VarWeekdayName

// OLEAUT32.dll
#include <windows.h>

HRESULT VarWeekdayName(
    INT iWeekday,
    INT fAbbrev,
    INT iFirstDay,
    DWORD dwFlags,
    LPWSTR* pbstrOut
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarWeekdayName(
    iWeekday As Integer,   ' INT
    fAbbrev As Integer,   ' INT
    iFirstDay As Integer,   ' INT
    dwFlags As UInteger,   ' DWORD
    pbstrOut As IntPtr   ' LPWSTR* out
) As Integer
End Function

' iWeekday : INT
' fAbbrev : INT
' iFirstDay : INT
' dwFlags : DWORD
' pbstrOut : LPWSTR* out
Declare PtrSafe Function VarWeekdayName Lib "oleaut32" ( _
    ByVal iWeekday As Long, _
    ByVal fAbbrev As Long, _
    ByVal iFirstDay As Long, _
    ByVal dwFlags As Long, _
    ByVal pbstrOut As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

VarWeekdayName = ctypes.windll.oleaut32.VarWeekdayName
VarWeekdayName.restype = ctypes.c_int
VarWeekdayName.argtypes = [
    ctypes.c_int,  # iWeekday : INT
    ctypes.c_int,  # fAbbrev : INT
    ctypes.c_int,  # iFirstDay : INT
    wintypes.DWORD,  # dwFlags : DWORD
    ctypes.c_void_p,  # pbstrOut : LPWSTR* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarWeekdayName = Fiddle::Function.new(
  lib['VarWeekdayName'],
  [
    Fiddle::TYPE_INT,  # iWeekday : INT
    Fiddle::TYPE_INT,  # fAbbrev : INT
    Fiddle::TYPE_INT,  # iFirstDay : INT
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # pbstrOut : LPWSTR* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarWeekdayName(
        iWeekday: i32,  // INT
        fAbbrev: i32,  // INT
        iFirstDay: i32,  // INT
        dwFlags: u32,  // DWORD
        pbstrOut: *mut *mut u16  // LPWSTR* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarWeekdayName(int iWeekday, int fAbbrev, int iFirstDay, uint dwFlags, IntPtr pbstrOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarWeekdayName' -Namespace Win32 -PassThru
# $api::VarWeekdayName(iWeekday, fAbbrev, iFirstDay, dwFlags, pbstrOut)

#uselib "OLEAUT32.dll"
#func global VarWeekdayName "VarWeekdayName" sptr, sptr, sptr, sptr, sptr
; VarWeekdayName iWeekday, fAbbrev, iFirstDay, dwFlags, varptr(pbstrOut)   ; 戻り値は stat
; iWeekday : INT -> "sptr"
; fAbbrev : INT -> "sptr"
; iFirstDay : INT -> "sptr"
; dwFlags : DWORD -> "sptr"
; pbstrOut : LPWSTR* out -> "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 (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procVarWeekdayName = oleaut32.NewProc("VarWeekdayName")
)

// iWeekday (INT), fAbbrev (INT), iFirstDay (INT), dwFlags (DWORD), pbstrOut (LPWSTR* out)
r1, _, err := procVarWeekdayName.Call(
	uintptr(iWeekday),
	uintptr(fAbbrev),
	uintptr(iFirstDay),
	uintptr(dwFlags),
	uintptr(pbstrOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VarWeekdayName(
  iWeekday: Integer;   // INT
  fAbbrev: Integer;   // INT
  iFirstDay: Integer;   // INT
  dwFlags: DWORD;   // DWORD
  pbstrOut: PPWideChar   // LPWSTR* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarWeekdayName';

result := DllCall("OLEAUT32\VarWeekdayName"
    , "Int", iWeekday   ; INT
    , "Int", fAbbrev   ; INT
    , "Int", iFirstDay   ; INT
    , "UInt", dwFlags   ; DWORD
    , "Ptr", pbstrOut   ; LPWSTR* out
    , "Int")   ; return: HRESULT

