GetVolumeInformationA

// KERNEL32.dll  (ANSI / -A)
#include <windows.h>

BOOL GetVolumeInformationA(
    LPCSTR lpRootPathName,   // optional
    LPSTR lpVolumeNameBuffer,   // optional
    DWORD nVolumeNameSize,
    DWORD* lpVolumeSerialNumber,   // optional
    DWORD* lpMaximumComponentLength,   // optional
    DWORD* lpFileSystemFlags,   // optional
    LPSTR lpFileSystemNameBuffer,   // optional
    DWORD nFileSystemNameSize
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetVolumeInformationA(
    <MarshalAs(UnmanagedType.LPStr)> lpRootPathName As String,   ' LPCSTR optional
    <MarshalAs(UnmanagedType.LPStr)> lpVolumeNameBuffer As System.Text.StringBuilder,   ' LPSTR 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.LPStr)> lpFileSystemNameBuffer As System.Text.StringBuilder,   ' LPSTR optional, out
    nFileSystemNameSize As UInteger   ' DWORD
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' lpRootPathName : LPCSTR optional
' lpVolumeNameBuffer : LPSTR optional, out
' nVolumeNameSize : DWORD
' lpVolumeSerialNumber : DWORD* optional, out
' lpMaximumComponentLength : DWORD* optional, out
' lpFileSystemFlags : DWORD* optional, out
' lpFileSystemNameBuffer : LPSTR optional, out
' nFileSystemNameSize : DWORD
Declare PtrSafe Function GetVolumeInformationA Lib "kernel32" ( _
    ByVal lpRootPathName As String, _
    ByVal lpVolumeNameBuffer As String, _
    ByVal nVolumeNameSize As Long, _
    ByVal lpVolumeSerialNumber As LongPtr, _
    ByVal lpMaximumComponentLength As LongPtr, _
    ByVal lpFileSystemFlags As LongPtr, _
    ByVal lpFileSystemNameBuffer As String, _
    ByVal nFileSystemNameSize 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

GetVolumeInformationA = ctypes.windll.kernel32.GetVolumeInformationA
GetVolumeInformationA.restype = wintypes.BOOL
GetVolumeInformationA.argtypes = [
    wintypes.LPCSTR,  # lpRootPathName : LPCSTR optional
    wintypes.LPSTR,  # lpVolumeNameBuffer : LPSTR 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.LPSTR,  # lpFileSystemNameBuffer : LPSTR 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')
GetVolumeInformationA = Fiddle::Function.new(
  lib['GetVolumeInformationA'],
  [
    Fiddle::TYPE_VOIDP,  # lpRootPathName : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # lpVolumeNameBuffer : LPSTR 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 : LPSTR optional, out
    -Fiddle::TYPE_INT,  # nFileSystemNameSize : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn GetVolumeInformationA(
        lpRootPathName: *const u8,  // LPCSTR optional
        lpVolumeNameBuffer: *mut u8,  // LPSTR 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 u8,  // LPSTR 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.Ansi, SetLastError = true)]
public static extern bool GetVolumeInformationA([MarshalAs(UnmanagedType.LPStr)] string lpRootPathName, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpVolumeNameBuffer, uint nVolumeNameSize, IntPtr lpVolumeSerialNumber, IntPtr lpMaximumComponentLength, IntPtr lpFileSystemFlags, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpFileSystemNameBuffer, uint nFileSystemNameSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_GetVolumeInformationA' -Namespace Win32 -PassThru
# $api::GetVolumeInformationA(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize)

#uselib "KERNEL32.dll"
#func global GetVolumeInformationA "GetVolumeInformationA" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; GetVolumeInformationA lpRootPathName, varptr(lpVolumeNameBuffer), nVolumeNameSize, varptr(lpVolumeSerialNumber), varptr(lpMaximumComponentLength), varptr(lpFileSystemFlags), varptr(lpFileSystemNameBuffer), nFileSystemNameSize   ; 戻り値は stat
; lpRootPathName : LPCSTR optional -> "sptr"
; lpVolumeNameBuffer : LPSTR optional, out -> "sptr"
; nVolumeNameSize : DWORD -> "sptr"
; lpVolumeSerialNumber : DWORD* optional, out -> "sptr"
; lpMaximumComponentLength : DWORD* optional, out -> "sptr"
; lpFileSystemFlags : DWORD* optional, out -> "sptr"
; lpFileSystemNameBuffer : LPSTR optional, out -> "sptr"
; nFileSystemNameSize : DWORD -> "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")
	procGetVolumeInformationA = kernel32.NewProc("GetVolumeInformationA")
)

