VariantChangeType

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

HRESULT VariantChangeType(
    VARIANT* pvargDest,
    const VARIANT* pvarSrc,
    VAR_CHANGE_FLAGS wFlags,
    VARENUM vt
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VariantChangeType(
    pvargDest As IntPtr,   ' VARIANT* in/out
    pvarSrc As IntPtr,   ' VARIANT*
    wFlags As UShort,   ' VAR_CHANGE_FLAGS
    vt As UShort   ' VARENUM
) As Integer
End Function

' pvargDest : VARIANT* in/out
' pvarSrc : VARIANT*
' wFlags : VAR_CHANGE_FLAGS
' vt : VARENUM
Declare PtrSafe Function VariantChangeType Lib "oleaut32" ( _
    ByVal pvargDest As LongPtr, _
    ByVal pvarSrc As LongPtr, _
    ByVal wFlags As Integer, _
    ByVal vt As Integer) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

VariantChangeType = ctypes.windll.oleaut32.VariantChangeType
VariantChangeType.restype = ctypes.c_int
VariantChangeType.argtypes = [
    ctypes.c_void_p,  # pvargDest : VARIANT* in/out
    ctypes.c_void_p,  # pvarSrc : VARIANT*
    ctypes.c_ushort,  # wFlags : VAR_CHANGE_FLAGS
    ctypes.c_ushort,  # vt : VARENUM
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VariantChangeType = Fiddle::Function.new(
  lib['VariantChangeType'],
  [
    Fiddle::TYPE_VOIDP,  # pvargDest : VARIANT* in/out
    Fiddle::TYPE_VOIDP,  # pvarSrc : VARIANT*
    -Fiddle::TYPE_SHORT,  # wFlags : VAR_CHANGE_FLAGS
    -Fiddle::TYPE_SHORT,  # vt : VARENUM
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VariantChangeType(
        pvargDest: *mut VARIANT,  // VARIANT* in/out
        pvarSrc: *const VARIANT,  // VARIANT*
        wFlags: u16,  // VAR_CHANGE_FLAGS
        vt: u16  // VARENUM
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VariantChangeType(IntPtr pvargDest, IntPtr pvarSrc, ushort wFlags, ushort vt);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VariantChangeType' -Namespace Win32 -PassThru
# $api::VariantChangeType(pvargDest, pvarSrc, wFlags, vt)

#uselib "OLEAUT32.dll"
#func global VariantChangeType "VariantChangeType" sptr, sptr, sptr, sptr
; VariantChangeType varptr(pvargDest), varptr(pvarSrc), wFlags, vt   ; 戻り値は stat
; pvargDest : VARIANT* in/out -> "sptr"
; pvarSrc : VARIANT* -> "sptr"
; wFlags : VAR_CHANGE_FLAGS -> "sptr"
; vt : VARENUM -> "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")
	procVariantChangeType = oleaut32.NewProc("VariantChangeType")
)

// pvargDest (VARIANT* in/out), pvarSrc (VARIANT*), wFlags (VAR_CHANGE_FLAGS), vt (VARENUM)
r1, _, err := procVariantChangeType.Call(
	uintptr(pvargDest),
	uintptr(pvarSrc),
	uintptr(wFlags),
	uintptr(vt),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VariantChangeType(
  pvargDest: Pointer;   // VARIANT* in/out
  pvarSrc: Pointer;   // VARIANT*
  wFlags: Word;   // VAR_CHANGE_FLAGS
  vt: Word   // VARENUM
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VariantChangeType';

result := DllCall("OLEAUT32\VariantChangeType"
    , "Ptr", pvargDest   ; VARIANT* in/out
    , "Ptr", pvarSrc   ; VARIANT*
    , "UShort", wFlags   ; VAR_CHANGE_FLAGS
    , "UShort", vt   ; VARENUM
    , "Int")   ; return: HRESULT

●VariantChangeType(pvargDest, pvarSrc, wFlags, vt) = DLL("OLEAUT32.dll", "int VariantChangeType(void*, void*, int, int)")
# 呼び出し: VariantChangeType(pvargDest, pvarSrc, wFlags, vt)
# pvargDest : VARIANT* in/out -> "void*"
# pvarSrc : VARIANT* -> "void*"
# wFlags : VAR_CHANGE_FLAGS -> "int"
# vt : VARENUM -> "int"
# 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 VariantChangeType(
    pvargDest: [*c]VARIANT, // VARIANT* in/out
    pvarSrc: [*c]VARIANT, // VARIANT*
    wFlags: u16, // VAR_CHANGE_FLAGS
    vt: u16 // VARENUM
) callconv(std.os.windows.WINAPI) i32;

proc VariantChangeType(
    pvargDest: ptr VARIANT,  # VARIANT* in/out
    pvarSrc: ptr VARIANT,  # VARIANT*
    wFlags: uint16,  # VAR_CHANGE_FLAGS
    vt: uint16  # VARENUM
): int32 {.importc: "VariantChangeType", stdcall, dynlib: "OLEAUT32.dll".}

pragma(lib, "oleaut32");
extern(Windows)
int VariantChangeType(
    VARIANT* pvargDest,   // VARIANT* in/out
    VARIANT* pvarSrc,   // VARIANT*
    ushort wFlags,   // VAR_CHANGE_FLAGS
    ushort vt   // VARENUM
);

