CredUnprotectW

// ADVAPI32.dll  (Unicode / -W)
#include <windows.h>

BOOL CredUnprotectW(
    BOOL fAsSelf,
    LPWSTR pszProtectedCredentials,
    DWORD cchProtectedCredentials,
    LPWSTR pszCredentials,   // optional
    DWORD* pcchMaxChars
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CredUnprotectW(
    fAsSelf As Boolean,   ' BOOL
    <MarshalAs(UnmanagedType.LPWStr)> pszProtectedCredentials As String,   ' LPWSTR
    cchProtectedCredentials As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> pszCredentials As System.Text.StringBuilder,   ' LPWSTR optional, out
    ByRef pcchMaxChars As UInteger   ' DWORD* in/out
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' fAsSelf : BOOL
' pszProtectedCredentials : LPWSTR
' cchProtectedCredentials : DWORD
' pszCredentials : LPWSTR optional, out
' pcchMaxChars : DWORD* in/out
Declare PtrSafe Function CredUnprotectW Lib "advapi32" ( _
    ByVal fAsSelf As Long, _
    ByVal pszProtectedCredentials As LongPtr, _
    ByVal cchProtectedCredentials As Long, _
    ByVal pszCredentials As LongPtr, _
    ByRef pcchMaxChars 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

CredUnprotectW = ctypes.windll.advapi32.CredUnprotectW
CredUnprotectW.restype = wintypes.BOOL
CredUnprotectW.argtypes = [
    wintypes.BOOL,  # fAsSelf : BOOL
    wintypes.LPCWSTR,  # pszProtectedCredentials : LPWSTR
    wintypes.DWORD,  # cchProtectedCredentials : DWORD
    wintypes.LPWSTR,  # pszCredentials : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchMaxChars : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
CredUnprotectW = Fiddle::Function.new(
  lib['CredUnprotectW'],
  [
    Fiddle::TYPE_INT,  # fAsSelf : BOOL
    Fiddle::TYPE_VOIDP,  # pszProtectedCredentials : LPWSTR
    -Fiddle::TYPE_INT,  # cchProtectedCredentials : DWORD
    Fiddle::TYPE_VOIDP,  # pszCredentials : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchMaxChars : DWORD* in/out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "advapi32")]
extern "system" {
    fn CredUnprotectW(
        fAsSelf: i32,  // BOOL
        pszProtectedCredentials: *mut u16,  // LPWSTR
        cchProtectedCredentials: u32,  // DWORD
        pszCredentials: *mut u16,  // LPWSTR optional, out
        pcchMaxChars: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("ADVAPI32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool CredUnprotectW(bool fAsSelf, [MarshalAs(UnmanagedType.LPWStr)] string pszProtectedCredentials, uint cchProtectedCredentials, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pszCredentials, ref uint pcchMaxChars);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_CredUnprotectW' -Namespace Win32 -PassThru
# $api::CredUnprotectW(fAsSelf, pszProtectedCredentials, cchProtectedCredentials, pszCredentials, pcchMaxChars)

#uselib "ADVAPI32.dll"
#func global CredUnprotectW "CredUnprotectW" wptr, wptr, wptr, wptr, wptr
; CredUnprotectW fAsSelf, pszProtectedCredentials, cchProtectedCredentials, varptr(pszCredentials), varptr(pcchMaxChars)   ; 戻り値は stat
; fAsSelf : BOOL -> "wptr"
; pszProtectedCredentials : LPWSTR -> "wptr"
; cchProtectedCredentials : DWORD -> "wptr"
; pszCredentials : LPWSTR optional, out -> "wptr"
; pcchMaxChars : DWORD* in/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 (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procCredUnprotectW = advapi32.NewProc("CredUnprotectW")
)

// fAsSelf (BOOL), pszProtectedCredentials (LPWSTR), cchProtectedCredentials (DWORD), pszCredentials (LPWSTR optional, out), pcchMaxChars (DWORD* in/out)
r1, _, err := procCredUnprotectW.Call(
	uintptr(fAsSelf),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszProtectedCredentials))),
	uintptr(cchProtectedCredentials),
	uintptr(pszCredentials),
	uintptr(pcchMaxChars),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function CredUnprotectW(
  fAsSelf: BOOL;   // BOOL
  pszProtectedCredentials: PWideChar;   // LPWSTR
  cchProtectedCredentials: DWORD;   // DWORD
  pszCredentials: PWideChar;   // LPWSTR optional, out
  pcchMaxChars: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'CredUnprotectW';

result := DllCall("ADVAPI32\CredUnprotectW"
    , "Int", fAsSelf   ; BOOL
    , "WStr", pszProtectedCredentials   ; LPWSTR
    , "UInt", cchProtectedCredentials   ; DWORD
    , "Ptr", pszCredentials   ; LPWSTR optional, out
    , "Ptr", pcchMaxChars   ; DWORD* in/out
    , "Int")   ; return: BOOL