●VarWeekdayName(iWeekday, fAbbrev, iFirstDay, dwFlags, pbstrOut) = DLL("OLEAUT32.dll", "int VarWeekdayName(int, int, int, dword, void*)")
# 呼び出し: VarWeekdayName(iWeekday, fAbbrev, iFirstDay, dwFlags, pbstrOut)
# iWeekday : INT -> "int"
# fAbbrev : INT -> "int"
# iFirstDay : INT -> "int"
# dwFlags : DWORD -> "dword"
# pbstrOut : LPWSTR* 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)。

const std = @import("std");

extern "oleaut32" fn VarWeekdayName(
    iWeekday: i32, // INT
    fAbbrev: i32, // INT
    iFirstDay: i32, // INT
    dwFlags: u32, // DWORD
    pbstrOut: [*c][*c]u16 // LPWSTR* out
) callconv(std.os.windows.WINAPI) i32;

proc VarWeekdayName(
    iWeekday: int32,  # INT
    fAbbrev: int32,  # INT
    iFirstDay: int32,  # INT
    dwFlags: uint32,  # DWORD
    pbstrOut: ptr WideCString  # LPWSTR* out
): int32 {.importc: "VarWeekdayName", stdcall, dynlib: "OLEAUT32.dll".}

pragma(lib, "oleaut32");
extern(Windows)
int VarWeekdayName(
    int iWeekday,   // INT
    int fAbbrev,   // INT
    int iFirstDay,   // INT
    uint dwFlags,   // DWORD
    wchar** pbstrOut   // LPWSTR* out
);

ccall((:VarWeekdayName, "OLEAUT32.dll"), stdcall, Int32,
      (Int32, Int32, Int32, UInt32, Ptr{Ptr{UInt16}}),
      iWeekday, fAbbrev, iFirstDay, dwFlags, pbstrOut)
# iWeekday : INT -> Int32
# fAbbrev : INT -> Int32
# iFirstDay : INT -> Int32
# dwFlags : DWORD -> UInt32
# pbstrOut : LPWSTR* out -> Ptr{Ptr{UInt16}}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t VarWeekdayName(
    int32_t iWeekday,
    int32_t fAbbrev,
    int32_t iFirstDay,
    uint32_t dwFlags,
    uint16_t** pbstrOut);
]]
local oleaut32 = ffi.load("oleaut32")
-- oleaut32.VarWeekdayName(iWeekday, fAbbrev, iFirstDay, dwFlags, pbstrOut)
-- iWeekday : INT
-- fAbbrev : INT
-- iFirstDay : INT
-- dwFlags : DWORD
-- pbstrOut : LPWSTR* 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。

const koffi = require('koffi');
const lib = koffi.load('OLEAUT32.dll');
const VarWeekdayName = lib.func('__stdcall', 'VarWeekdayName', 'int32_t', ['int32_t', 'int32_t', 'int32_t', 'uint32_t', 'void *']);
// VarWeekdayName(iWeekday, fAbbrev, iFirstDay, dwFlags, pbstrOut)
// iWeekday : INT -> 'int32_t'
// fAbbrev : INT -> 'int32_t'
// iFirstDay : INT -> 'int32_t'
// dwFlags : DWORD -> 'uint32_t'
// pbstrOut : LPWSTR* out -> 'void *'
// 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("OLEAUT32.dll", {
  VarWeekdayName: { parameters: ["i32", "i32", "i32", "u32", "pointer"], result: "i32" },
});
// lib.symbols.VarWeekdayName(iWeekday, fAbbrev, iFirstDay, dwFlags, pbstrOut)
// iWeekday : INT -> "i32"
// fAbbrev : INT -> "i32"
// iFirstDay : INT -> "i32"
// dwFlags : DWORD -> "u32"
// pbstrOut : LPWSTR* out -> "pointer"
// 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 VarWeekdayName(
    int32_t iWeekday,
    int32_t fAbbrev,
    int32_t iFirstDay,
    uint32_t dwFlags,
    uint16_t** pbstrOut);
C, "OLEAUT32.dll");
// $ffi->VarWeekdayName(iWeekday, fAbbrev, iFirstDay, dwFlags, pbstrOut);
// iWeekday : INT
// fAbbrev : INT
// iFirstDay : INT
// dwFlags : DWORD
// pbstrOut : LPWSTR* 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 Oleaut32 extends StdCallLibrary {
    Oleaut32 INSTANCE = Native.load("oleaut32", Oleaut32.class);
    int VarWeekdayName(
        int iWeekday,   // INT
        int fAbbrev,   // INT
        int iFirstDay,   // INT
        int dwFlags,   // DWORD
        PointerByReference pbstrOut   // LPWSTR* out
    );
}

