VarRound

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

HRESULT VarRound(
    VARIANT* pvarIn,
    INT cDecimals,
    VARIANT* pvarResult
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarRound(
    pvarIn As IntPtr,   ' VARIANT*
    cDecimals As Integer,   ' INT
    pvarResult As IntPtr   ' VARIANT* out
) As Integer
End Function

' pvarIn : VARIANT*
' cDecimals : INT
' pvarResult : VARIANT* out
Declare PtrSafe Function VarRound Lib "oleaut32" ( _
    ByVal pvarIn As LongPtr, _
    ByVal cDecimals As Long, _
    ByVal pvarResult 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

VarRound = ctypes.windll.oleaut32.VarRound
VarRound.restype = ctypes.c_int
VarRound.argtypes = [
    ctypes.c_void_p,  # pvarIn : VARIANT*
    ctypes.c_int,  # cDecimals : INT
    ctypes.c_void_p,  # pvarResult : VARIANT* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarRound = Fiddle::Function.new(
  lib['VarRound'],
  [
    Fiddle::TYPE_VOIDP,  # pvarIn : VARIANT*
    Fiddle::TYPE_INT,  # cDecimals : INT
    Fiddle::TYPE_VOIDP,  # pvarResult : VARIANT* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarRound(
        pvarIn: *mut VARIANT,  // VARIANT*
        cDecimals: i32,  // INT
        pvarResult: *mut VARIANT  // VARIANT* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarRound(IntPtr pvarIn, int cDecimals, IntPtr pvarResult);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarRound' -Namespace Win32 -PassThru
# $api::VarRound(pvarIn, cDecimals, pvarResult)

#uselib "OLEAUT32.dll"
#func global VarRound "VarRound" sptr, sptr, sptr
; VarRound varptr(pvarIn), cDecimals, varptr(pvarResult)   ; 戻り値は stat
; pvarIn : VARIANT* -> "sptr"
; cDecimals : INT -> "sptr"
; pvarResult : VARIANT* 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")
	procVarRound = oleaut32.NewProc("VarRound")
)

// pvarIn (VARIANT*), cDecimals (INT), pvarResult (VARIANT* out)
r1, _, err := procVarRound.Call(
	uintptr(pvarIn),
	uintptr(cDecimals),
	uintptr(pvarResult),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VarRound(
  pvarIn: Pointer;   // VARIANT*
  cDecimals: Integer;   // INT
  pvarResult: Pointer   // VARIANT* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarRound';

result := DllCall("OLEAUT32\VarRound"
    , "Ptr", pvarIn   ; VARIANT*
    , "Int", cDecimals   ; INT
    , "Ptr", pvarResult   ; VARIANT* out
    , "Int")   ; return: HRESULT

●VarRound(pvarIn, cDecimals, pvarResult) = DLL("OLEAUT32.dll", "int VarRound(void*, int, void*)")
# 呼び出し: VarRound(pvarIn, cDecimals, pvarResult)
# pvarIn : VARIANT* -> "void*"
# cDecimals : INT -> "int"
# pvarResult : VARIANT* 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 VarRound(
    pvarIn: [*c]VARIANT, // VARIANT*
    cDecimals: i32, // INT
    pvarResult: [*c]VARIANT // VARIANT* out
) callconv(std.os.windows.WINAPI) i32;

proc VarRound(
    pvarIn: ptr VARIANT,  # VARIANT*
    cDecimals: int32,  # INT
    pvarResult: ptr VARIANT  # VARIANT* out
): int32 {.importc: "VarRound", stdcall, dynlib: "OLEAUT32.dll".}

pragma(lib, "oleaut32");
extern(Windows)
int VarRound(
    VARIANT* pvarIn,   // VARIANT*
    int cDecimals,   // INT
    VARIANT* pvarResult   // VARIANT* out
);

ccall((:VarRound, "OLEAUT32.dll"), stdcall, Int32,
      (Ptr{VARIANT}, Int32, Ptr{VARIANT}),
      pvarIn, cDecimals, pvarResult)
# pvarIn : VARIANT* -> Ptr{VARIANT}
# cDecimals : INT -> Int32
# pvarResult : VARIANT* out -> Ptr{VARIANT}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t VarRound(
    void* pvarIn,
    int32_t cDecimals,
    void* pvarResult);
]]
local oleaut32 = ffi.load("oleaut32")
-- oleaut32.VarRound(pvarIn, cDecimals, pvarResult)
-- pvarIn : VARIANT*
-- cDecimals : INT
-- pvarResult : VARIANT* 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 VarRound = lib.func('__stdcall', 'VarRound', 'int32_t', ['void *', 'int32_t', 'void *']);
// VarRound(pvarIn, cDecimals, pvarResult)
// pvarIn : VARIANT* -> 'void *'
// cDecimals : INT -> 'int32_t'
// pvarResult : VARIANT* 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", {
  VarRound: { parameters: ["pointer", "i32", "pointer"], result: "i32" },
});
// lib.symbols.VarRound(pvarIn, cDecimals, pvarResult)
// pvarIn : VARIANT* -> "pointer"
// cDecimals : INT -> "i32"
// pvarResult : VARIANT* 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 VarRound(
    void* pvarIn,
    int32_t cDecimals,
    void* pvarResult);
C, "OLEAUT32.dll");
// $ffi->VarRound(pvarIn, cDecimals, pvarResult);
// pvarIn : VARIANT*
// cDecimals : INT
// pvarResult : VARIANT* 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 VarRound(
        Pointer pvarIn,   // VARIANT*
        int cDecimals,   // INT
        Pointer pvarResult   // VARIANT* out
    );
}

@[Link("oleaut32")]
lib LibOLEAUT32
  fun VarRound = VarRound(
    pvarIn : VARIANT*,   # VARIANT*
    cDecimals : Int32,   # INT
    pvarResult : VARIANT*   # VARIANT* 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 VarRoundNative = Int32 Function(Pointer<Void>, Int32, Pointer<Void>);
typedef VarRoundDart = int Function(Pointer<Void>, int, Pointer<Void>);
final VarRound = DynamicLibrary.open('OLEAUT32.dll')
    .lookupFunction<VarRoundNative, VarRoundDart>('VarRound');
// pvarIn : VARIANT* -> Pointer<Void>
// cDecimals : INT -> Int32
// pvarResult : VARIANT* out -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function VarRound(
  pvarIn: Pointer;   // VARIANT*
  cDecimals: Integer;   // INT
  pvarResult: Pointer   // VARIANT* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarRound';

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

foreign import stdcall safe "VarRound"
  c_VarRound :: Ptr () -> Int32 -> Ptr () -> IO Int32
-- pvarIn : VARIANT* -> Ptr ()
-- cDecimals : INT -> Int32
-- pvarResult : VARIANT* 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 varround =
  foreign "VarRound"
    ((ptr void) @-> int32_t @-> (ptr void) @-> returning int32_t)
(* pvarIn : VARIANT* -> (ptr void) *)
(* cDecimals : INT -> int32_t *)
(* pvarResult : VARIANT* 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 ("VarRound" var-round :convention :stdcall) :int32
  (pvar-in :pointer)   ; VARIANT*
  (c-decimals :int32)   ; INT
  (pvar-result :pointer))   ; VARIANT* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

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