●CredUnprotectW(fAsSelf, pszProtectedCredentials, cchProtectedCredentials, pszCredentials, pcchMaxChars) = DLL("ADVAPI32.dll", "bool CredUnprotectW(bool, char*, dword, char*, void*)")
# 呼び出し: CredUnprotectW(fAsSelf, pszProtectedCredentials, cchProtectedCredentials, pszCredentials, pcchMaxChars)
# fAsSelf : BOOL -> "bool"
# pszProtectedCredentials : LPWSTR -> "char*"
# cchProtectedCredentials : DWORD -> "dword"
# pszCredentials : LPWSTR optional, out -> "char*"
# pcchMaxChars : DWORD* in/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 "advapi32" fn CredUnprotectW(
    fAsSelf: i32, // BOOL
    pszProtectedCredentials: [*c]const u16, // LPWSTR
    cchProtectedCredentials: u32, // DWORD
    pszCredentials: [*c]u16, // LPWSTR optional, out
    pcchMaxChars: [*c]u32 // DWORD* in/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 CredUnprotectW(
    fAsSelf: int32,  # BOOL
    pszProtectedCredentials: WideCString,  # LPWSTR
    cchProtectedCredentials: uint32,  # DWORD
    pszCredentials: ptr uint16,  # LPWSTR optional, out
    pcchMaxChars: ptr uint32  # DWORD* in/out
): int32 {.importc: "CredUnprotectW", stdcall, dynlib: "ADVAPI32.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "advapi32");
extern(Windows)
int CredUnprotectW(
    int fAsSelf,   // BOOL
    const(wchar)* pszProtectedCredentials,   // LPWSTR
    uint cchProtectedCredentials,   // DWORD
    wchar* pszCredentials,   // LPWSTR optional, out
    uint* pcchMaxChars   // DWORD* in/out
);

ccall((:CredUnprotectW, "ADVAPI32.dll"), stdcall, Int32,
      (Int32, Cwstring, UInt32, Ptr{UInt16}, Ptr{UInt32}),
      fAsSelf, pszProtectedCredentials, cchProtectedCredentials, pszCredentials, pcchMaxChars)
# fAsSelf : BOOL -> Int32
# pszProtectedCredentials : LPWSTR -> Cwstring
# cchProtectedCredentials : DWORD -> UInt32
# pszCredentials : LPWSTR optional, out -> Ptr{UInt16}
# pcchMaxChars : DWORD* in/out -> Ptr{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 CredUnprotectW(
    int32_t fAsSelf,
    const uint16_t* pszProtectedCredentials,
    uint32_t cchProtectedCredentials,
    uint16_t* pszCredentials,
    uint32_t* pcchMaxChars);
]]
local advapi32 = ffi.load("advapi32")
-- advapi32.CredUnprotectW(fAsSelf, pszProtectedCredentials, cchProtectedCredentials, pszCredentials, pcchMaxChars)
-- fAsSelf : BOOL
-- pszProtectedCredentials : LPWSTR
-- cchProtectedCredentials : DWORD
-- pszCredentials : LPWSTR optional, out
-- pcchMaxChars : DWORD* in/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('ADVAPI32.dll');
const CredUnprotectW = lib.func('__stdcall', 'CredUnprotectW', 'int32_t', ['int32_t', 'str16', 'uint32_t', 'uint16_t *', 'uint32_t *']);
// CredUnprotectW(fAsSelf, pszProtectedCredentials, cchProtectedCredentials, pszCredentials, pcchMaxChars)
// fAsSelf : BOOL -> 'int32_t'
// pszProtectedCredentials : LPWSTR -> 'str16'
// cchProtectedCredentials : DWORD -> 'uint32_t'
// pszCredentials : LPWSTR optional, out -> 'uint16_t *'
// pcchMaxChars : DWORD* in/out -> '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", {
  CredUnprotectW: { parameters: ["i32", "buffer", "u32", "buffer", "pointer"], result: "i32" },
});
// lib.symbols.CredUnprotectW(fAsSelf, pszProtectedCredentials, cchProtectedCredentials, pszCredentials, pcchMaxChars)
// fAsSelf : BOOL -> "i32"
// pszProtectedCredentials : LPWSTR -> "buffer"
// cchProtectedCredentials : DWORD -> "u32"
// pszCredentials : LPWSTR optional, out -> "buffer"
// pcchMaxChars : DWORD* in/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 CredUnprotectW(
    int32_t fAsSelf,
    const uint16_t* pszProtectedCredentials,
    uint32_t cchProtectedCredentials,
    uint16_t* pszCredentials,
    uint32_t* pcchMaxChars);
C, "ADVAPI32.dll");
// $ffi->CredUnprotectW(fAsSelf, pszProtectedCredentials, cchProtectedCredentials, pszCredentials, pcchMaxChars);
// fAsSelf : BOOL
// pszProtectedCredentials : LPWSTR
// cchProtectedCredentials : DWORD
// pszCredentials : LPWSTR optional, out
// pcchMaxChars : DWORD* in/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 Advapi32 extends StdCallLibrary {
    Advapi32 INSTANCE = Native.load("advapi32", Advapi32.class, W32APIOptions.UNICODE_OPTIONS);
    boolean CredUnprotectW(
        boolean fAsSelf,   // BOOL
        WString pszProtectedCredentials,   // LPWSTR
        int cchProtectedCredentials,   // DWORD
        char[] pszCredentials,   // LPWSTR optional, out
        IntByReference pcchMaxChars   // DWORD* in/out
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("advapi32")]
lib LibADVAPI32
  fun CredUnprotectW = CredUnprotectW(
    fAsSelf : Int32,   # BOOL
    pszProtectedCredentials : UInt16*,   # LPWSTR
    cchProtectedCredentials : UInt32,   # DWORD
    pszCredentials : UInt16*,   # LPWSTR optional, out
    pcchMaxChars : UInt32*   # DWORD* in/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 CredUnprotectWNative = Int32 Function(Int32, Pointer<Utf16>, Uint32, Pointer<Utf16>, Pointer<Uint32>);
typedef CredUnprotectWDart = int Function(int, Pointer<Utf16>, int, Pointer<Utf16>, Pointer<Uint32>);
final CredUnprotectW = DynamicLibrary.open('ADVAPI32.dll')
    .lookupFunction<CredUnprotectWNative, CredUnprotectWDart>('CredUnprotectW');
// fAsSelf : BOOL -> Int32
// pszProtectedCredentials : LPWSTR -> Pointer<Utf16>
// cchProtectedCredentials : DWORD -> Uint32
// pszCredentials : LPWSTR optional, out -> Pointer<Utf16>
// pcchMaxChars : DWORD* in/out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function CredUnprotectW(
  fAsSelf: BOOL;   // BOOL
  pszProtectedCredentials: PWideChar;   // LPWSTR
  cchProtectedCredentials: DWORD;   // DWORD
  pszCredentials: PWideChar;   // LPWSTR optional, out
  pcchMaxChars: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'CredUnprotectW';