// lpRootPathName (LPCSTR optional), lpVolumeNameBuffer (LPSTR optional, out), nVolumeNameSize (DWORD), lpVolumeSerialNumber (DWORD* optional, out), lpMaximumComponentLength (DWORD* optional, out), lpFileSystemFlags (DWORD* optional, out), lpFileSystemNameBuffer (LPSTR optional, out), nFileSystemNameSize (DWORD)
r1, _, err := procGetVolumeInformationA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(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 GetVolumeInformationA(
  lpRootPathName: PAnsiChar;   // LPCSTR optional
  lpVolumeNameBuffer: PAnsiChar;   // LPSTR optional, out
  nVolumeNameSize: DWORD;   // DWORD
  lpVolumeSerialNumber: Pointer;   // DWORD* optional, out
  lpMaximumComponentLength: Pointer;   // DWORD* optional, out
  lpFileSystemFlags: Pointer;   // DWORD* optional, out
  lpFileSystemNameBuffer: PAnsiChar;   // LPSTR optional, out
  nFileSystemNameSize: DWORD   // DWORD
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'GetVolumeInformationA';

result := DllCall("KERNEL32\GetVolumeInformationA"
    , "AStr", lpRootPathName   ; LPCSTR optional
    , "Ptr", lpVolumeNameBuffer   ; LPSTR optional, out
    , "UInt", nVolumeNameSize   ; DWORD
    , "Ptr", lpVolumeSerialNumber   ; DWORD* optional, out
    , "Ptr", lpMaximumComponentLength   ; DWORD* optional, out
    , "Ptr", lpFileSystemFlags   ; DWORD* optional, out
    , "Ptr", lpFileSystemNameBuffer   ; LPSTR optional, out
    , "UInt", nFileSystemNameSize   ; DWORD
    , "Int")   ; return: BOOL

●GetVolumeInformationA(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize) = DLL("KERNEL32.dll", "bool GetVolumeInformationA(char*, char*, dword, void*, void*, void*, char*, dword)")
# 呼び出し: GetVolumeInformationA(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize)
# lpRootPathName : LPCSTR optional -> "char*"
# lpVolumeNameBuffer : LPSTR optional, out -> "char*"
# nVolumeNameSize : DWORD -> "dword"
# lpVolumeSerialNumber : DWORD* optional, out -> "void*"
# lpMaximumComponentLength : DWORD* optional, out -> "void*"
# lpFileSystemFlags : DWORD* optional, out -> "void*"
# lpFileSystemNameBuffer : LPSTR 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)。

const std = @import("std");

extern "kernel32" fn GetVolumeInformationA(
    lpRootPathName: [*c]const u8, // LPCSTR optional
    lpVolumeNameBuffer: [*c]u8, // LPSTR 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]u8, // LPSTR optional, out
    nFileSystemNameSize: u32 // DWORD
) callconv(std.os.windows.WINAPI) i32;

proc GetVolumeInformationA(
    lpRootPathName: cstring,  # LPCSTR optional
    lpVolumeNameBuffer: ptr char,  # LPSTR 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 char,  # LPSTR optional, out
    nFileSystemNameSize: uint32  # DWORD
): int32 {.importc: "GetVolumeInformationA", stdcall, dynlib: "KERNEL32.dll".}

pragma(lib, "kernel32");
extern(Windows)
int GetVolumeInformationA(
    const(char)* lpRootPathName,   // LPCSTR optional
    char* lpVolumeNameBuffer,   // LPSTR optional, out
    uint nVolumeNameSize,   // DWORD
    uint* lpVolumeSerialNumber,   // DWORD* optional, out
    uint* lpMaximumComponentLength,   // DWORD* optional, out
    uint* lpFileSystemFlags,   // DWORD* optional, out
    char* lpFileSystemNameBuffer,   // LPSTR optional, out
    uint nFileSystemNameSize   // DWORD
);

