EngUnicodeToMultiByteN

// GDI32.dll
#include <windows.h>

void EngUnicodeToMultiByteN(
    LPSTR MultiByteString,
    DWORD MaxBytesInMultiByteString,
    DWORD* BytesInMultiByteString,   // optional
    LPWSTR UnicodeString,
    DWORD BytesInUnicodeString
);

<DllImport("GDI32.dll", ExactSpelling:=True)>
Public Shared Sub EngUnicodeToMultiByteN(
    <MarshalAs(UnmanagedType.LPStr)> MultiByteString As System.Text.StringBuilder,   ' LPSTR out
    MaxBytesInMultiByteString As UInteger,   ' DWORD
    BytesInMultiByteString As IntPtr,   ' DWORD* optional, out
    <MarshalAs(UnmanagedType.LPWStr)> UnicodeString As String,   ' LPWSTR
    BytesInUnicodeString As UInteger   ' DWORD
)
End Sub

' MultiByteString : LPSTR out
' MaxBytesInMultiByteString : DWORD
' BytesInMultiByteString : DWORD* optional, out
' UnicodeString : LPWSTR
' BytesInUnicodeString : DWORD
Declare PtrSafe Sub EngUnicodeToMultiByteN Lib "gdi32" ( _
    ByVal MultiByteString As String, _
    ByVal MaxBytesInMultiByteString As Long, _
    ByVal BytesInMultiByteString As LongPtr, _
    ByVal UnicodeString As LongPtr, _
    ByVal BytesInUnicodeString As Long)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

EngUnicodeToMultiByteN = ctypes.windll.gdi32.EngUnicodeToMultiByteN
EngUnicodeToMultiByteN.restype = None
EngUnicodeToMultiByteN.argtypes = [
    wintypes.LPSTR,  # MultiByteString : LPSTR out
    wintypes.DWORD,  # MaxBytesInMultiByteString : DWORD
    ctypes.POINTER(wintypes.DWORD),  # BytesInMultiByteString : DWORD* optional, out
    wintypes.LPCWSTR,  # UnicodeString : LPWSTR
    wintypes.DWORD,  # BytesInUnicodeString : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
EngUnicodeToMultiByteN = Fiddle::Function.new(
  lib['EngUnicodeToMultiByteN'],
  [
    Fiddle::TYPE_VOIDP,  # MultiByteString : LPSTR out
    -Fiddle::TYPE_INT,  # MaxBytesInMultiByteString : DWORD
    Fiddle::TYPE_VOIDP,  # BytesInMultiByteString : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # UnicodeString : LPWSTR
    -Fiddle::TYPE_INT,  # BytesInUnicodeString : DWORD
  ],
  Fiddle::TYPE_VOID)

#[link(name = "gdi32")]
extern "system" {
    fn EngUnicodeToMultiByteN(
        MultiByteString: *mut u8,  // LPSTR out
        MaxBytesInMultiByteString: u32,  // DWORD
        BytesInMultiByteString: *mut u32,  // DWORD* optional, out
        UnicodeString: *mut u16,  // LPWSTR
        BytesInUnicodeString: u32  // DWORD
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("GDI32.dll")]
public static extern void EngUnicodeToMultiByteN([MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder MultiByteString, uint MaxBytesInMultiByteString, IntPtr BytesInMultiByteString, [MarshalAs(UnmanagedType.LPWStr)] string UnicodeString, uint BytesInUnicodeString);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_EngUnicodeToMultiByteN' -Namespace Win32 -PassThru
# $api::EngUnicodeToMultiByteN(MultiByteString, MaxBytesInMultiByteString, BytesInMultiByteString, UnicodeString, BytesInUnicodeString)

#uselib "GDI32.dll"
#func global EngUnicodeToMultiByteN "EngUnicodeToMultiByteN" sptr, sptr, sptr, sptr, sptr
; EngUnicodeToMultiByteN varptr(MultiByteString), MaxBytesInMultiByteString, varptr(BytesInMultiByteString), UnicodeString, BytesInUnicodeString
; MultiByteString : LPSTR out -> "sptr"
; MaxBytesInMultiByteString : DWORD -> "sptr"
; BytesInMultiByteString : DWORD* optional, out -> "sptr"
; UnicodeString : LPWSTR -> "sptr"
; BytesInUnicodeString : DWORD -> "sptr"

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

var (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procEngUnicodeToMultiByteN = gdi32.NewProc("EngUnicodeToMultiByteN")
)

