SHGetDiskFreeSpaceExW

// SHELL32.dll  (Unicode / -W)
#include <windows.h>

BOOL SHGetDiskFreeSpaceExW(
    LPCWSTR pszDirectoryName,
    ULONGLONG* pulFreeBytesAvailableToCaller,   // optional
    ULONGLONG* pulTotalNumberOfBytes,   // optional
    ULONGLONG* pulTotalNumberOfFreeBytes   // optional
);

<DllImport("SHELL32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function SHGetDiskFreeSpaceExW(
    <MarshalAs(UnmanagedType.LPWStr)> pszDirectoryName As String,   ' LPCWSTR
    pulFreeBytesAvailableToCaller As IntPtr,   ' ULONGLONG* optional, out
    pulTotalNumberOfBytes As IntPtr,   ' ULONGLONG* optional, out
    pulTotalNumberOfFreeBytes As IntPtr   ' ULONGLONG* optional, out
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' pszDirectoryName : LPCWSTR
' pulFreeBytesAvailableToCaller : ULONGLONG* optional, out
' pulTotalNumberOfBytes : ULONGLONG* optional, out
' pulTotalNumberOfFreeBytes : ULONGLONG* optional, out
Declare PtrSafe Function SHGetDiskFreeSpaceExW Lib "shell32" ( _
    ByVal pszDirectoryName As LongPtr, _
    ByVal pulFreeBytesAvailableToCaller As LongPtr, _
    ByVal pulTotalNumberOfBytes As LongPtr, _
    ByVal pulTotalNumberOfFreeBytes As LongPtr) 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

SHGetDiskFreeSpaceExW = ctypes.windll.shell32.SHGetDiskFreeSpaceExW
SHGetDiskFreeSpaceExW.restype = wintypes.BOOL
SHGetDiskFreeSpaceExW.argtypes = [
    wintypes.LPCWSTR,  # pszDirectoryName : LPCWSTR
    ctypes.POINTER(ctypes.c_ulonglong),  # pulFreeBytesAvailableToCaller : ULONGLONG* optional, out
    ctypes.POINTER(ctypes.c_ulonglong),  # pulTotalNumberOfBytes : ULONGLONG* optional, out
    ctypes.POINTER(ctypes.c_ulonglong),  # pulTotalNumberOfFreeBytes : ULONGLONG* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHELL32.dll')
SHGetDiskFreeSpaceExW = Fiddle::Function.new(
  lib['SHGetDiskFreeSpaceExW'],
  [
    Fiddle::TYPE_VOIDP,  # pszDirectoryName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pulFreeBytesAvailableToCaller : ULONGLONG* optional, out
    Fiddle::TYPE_VOIDP,  # pulTotalNumberOfBytes : ULONGLONG* optional, out
    Fiddle::TYPE_VOIDP,  # pulTotalNumberOfFreeBytes : ULONGLONG* optional, out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "shell32")]
extern "system" {
    fn SHGetDiskFreeSpaceExW(
        pszDirectoryName: *const u16,  // LPCWSTR
        pulFreeBytesAvailableToCaller: *mut u64,  // ULONGLONG* optional, out
        pulTotalNumberOfBytes: *mut u64,  // ULONGLONG* optional, out
        pulTotalNumberOfFreeBytes: *mut u64  // ULONGLONG* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("SHELL32.dll", CharSet = CharSet.Unicode)]
public static extern bool SHGetDiskFreeSpaceExW([MarshalAs(UnmanagedType.LPWStr)] string pszDirectoryName, IntPtr pulFreeBytesAvailableToCaller, IntPtr pulTotalNumberOfBytes, IntPtr pulTotalNumberOfFreeBytes);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHELL32_SHGetDiskFreeSpaceExW' -Namespace Win32 -PassThru
# $api::SHGetDiskFreeSpaceExW(pszDirectoryName, pulFreeBytesAvailableToCaller, pulTotalNumberOfBytes, pulTotalNumberOfFreeBytes)

#uselib "SHELL32.dll"
#func global SHGetDiskFreeSpaceExW "SHGetDiskFreeSpaceExW" wptr, wptr, wptr, wptr
; SHGetDiskFreeSpaceExW pszDirectoryName, varptr(pulFreeBytesAvailableToCaller), varptr(pulTotalNumberOfBytes), varptr(pulTotalNumberOfFreeBytes)   ; 戻り値は stat
; pszDirectoryName : LPCWSTR -> "wptr"
; pulFreeBytesAvailableToCaller : ULONGLONG* optional, out -> "wptr"
; pulTotalNumberOfBytes : ULONGLONG* optional, out -> "wptr"
; pulTotalNumberOfFreeBytes : ULONGLONG* optional, out -> "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 (
	shell32 = windows.NewLazySystemDLL("SHELL32.dll")
	procSHGetDiskFreeSpaceExW = shell32.NewProc("SHGetDiskFreeSpaceExW")
)

