RtlUnicodeToMultiByteSize

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

NTSTATUS RtlUnicodeToMultiByteSize(
    DWORD* BytesInMultiByteString,
    LPWSTR UnicodeString,
    DWORD BytesInUnicodeString
);

<DllImport("ntdll.dll", ExactSpelling:=True)>
Public Shared Function RtlUnicodeToMultiByteSize(
    <Out> ByRef BytesInMultiByteString As UInteger,   ' DWORD* out
    <MarshalAs(UnmanagedType.LPWStr)> UnicodeString As String,   ' LPWSTR
    BytesInUnicodeString As UInteger   ' DWORD
) As Integer
End Function

' BytesInMultiByteString : DWORD* out
' UnicodeString : LPWSTR
' BytesInUnicodeString : DWORD
Declare PtrSafe Function RtlUnicodeToMultiByteSize Lib "ntdll" ( _
    ByRef BytesInMultiByteString As Long, _
    ByVal UnicodeString As LongPtr, _
    ByVal BytesInUnicodeString 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

RtlUnicodeToMultiByteSize = ctypes.windll.ntdll.RtlUnicodeToMultiByteSize
RtlUnicodeToMultiByteSize.restype = ctypes.c_int
RtlUnicodeToMultiByteSize.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # BytesInMultiByteString : DWORD* out
    wintypes.LPCWSTR,  # UnicodeString : LPWSTR
    wintypes.DWORD,  # BytesInUnicodeString : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ntdll.dll')
RtlUnicodeToMultiByteSize = Fiddle::Function.new(
  lib['RtlUnicodeToMultiByteSize'],
  [
    Fiddle::TYPE_VOIDP,  # BytesInMultiByteString : DWORD* out
    Fiddle::TYPE_VOIDP,  # UnicodeString : LPWSTR
    -Fiddle::TYPE_INT,  # BytesInUnicodeString : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "ntdll")]
extern "system" {
    fn RtlUnicodeToMultiByteSize(
        BytesInMultiByteString: *mut u32,  // DWORD* out
        UnicodeString: *mut u16,  // LPWSTR
        BytesInUnicodeString: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ntdll.dll")]
public static extern int RtlUnicodeToMultiByteSize(out uint BytesInMultiByteString, [MarshalAs(UnmanagedType.LPWStr)] string UnicodeString, uint BytesInUnicodeString);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ntdll_RtlUnicodeToMultiByteSize' -Namespace Win32 -PassThru
# $api::RtlUnicodeToMultiByteSize(BytesInMultiByteString, UnicodeString, BytesInUnicodeString)

#uselib "ntdll.dll"
#func global RtlUnicodeToMultiByteSize "RtlUnicodeToMultiByteSize" sptr, sptr, sptr
; RtlUnicodeToMultiByteSize varptr(BytesInMultiByteString), UnicodeString, BytesInUnicodeString   ; 戻り値は stat
; BytesInMultiByteString : DWORD* out -> "sptr"
; UnicodeString : LPWSTR -> "sptr"
; BytesInUnicodeString : DWORD -> "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")
	procRtlUnicodeToMultiByteSize = ntdll.NewProc("RtlUnicodeToMultiByteSize")
)

// BytesInMultiByteString (DWORD* out), UnicodeString (LPWSTR), BytesInUnicodeString (DWORD)
r1, _, err := procRtlUnicodeToMultiByteSize.Call(
	uintptr(BytesInMultiByteString),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(UnicodeString))),
	uintptr(BytesInUnicodeString),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // NTSTATUS

function RtlUnicodeToMultiByteSize(
  BytesInMultiByteString: Pointer;   // DWORD* out
  UnicodeString: PWideChar;   // LPWSTR
  BytesInUnicodeString: DWORD   // DWORD
): Integer; stdcall;
  external 'ntdll.dll' name 'RtlUnicodeToMultiByteSize';

result := DllCall("ntdll\RtlUnicodeToMultiByteSize"
    , "Ptr", BytesInMultiByteString   ; DWORD* out
    , "WStr", UnicodeString   ; LPWSTR
    , "UInt", BytesInUnicodeString   ; DWORD
    , "Int")   ; return: NTSTATUS

●RtlUnicodeToMultiByteSize(BytesInMultiByteString, UnicodeString, BytesInUnicodeString) = DLL("ntdll.dll", "int RtlUnicodeToMultiByteSize(void*, char*, dword)")
# 呼び出し: RtlUnicodeToMultiByteSize(BytesInMultiByteString, UnicodeString, BytesInUnicodeString)
# BytesInMultiByteString : DWORD* out -> "void*"
# UnicodeString : LPWSTR -> "char*"
# BytesInUnicodeString : DWORD -> "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 "ntdll" fn RtlUnicodeToMultiByteSize(
    BytesInMultiByteString: [*c]u32, // DWORD* out
    UnicodeString: [*c]const u16, // LPWSTR
    BytesInUnicodeString: u32 // DWORD
) callconv(std.os.windows.WINAPI) i32;

proc RtlUnicodeToMultiByteSize(
    BytesInMultiByteString: ptr uint32,  # DWORD* out
    UnicodeString: WideCString,  # LPWSTR
    BytesInUnicodeString: uint32  # DWORD
): int32 {.importc: "RtlUnicodeToMultiByteSize", stdcall, dynlib: "ntdll.dll".}

pragma(lib, "ntdll");
extern(Windows)
int RtlUnicodeToMultiByteSize(
    uint* BytesInMultiByteString,   // DWORD* out
    const(wchar)* UnicodeString,   // LPWSTR
    uint BytesInUnicodeString   // DWORD
);

