GetVolumeInformationW

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

BOOL GetVolumeInformationW(
    LPCWSTR lpRootPathName,   // optional
    LPWSTR lpVolumeNameBuffer,   // optional
    DWORD nVolumeNameSize,
    DWORD* lpVolumeSerialNumber,   // optional
    DWORD* lpMaximumComponentLength,   // optional
    DWORD* lpFileSystemFlags,   // optional
    LPWSTR lpFileSystemNameBuffer,   // optional
    DWORD nFileSystemNameSize
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetVolumeInformationW(
    <MarshalAs(UnmanagedType.LPWStr)> lpRootPathName As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> lpVolumeNameBuffer As System.Text.StringBuilder,   ' LPWSTR optional, out
    nVolumeNameSize As UInteger,   ' DWORD
    lpVolumeSerialNumber As IntPtr,   ' DWORD* optional, out
    lpMaximumComponentLength As IntPtr,   ' DWORD* optional, out
    lpFileSystemFlags As IntPtr,   ' DWORD* optional, out
    <MarshalAs(UnmanagedType.LPWStr)> lpFileSystemNameBuffer As System.Text.StringBuilder,   ' LPWSTR optional, out
    nFileSystemNameSize As UInteger   ' DWORD
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' lpRootPathName : LPCWSTR optional
' lpVolumeNameBuffer : LPWSTR optional, out
' nVolumeNameSize : DWORD
' lpVolumeSerialNumber : DWORD* optional, out
' lpMaximumComponentLength : DWORD* optional, out
' lpFileSystemFlags : DWORD* optional, out
' lpFileSystemNameBuffer : LPWSTR optional, out
' nFileSystemNameSize : DWORD
Declare PtrSafe Function GetVolumeInformationW Lib "kernel32" ( _
    ByVal lpRootPathName As LongPtr, _
    ByVal lpVolumeNameBuffer As LongPtr, _
    ByVal nVolumeNameSize As Long, _
    ByVal lpVolumeSerialNumber As LongPtr, _
    ByVal lpMaximumComponentLength As LongPtr, _
    ByVal lpFileSystemFlags As LongPtr, _
    ByVal lpFileSystemNameBuffer As LongPtr, _
    ByVal nFileSystemNameSize As Long) 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

GetVolumeInformationW = ctypes.windll.kernel32.GetVolumeInformationW
GetVolumeInformationW.restype = wintypes.BOOL
GetVolumeInformationW.argtypes = [
    wintypes.LPCWSTR,  # lpRootPathName : LPCWSTR optional
    wintypes.LPWSTR,  # lpVolumeNameBuffer : LPWSTR optional, out
    wintypes.DWORD,  # nVolumeNameSize : DWORD
    ctypes.POINTER(wintypes.DWORD),  # lpVolumeSerialNumber : DWORD* optional, out
    ctypes.POINTER(wintypes.DWORD),  # lpMaximumComponentLength : DWORD* optional, out
    ctypes.POINTER(wintypes.DWORD),  # lpFileSystemFlags : DWORD* optional, out
    wintypes.LPWSTR,  # lpFileSystemNameBuffer : LPWSTR optional, out
    wintypes.DWORD,  # nFileSystemNameSize : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
GetVolumeInformationW = Fiddle::Function.new(
  lib['GetVolumeInformationW'],
  [
    Fiddle::TYPE_VOIDP,  # lpRootPathName : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # lpVolumeNameBuffer : LPWSTR optional, out
    -Fiddle::TYPE_INT,  # nVolumeNameSize : DWORD
    Fiddle::TYPE_VOIDP,  # lpVolumeSerialNumber : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # lpMaximumComponentLength : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # lpFileSystemFlags : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # lpFileSystemNameBuffer : LPWSTR optional, out
    -Fiddle::TYPE_INT,  # nFileSystemNameSize : DWORD
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn GetVolumeInformationW(
        lpRootPathName: *const u16,  // LPCWSTR optional
        lpVolumeNameBuffer: *mut u16,  // LPWSTR optional, out
        nVolumeNameSize: u32,  // DWORD
        lpVolumeSerialNumber: *mut u32,  // DWORD* optional, out
        lpMaximumComponentLength: *mut u32,  // DWORD* optional, out
        lpFileSystemFlags: *mut u32,  // DWORD* optional, out
        lpFileSystemNameBuffer: *mut u16,  // LPWSTR optional, out
        nFileSystemNameSize: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool GetVolumeInformationW([MarshalAs(UnmanagedType.LPWStr)] string lpRootPathName, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpVolumeNameBuffer, uint nVolumeNameSize, IntPtr lpVolumeSerialNumber, IntPtr lpMaximumComponentLength, IntPtr lpFileSystemFlags, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpFileSystemNameBuffer, uint nFileSystemNameSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetVolumeInformationW' -Namespace Win32 -PassThru
# $api::GetVolumeInformationW(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize)