// pszDirectoryName (LPCWSTR), pulFreeBytesAvailableToCaller (ULONGLONG* optional, out), pulTotalNumberOfBytes (ULONGLONG* optional, out), pulTotalNumberOfFreeBytes (ULONGLONG* optional, out)
r1, _, err := procSHGetDiskFreeSpaceExW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszDirectoryName))),
	uintptr(pulFreeBytesAvailableToCaller),
	uintptr(pulTotalNumberOfBytes),
	uintptr(pulTotalNumberOfFreeBytes),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SHGetDiskFreeSpaceExW(
  pszDirectoryName: PWideChar;   // LPCWSTR
  pulFreeBytesAvailableToCaller: Pointer;   // ULONGLONG* optional, out
  pulTotalNumberOfBytes: Pointer;   // ULONGLONG* optional, out
  pulTotalNumberOfFreeBytes: Pointer   // ULONGLONG* optional, out
): BOOL; stdcall;
  external 'SHELL32.dll' name 'SHGetDiskFreeSpaceExW';

result := DllCall("SHELL32\SHGetDiskFreeSpaceExW"
    , "WStr", pszDirectoryName   ; LPCWSTR
    , "Ptr", pulFreeBytesAvailableToCaller   ; ULONGLONG* optional, out
    , "Ptr", pulTotalNumberOfBytes   ; ULONGLONG* optional, out
    , "Ptr", pulTotalNumberOfFreeBytes   ; ULONGLONG* optional, out
    , "Int")   ; return: BOOL

●SHGetDiskFreeSpaceExW(pszDirectoryName, pulFreeBytesAvailableToCaller, pulTotalNumberOfBytes, pulTotalNumberOfFreeBytes) = DLL("SHELL32.dll", "bool SHGetDiskFreeSpaceExW(char*, void*, void*, void*)")
# 呼び出し: SHGetDiskFreeSpaceExW(pszDirectoryName, pulFreeBytesAvailableToCaller, pulTotalNumberOfBytes, pulTotalNumberOfFreeBytes)
# pszDirectoryName : LPCWSTR -> "char*"
# pulFreeBytesAvailableToCaller : ULONGLONG* optional, out -> "void*"
# pulTotalNumberOfBytes : ULONGLONG* optional, out -> "void*"
# pulTotalNumberOfFreeBytes : ULONGLONG* optional, out -> "void*"
# 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 "shell32" fn SHGetDiskFreeSpaceExW(
    pszDirectoryName: [*c]const u16, // LPCWSTR
    pulFreeBytesAvailableToCaller: [*c]u64, // ULONGLONG* optional, out
    pulTotalNumberOfBytes: [*c]u64, // ULONGLONG* optional, out
    pulTotalNumberOfFreeBytes: [*c]u64 // ULONGLONG* optional, out
) 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 SHGetDiskFreeSpaceExW(
    pszDirectoryName: WideCString,  # LPCWSTR
    pulFreeBytesAvailableToCaller: ptr uint64,  # ULONGLONG* optional, out
    pulTotalNumberOfBytes: ptr uint64,  # ULONGLONG* optional, out
    pulTotalNumberOfFreeBytes: ptr uint64  # ULONGLONG* optional, out
): int32 {.importc: "SHGetDiskFreeSpaceExW", stdcall, dynlib: "SHELL32.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "shell32");
extern(Windows)
int SHGetDiskFreeSpaceExW(
    const(wchar)* pszDirectoryName,   // LPCWSTR
    ulong* pulFreeBytesAvailableToCaller,   // ULONGLONG* optional, out
    ulong* pulTotalNumberOfBytes,   // ULONGLONG* optional, out
    ulong* pulTotalNumberOfFreeBytes   // ULONGLONG* optional, out
);