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

procedure EngUnicodeToMultiByteN(
  MultiByteString: PAnsiChar;   // LPSTR out
  MaxBytesInMultiByteString: DWORD;   // DWORD
  BytesInMultiByteString: Pointer;   // DWORD* optional, out
  UnicodeString: PWideChar;   // LPWSTR
  BytesInUnicodeString: DWORD   // DWORD
); stdcall;
  external 'GDI32.dll' name 'EngUnicodeToMultiByteN';

result := DllCall("GDI32\EngUnicodeToMultiByteN"
    , "Ptr", MultiByteString   ; LPSTR out
    , "UInt", MaxBytesInMultiByteString   ; DWORD
    , "Ptr", BytesInMultiByteString   ; DWORD* optional, out
    , "WStr", UnicodeString   ; LPWSTR
    , "UInt", BytesInUnicodeString   ; DWORD
    , "Int")   ; return: void

●EngUnicodeToMultiByteN(MultiByteString, MaxBytesInMultiByteString, BytesInMultiByteString, UnicodeString, BytesInUnicodeString) = DLL("GDI32.dll", "int EngUnicodeToMultiByteN(char*, dword, void*, char*, dword)")
# 呼び出し: EngUnicodeToMultiByteN(MultiByteString, MaxBytesInMultiByteString, BytesInMultiByteString, UnicodeString, BytesInUnicodeString)
# MultiByteString : LPSTR out -> "char*"
# MaxBytesInMultiByteString : DWORD -> "dword"
# BytesInMultiByteString : DWORD* optional, 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 "gdi32" fn EngUnicodeToMultiByteN(
    MultiByteString: [*c]u8, // LPSTR out
    MaxBytesInMultiByteString: u32, // DWORD
    BytesInMultiByteString: [*c]u32, // DWORD* optional, out
    UnicodeString: [*c]const u16, // LPWSTR
    BytesInUnicodeString: u32 // DWORD
) callconv(std.os.windows.WINAPI) void;

proc EngUnicodeToMultiByteN(
    MultiByteString: ptr char,  # LPSTR out
    MaxBytesInMultiByteString: uint32,  # DWORD
    BytesInMultiByteString: ptr uint32,  # DWORD* optional, out
    UnicodeString: WideCString,  # LPWSTR
    BytesInUnicodeString: uint32  # DWORD
) {.importc: "EngUnicodeToMultiByteN", stdcall, dynlib: "GDI32.dll".}

pragma(lib, "gdi32");
extern(Windows)
void EngUnicodeToMultiByteN(
    char* MultiByteString,   // LPSTR out
    uint MaxBytesInMultiByteString,   // DWORD
    uint* BytesInMultiByteString,   // DWORD* optional, out
    const(wchar)* UnicodeString,   // LPWSTR
    uint BytesInUnicodeString   // DWORD
);

ccall((:EngUnicodeToMultiByteN, "GDI32.dll"), stdcall, Cvoid,
      (Ptr{UInt8}, UInt32, Ptr{UInt32}, Cwstring, UInt32),
      MultiByteString, MaxBytesInMultiByteString, BytesInMultiByteString, UnicodeString, BytesInUnicodeString)
# MultiByteString : LPSTR out -> Ptr{UInt8}
# MaxBytesInMultiByteString : DWORD -> UInt32
# BytesInMultiByteString : DWORD* optional, 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[[
void EngUnicodeToMultiByteN(
    char* MultiByteString,
    uint32_t MaxBytesInMultiByteString,
    uint32_t* BytesInMultiByteString,
    const uint16_t* UnicodeString,
    uint32_t BytesInUnicodeString);
]]
local gdi32 = ffi.load("gdi32")
-- gdi32.EngUnicodeToMultiByteN(MultiByteString, MaxBytesInMultiByteString, BytesInMultiByteString, UnicodeString, BytesInUnicodeString)
-- MultiByteString : LPSTR out
-- MaxBytesInMultiByteString : DWORD
-- BytesInMultiByteString : DWORD* optional, 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('GDI32.dll');
const EngUnicodeToMultiByteN = lib.func('__stdcall', 'EngUnicodeToMultiByteN', 'void', ['char *', 'uint32_t', 'uint32_t *', 'str16', 'uint32_t']);
// EngUnicodeToMultiByteN(MultiByteString, MaxBytesInMultiByteString, BytesInMultiByteString, UnicodeString, BytesInUnicodeString)
// MultiByteString : LPSTR out -> 'char *'
// MaxBytesInMultiByteString : DWORD -> 'uint32_t'
// BytesInMultiByteString : DWORD* optional, 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("GDI32.dll", {
  EngUnicodeToMultiByteN: { parameters: ["buffer", "u32", "pointer", "buffer", "u32"], result: "void" },
});
// lib.symbols.EngUnicodeToMultiByteN(MultiByteString, MaxBytesInMultiByteString, BytesInMultiByteString, UnicodeString, BytesInUnicodeString)
// MultiByteString : LPSTR out -> "buffer"
// MaxBytesInMultiByteString : DWORD -> "u32"
// BytesInMultiByteString : DWORD* optional, 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
void EngUnicodeToMultiByteN(
    char* MultiByteString,
    uint32_t MaxBytesInMultiByteString,
    uint32_t* BytesInMultiByteString,
    const uint16_t* UnicodeString,
    uint32_t BytesInUnicodeString);
C, "GDI32.dll");
// $ffi->EngUnicodeToMultiByteN(MultiByteString, MaxBytesInMultiByteString, BytesInMultiByteString, UnicodeString, BytesInUnicodeString);
// MultiByteString : LPSTR out
// MaxBytesInMultiByteString : DWORD
// BytesInMultiByteString : DWORD* optional, 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 Gdi32 extends StdCallLibrary {
    Gdi32 INSTANCE = Native.load("gdi32", Gdi32.class);
    void EngUnicodeToMultiByteN(
        byte[] MultiByteString,   // LPSTR out
        int MaxBytesInMultiByteString,   // DWORD
        IntByReference BytesInMultiByteString,   // DWORD* optional, out
        WString UnicodeString,   // LPWSTR
        int BytesInUnicodeString   // DWORD
    );
}

