GetDiskInfoA

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

BOOL GetDiskInfoA(
    LPCSTR pszPath,
    DWORD* pdwClusterSize,   // optional
    ULONGLONG* pdlAvail,   // optional
    ULONGLONG* pdlTotal   // optional
);

<DllImport("WININET.dll", ExactSpelling:=True)>
Public Shared Function GetDiskInfoA(
    <MarshalAs(UnmanagedType.LPStr)> pszPath As String,   ' LPCSTR
    pdwClusterSize As IntPtr,   ' DWORD* optional, out
    pdlAvail As IntPtr,   ' ULONGLONG* optional, out
    pdlTotal As IntPtr   ' ULONGLONG* optional, out
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' pszPath : LPCSTR
' pdwClusterSize : DWORD* optional, out
' pdlAvail : ULONGLONG* optional, out
' pdlTotal : ULONGLONG* optional, out
Declare PtrSafe Function GetDiskInfoA Lib "wininet" ( _
    ByVal pszPath As String, _
    ByVal pdwClusterSize As LongPtr, _
    ByVal pdlAvail As LongPtr, _
    ByVal pdlTotal As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetDiskInfoA = ctypes.windll.wininet.GetDiskInfoA
GetDiskInfoA.restype = wintypes.BOOL
GetDiskInfoA.argtypes = [
    wintypes.LPCSTR,  # pszPath : LPCSTR
    ctypes.POINTER(wintypes.DWORD),  # pdwClusterSize : DWORD* optional, out
    ctypes.POINTER(ctypes.c_ulonglong),  # pdlAvail : ULONGLONG* optional, out
    ctypes.POINTER(ctypes.c_ulonglong),  # pdlTotal : ULONGLONG* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WININET.dll')
GetDiskInfoA = Fiddle::Function.new(
  lib['GetDiskInfoA'],
  [
    Fiddle::TYPE_VOIDP,  # pszPath : LPCSTR
    Fiddle::TYPE_VOIDP,  # pdwClusterSize : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # pdlAvail : ULONGLONG* optional, out
    Fiddle::TYPE_VOIDP,  # pdlTotal : ULONGLONG* optional, out
  ],
  Fiddle::TYPE_INT)

#[link(name = "wininet")]
extern "system" {
    fn GetDiskInfoA(
        pszPath: *const u8,  // LPCSTR
        pdwClusterSize: *mut u32,  // DWORD* optional, out
        pdlAvail: *mut u64,  // ULONGLONG* optional, out
        pdlTotal: *mut u64  // ULONGLONG* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("WININET.dll")]
public static extern bool GetDiskInfoA([MarshalAs(UnmanagedType.LPStr)] string pszPath, IntPtr pdwClusterSize, IntPtr pdlAvail, IntPtr pdlTotal);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WININET_GetDiskInfoA' -Namespace Win32 -PassThru
# $api::GetDiskInfoA(pszPath, pdwClusterSize, pdlAvail, pdlTotal)

#uselib "WININET.dll"
#func global GetDiskInfoA "GetDiskInfoA" sptr, sptr, sptr, sptr
; GetDiskInfoA pszPath, varptr(pdwClusterSize), varptr(pdlAvail), varptr(pdlTotal)   ; 戻り値は stat
; pszPath : LPCSTR -> "sptr"
; pdwClusterSize : DWORD* optional, out -> "sptr"
; pdlAvail : ULONGLONG* optional, out -> "sptr"
; pdlTotal : ULONGLONG* optional, 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。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	wininet = windows.NewLazySystemDLL("WININET.dll")
	procGetDiskInfoA = wininet.NewProc("GetDiskInfoA")
)

// pszPath (LPCSTR), pdwClusterSize (DWORD* optional, out), pdlAvail (ULONGLONG* optional, out), pdlTotal (ULONGLONG* optional, out)
r1, _, err := procGetDiskInfoA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(pszPath))),
	uintptr(pdwClusterSize),
	uintptr(pdlAvail),
	uintptr(pdlTotal),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetDiskInfoA(
  pszPath: PAnsiChar;   // LPCSTR
  pdwClusterSize: Pointer;   // DWORD* optional, out
  pdlAvail: Pointer;   // ULONGLONG* optional, out
  pdlTotal: Pointer   // ULONGLONG* optional, out
): BOOL; stdcall;
  external 'WININET.dll' name 'GetDiskInfoA';

result := DllCall("WININET\GetDiskInfoA"
    , "AStr", pszPath   ; LPCSTR
    , "Ptr", pdwClusterSize   ; DWORD* optional, out
    , "Ptr", pdlAvail   ; ULONGLONG* optional, out
    , "Ptr", pdlTotal   ; ULONGLONG* optional, out
    , "Int")   ; return: BOOL