ccall((:GetVolumeInformationA, "KERNEL32.dll"), stdcall, Int32,
      (Cstring, Ptr{UInt8}, UInt32, Ptr{UInt32}, Ptr{UInt32}, Ptr{UInt32}, Ptr{UInt8}, UInt32),
      lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize)
# lpRootPathName : LPCSTR optional -> Cstring
# lpVolumeNameBuffer : LPSTR optional, out -> Ptr{UInt8}
# nVolumeNameSize : DWORD -> UInt32
# lpVolumeSerialNumber : DWORD* optional, out -> Ptr{UInt32}
# lpMaximumComponentLength : DWORD* optional, out -> Ptr{UInt32}
# lpFileSystemFlags : DWORD* optional, out -> Ptr{UInt32}
# lpFileSystemNameBuffer : LPSTR optional, out -> Ptr{UInt8}
# nFileSystemNameSize : DWORD -> UInt32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t GetVolumeInformationA(
    const char* lpRootPathName,
    char* lpVolumeNameBuffer,
    uint32_t nVolumeNameSize,
    uint32_t* lpVolumeSerialNumber,
    uint32_t* lpMaximumComponentLength,
    uint32_t* lpFileSystemFlags,
    char* lpFileSystemNameBuffer,
    uint32_t nFileSystemNameSize);
]]
local kernel32 = ffi.load("kernel32")
-- kernel32.GetVolumeInformationA(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize)
-- lpRootPathName : LPCSTR optional
-- lpVolumeNameBuffer : LPSTR optional, out
-- nVolumeNameSize : DWORD
-- lpVolumeSerialNumber : DWORD* optional, out
-- lpMaximumComponentLength : DWORD* optional, out
-- lpFileSystemFlags : DWORD* optional, out
-- lpFileSystemNameBuffer : LPSTR 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。

const koffi = require('koffi');
const lib = koffi.load('KERNEL32.dll');
const GetVolumeInformationA = lib.func('__stdcall', 'GetVolumeInformationA', 'int32_t', ['str', 'char *', 'uint32_t', 'uint32_t *', 'uint32_t *', 'uint32_t *', 'char *', 'uint32_t']);
// GetVolumeInformationA(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize)
// lpRootPathName : LPCSTR optional -> 'str'
// lpVolumeNameBuffer : LPSTR optional, out -> 'char *'
// nVolumeNameSize : DWORD -> 'uint32_t'
// lpVolumeSerialNumber : DWORD* optional, out -> 'uint32_t *'
// lpMaximumComponentLength : DWORD* optional, out -> 'uint32_t *'
// lpFileSystemFlags : DWORD* optional, out -> 'uint32_t *'
// lpFileSystemNameBuffer : LPSTR optional, out -> 'char *'
// 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", {
  GetVolumeInformationA: { parameters: ["buffer", "buffer", "u32", "pointer", "pointer", "pointer", "buffer", "u32"], result: "i32" },
});
// lib.symbols.GetVolumeInformationA(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize)
// lpRootPathName : LPCSTR optional -> "buffer"
// lpVolumeNameBuffer : LPSTR optional, out -> "buffer"
// nVolumeNameSize : DWORD -> "u32"
// lpVolumeSerialNumber : DWORD* optional, out -> "pointer"
// lpMaximumComponentLength : DWORD* optional, out -> "pointer"
// lpFileSystemFlags : DWORD* optional, out -> "pointer"
// lpFileSystemNameBuffer : LPSTR optional, out -> "buffer"
// nFileSystemNameSize : DWORD -> "u32"
// 文字列は "buffer"。ANSI(-A) は new TextEncoder() で UTF-8/ANSI バイト列(末尾に \x00)を渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t GetVolumeInformationA(
    const char* lpRootPathName,
    char* lpVolumeNameBuffer,
    uint32_t nVolumeNameSize,
    uint32_t* lpVolumeSerialNumber,
    uint32_t* lpMaximumComponentLength,
    uint32_t* lpFileSystemFlags,
    char* lpFileSystemNameBuffer,
    uint32_t nFileSystemNameSize);
C, "KERNEL32.dll");
// $ffi->GetVolumeInformationA(lpRootPathName, lpVolumeNameBuffer, nVolumeNameSize, lpVolumeSerialNumber, lpMaximumComponentLength, lpFileSystemFlags, lpFileSystemNameBuffer, nFileSystemNameSize);
// lpRootPathName : LPCSTR optional
// lpVolumeNameBuffer : LPSTR optional, out
// nVolumeNameSize : DWORD
// lpVolumeSerialNumber : DWORD* optional, out
// lpMaximumComponentLength : DWORD* optional, out
// lpFileSystemFlags : DWORD* optional, out
// lpFileSystemNameBuffer : LPSTR 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.ASCII_OPTIONS);
    boolean GetVolumeInformationA(
        String lpRootPathName,   // LPCSTR optional
        byte[] lpVolumeNameBuffer,   // LPSTR optional, out
        int nVolumeNameSize,   // DWORD
        IntByReference lpVolumeSerialNumber,   // DWORD* optional, out
        IntByReference lpMaximumComponentLength,   // DWORD* optional, out
        IntByReference lpFileSystemFlags,   // DWORD* optional, out
        byte[] lpFileSystemNameBuffer,   // LPSTR optional, out
        int nFileSystemNameSize   // DWORD
    );
}