#uselib "KERNEL32.dll"
#func global GetVolumeInformationW "GetVolumeInformationW" wptr, wptr, wptr, wptr, wptr, wptr, wptr, wptr
; GetVolumeInformationW lpRootPathName, varptr(lpVolumeNameBuffer), nVolumeNameSize, varptr(lpVolumeSerialNumber), varptr(lpMaximumComponentLength), varptr(lpFileSystemFlags), varptr(lpFileSystemNameBuffer), nFileSystemNameSize   ; 戻り値は stat
; lpRootPathName : LPCWSTR optional -> "wptr"
; lpVolumeNameBuffer : LPWSTR optional, out -> "wptr"
; nVolumeNameSize : DWORD -> "wptr"
; lpVolumeSerialNumber : DWORD* optional, out -> "wptr"
; lpMaximumComponentLength : DWORD* optional, out -> "wptr"
; lpFileSystemFlags : DWORD* optional, out -> "wptr"
; lpFileSystemNameBuffer : LPWSTR optional, out -> "wptr"
; nFileSystemNameSize : DWORD -> "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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procGetVolumeInformationW = kernel32.NewProc("GetVolumeInformationW")
)

// lpRootPathName (LPCWSTR optional), lpVolumeNameBuffer (LPWSTR optional, out), nVolumeNameSize (DWORD), lpVolumeSerialNumber (DWORD* optional, out), lpMaximumComponentLength (DWORD* optional, out), lpFileSystemFlags (DWORD* optional, out), lpFileSystemNameBuffer (LPWSTR optional, out), nFileSystemNameSize (DWORD)
r1, _, err := procGetVolumeInformationW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpRootPathName))),
	uintptr(lpVolumeNameBuffer),
	uintptr(nVolumeNameSize),
	uintptr(lpVolumeSerialNumber),
	uintptr(lpMaximumComponentLength),
	uintptr(lpFileSystemFlags),
	uintptr(lpFileSystemNameBuffer),
	uintptr(nFileSystemNameSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetVolumeInformationW(
  lpRootPathName: PWideChar;   // LPCWSTR optional
  lpVolumeNameBuffer: PWideChar;   // LPWSTR optional, out
  nVolumeNameSize: DWORD;   // DWORD
  lpVolumeSerialNumber: Pointer;   // DWORD* optional, out
  lpMaximumComponentLength: Pointer;   // DWORD* optional, out
  lpFileSystemFlags: Pointer;   // DWORD* optional, out
  lpFileSystemNameBuffer: PWideChar;   // LPWSTR optional, out
  nFileSystemNameSize: DWORD   // DWORD
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'GetVolumeInformationW';

result := DllCall("KERNEL32\GetVolumeInformationW"
    , "WStr", lpRootPathName   ; LPCWSTR optional
    , "Ptr", lpVolumeNameBuffer   ; LPWSTR optional, out
    , "UInt", nVolumeNameSize   ; DWORD
    , "Ptr", lpVolumeSerialNumber   ; DWORD* optional, out
    , "Ptr", lpMaximumComponentLength   ; DWORD* optional, out
    , "Ptr", lpFileSystemFlags   ; DWORD* optional, out
    , "Ptr", lpFileSystemNameBuffer   ; LPWSTR optional, out
    , "UInt", nFileSystemNameSize   ; DWORD
    , "Int")   ; return: BOOL