ccall((:VariantChangeType, "OLEAUT32.dll"), stdcall, Int32,
      (Ptr{VARIANT}, Ptr{VARIANT}, UInt16, UInt16),
      pvargDest, pvarSrc, wFlags, vt)
# pvargDest : VARIANT* in/out -> Ptr{VARIANT}
# pvarSrc : VARIANT* -> Ptr{VARIANT}
# wFlags : VAR_CHANGE_FLAGS -> UInt16
# vt : VARENUM -> UInt16
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t VariantChangeType(
    void* pvargDest,
    void* pvarSrc,
    uint16_t wFlags,
    uint16_t vt);
]]
local oleaut32 = ffi.load("oleaut32")
-- oleaut32.VariantChangeType(pvargDest, pvarSrc, wFlags, vt)
-- pvargDest : VARIANT* in/out
-- pvarSrc : VARIANT*
-- wFlags : VAR_CHANGE_FLAGS
-- vt : VARENUM
-- 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 VariantChangeType = lib.func('__stdcall', 'VariantChangeType', 'int32_t', ['void *', 'void *', 'uint16_t', 'uint16_t']);
// VariantChangeType(pvargDest, pvarSrc, wFlags, vt)
// pvargDest : VARIANT* in/out -> 'void *'
// pvarSrc : VARIANT* -> 'void *'
// wFlags : VAR_CHANGE_FLAGS -> 'uint16_t'
// vt : VARENUM -> 'uint16_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", {
  VariantChangeType: { parameters: ["pointer", "pointer", "u16", "u16"], result: "i32" },
});
// lib.symbols.VariantChangeType(pvargDest, pvarSrc, wFlags, vt)
// pvargDest : VARIANT* in/out -> "pointer"
// pvarSrc : VARIANT* -> "pointer"
// wFlags : VAR_CHANGE_FLAGS -> "u16"
// vt : VARENUM -> "u16"
// 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 VariantChangeType(
    void* pvargDest,
    void* pvarSrc,
    uint16_t wFlags,
    uint16_t vt);
C, "OLEAUT32.dll");
// $ffi->VariantChangeType(pvargDest, pvarSrc, wFlags, vt);
// pvargDest : VARIANT* in/out
// pvarSrc : VARIANT*
// wFlags : VAR_CHANGE_FLAGS
// vt : VARENUM
// 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 VariantChangeType(
        Pointer pvargDest,   // VARIANT* in/out
        Pointer pvarSrc,   // VARIANT*
        short wFlags,   // VAR_CHANGE_FLAGS
        short vt   // VARENUM
    );
}

@[Link("oleaut32")]
lib LibOLEAUT32
  fun VariantChangeType = VariantChangeType(
    pvargDest : VARIANT*,   # VARIANT* in/out
    pvarSrc : VARIANT*,   # VARIANT*
    wFlags : UInt16,   # VAR_CHANGE_FLAGS
    vt : UInt16   # VARENUM
  ) : 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 VariantChangeTypeNative = Int32 Function(Pointer<Void>, Pointer<Void>, Uint16, Uint16);
typedef VariantChangeTypeDart = int Function(Pointer<Void>, Pointer<Void>, int, int);
final VariantChangeType = DynamicLibrary.open('OLEAUT32.dll')
    .lookupFunction<VariantChangeTypeNative, VariantChangeTypeDart>('VariantChangeType');
// pvargDest : VARIANT* in/out -> Pointer<Void>
// pvarSrc : VARIANT* -> Pointer<Void>
// wFlags : VAR_CHANGE_FLAGS -> Uint16
// vt : VARENUM -> Uint16
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function VariantChangeType(
  pvargDest: Pointer;   // VARIANT* in/out
  pvarSrc: Pointer;   // VARIANT*
  wFlags: Word;   // VAR_CHANGE_FLAGS
  vt: Word   // VARENUM
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VariantChangeType';

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

foreign import stdcall safe "VariantChangeType"
  c_VariantChangeType :: Ptr () -> Ptr () -> Word16 -> Word16 -> IO Int32
-- pvargDest : VARIANT* in/out -> Ptr ()
-- pvarSrc : VARIANT* -> Ptr ()
-- wFlags : VAR_CHANGE_FLAGS -> Word16
-- vt : VARENUM -> Word16
-- 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 variantchangetype =
  foreign "VariantChangeType"
    ((ptr void) @-> (ptr void) @-> uint16_t @-> uint16_t @-> returning int32_t)
(* pvargDest : VARIANT* in/out -> (ptr void) *)
(* pvarSrc : VARIANT* -> (ptr void) *)
(* wFlags : VAR_CHANGE_FLAGS -> uint16_t *)
(* vt : VARENUM -> 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 ("VariantChangeType" variant-change-type :convention :stdcall) :int32
  (pvarg-dest :pointer)   ; VARIANT* in/out
  (pvar-src :pointer)   ; VARIANT*
  (w-flags :uint16)   ; VAR_CHANGE_FLAGS
  (vt :uint16))   ; VARENUM
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $VariantChangeType = Win32::API::More->new('OLEAUT32',
    'int VariantChangeType(LPVOID pvargDest, LPVOID pvarSrc, WORD wFlags, WORD vt)');
# my $ret = $VariantChangeType->Call($pvargDest, $pvarSrc, $wFlags, $vt);
# pvargDest : VARIANT* in/out -> LPVOID
# pvarSrc : VARIANT* -> LPVOID
# wFlags : VAR_CHANGE_FLAGS -> WORD
# vt : VARENUM -> WORD
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。