●GetDiskInfoA(pszPath, pdwClusterSize, pdlAvail, pdlTotal) = DLL("WININET.dll", "bool GetDiskInfoA(char*, void*, void*, void*)")
# 呼び出し: GetDiskInfoA(pszPath, pdwClusterSize, pdlAvail, pdlTotal)
# pszPath : LPCSTR -> "char*"
# pdwClusterSize : DWORD* optional, out -> "void*"
# pdlAvail : ULONGLONG* optional, out -> "void*"
# pdlTotal : 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)。

const std = @import("std");

extern "wininet" fn GetDiskInfoA(
    pszPath: [*c]const u8, // LPCSTR
    pdwClusterSize: [*c]u32, // DWORD* optional, out
    pdlAvail: [*c]u64, // ULONGLONG* optional, out
    pdlTotal: [*c]u64 // ULONGLONG* optional, out
) callconv(std.os.windows.WINAPI) i32;

proc GetDiskInfoA(
    pszPath: cstring,  # LPCSTR
    pdwClusterSize: ptr uint32,  # DWORD* optional, out
    pdlAvail: ptr uint64,  # ULONGLONG* optional, out
    pdlTotal: ptr uint64  # ULONGLONG* optional, out
): int32 {.importc: "GetDiskInfoA", stdcall, dynlib: "WININET.dll".}

pragma(lib, "wininet");
extern(Windows)
int GetDiskInfoA(
    const(char)* pszPath,   // LPCSTR
    uint* pdwClusterSize,   // DWORD* optional, out
    ulong* pdlAvail,   // ULONGLONG* optional, out
    ulong* pdlTotal   // ULONGLONG* optional, out
);

ccall((:GetDiskInfoA, "WININET.dll"), stdcall, Int32,
      (Cstring, Ptr{UInt32}, Ptr{UInt64}, Ptr{UInt64}),
      pszPath, pdwClusterSize, pdlAvail, pdlTotal)
# pszPath : LPCSTR -> Cstring
# pdwClusterSize : DWORD* optional, out -> Ptr{UInt32}
# pdlAvail : ULONGLONG* optional, out -> Ptr{UInt64}
# pdlTotal : ULONGLONG* optional, out -> Ptr{UInt64}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t GetDiskInfoA(
    const char* pszPath,
    uint32_t* pdwClusterSize,
    uint64_t* pdlAvail,
    uint64_t* pdlTotal);
]]
local wininet = ffi.load("wininet")
-- wininet.GetDiskInfoA(pszPath, pdwClusterSize, pdlAvail, pdlTotal)
-- pszPath : LPCSTR
-- pdwClusterSize : DWORD* optional, out
-- pdlAvail : ULONGLONG* optional, out
-- pdlTotal : 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。

const koffi = require('koffi');
const lib = koffi.load('WININET.dll');
const GetDiskInfoA = lib.func('__stdcall', 'GetDiskInfoA', 'int32_t', ['str', 'uint32_t *', 'uint64_t *', 'uint64_t *']);
// GetDiskInfoA(pszPath, pdwClusterSize, pdlAvail, pdlTotal)
// pszPath : LPCSTR -> 'str'
// pdwClusterSize : DWORD* optional, out -> 'uint32_t *'
// pdlAvail : ULONGLONG* optional, out -> 'uint64_t *'
// pdlTotal : 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("WININET.dll", {
  GetDiskInfoA: { parameters: ["buffer", "pointer", "pointer", "pointer"], result: "i32" },
});
// lib.symbols.GetDiskInfoA(pszPath, pdwClusterSize, pdlAvail, pdlTotal)
// pszPath : LPCSTR -> "buffer"
// pdwClusterSize : DWORD* optional, out -> "pointer"
// pdlAvail : ULONGLONG* optional, out -> "pointer"
// pdlTotal : ULONGLONG* optional, out -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t GetDiskInfoA(
    const char* pszPath,
    uint32_t* pdwClusterSize,
    uint64_t* pdlAvail,
    uint64_t* pdlTotal);
C, "WININET.dll");
// $ffi->GetDiskInfoA(pszPath, pdwClusterSize, pdlAvail, pdlTotal);
// pszPath : LPCSTR
// pdwClusterSize : DWORD* optional, out
// pdlAvail : ULONGLONG* optional, out
// pdlTotal : 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 Wininet extends StdCallLibrary {
    Wininet INSTANCE = Native.load("wininet", Wininet.class);
    boolean GetDiskInfoA(
        String pszPath,   // LPCSTR
        IntByReference pdwClusterSize,   // DWORD* optional, out
        LongByReference pdlAvail,   // ULONGLONG* optional, out
        LongByReference pdlTotal   // ULONGLONG* optional, out
    );
}

