkName)   ; 戻り値は stat
; lpFileName : LPCWSTR -> "sptr"
; dwFlags : DWORD -> "sptr"
; StringLength : DWORD* in/out -> "sptr"
; LinkName : LPWSTR 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 "KERNEL32.dll"
#cfunc global FindFirstFileNameW "FindFirstFileNameW" wstr, int, var, var
; res = FindFirstFileNameW(lpFileName, dwFlags, StringLength, LinkName)
; lpFileName : LPCWSTR -> "wstr"
; dwFlags : DWORD -> "int"
; StringLength : DWORD* in/out -> "var"
; LinkName : LPWSTR 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。

; HANDLE FindFirstFileNameW(LPCWSTR lpFileName, DWORD dwFlags, DWORD* StringLength, LPWSTR LinkName)
#uselib "KERNEL32.dll"
#cfunc global FindFirstFileNameW "FindFirstFileNameW" wstr, int, var, var
; res = FindFirstFileNameW(lpFileName, dwFlags, StringLength, LinkName)
; lpFileName : LPCWSTR -> "wstr"
; dwFlags : DWORD -> "int"
; StringLength : DWORD* in/out -> "var"
; LinkName : LPWSTR 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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procFindFirstFileNameW = kernel32.NewProc("FindFirstFileNameW")
)

// lpFileName (LPCWSTR), dwFlags (DWORD), StringLength (DWORD* in/out), LinkName (LPWSTR out)
r1, _, err := procFindFirstFileNameW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpFileName))),
	uintptr(dwFlags),
	uintptr(StringLength),
	uintptr(LinkName),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HANDLE

function FindFirstFileNameW(
  lpFileName: PWideChar;   // LPCWSTR
  dwFlags: DWORD;   // DWORD
  StringLength: Pointer;   // DWORD* in/out
  LinkName: PWideChar   // LPWSTR out
): THandle; stdcall;
  external 'KERNEL32.dll' name 'FindFirstFileNameW';

result := DllCall("KERNEL32\FindFirstFileNameW"
    , "WStr", lpFileName   ; LPCWSTR
    , "UInt", dwFlags   ; DWORD
    , "Ptr", StringLength   ; DWORD* in/out
    , "Ptr", LinkName   ; LPWSTR out
    , "Ptr")   ; return: HANDLE

●FindFirstFileNameW(lpFileName, dwFlags, StringLength, LinkName) = DLL("KERNEL32.dll", "void* FindFirstFileNameW(char*, dword, void*, char*)")
# 呼び出し: FindFirstFileNameW(lpFileName, dwFlags, StringLength, LinkName)
# lpFileName : LPCWSTR -> "char*"
# dwFlags : DWORD -> "dword"
# StringLength : DWORD* in/out -> "void*"
# LinkName : LPWSTR out -> "char*"
# 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)。