VarDecFromUI8

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

HRESULT VarDecFromUI8(
    ULONGLONG ui64In,
    DECIMAL* pdecOut
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarDecFromUI8(
    ui64In As ULong,   ' ULONGLONG
    pdecOut As IntPtr   ' DECIMAL* out
) As Integer
End Function

' ui64In : ULONGLONG
' pdecOut : DECIMAL* out
Declare PtrSafe Function VarDecFromUI8 Lib "oleaut32" ( _
    ByVal ui64In As LongLong, _
    ByVal pdecOut 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

VarDecFromUI8 = ctypes.windll.oleaut32.VarDecFromUI8
VarDecFromUI8.restype = ctypes.c_int
VarDecFromUI8.argtypes = [
    ctypes.c_ulonglong,  # ui64In : ULONGLONG
    ctypes.c_void_p,  # pdecOut : DECIMAL* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarDecFromUI8 = Fiddle::Function.new(
  lib['VarDecFromUI8'],
  [
    -Fiddle::TYPE_LONG_LONG,  # ui64In : ULONGLONG
    Fiddle::TYPE_VOIDP,  # pdecOut : DECIMAL* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarDecFromUI8(
        ui64In: u64,  // ULONGLONG
        pdecOut: *mut DECIMAL  // DECIMAL* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarDecFromUI8(ulong ui64In, IntPtr pdecOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarDecFromUI8' -Namespace Win32 -PassThru
# $api::VarDecFromUI8(ui64In, pdecOut)

#uselib "OLEAUT32.dll"
#func global VarDecFromUI8 "VarDecFromUI8" sptr, sptr
; VarDecFromUI8 ui64In, varptr(pdecOut)   ; 戻り値は stat
; ui64In : ULONGLONG -> "sptr"
; pdecOut : DECIMAL* out -> "sptr"
; ※HSP3.7は int64 引数(64bit値渡し)に非対応です。
; ※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")
	procVarDecFromUI8 = oleaut32.NewProc("VarDecFromUI8")
)

// ui64In (ULONGLONG), pdecOut (DECIMAL* out)
r1, _, err := procVarDecFromUI8.Call(
	uintptr(ui64In),
	uintptr(pdecOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VarDecFromUI8(
  ui64In: UInt64;   // ULONGLONG
  pdecOut: Pointer   // DECIMAL* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarDecFromUI8';

result := DllCall("OLEAUT32\VarDecFromUI8"
    , "Int64", ui64In   ; ULONGLONG
    , "Ptr", pdecOut   ; DECIMAL* out
    , "Int")   ; return: HRESULT

●VarDecFromUI8(ui64In, pdecOut) = DLL("OLEAUT32.dll", "int VarDecFromUI8(qword, void*)")
# 呼び出し: VarDecFromUI8(ui64In, pdecOut)
# ui64In : ULONGLONG -> "qword"
# pdecOut : DECIMAL* 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 VarDecFromUI8(
    ui64In: u64, // ULONGLONG
    pdecOut: [*c]DECIMAL // DECIMAL* out
) callconv(std.os.windows.WINAPI) i32;

proc VarDecFromUI8(
    ui64In: uint64,  # ULONGLONG
    pdecOut: ptr DECIMAL  # DECIMAL* out
): int32 {.importc: "VarDecFromUI8", stdcall, dynlib: "OLEAUT32.dll".}

pragma(lib, "oleaut32");
extern(Windows)
int VarDecFromUI8(
    ulong ui64In,   // ULONGLONG
    DECIMAL* pdecOut   // DECIMAL* out
);

ccall((:VarDecFromUI8, "OLEAUT32.dll"), stdcall, Int32,
      (UInt64, Ptr{DECIMAL}),
      ui64In, pdecOut)
# ui64In : ULONGLONG -> UInt64
# pdecOut : DECIMAL* out -> Ptr{DECIMAL}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t VarDecFromUI8(
    uint64_t ui64In,
    void* pdecOut);
]]
local oleaut32 = ffi.load("oleaut32")
-- oleaut32.VarDecFromUI8(ui64In, pdecOut)
-- ui64In : ULONGLONG
-- pdecOut : DECIMAL* 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 VarDecFromUI8 = lib.func('__stdcall', 'VarDecFromUI8', 'int32_t', ['uint64_t', 'void *']);
// VarDecFromUI8(ui64In, pdecOut)
// ui64In : ULONGLONG -> 'uint64_t'
// pdecOut : DECIMAL* 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", {
  VarDecFromUI8: { parameters: ["u64", "pointer"], result: "i32" },
});
// lib.symbols.VarDecFromUI8(ui64In, pdecOut)
// ui64In : ULONGLONG -> "u64"
// pdecOut : DECIMAL* 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 VarDecFromUI8(
    uint64_t ui64In,
    void* pdecOut);
C, "OLEAUT32.dll");
// $ffi->VarDecFromUI8(ui64In, pdecOut);
// ui64In : ULONGLONG
// pdecOut : DECIMAL* 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 VarDecFromUI8(
        long ui64In,   // ULONGLONG
        Pointer pdecOut   // DECIMAL* out
    );
}

@[Link("oleaut32")]
lib LibOLEAUT32
  fun VarDecFromUI8 = VarDecFromUI8(
    ui64In : UInt64,   # ULONGLONG
    pdecOut : DECIMAL*   # DECIMAL* 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 VarDecFromUI8Native = Int32 Function(Uint64, Pointer<Void>);
typedef VarDecFromUI8Dart = int Function(int, Pointer<Void>);
final VarDecFromUI8 = DynamicLibrary.open('OLEAUT32.dll')
    .lookupFunction<VarDecFromUI8Native, VarDecFromUI8Dart>('VarDecFromUI8');
// ui64In : ULONGLONG -> Uint64
// pdecOut : DECIMAL* out -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function VarDecFromUI8(
  ui64In: UInt64;   // ULONGLONG
  pdecOut: Pointer   // DECIMAL* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarDecFromUI8';

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

foreign import stdcall safe "VarDecFromUI8"
  c_VarDecFromUI8 :: Word64 -> Ptr () -> IO Int32
-- ui64In : ULONGLONG -> Word64
-- pdecOut : DECIMAL* out -> Ptr ()
-- 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 vardecfromui8 =
  foreign "VarDecFromUI8"
    (uint64_t @-> (ptr void) @-> returning int32_t)
(* ui64In : ULONGLONG -> uint64_t *)
(* pdecOut : DECIMAL* out -> (ptr void) *)
(* 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 ("VarDecFromUI8" var-dec-from-ui8 :convention :stdcall) :int32
  (ui64-in :uint64)   ; ULONGLONG
  (pdec-out :pointer))   ; DECIMAL* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $VarDecFromUI8 = Win32::API::More->new('OLEAUT32',
    'int VarDecFromUI8(UINT64 ui64In, LPVOID pdecOut)');
# my $ret = $VarDecFromUI8->Call($ui64In, $pdecOut);
# ui64In : ULONGLONG -> UINT64
# pdecOut : DECIMAL* out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。