@[Link("oleaut32")]
lib LibOLEAUT32
  fun VarWeekdayName = VarWeekdayName(
    iWeekday : Int32,   # INT
    fAbbrev : Int32,   # INT
    iFirstDay : Int32,   # INT
    dwFlags : UInt32,   # DWORD
    pbstrOut : UInt16**   # LPWSTR* 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 VarWeekdayNameNative = Int32 Function(Int32, Int32, Int32, Uint32, Pointer<Pointer<Utf16>>);
typedef VarWeekdayNameDart = int Function(int, int, int, int, Pointer<Pointer<Utf16>>);
final VarWeekdayName = DynamicLibrary.open('OLEAUT32.dll')
    .lookupFunction<VarWeekdayNameNative, VarWeekdayNameDart>('VarWeekdayName');
// iWeekday : INT -> Int32
// fAbbrev : INT -> Int32
// iFirstDay : INT -> Int32
// dwFlags : DWORD -> Uint32
// pbstrOut : LPWSTR* out -> Pointer<Pointer<Utf16>>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function VarWeekdayName(
  iWeekday: Integer;   // INT
  fAbbrev: Integer;   // INT
  iFirstDay: Integer;   // INT
  dwFlags: DWORD;   // DWORD
  pbstrOut: PPWideChar   // LPWSTR* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarWeekdayName';

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

foreign import stdcall safe "VarWeekdayName"
  c_VarWeekdayName :: Int32 -> Int32 -> Int32 -> Word32 -> Ptr CWString -> IO Int32
-- iWeekday : INT -> Int32
-- fAbbrev : INT -> Int32
-- iFirstDay : INT -> Int32
-- dwFlags : DWORD -> Word32
-- pbstrOut : LPWSTR* out -> Ptr CWString
-- 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 varweekdayname =
  foreign "VarWeekdayName"
    (int32_t @-> int32_t @-> int32_t @-> uint32_t @-> (ptr (ptr uint16_t)) @-> returning int32_t)
(* iWeekday : INT -> int32_t *)
(* fAbbrev : INT -> int32_t *)
(* iFirstDay : INT -> int32_t *)
(* dwFlags : DWORD -> uint32_t *)
(* pbstrOut : LPWSTR* out -> (ptr (ptr uint16_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 oleaut32 (t "OLEAUT32.dll"))
(cffi:use-foreign-library oleaut32)

(cffi:defcfun ("VarWeekdayName" var-weekday-name :convention :stdcall) :int32
  (i-weekday :int32)   ; INT
  (f-abbrev :int32)   ; INT
  (i-first-day :int32)   ; INT
  (dw-flags :uint32)   ; DWORD
  (pbstr-out :pointer))   ; LPWSTR* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $VarWeekdayName = Win32::API::More->new('OLEAUT32',
    'int VarWeekdayName(int iWeekday, int fAbbrev, int iFirstDay, DWORD dwFlags, LPVOID pbstrOut)');
# my $ret = $VarWeekdayName->Call($iWeekday, $fAbbrev, $iFirstDay, $dwFlags, $pbstrOut);
# iWeekday : INT -> int
# fAbbrev : INT -> int
# iFirstDay : INT -> int
# dwFlags : DWORD -> DWORD
# pbstrOut : LPWSTR* out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。