@[Link("wininet")]
lib LibWININET
  fun GetDiskInfoA = GetDiskInfoA(
    pszPath : UInt8*,   # LPCSTR
    pdwClusterSize : UInt32*,   # DWORD* optional, out
    pdlAvail : UInt64*,   # ULONGLONG* optional, out
    pdlTotal : 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 GetDiskInfoANative = Int32 Function(Pointer<Utf8>, Pointer<Uint32>, Pointer<Uint64>, Pointer<Uint64>);
typedef GetDiskInfoADart = int Function(Pointer<Utf8>, Pointer<Uint32>, Pointer<Uint64>, Pointer<Uint64>);
final GetDiskInfoA = DynamicLibrary.open('WININET.dll')
    .lookupFunction<GetDiskInfoANative, GetDiskInfoADart>('GetDiskInfoA');
// pszPath : LPCSTR -> Pointer<Utf8>
// pdwClusterSize : DWORD* optional, out -> Pointer<Uint32>
// pdlAvail : ULONGLONG* optional, out -> Pointer<Uint64>
// pdlTotal : ULONGLONG* optional, out -> Pointer<Uint64>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GetDiskInfoA(
  pszPath: PAnsiChar;   // LPCSTR
  pdwClusterSize: Pointer;   // DWORD* optional, out
  pdlAvail: Pointer;   // ULONGLONG* optional, out
  pdlTotal: Pointer   // ULONGLONG* optional, out
): BOOL; stdcall;
  external 'WININET.dll' name 'GetDiskInfoA';

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

foreign import stdcall safe "GetDiskInfoA"
  c_GetDiskInfoA :: CString -> Ptr Word32 -> Ptr Word64 -> Ptr Word64 -> IO CInt
-- pszPath : LPCSTR -> CString
-- pdwClusterSize : DWORD* optional, out -> Ptr Word32
-- pdlAvail : ULONGLONG* optional, out -> Ptr Word64
-- pdlTotal : 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 getdiskinfoa =
  foreign "GetDiskInfoA"
    (string @-> (ptr uint32_t) @-> (ptr uint64_t) @-> (ptr uint64_t) @-> returning int32_t)
(* pszPath : LPCSTR -> string *)
(* pdwClusterSize : DWORD* optional, out -> (ptr uint32_t) *)
(* pdlAvail : ULONGLONG* optional, out -> (ptr uint64_t) *)
(* pdlTotal : 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 wininet (t "WININET.dll"))
(cffi:use-foreign-library wininet)

(cffi:defcfun ("GetDiskInfoA" get-disk-info-a :convention :stdcall) :int32
  (psz-path :string)   ; LPCSTR
  (pdw-cluster-size :pointer)   ; DWORD* optional, out
  (pdl-avail :pointer)   ; ULONGLONG* optional, out
  (pdl-total :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 $GetDiskInfoA = Win32::API::More->new('WININET',
    'BOOL GetDiskInfoA(LPCSTR pszPath, LPVOID pdwClusterSize, LPVOID pdlAvail, LPVOID pdlTotal)');
# my $ret = $GetDiskInfoA->Call($pszPath, $pdwClusterSize, $pdlAvail, $pdlTotal);
# pszPath : LPCSTR -> LPCSTR
# pdwClusterSize : DWORD* optional, out -> LPVOID
# pdlAvail : ULONGLONG* optional, out -> LPVOID
# pdlTotal : 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。