●GetVolumeInformationW(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize) = DLL("KERNEL32.dll", "bool GetVolumeInformationW(char*, char*, dword, void*, void*, void*, char*, dword)")
# 呼び出し: GetVolumeInformationW(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize)
# lpRootPathName : LPCWSTR optional -> "char*"
# lpVolumeNameBuffer : LPWSTR optional, out -> "char*"
# nVolumeNameSize : DWORD -> "dword"
# lpVolumeSerialNumber : DWORD* optional, out -> "void*"
# lpMaximumComponentLength : DWORD* optional, out -> "void*"
# lpFileSystemFlags : DWORD* optional, out -> "void*"
# lpFileSystemNameBuffer : LPWSTR optional, out -> "char*"
# nFileSystemNameSize : DWORD -> "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 GetVolumeInformationW(
    lpRootPathName: [*c]const u16, // LPCWSTR optional
    lpVolumeNameBuffer: [*c]u16, // LPWSTR optional, out
    nVolumeNameSize: u32, // DWORD
    lpVolumeSerialNumber: [*c]u32, // DWORD* optional, out
    lpMaximumComponentLength: [*c]u32, // DWORD* optional, out
    lpFileSystemFlags: [*c]u32, // DWORD* optional, out
    lpFileSystemNameBuffer: [*c]u16, // LPWSTR optional, out
    nFileSystemNameSize: u32 // DWORD
) 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 GetVolumeInformationW(
    lpRootPathName: WideCString,  # LPCWSTR optional
    lpVolumeNameBuffer: ptr uint16,  # LPWSTR optional, out
    nVolumeNameSize: uint32,  # DWORD
    lpVolumeSerialNumber: ptr uint32,  # DWORD* optional, out
    lpMaximumComponentLength: ptr uint32,  # DWORD* optional, out
    lpFileSystemFlags: ptr uint32,  # DWORD* optional, out
    lpFileSystemNameBuffer: ptr uint16,  # LPWSTR optional, out
    nFileSystemNameSize: uint32  # DWORD
): int32 {.importc: "GetVolumeInformationW", stdcall, dynlib: "KERNEL32.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "kernel32");
extern(Windows)
int GetVolumeInformationW(
    const(wchar)* lpRootPathName,   // LPCWSTR optional
    wchar* lpVolumeNameBuffer,   // LPWSTR optional, out
    uint nVolumeNameSize,   // DWORD
    uint* lpVolumeSerialNumber,   // DWORD* optional, out
    uint* lpMaximumComponentLength,   // DWORD* optional, out
    uint* lpFileSystemFlags,   // DWORD* optional, out
    wchar* lpFileSystemNameBuffer,   // LPWSTR optional, out
    uint nFileSystemNameSize   // DWORD
);

