RtlUnicodeStringToAnsiString

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

NTSTATUS RtlUnicodeStringToAnsiString(
    STRING* DestinationString,
    UNICODE_STRING* SourceString,
    BOOLEAN AllocateDestinationString
);

<DllImport("ntdll.dll", ExactSpelling:=True)>
Public Shared Function RtlUnicodeStringToAnsiString(
    DestinationString As IntPtr,   ' STRING* in/out
    SourceString As IntPtr,   ' UNICODE_STRING* in/out
    <MarshalAs(UnmanagedType.U1)> AllocateDestinationString As Boolean   ' BOOLEAN
) As Integer
End Function

' DestinationString : STRING* in/out
' SourceString : UNICODE_STRING* in/out
' AllocateDestinationString : BOOLEAN
Declare PtrSafe Function RtlUnicodeStringToAnsiString Lib "ntdll" ( _
    ByVal DestinationString As LongPtr, _
    ByVal SourceString As LongPtr, _
    ByVal AllocateDestinationString As Byte) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

RtlUnicodeStringToAnsiString = ctypes.windll.ntdll.RtlUnicodeStringToAnsiString
RtlUnicodeStringToAnsiString.restype = ctypes.c_int
RtlUnicodeStringToAnsiString.argtypes = [
    ctypes.c_void_p,  # DestinationString : STRING* in/out
    ctypes.c_void_p,  # SourceString : UNICODE_STRING* in/out
    wintypes.BOOLEAN,  # AllocateDestinationString : BOOLEAN
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ntdll.dll')
RtlUnicodeStringToAnsiString = Fiddle::Function.new(
  lib['RtlUnicodeStringToAnsiString'],
  [
    Fiddle::TYPE_VOIDP,  # DestinationString : STRING* in/out
    Fiddle::TYPE_VOIDP,  # SourceString : UNICODE_STRING* in/out
    Fiddle::TYPE_CHAR,  # AllocateDestinationString : BOOLEAN
  ],
  Fiddle::TYPE_INT)

#[link(name = "ntdll")]
extern "system" {
    fn RtlUnicodeStringToAnsiString(
        DestinationString: *mut STRING,  // STRING* in/out
        SourceString: *mut UNICODE_STRING,  // UNICODE_STRING* in/out
        AllocateDestinationString: u8  // BOOLEAN
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ntdll.dll")]
public static extern int RtlUnicodeStringToAnsiString(IntPtr DestinationString, IntPtr SourceString, [MarshalAs(UnmanagedType.U1)] bool AllocateDestinationString);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ntdll_RtlUnicodeStringToAnsiString' -Namespace Win32 -PassThru
# $api::RtlUnicodeStringToAnsiString(DestinationString, SourceString, AllocateDestinationString)

#uselib "ntdll.dll"
#func global RtlUnicodeStringToAnsiString "RtlUnicodeStringToAnsiString" sptr, sptr, sptr
; RtlUnicodeStringToAnsiString varptr(DestinationString), varptr(SourceString), AllocateDestinationString   ; 戻り値は stat
; DestinationString : STRING* in/out -> "sptr"
; SourceString : UNICODE_STRING* in/out -> "sptr"
; AllocateDestinationString : BOOLEAN -> "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 (
	ntdll = windows.NewLazySystemDLL("ntdll.dll")
	procRtlUnicodeStringToAnsiString = ntdll.NewProc("RtlUnicodeStringToAnsiString")
)

// DestinationString (STRING* in/out), SourceString (UNICODE_STRING* in/out), AllocateDestinationString (BOOLEAN)
r1, _, err := procRtlUnicodeStringToAnsiString.Call(
	uintptr(DestinationString),
	uintptr(SourceString),
	uintptr(AllocateDestinationString),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // NTSTATUS

function RtlUnicodeStringToAnsiString(
  DestinationString: Pointer;   // STRING* in/out
  SourceString: Pointer;   // UNICODE_STRING* in/out
  AllocateDestinationString: ByteBool   // BOOLEAN
): Integer; stdcall;
  external 'ntdll.dll' name 'RtlUnicodeStringToAnsiString';

result := DllCall("ntdll\RtlUnicodeStringToAnsiString"
    , "Ptr", DestinationString   ; STRING* in/out
    , "Ptr", SourceString   ; UNICODE_STRING* in/out
    , "Char", AllocateDestinationString   ; BOOLEAN
    , "Int")   ; return: NTSTATUS