@[Link("gdi32")]
lib LibGDI32
  fun EngUnicodeToMultiByteN = EngUnicodeToMultiByteN(
    MultiByteString : UInt8*,   # LPSTR out
    MaxBytesInMultiByteString : UInt32,   # DWORD
    BytesInMultiByteString : UInt32*,   # DWORD* optional, out
    UnicodeString : UInt16*,   # LPWSTR
    BytesInUnicodeString : UInt32   # DWORD
  ) : Void
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 EngUnicodeToMultiByteNNative = Void Function(Pointer<Utf8>, Uint32, Pointer<Uint32>, Pointer<Utf16>, Uint32);
typedef EngUnicodeToMultiByteNDart = void Function(Pointer<Utf8>, int, Pointer<Uint32>, Pointer<Utf16>, int);
final EngUnicodeToMultiByteN = DynamicLibrary.open('GDI32.dll')
    .lookupFunction<EngUnicodeToMultiByteNNative, EngUnicodeToMultiByteNDart>('EngUnicodeToMultiByteN');
// MultiByteString : LPSTR out -> Pointer<Utf8>
// MaxBytesInMultiByteString : DWORD -> Uint32
// BytesInMultiByteString : DWORD* optional, 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+}
procedure EngUnicodeToMultiByteN(
  MultiByteString: PAnsiChar;   // LPSTR out
  MaxBytesInMultiByteString: DWORD;   // DWORD
  BytesInMultiByteString: Pointer;   // DWORD* optional, out
  UnicodeString: PWideChar;   // LPWSTR
  BytesInUnicodeString: DWORD   // DWORD
); stdcall;
  external 'GDI32.dll' name 'EngUnicodeToMultiByteN';

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

foreign import stdcall safe "EngUnicodeToMultiByteN"
  c_EngUnicodeToMultiByteN :: CString -> Word32 -> Ptr Word32 -> CWString -> Word32 -> IO ()
-- MultiByteString : LPSTR out -> CString
-- MaxBytesInMultiByteString : DWORD -> Word32
-- BytesInMultiByteString : DWORD* optional, 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 engunicodetomultibyten =
  foreign "EngUnicodeToMultiByteN"
    (string @-> uint32_t @-> (ptr uint32_t) @-> (ptr uint16_t) @-> uint32_t @-> returning void)
(* MultiByteString : LPSTR out -> string *)
(* MaxBytesInMultiByteString : DWORD -> uint32_t *)
(* BytesInMultiByteString : DWORD* optional, 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 gdi32 (t "GDI32.dll"))
(cffi:use-foreign-library gdi32)

(cffi:defcfun ("EngUnicodeToMultiByteN" eng-unicode-to-multi-byte-n :convention :stdcall) :void
  (multi-byte-string :pointer)   ; LPSTR out
  (max-bytes-in-multi-byte-string :uint32)   ; DWORD
  (bytes-in-multi-byte-string :pointer)   ; DWORD* optional, 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 $EngUnicodeToMultiByteN = Win32::API::More->new('GDI32',
    'void EngUnicodeToMultiByteN(LPSTR MultiByteString, DWORD MaxBytesInMultiByteString, LPVOID BytesInMultiByteString, LPCWSTR UnicodeString, DWORD BytesInUnicodeString)');
# my $ret = $EngUnicodeToMultiByteN->Call($MultiByteString, $MaxBytesInMultiByteString, $BytesInMultiByteString, $UnicodeString, $BytesInUnicodeString);
# MultiByteString : LPSTR out -> LPSTR
# MaxBytesInMultiByteString : DWORD -> DWORD
# BytesInMultiByteString : DWORD* optional, 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。