ccall((:SHGetDiskFreeSpaceExW, "SHELL32.dll"), stdcall, Int32,
      (Cwstring, Ptr{UInt64}, Ptr{UInt64}, Ptr{UInt64}),
      pszDirectoryName, pulFreeBytesAvailableToCaller, pulTotalNumberOfBytes, pulTotalNumberOfFreeBytes)
# pszDirectoryName : LPCWSTR -> Cwstring
# pulFreeBytesAvailableToCaller : ULONGLONG* optional, out -> Ptr{UInt64}
# pulTotalNumberOfBytes : ULONGLONG* optional, out -> Ptr{UInt64}
# pulTotalNumberOfFreeBytes : ULONGLONG* optional, out -> Ptr{UInt64}
# 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 SHGetDiskFreeSpaceExW(
    const uint16_t* pszDirectoryName,
    uint64_t* pulFreeBytesAvailableToCaller,
    uint64_t* pulTotalNumberOfBytes,
    uint64_t* pulTotalNumberOfFreeBytes);
]]
local shell32 = ffi.load("shell32")
-- shell32.SHGetDiskFreeSpaceExW(pszDirectoryName, pulFreeBytesAvailableToCaller, pulTotalNumberOfBytes, pulTotalNumberOfFreeBytes)
-- pszDirectoryName : LPCWSTR
-- pulFreeBytesAvailableToCaller : ULONGLONG* optional, out
-- pulTotalNumberOfBytes : ULONGLONG* optional, out
-- pulTotalNumberOfFreeBytes : ULONGLONG* optional, out
-- 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('SHELL32.dll');
const SHGetDiskFreeSpaceExW = lib.func('__stdcall', 'SHGetDiskFreeSpaceExW', 'int32_t', ['str16', 'uint64_t *', 'uint64_t *', 'uint64_t *']);
// SHGetDiskFreeSpaceExW(pszDirectoryName, pulFreeBytesAvailableToCaller, pulTotalNumberOfBytes, pulTotalNumberOfFreeBytes)
// pszDirectoryName : LPCWSTR -> 'str16'
// pulFreeBytesAvailableToCaller : ULONGLONG* optional, out -> 'uint64_t *'
// pulTotalNumberOfBytes : ULONGLONG* optional, out -> 'uint64_t *'
// pulTotalNumberOfFreeBytes : ULONGLONG* optional, out -> 'uint64_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("SHELL32.dll", {
  SHGetDiskFreeSpaceExW: { parameters: ["buffer", "pointer", "pointer", "pointer"], result: "i32" },
});
// lib.symbols.SHGetDiskFreeSpaceExW(pszDirectoryName, pulFreeBytesAvailableToCaller, pulTotalNumberOfBytes, pulTotalNumberOfFreeBytes)
// pszDirectoryName : LPCWSTR -> "buffer"
// pulFreeBytesAvailableToCaller : ULONGLONG* optional, out -> "pointer"
// pulTotalNumberOfBytes : ULONGLONG* optional, out -> "pointer"
// pulTotalNumberOfFreeBytes : ULONGLONG* optional, out -> "pointer"
// 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 SHGetDiskFreeSpaceExW(
    const uint16_t* pszDirectoryName,
    uint64_t* pulFreeBytesAvailableToCaller,
    uint64_t* pulTotalNumberOfBytes,
    uint64_t* pulTotalNumberOfFreeBytes);
C, "SHELL32.dll");
// $ffi->SHGetDiskFreeSpaceExW(pszDirectoryName, pulFreeBytesAvailableToCaller, pulTotalNumberOfBytes, pulTotalNumberOfFreeBytes);
// pszDirectoryName : LPCWSTR
// pulFreeBytesAvailableToCaller : ULONGLONG* optional, out
// pulTotalNumberOfBytes : ULONGLONG* optional, out
// pulTotalNumberOfFreeBytes : ULONGLONG* optional, out
// 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 Shell32 extends StdCallLibrary {
    Shell32 INSTANCE = Native.load("shell32", Shell32.class, W32APIOptions.UNICODE_OPTIONS);
    boolean SHGetDiskFreeSpaceExW(
        WString pszDirectoryName,   // LPCWSTR
        LongByReference pulFreeBytesAvailableToCaller,   // ULONGLONG* optional, out
        LongByReference pulTotalNumberOfBytes,   // ULONGLONG* optional, out
        LongByReference pulTotalNumberOfFreeBytes   // ULONGLONG* optional, out
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("shell32")]
lib LibSHELL32
  fun SHGetDiskFreeSpaceExW = SHGetDiskFreeSpaceExW(
    pszDirectoryName : UInt16*,   # LPCWSTR
    pulFreeBytesAvailableToCaller : UInt64*,   # ULONGLONG* optional, out
    pulTotalNumberOfBytes : UInt64*,   # ULONGLONG* optional, out
    pulTotalNumberOfFreeBytes : UInt64*   # ULONGLONG* optional, out
  ) : 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 SHGetDiskFreeSpaceExWNative = Int32 Function(Pointer<Utf16>, Pointer<Uint64>, Pointer<Uint64>, Pointer<Uint64>);
typedef SHGetDiskFreeSpaceExWDart = int Function(Pointer<Utf16>, Pointer<Uint64>, Pointer<Uint64>, Pointer<Uint64>);
final SHGetDiskFreeSpaceExW = DynamicLibrary.open('SHELL32.dll')
    .lookupFunction<SHGetDiskFreeSpaceExWNative, SHGetDiskFreeSpaceExWDart>('SHGetDiskFreeSpaceExW');
// pszDirectoryName : LPCWSTR -> Pointer<Utf16>
// pulFreeBytesAvailableToCaller : ULONGLONG* optional, out -> Pointer<Uint64>
// pulTotalNumberOfBytes : ULONGLONG* optional, out -> Pointer<Uint64>
// pulTotalNumberOfFreeBytes : ULONGLONG* optional, out -> Pointer<Uint64>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function SHGetDiskFreeSpaceExW(
  pszDirectoryName: PWideChar;   // LPCWSTR
  pulFreeBytesAvailableToCaller: Pointer;   // ULONGLONG* optional, out
  pulTotalNumberOfBytes: Pointer;   // ULONGLONG* optional, out
  pulTotalNumberOfFreeBytes: Pointer   // ULONGLONG* optional, out
): BOOL; stdcall;
  external 'SHELL32.dll' name 'SHGetDiskFreeSpaceExW';

