VarI4FromDec

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

HRESULT VarI4FromDec(
    const DECIMAL* pdecIn,
    INT* plOut
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarI4FromDec(
    pdecIn As IntPtr,   ' DECIMAL*
    <Out> ByRef plOut As Integer   ' INT* out
) As Integer
End Function

' pdecIn : DECIMAL*
' plOut : INT* out
Declare PtrSafe Function VarI4FromDec Lib "oleaut32" ( _
    ByVal pdecIn As LongPtr, _
    ByRef plOut 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

VarI4FromDec = ctypes.windll.oleaut32.VarI4FromDec
VarI4FromDec.restype = ctypes.c_int
VarI4FromDec.argtypes = [
    ctypes.c_void_p,  # pdecIn : DECIMAL*
    ctypes.POINTER(ctypes.c_int),  # plOut : INT* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarI4FromDec = Fiddle::Function.new(
  lib['VarI4FromDec'],
  [
    Fiddle::TYPE_VOIDP,  # pdecIn : DECIMAL*
    Fiddle::TYPE_VOIDP,  # plOut : INT* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarI4FromDec(
        pdecIn: *const DECIMAL,  // DECIMAL*
        plOut: *mut i32  // INT* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarI4FromDec(IntPtr pdecIn, out int plOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarI4FromDec' -Namespace Win32 -PassThru
# $api::VarI4FromDec(pdecIn, plOut)

#uselib "OLEAUT32.dll"
#func global VarI4FromDec "VarI4FromDec" sptr, sptr
; VarI4FromDec varptr(pdecIn), varptr(plOut)   ; 戻り値は stat
; pdecIn : DECIMAL* -> "sptr"
; plOut : INT* 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")
	procVarI4FromDec = oleaut32.NewProc("VarI4FromDec")
)

// pdecIn (DECIMAL*), plOut (INT* out)
r1, _, err := procVarI4FromDec.Call(
	uintptr(pdecIn),
	uintptr(plOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VarI4FromDec(
  pdecIn: Pointer;   // DECIMAL*
  plOut: Pointer   // INT* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarI4FromDec';

result := DllCall("OLEAUT32\VarI4FromDec"
    , "Ptr", pdecIn   ; DECIMAL*
    , "Ptr", plOut   ; INT* out
    , "Int")   ; return: HRESULT

●VarI4FromDec(pdecIn, plOut) = DLL("OLEAUT32.dll", "int VarI4FromDec(void*, void*)")
# 呼び出し: VarI4FromDec(pdecIn, plOut)
# pdecIn : DECIMAL* -> "void*"
# plOut : INT* 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 VarI4FromDec(
    pdecIn: [*c]DECIMAL, // DECIMAL*
    plOut: [*c]i32 // INT* out
) callconv(std.os.windows.WINAPI) i32;

proc VarI4FromDec(
    pdecIn: ptr DECIMAL,  # DECIMAL*
    plOut: ptr int32  # INT* out
): int32 {.importc: "VarI4FromDec", stdcall, dynlib: "OLEAUT32.dll".}

pragma(lib, "oleaut32");
extern(Windows)
int VarI4FromDec(
    DECIMAL* pdecIn,   // DECIMAL*
    int* plOut   // INT* out
);

ccall((:VarI4FromDec, "OLEAUT32.dll"), stdcall, Int32,
      (Ptr{DECIMAL}, Ptr{Int32}),
      pdecIn, plOut)
# pdecIn : DECIMAL* -> Ptr{DECIMAL}
# plOut : INT* out -> Ptr{Int32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t VarI4FromDec(
    void* pdecIn,
    int32_t* plOut);
]]
local oleaut32 = ffi.load("oleaut32")
-- oleaut32.VarI4FromDec(pdecIn, plOut)
-- pdecIn : DECIMAL*
-- plOut : INT* 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 VarI4FromDec = lib.func('__stdcall', 'VarI4FromDec', 'int32_t', ['void *', 'int32_t *']);
// VarI4FromDec(pdecIn, plOut)
// pdecIn : DECIMAL* -> 'void *'
// plOut : INT* out -> 'int32_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("OLEAUT32.dll", {
  VarI4FromDec: { parameters: ["pointer", "pointer"], result: "i32" },
});
// lib.symbols.VarI4FromDec(pdecIn, plOut)
// pdecIn : DECIMAL* -> "pointer"
// plOut : INT* 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 VarI4FromDec(
    void* pdecIn,
    int32_t* plOut);
C, "OLEAUT32.dll");
// $ffi->VarI4FromDec(pdecIn, plOut);
// pdecIn : DECIMAL*
// plOut : INT* 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 VarI4FromDec(
        Pointer pdecIn,   // DECIMAL*
        IntByReference plOut   // INT* out
    );
}

@[Link("oleaut32")]
lib LibOLEAUT32
  fun VarI4FromDec = VarI4FromDec(
    pdecIn : DECIMAL*,   # DECIMAL*
    plOut : Int32*   # INT* 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 VarI4FromDecNative = Int32 Function(Pointer<Void>, Pointer<Int32>);
typedef VarI4FromDecDart = int Function(Pointer<Void>, Pointer<Int32>);
final VarI4FromDec = DynamicLibrary.open('OLEAUT32.dll')
    .lookupFunction<VarI4FromDecNative, VarI4FromDecDart>('VarI4FromDec');
// pdecIn : DECIMAL* -> Pointer<Void>
// plOut : INT* out -> Pointer<Int32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function VarI4FromDec(
  pdecIn: Pointer;   // DECIMAL*
  plOut: Pointer   // INT* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarI4FromDec';

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

foreign import stdcall safe "VarI4FromDec"
  c_VarI4FromDec :: Ptr () -> Ptr Int32 -> IO Int32
-- pdecIn : DECIMAL* -> Ptr ()
-- plOut : INT* out -> Ptr Int32
-- 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 vari4fromdec =
  foreign "VarI4FromDec"
    ((ptr void) @-> (ptr int32_t) @-> returning int32_t)
(* pdecIn : DECIMAL* -> (ptr void) *)
(* plOut : INT* out -> (ptr int32_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 ("VarI4FromDec" var-i4-from-dec :convention :stdcall) :int32
  (pdec-in :pointer)   ; DECIMAL*
  (pl-out :pointer))   ; INT* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $VarI4FromDec = Win32::API::More->new('OLEAUT32',
    'int VarI4FromDec(LPVOID pdecIn, LPVOID plOut)');
# my $ret = $VarI4FromDec->Call($pdecIn, $plOut);
# pdecIn : DECIMAL* -> LPVOID
# plOut : INT* out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。