ccall((:RtlUnicodeToMultiByteSize, "ntdll.dll"), stdcall, Int32,
      (Ptr{UInt32}, Cwstring, UInt32),
      BytesInMultiByteString, UnicodeString, BytesInUnicodeString)
# BytesInMultiByteString : DWORD* out -> Ptr{UInt32}
# UnicodeString : LPWSTR -> Cwstring
# BytesInUnicodeString : DWORD -> UInt32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t RtlUnicodeToMultiByteSize(
    uint32_t* BytesInMultiByteString,
    const uint16_t* UnicodeString,
    uint32_t BytesInUnicodeString);
]]
local ntdll = ffi.load("ntdll")
-- ntdll.RtlUnicodeToMultiByteSize(BytesInMultiByteString, UnicodeString, BytesInUnicodeString)
-- BytesInMultiByteString : DWORD* out
-- UnicodeString : LPWSTR
-- BytesInUnicodeString : DWORD
-- 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 RtlUnicodeToMultiByteSize = lib.func('__stdcall', 'RtlUnicodeToMultiByteSize', 'int32_t', ['uint32_t *', 'str16', 'uint32_t']);
// RtlUnicodeToMultiByteSize(BytesInMultiByteString, UnicodeString, BytesInUnicodeString)
// BytesInMultiByteString : DWORD* out -> 'uint32_t *'
// UnicodeString : LPWSTR -> 'str16'
// BytesInUnicodeString : DWORD -> '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("ntdll.dll", {
  RtlUnicodeToMultiByteSize: { parameters: ["pointer", "buffer", "u32"], result: "i32" },
});
// lib.symbols.RtlUnicodeToMultiByteSize(BytesInMultiByteString, UnicodeString, BytesInUnicodeString)
// BytesInMultiByteString : DWORD* out -> "pointer"
// UnicodeString : LPWSTR -> "buffer"
// BytesInUnicodeString : DWORD -> "u32"
// 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 RtlUnicodeToMultiByteSize(
    uint32_t* BytesInMultiByteString,
    const uint16_t* UnicodeString,
    uint32_t BytesInUnicodeString);
C, "ntdll.dll");
// $ffi->RtlUnicodeToMultiByteSize(BytesInMultiByteString, UnicodeString, BytesInUnicodeString);
// BytesInMultiByteString : DWORD* out
// UnicodeString : LPWSTR
// BytesInUnicodeString : DWORD
// 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 RtlUnicodeToMultiByteSize(
        IntByReference BytesInMultiByteString,   // DWORD* out
        WString UnicodeString,   // LPWSTR
        int BytesInUnicodeString   // DWORD
    );
}

@[Link("ntdll")]
lib Libntdll
  fun RtlUnicodeToMultiByteSize = RtlUnicodeToMultiByteSize(
    BytesInMultiByteString : UInt32*,   # DWORD* out
    UnicodeString : UInt16*,   # LPWSTR
    BytesInUnicodeString : UInt32   # DWORD
  ) : 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 RtlUnicodeToMultiByteSizeNative = Int32 Function(Pointer<Uint32>, Pointer<Utf16>, Uint32);
typedef RtlUnicodeToMultiByteSizeDart = int Function(Pointer<Uint32>, Pointer<Utf16>, int);
final RtlUnicodeToMultiByteSize = DynamicLibrary.open('ntdll.dll')
    .lookupFunction<RtlUnicodeToMultiByteSizeNative, RtlUnicodeToMultiByteSizeDart>('RtlUnicodeToMultiByteSize');
// BytesInMultiByteString : DWORD* out -> Pointer<Uint32>
// UnicodeString : LPWSTR -> Pointer<Utf16>
// BytesInUnicodeString : DWORD -> Uint32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function RtlUnicodeToMultiByteSize(
  BytesInMultiByteString: Pointer;   // DWORD* out
  UnicodeString: PWideChar;   // LPWSTR
  BytesInUnicodeString: DWORD   // DWORD
): Integer; stdcall;
  external 'ntdll.dll' name 'RtlUnicodeToMultiByteSize';

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

foreign import stdcall safe "RtlUnicodeToMultiByteSize"
  c_RtlUnicodeToMultiByteSize :: Ptr Word32 -> CWString -> Word32 -> IO Int32
-- BytesInMultiByteString : DWORD* out -> Ptr Word32
-- UnicodeString : LPWSTR -> CWString
-- BytesInUnicodeString : DWORD -> 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 rtlunicodetomultibytesize =
  foreign "RtlUnicodeToMultiByteSize"
    ((ptr uint32_t) @-> (ptr uint16_t) @-> uint32_t @-> returning int32_t)
(* BytesInMultiByteString : DWORD* out -> (ptr uint32_t) *)
(* UnicodeString : LPWSTR -> (ptr uint16_t) *)
(* BytesInUnicodeString : DWORD -> 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 ntdll (t "ntdll.dll"))
(cffi:use-foreign-library ntdll)

(cffi:defcfun ("RtlUnicodeToMultiByteSize" rtl-unicode-to-multi-byte-size :convention :stdcall) :int32
  (bytes-in-multi-byte-string :pointer)   ; DWORD* out
  (unicode-string (:string :encoding :utf-16le))   ; LPWSTR
  (bytes-in-unicode-string :uint32))   ; DWORD
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $RtlUnicodeToMultiByteSize = Win32::API::More->new('ntdll',
    'int RtlUnicodeToMultiByteSize(LPVOID BytesInMultiByteString, LPCWSTR UnicodeString, DWORD BytesInUnicodeString)');
# my $ret = $RtlUnicodeToMultiByteSize->Call($BytesInMultiByteString, $UnicodeString, $BytesInUnicodeString);
# BytesInMultiByteString : DWORD* out -> LPVOID
# UnicodeString : LPWSTR -> LPCWSTR
# BytesInUnicodeString : DWORD -> DWORD
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。