ccall((:GetVolumeInformationW, "KERNEL32.dll"), stdcall, Int32,
      (Cwstring, Ptr{UInt16}, UInt32, Ptr{UInt32}, Ptr{UInt32}, Ptr{UInt32}, Ptr{UInt16}, UInt32),
      lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize)
# lpRootPathName : LPCWSTR optional -> Cwstring
# lpVolumeNameBuffer : LPWSTR optional, out -> Ptr{UInt16}
# nVolumeNameSize : DWORD -> UInt32
# lpVolumeSerialNumber : DWORD* optional, out -> Ptr{UInt32}
# lpMaximumComponentLength : DWORD* optional, out -> Ptr{UInt32}
# lpFileSystemFlags : DWORD* optional, out -> Ptr{UInt32}
# lpFileSystemNameBuffer : LPWSTR optional, out -> Ptr{UInt16}
# nFileSystemNameSize : DWORD -> 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[[
int32_t GetVolumeInformationW(
    const uint16_t* lpRootPathName,
    uint16_t* lpVolumeNameBuffer,
    uint32_t nVolumeNameSize,
    uint32_t* lpVolumeSerialNumber,
    uint32_t* lpMaximumComponentLength,
    uint32_t* lpFileSystemFlags,
    uint16_t* lpFileSystemNameBuffer,
    uint32_t nFileSystemNameSize);
]]
local kernel32 = ffi.load("kernel32")
-- kernel32.GetVolumeInformationW(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize)
-- lpRootPathName : LPCWSTR optional
-- lpVolumeNameBuffer : LPWSTR optional, out
-- nVolumeNameSize : DWORD
-- lpVolumeSerialNumber : DWORD* optional, out
-- lpMaximumComponentLength : DWORD* optional, out
-- lpFileSystemFlags : DWORD* optional, out
-- lpFileSystemNameBuffer : LPWSTR optional, out
-- nFileSystemNameSize : DWORD
-- 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 GetVolumeInformationW = lib.func('__stdcall', 'GetVolumeInformationW', 'int32_t', ['str16', 'uint16_t *', 'uint32_t', 'uint32_t *', 'uint32_t *', 'uint32_t *', 'uint16_t *', 'uint32_t']);
// GetVolumeInformationW(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize)
// lpRootPathName : LPCWSTR optional -> 'str16'
// lpVolumeNameBuffer : LPWSTR optional, out -> 'uint16_t *'
// nVolumeNameSize : DWORD -> 'uint32_t'
// lpVolumeSerialNumber : DWORD* optional, out -> 'uint32_t *'
// lpMaximumComponentLength : DWORD* optional, out -> 'uint32_t *'
// lpFileSystemFlags : DWORD* optional, out -> 'uint32_t *'
// lpFileSystemNameBuffer : LPWSTR optional, out -> 'uint16_t *'
// nFileSystemNameSize : DWORD -> '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", {
  GetVolumeInformationW: { parameters: ["buffer", "buffer", "u32", "pointer", "pointer", "pointer", "buffer", "u32"], result: "i32" },
});
// lib.symbols.GetVolumeInformationW(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize)
// lpRootPathName : LPCWSTR optional -> "buffer"
// lpVolumeNameBuffer : LPWSTR optional, out -> "buffer"
// nVolumeNameSize : DWORD -> "u32"
// lpVolumeSerialNumber : DWORD* optional, out -> "pointer"
// lpMaximumComponentLength : DWORD* optional, out -> "pointer"
// lpFileSystemFlags : DWORD* optional, out -> "pointer"
// lpFileSystemNameBuffer : LPWSTR optional, out -> "buffer"
// nFileSystemNameSize : DWORD -> "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
int32_t GetVolumeInformationW(
    const uint16_t* lpRootPathName,
    uint16_t* lpVolumeNameBuffer,
    uint32_t nVolumeNameSize,
    uint32_t* lpVolumeSerialNumber,
    uint32_t* lpMaximumComponentLength,
    uint32_t* lpFileSystemFlags,
    uint16_t* lpFileSystemNameBuffer,
    uint32_t nFileSystemNameSize);
C, "KERNEL32.dll");
// $ffi->GetVolumeInformationW(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize);
// lpRootPathName : LPCWSTR optional
// lpVolumeNameBuffer : LPWSTR optional, out
// nVolumeNameSize : DWORD
// lpVolumeSerialNumber : DWORD* optional, out
// lpMaximumComponentLength : DWORD* optional, out
// lpFileSystemFlags : DWORD* optional, out
// lpFileSystemNameBuffer : LPWSTR optional, out
// nFileSystemNameSize : DWORD
// 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);
    boolean GetVolumeInformationW(
        WString lpRootPathName,   // LPCWSTR optional
        char[] lpVolumeNameBuffer,   // LPWSTR optional, out
        int nVolumeNameSize,   // DWORD
        IntByReference lpVolumeSerialNumber,   // DWORD* optional, out
        IntByReference lpMaximumComponentLength,   // DWORD* optional, out
        IntByReference lpFileSystemFlags,   // DWORD* optional, out
        char[] lpFileSystemNameBuffer,   // LPWSTR optional, out
        int nFileSystemNameSize   // DWORD
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("kernel32")]
lib LibKERNEL32
  fun GetVolumeInformationW = GetVolumeInformationW(
    lpRootPathName : UInt16*,   # LPCWSTR optional
    lpVolumeNameBuffer : UInt16*,   # LPWSTR optional, out
    nVolumeNameSize : UInt32,   # DWORD
    lpVolumeSerialNumber : UInt32*,   # DWORD* optional, out
    lpMaximumComponentLength : UInt32*,   # DWORD* optional, out
    lpFileSystemFlags : UInt32*,   # DWORD* optional, out
    lpFileSystemNameBuffer : UInt16*,   # LPWSTR optional, out
    nFileSystemNameSize : UInt32   # DWORD
  ) : 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 GetVolumeInformationWNative = Int32 Function(Pointer<Utf16>, Pointer<Utf16>, Uint32, Pointer<Uint32>, Pointer<Uint32>, Pointer<Uint32>, Pointer<Utf16>, Uint32);
typedef GetVolumeInformationWDart = int Function(Pointer<Utf16>, Pointer<Utf16>, int, Pointer<Uint32>, Pointer<Uint32>, Pointer<Uint32>, Pointer<Utf16>, int);
final GetVolumeInformationW = DynamicLibrary.open('KERNEL32.dll')
    .lookupFunction<GetVolumeInformationWNative, GetVolumeInformationWDart>('GetVolumeInformationW');
// lpRootPathName : LPCWSTR optional -> Pointer<Utf16>
// lpVolumeNameBuffer : LPWSTR optional, out -> Pointer<Utf16>
// nVolumeNameSize : DWORD -> Uint32
// lpVolumeSerialNumber : DWORD* optional, out -> Pointer<Uint32>
// lpMaximumComponentLength : DWORD* optional, out -> Pointer<Uint32>
// lpFileSystemFlags : DWORD* optional, out -> Pointer<Uint32>
// lpFileSystemNameBuffer : LPWSTR optional, out -> Pointer<Utf16>
// nFileSystemNameSize : DWORD -> Uint32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GetVolumeInformationW(
  lpRootPathName: PWideChar;   // LPCWSTR optional
  lpVolumeNameBuffer: PWideChar;   // LPWSTR optional, out
  nVolumeNameSize: DWORD;   // DWORD
  lpVolumeSerialNumber: Pointer;   // DWORD* optional, out
  lpMaximumComponentLength: Pointer;   // DWORD* optional, out
  lpFileSystemFlags: Pointer;   // DWORD* optional, out
  lpFileSystemNameBuffer: PWideChar;   // LPWSTR optional, out
  nFileSystemNameSize: DWORD   // DWORD
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'GetVolumeInformationW';

