DecryptFileA

// ADVAPI32.dll  (ANSI / -A)
#include <windows.h>

BOOL DecryptFileA(
    LPCSTR lpFileName,
    DWORD dwReserved   // optional
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function DecryptFileA(
    <MarshalAs(UnmanagedType.LPStr)> lpFileName As String,   ' LPCSTR
    dwReserved As UInteger   ' DWORD optional
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' lpFileName : LPCSTR
' dwReserved : DWORD optional
Declare PtrSafe Function DecryptFileA Lib "advapi32" ( _
    ByVal lpFileName As String, _
    ByVal dwReserved 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

DecryptFileA = ctypes.windll.advapi32.DecryptFileA
DecryptFileA.restype = wintypes.BOOL
DecryptFileA.argtypes = [
    wintypes.LPCSTR,  # lpFileName : LPCSTR
    wintypes.DWORD,  # dwReserved : DWORD optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
DecryptFileA = Fiddle::Function.new(
  lib['DecryptFileA'],
  [
    Fiddle::TYPE_VOIDP,  # lpFileName : LPCSTR
    -Fiddle::TYPE_INT,  # dwReserved : DWORD optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "advapi32")]
extern "system" {
    fn DecryptFileA(
        lpFileName: *const u8,  // LPCSTR
        dwReserved: u32  // DWORD optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("ADVAPI32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern bool DecryptFileA([MarshalAs(UnmanagedType.LPStr)] string lpFileName, uint dwReserved);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_DecryptFileA' -Namespace Win32 -PassThru
# $api::DecryptFileA(lpFileName, dwReserved)

#uselib "ADVAPI32.dll"
#func global DecryptFileA "DecryptFileA" sptr, sptr
; DecryptFileA lpFileName, dwReserved   ; 戻り値は stat
; lpFileName : LPCSTR -> "sptr"
; dwReserved : DWORD optional -> "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 "ADVAPI32.dll"
#cfunc global DecryptFileA "DecryptFileA" str, int
; res = DecryptFileA(lpFileName, dwReserved)
; lpFileName : LPCSTR -> "str"
; dwReserved : DWORD optional -> "int"

; BOOL DecryptFileA(LPCSTR lpFileName, DWORD dwReserved)
#uselib "ADVAPI32.dll"
#cfunc global DecryptFileA "DecryptFileA" str, int
; res = DecryptFileA(lpFileName, dwReserved)
; lpFileName : LPCSTR -> "str"
; dwReserved : DWORD optional -> "int"

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

var (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procDecryptFileA = advapi32.NewProc("DecryptFileA")
)

// lpFileName (LPCSTR), dwReserved (DWORD optional)
r1, _, err := procDecryptFileA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpFileName))),
	uintptr(dwReserved),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function DecryptFileA(
  lpFileName: PAnsiChar;   // LPCSTR
  dwReserved: DWORD   // DWORD optional
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'DecryptFileA';

result := DllCall("ADVAPI32\DecryptFileA"
    , "AStr", lpFileName   ; LPCSTR
    , "UInt", dwReserved   ; DWORD optional
    , "Int")   ; return: BOOL

●DecryptFileA(lpFileName, dwReserved) = DLL("ADVAPI32.dll", "bool DecryptFileA(char*, dword)")
# 呼び出し: DecryptFileA(lpFileName, dwReserved)
# lpFileName : LPCSTR -> "char*"
# dwReserved : DWORD optional -> "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 "advapi32" fn DecryptFileA(
    lpFileName: [*c]const u8, // LPCSTR
    dwReserved: u32 // DWORD optional
) callconv(std.os.windows.WINAPI) i32;

proc DecryptFileA(
    lpFileName: cstring,  # LPCSTR
    dwReserved: uint32  # DWORD optional
): int32 {.importc: "DecryptFileA", stdcall, dynlib: "ADVAPI32.dll".}

pragma(lib, "advapi32");
extern(Windows)
int DecryptFileA(
    const(char)* lpFileName,   // LPCSTR
    uint dwReserved   // DWORD optional
);

ccall((:DecryptFileA, "ADVAPI32.dll"), stdcall, Int32,
      (Cstring, UInt32),
      lpFileName, dwReserved)
# lpFileName : LPCSTR -> Cstring
# dwReserved : DWORD optional -> UInt32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t DecryptFileA(
    const char* lpFileName,
    uint32_t dwReserved);
]]
local advapi32 = ffi.load("advapi32")
-- advapi32.DecryptFileA(lpFileName, dwReserved)
-- lpFileName : LPCSTR
-- dwReserved : DWORD optional
-- 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('ADVAPI32.dll');
const DecryptFileA = lib.func('__stdcall', 'DecryptFileA', 'int32_t', ['str', 'uint32_t']);
// DecryptFileA(lpFileName, dwReserved)
// lpFileName : LPCSTR -> 'str'
// dwReserved : DWORD optional -> '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("ADVAPI32.dll", {
  DecryptFileA: { parameters: ["buffer", "u32"], result: "i32" },
});
// lib.symbols.DecryptFileA(lpFileName, dwReserved)
// lpFileName : LPCSTR -> "buffer"
// dwReserved : DWORD optional -> "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 DecryptFileA(
    const char* lpFileName,
    uint32_t dwReserved);
C, "ADVAPI32.dll");
// $ffi->DecryptFileA(lpFileName, dwReserved);
// lpFileName : LPCSTR
// dwReserved : DWORD optional
// 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 Advapi32 extends StdCallLibrary {
    Advapi32 INSTANCE = Native.load("advapi32", Advapi32.class, W32APIOptions.ASCII_OPTIONS);
    boolean DecryptFileA(
        String lpFileName,   // LPCSTR
        int dwReserved   // DWORD optional
    );
}

@[Link("advapi32")]
lib LibADVAPI32
  fun DecryptFileA = DecryptFileA(
    lpFileName : UInt8*,   # LPCSTR
    dwReserved : UInt32   # DWORD optional
  ) : 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 DecryptFileANative = Int32 Function(Pointer<Utf8>, Uint32);
typedef DecryptFileADart = int Function(Pointer<Utf8>, int);
final DecryptFileA = DynamicLibrary.open('ADVAPI32.dll')
    .lookupFunction<DecryptFileANative, DecryptFileADart>('DecryptFileA');
// lpFileName : LPCSTR -> Pointer<Utf8>
// dwReserved : DWORD optional -> Uint32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function DecryptFileA(
  lpFileName: PAnsiChar;   // LPCSTR
  dwReserved: DWORD   // DWORD optional
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'DecryptFileA';

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

foreign import stdcall safe "DecryptFileA"
  c_DecryptFileA :: CString -> Word32 -> IO CInt
-- lpFileName : LPCSTR -> CString
-- dwReserved : DWORD optional -> 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 decryptfilea =
  foreign "DecryptFileA"
    (string @-> uint32_t @-> returning int32_t)
(* lpFileName : LPCSTR -> string *)
(* dwReserved : DWORD optional -> 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 advapi32 (t "ADVAPI32.dll"))
(cffi:use-foreign-library advapi32)

(cffi:defcfun ("DecryptFileA" decrypt-file-a :convention :stdcall) :int32
  (lp-file-name :string)   ; LPCSTR
  (dw-reserved :uint32))   ; DWORD optional
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $DecryptFileA = Win32::API::More->new('ADVAPI32',
    'BOOL DecryptFileA(LPCSTR lpFileName, DWORD dwReserved)');
# my $ret = $DecryptFileA->Call($lpFileName, $dwReserved);
# lpFileName : LPCSTR -> LPCSTR
# dwReserved : DWORD optional -> DWORD
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。