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

foreign import stdcall safe "CredUnprotectW"
  c_CredUnprotectW :: CInt -> CWString -> Word32 -> CWString -> Ptr Word32 -> IO CInt
-- fAsSelf : BOOL -> CInt
-- pszProtectedCredentials : LPWSTR -> CWString
-- cchProtectedCredentials : DWORD -> Word32
-- pszCredentials : LPWSTR optional, out -> CWString
-- pcchMaxChars : DWORD* in/out -> Ptr 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 credunprotectw =
  foreign "CredUnprotectW"
    (int32_t @-> (ptr uint16_t) @-> uint32_t @-> (ptr uint16_t) @-> (ptr uint32_t) @-> returning int32_t)
(* fAsSelf : BOOL -> int32_t *)
(* pszProtectedCredentials : LPWSTR -> (ptr uint16_t) *)
(* cchProtectedCredentials : DWORD -> uint32_t *)
(* pszCredentials : LPWSTR optional, out -> (ptr uint16_t) *)
(* pcchMaxChars : DWORD* in/out -> (ptr 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 ("CredUnprotectW" cred-unprotect-w :convention :stdcall) :int32
  (f-as-self :int32)   ; BOOL
  (psz-protected-credentials (:string :encoding :utf-16le))   ; LPWSTR
  (cch-protected-credentials :uint32)   ; DWORD
  (psz-credentials :pointer)   ; LPWSTR optional, out
  (pcch-max-chars :pointer))   ; DWORD* in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $CredUnprotectW = Win32::API::More->new('ADVAPI32',
    'BOOL CredUnprotectW(BOOL fAsSelf, LPCWSTR pszProtectedCredentials, DWORD cchProtectedCredentials, LPWSTR pszCredentials, LPVOID pcchMaxChars)');
# my $ret = $CredUnprotectW->Call($fAsSelf, $pszProtectedCredentials, $cchProtectedCredentials, $pszCredentials, $pcchMaxChars);
# fAsSelf : BOOL -> BOOL
# pszProtectedCredentials : LPWSTR -> LPCWSTR
# cchProtectedCredentials : DWORD -> DWORD
# pszCredentials : LPWSTR optional, out -> LPWSTR
# pcchMaxChars : DWORD* in/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。