●RtlUnicodeStringToAnsiString(DestinationString, SourceString, AllocateDestinationString) = DLL("ntdll.dll", "int RtlUnicodeStringToAnsiString(void*, void*, byte)")
# 呼び出し: RtlUnicodeStringToAnsiString(DestinationString, SourceString, AllocateDestinationString)
# DestinationString : STRING* in/out -> "void*"
# SourceString : UNICODE_STRING* in/out -> "void*"
# AllocateDestinationString : BOOLEAN -> "byte"
# 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 "ntdll" fn RtlUnicodeStringToAnsiString(
    DestinationString: [*c]STRING, // STRING* in/out
    SourceString: [*c]UNICODE_STRING, // UNICODE_STRING* in/out
    AllocateDestinationString: u8 // BOOLEAN
) callconv(std.os.windows.WINAPI) i32;

proc RtlUnicodeStringToAnsiString(
    DestinationString: ptr STRING,  # STRING* in/out
    SourceString: ptr UNICODE_STRING,  # UNICODE_STRING* in/out
    AllocateDestinationString: uint8  # BOOLEAN
): int32 {.importc: "RtlUnicodeStringToAnsiString", stdcall, dynlib: "ntdll.dll".}

pragma(lib, "ntdll");
extern(Windows)
int RtlUnicodeStringToAnsiString(
    STRING* DestinationString,   // STRING* in/out
    UNICODE_STRING* SourceString,   // UNICODE_STRING* in/out
    ubyte AllocateDestinationString   // BOOLEAN
);

ccall((:RtlUnicodeStringToAnsiString, "ntdll.dll"), stdcall, Int32,
      (Ptr{STRING}, Ptr{UNICODE_STRING}, UInt8),
      DestinationString, SourceString, AllocateDestinationString)
# DestinationString : STRING* in/out -> Ptr{STRING}
# SourceString : UNICODE_STRING* in/out -> Ptr{UNICODE_STRING}
# AllocateDestinationString : BOOLEAN -> UInt8
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t RtlUnicodeStringToAnsiString(
    void* DestinationString,
    void* SourceString,
    uint8_t AllocateDestinationString);
]]
local ntdll = ffi.load("ntdll")
-- ntdll.RtlUnicodeStringToAnsiString(DestinationString, SourceString, AllocateDestinationString)
-- DestinationString : STRING* in/out
-- SourceString : UNICODE_STRING* in/out
-- AllocateDestinationString : BOOLEAN
-- 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('ntdll.dll');
const RtlUnicodeStringToAnsiString = lib.func('__stdcall', 'RtlUnicodeStringToAnsiString', 'int32_t', ['void *', 'void *', 'uint8_t']);
// RtlUnicodeStringToAnsiString(DestinationString, SourceString, AllocateDestinationString)
// DestinationString : STRING* in/out -> 'void *'
// SourceString : UNICODE_STRING* in/out -> 'void *'
// AllocateDestinationString : BOOLEAN -> 'uint8_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("ntdll.dll", {
  RtlUnicodeStringToAnsiString: { parameters: ["pointer", "pointer", "u8"], result: "i32" },
});
// lib.symbols.RtlUnicodeStringToAnsiString(DestinationString, SourceString, AllocateDestinationString)
// DestinationString : STRING* in/out -> "pointer"
// SourceString : UNICODE_STRING* in/out -> "pointer"
// AllocateDestinationString : BOOLEAN -> "u8"
// 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 RtlUnicodeStringToAnsiString(
    void* DestinationString,
    void* SourceString,
    uint8_t AllocateDestinationString);
C, "ntdll.dll");
// $ffi->RtlUnicodeStringToAnsiString(DestinationString, SourceString, AllocateDestinationString);
// DestinationString : STRING* in/out
// SourceString : UNICODE_STRING* in/out
// AllocateDestinationString : BOOLEAN
// 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 Ntdll extends StdCallLibrary {
    Ntdll INSTANCE = Native.load("ntdll", Ntdll.class);
    int RtlUnicodeStringToAnsiString(
        Pointer DestinationString,   // STRING* in/out
        Pointer SourceString,   // UNICODE_STRING* in/out
        byte AllocateDestinationString   // BOOLEAN
    );
}