@[Link("kernel32")]
lib LibKERNEL32
  fun GetVolumeInformationA = GetVolumeInformationA(
    lpRootPathName : UInt8*,   # LPCSTR optional
    lpVolumeNameBuffer : UInt8*,   # LPSTR optional, out
    nVolumeNameSize : UInt32,   # DWORD
    lpVolumeSerialNumber : UInt32*,   # DWORD* optional, out
    lpMaximumComponentLength : UInt32*,   # DWORD* optional, out
    lpFileSystemFlags : UInt32*,   # DWORD* optional, out
    lpFileSystemNameBuffer : UInt8*,   # LPSTR 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 GetVolumeInformationANative = Int32 Function(Pointer<Utf8>, Pointer<Utf8>, Uint32, Pointer<Uint32>, Pointer<Uint32>, Pointer<Uint32>, Pointer<Utf8>, Uint32);
typedef GetVolumeInformationADart = int Function(Pointer<Utf8>, Pointer<Utf8>, int, Pointer<Uint32>, Pointer<Uint32>, Pointer<Uint32>, Pointer<Utf8>, int);
final GetVolumeInformationA = DynamicLibrary.open('KERNEL32.dll')
    .lookupFunction<GetVolumeInformationANative, GetVolumeInformationADart>('GetVolumeInformationA');
// lpRootPathName : LPCSTR optional -> Pointer<Utf8>
// lpVolumeNameBuffer : LPSTR optional, out -> Pointer<Utf8>
// nVolumeNameSize : DWORD -> Uint32
// lpVolumeSerialNumber : DWORD* optional, out -> Pointer<Uint32>
// lpMaximumComponentLength : DWORD* optional, out -> Pointer<Uint32>
// lpFileSystemFlags : DWORD* optional, out -> Pointer<Uint32>
// lpFileSystemNameBuffer : LPSTR optional, out -> Pointer<Utf8>
// nFileSystemNameSize : DWORD -> Uint32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

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

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

foreign import stdcall safe "GetVolumeInformationA"
  c_GetVolumeInformationA :: CString -> CString -> Word32 -> Ptr Word32 -> Ptr Word32 -> Ptr Word32 -> CString -> Word32 -> IO CInt
-- lpRootPathName : LPCSTR optional -> CString
-- lpVolumeNameBuffer : LPSTR optional, out -> CString
-- nVolumeNameSize : DWORD -> Word32
-- lpVolumeSerialNumber : DWORD* optional, out -> Ptr Word32
-- lpMaximumComponentLength : DWORD* optional, out -> Ptr Word32
-- lpFileSystemFlags : DWORD* optional, out -> Ptr Word32
-- lpFileSystemNameBuffer : LPSTR optional, out -> CString
-- 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 getvolumeinformationa =
  foreign "GetVolumeInformationA"
    (string @-> string @-> uint32_t @-> (ptr uint32_t) @-> (ptr uint32_t) @-> (ptr uint32_t) @-> string @-> uint32_t @-> returning int32_t)
(* lpRootPathName : LPCSTR optional -> string *)
(* lpVolumeNameBuffer : LPSTR optional, out -> string *)
(* 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 : LPSTR optional, out -> string *)
(* 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 ("GetVolumeInformationA" get-volume-information-a :convention :stdcall) :int32
  (lp-root-path-name :string)   ; LPCSTR optional
  (lp-volume-name-buffer :pointer)   ; LPSTR 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)   ; LPSTR 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 $GetVolumeInformationA = Win32::API::More->new('KERNEL32',
    'BOOL GetVolumeInformationA(LPCSTR lpRootPathName, LPSTR lpVolumeNameBuffer, DWORD nVolumeNameSize, LPVOID lpVolumeSerialNumber, LPVOID lpMaximumComponentLength, LPVOID lpFileSystemFlags, LPSTR lpFileSystemNameBuffer, DWORD nFileSystemNameSize)');
# my $ret = $GetVolumeInformationA->Call($lpRootPathName, $lpVolumeNameBuffer, $nVolumeNameSize, $lpVolumeSerialNumber, $lpMaximumComponentLength, $lpFileSystemFlags, $lpFileSystemNameBuffer, $nFileSystemNameSize);
# lpRootPathName : LPCSTR optional -> LPCSTR
# lpVolumeNameBuffer : LPSTR optional, out -> LPSTR
# nVolumeNameSize : DWORD -> DWORD
# lpVolumeSerialNumber : DWORD* optional, out -> LPVOID
# lpMaximumComponentLength : DWORD* optional, out -> LPVOID
# lpFileSystemFlags : DWORD* optional, out -> LPVOID
# lpFileSystemNameBuffer : LPSTR optional, out -> LPSTR
# 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。