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

foreign import stdcall safe "SHGetDiskFreeSpaceExW"
  c_SHGetDiskFreeSpaceExW :: CWString -> Ptr Word64 -> Ptr Word64 -> Ptr Word64 -> IO CInt
-- pszDirectoryName : LPCWSTR -> CWString
-- pulFreeBytesAvailableToCaller : ULONGLONG* optional, out -> Ptr Word64
-- pulTotalNumberOfBytes : ULONGLONG* optional, out -> Ptr Word64
-- pulTotalNumberOfFreeBytes : ULONGLONG* optional, out -> Ptr Word64
-- 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 shgetdiskfreespaceexw =
  foreign "SHGetDiskFreeSpaceExW"
    ((ptr uint16_t) @-> (ptr uint64_t) @-> (ptr uint64_t) @-> (ptr uint64_t) @-> returning int32_t)
(* pszDirectoryName : LPCWSTR -> (ptr uint16_t) *)
(* pulFreeBytesAvailableToCaller : ULONGLONG* optional, out -> (ptr uint64_t) *)
(* pulTotalNumberOfBytes : ULONGLONG* optional, out -> (ptr uint64_t) *)
(* pulTotalNumberOfFreeBytes : ULONGLONG* optional, out -> (ptr uint64_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 shell32 (t "SHELL32.dll"))
(cffi:use-foreign-library shell32)

(cffi:defcfun ("SHGetDiskFreeSpaceExW" shget-disk-free-space-ex-w :convention :stdcall) :int32
  (psz-directory-name (:string :encoding :utf-16le))   ; LPCWSTR
  (pul-free-bytes-available-to-caller :pointer)   ; ULONGLONG* optional, out
  (pul-total-number-of-bytes :pointer)   ; ULONGLONG* optional, out
  (pul-total-number-of-free-bytes :pointer))   ; ULONGLONG* optional, out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $SHGetDiskFreeSpaceExW = Win32::API::More->new('SHELL32',
    'BOOL SHGetDiskFreeSpaceExW(LPCWSTR pszDirectoryName, LPVOID pulFreeBytesAvailableToCaller, LPVOID pulTotalNumberOfBytes, LPVOID pulTotalNumberOfFreeBytes)');
# my $ret = $SHGetDiskFreeSpaceExW->Call($pszDirectoryName, $pulFreeBytesAvailableToCaller, $pulTotalNumberOfBytes, $pulTotalNumberOfFreeBytes);
# pszDirectoryName : LPCWSTR -> LPCWSTR
# pulFreeBytesAvailableToCaller : ULONGLONG* optional, out -> LPVOID
# pulTotalNumberOfBytes : ULONGLONG* optional, out -> LPVOID
# pulTotalNumberOfFreeBytes : ULONGLONG* optional, out -> LPVOID
# 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。