@[Link("ntdll")]
lib Libntdll
  fun RtlUnicodeStringToAnsiString = RtlUnicodeStringToAnsiString(
    DestinationString : STRING*,   # STRING* in/out
    SourceString : UNICODE_STRING*,   # UNICODE_STRING* in/out
    AllocateDestinationString : UInt8   # BOOLEAN
  ) : 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 RtlUnicodeStringToAnsiStringNative = Int32 Function(Pointer<Void>, Pointer<Void>, Uint8);
typedef RtlUnicodeStringToAnsiStringDart = int Function(Pointer<Void>, Pointer<Void>, int);
final RtlUnicodeStringToAnsiString = DynamicLibrary.open('ntdll.dll')
    .lookupFunction<RtlUnicodeStringToAnsiStringNative, RtlUnicodeStringToAnsiStringDart>('RtlUnicodeStringToAnsiString');
// DestinationString : STRING* in/out -> Pointer<Void>
// SourceString : UNICODE_STRING* in/out -> Pointer<Void>
// AllocateDestinationString : BOOLEAN -> Uint8
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function RtlUnicodeStringToAnsiString(
  DestinationString: Pointer;   // STRING* in/out
  SourceString: Pointer;   // UNICODE_STRING* in/out
  AllocateDestinationString: ByteBool   // BOOLEAN
): Integer; stdcall;
  external 'ntdll.dll' name 'RtlUnicodeStringToAnsiString';

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

foreign import stdcall safe "RtlUnicodeStringToAnsiString"
  c_RtlUnicodeStringToAnsiString :: Ptr () -> Ptr () -> Word8 -> IO Int32
-- DestinationString : STRING* in/out -> Ptr ()
-- SourceString : UNICODE_STRING* in/out -> Ptr ()
-- AllocateDestinationString : BOOLEAN -> Word8
-- 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 rtlunicodestringtoansistring =
  foreign "RtlUnicodeStringToAnsiString"
    ((ptr void) @-> (ptr void) @-> uint8_t @-> returning int32_t)
(* DestinationString : STRING* in/out -> (ptr void) *)
(* SourceString : UNICODE_STRING* in/out -> (ptr void) *)
(* AllocateDestinationString : BOOLEAN -> uint8_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 ntdll (t "ntdll.dll"))
(cffi:use-foreign-library ntdll)

(cffi:defcfun ("RtlUnicodeStringToAnsiString" rtl-unicode-string-to-ansi-string :convention :stdcall) :int32
  (destination-string :pointer)   ; STRING* in/out
  (source-string :pointer)   ; UNICODE_STRING* in/out
  (allocate-destination-string :uint8))   ; BOOLEAN
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $RtlUnicodeStringToAnsiString = Win32::API::More->new('ntdll',
    'int RtlUnicodeStringToAnsiString(LPVOID DestinationString, LPVOID SourceString, BYTE AllocateDestinationString)');
# my $ret = $RtlUnicodeStringToAnsiString->Call($DestinationString, $SourceString, $AllocateDestinationString);
# DestinationString : STRING* in/out -> LPVOID
# SourceString : UNICODE_STRING* in/out -> LPVOID
# AllocateDestinationString : BOOLEAN -> BYTE
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。