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

foreign import stdcall safe "GetVolumeInformationW"
  c_GetVolumeInformationW :: CWString -> CWString -> Word32 -> Ptr Word32 -> Ptr Word32 -> Ptr Word32 -> CWString -> Word32 -> IO CInt
-- lpRootPathName : LPCWSTR optional -> CWString
-- lpVolumeNameBuffer : LPWSTR optional, out -> CWString
-- nVolumeNameSize : DWORD -> Word32
-- lpVolumeSerialNumber : DWORD* optional, out -> Ptr Word32
-- lpMaximumComponentLength : DWORD* optional, out -> Ptr Word32
-- lpFileSystemFlags : DWORD* optional, out -> Ptr Word32
-- lpFileSystemNameBuffer : LPWSTR optional, out -> CWString
-- nFileSystemNameSize : DWORD -> 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 getvolumeinformationw =
  foreign "GetVolumeInformationW"
    ((ptr uint16_t) @-> (ptr uint16_t) @-> uint32_t @-> (ptr uint32_t) @-> (ptr uint32_t) @-> (ptr uint32_t) @-> (ptr uint16_t) @-> uint32_t @-> returning int32_t)
(* lpRootPathName : LPCWSTR optional -> (ptr uint16_t) *)
(* lpVolumeNameBuffer : LPWSTR optional, out -> (ptr uint16_t) *)
(* nVolumeNameSize : DWORD -> uint32_t *)
(* lpVolumeSerialNumber : DWORD* optional, out -> (ptr uint32_t) *)
(* lpMaximumComponentLength : DWORD* optional, out -> (ptr uint32_t) *)
(* lpFileSystemFlags : DWORD* optional, out -> (ptr uint32_t) *)
(* lpFileSystemNameBuffer : LPWSTR optional, out -> (ptr uint16_t) *)
(* nFileSystemNameSize : DWORD -> 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 ("GetVolumeInformationW" get-volume-information-w :convention :stdcall) :int32
  (lp-root-path-name (:string :encoding :utf-16le))   ; LPCWSTR optional
  (lp-volume-name-buffer :pointer)   ; LPWSTR optional, out
  (n-volume-name-size :uint32)   ; DWORD
  (lp-volume-serial-number :pointer)   ; DWORD* optional, out
  (lp-maximum-component-length :pointer)   ; DWORD* optional, out
  (lp-file-system-flags :pointer)   ; DWORD* optional, out
  (lp-file-system-name-buffer :pointer)   ; LPWSTR optional, out
  (n-file-system-name-size :uint32))   ; DWORD
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $GetVolumeInformationW = Win32::API::More->new('KERNEL32',
    'BOOL GetVolumeInformationW(LPCWSTR lpRootPathName, LPWSTR lpVolumeNameBuffer, DWORD nVolumeNameSize, LPVOID lpVolumeSerialNumber, LPVOID lpMaximumComponentLength, LPVOID lpFileSystemFlags, LPWSTR lpFileSystemNameBuffer, DWORD nFileSystemNameSize)');
# my $ret = $GetVolumeInformationW->Call($lpRootPathName, $lpVolumeNameBuffer, $nVolumeNameSize, $lpVolumeSerialNumber, $lpMaximumComponentLength, $lpFileSystemFlags, $lpFileSystemNameBuffer, $nFileSystemNameSize);
# lpRootPathName : LPCWSTR optional -> LPCWSTR
# lpVolumeNameBuffer : LPWSTR optional, out -> LPWSTR
# nVolumeNameSize : DWORD -> DWORD
# lpVolumeSerialNumber : DWORD* optional, out -> LPVOID
# lpMaximumComponentLength : DWORD* optional, out -> LPVOID
# lpFileSystemFlags : DWORD* optional, out -> LPVOID
# lpFileSystemNameBuffer : LPWSTR optional, out -> LPWSTR
# nFileSystemNameSize : DWORD -> 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。