VariantToUInt64

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

HRESULT VariantToUInt64(
    const VARIANT* varIn,
    ULONGLONG* pullRet
);

<DllImport("PROPSYS.dll", ExactSpelling:=True)>
Public Shared Function VariantToUInt64(
    varIn As IntPtr,   ' VARIANT*
    <Out> ByRef pullRet As ULong   ' ULONGLONG* out
) As Integer
End Function

' varIn : VARIANT*
' pullRet : ULONGLONG* out
Declare PtrSafe Function VariantToUInt64 Lib "propsys" ( _
    ByVal varIn As LongPtr, _
    ByRef pullRet As LongLong) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

VariantToUInt64 = ctypes.windll.propsys.VariantToUInt64
VariantToUInt64.restype = ctypes.c_int
VariantToUInt64.argtypes = [
    ctypes.c_void_p,  # varIn : VARIANT*
    ctypes.POINTER(ctypes.c_ulonglong),  # pullRet : ULONGLONG* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('PROPSYS.dll')
VariantToUInt64 = Fiddle::Function.new(
  lib['VariantToUInt64'],
  [
    Fiddle::TYPE_VOIDP,  # varIn : VARIANT*
    Fiddle::TYPE_VOIDP,  # pullRet : ULONGLONG* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "propsys")]
extern "system" {
    fn VariantToUInt64(
        varIn: *const VARIANT,  // VARIANT*
        pullRet: *mut u64  // ULONGLONG* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("PROPSYS.dll")]
public static extern int VariantToUInt64(IntPtr varIn, out ulong pullRet);
"@
$api = Add-Type -MemberDefinition $sig -Name 'PROPSYS_VariantToUInt64' -Namespace Win32 -PassThru
# $api::VariantToUInt64(varIn, pullRet)

#uselib "PROPSYS.dll"
#func global VariantToUInt64 "VariantToUInt64" sptr, sptr
; VariantToUInt64 varptr(varIn), varptr(pullRet)   ; 戻り値は stat
; varIn : VARIANT* -> "sptr"
; pullRet : ULONGLONG* 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 (
	propsys = windows.NewLazySystemDLL("PROPSYS.dll")
	procVariantToUInt64 = propsys.NewProc("VariantToUInt64")
)

// varIn (VARIANT*), pullRet (ULONGLONG* out)
r1, _, err := procVariantToUInt64.Call(
	uintptr(varIn),
	uintptr(pullRet),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VariantToUInt64(
  varIn: Pointer;   // VARIANT*
  pullRet: Pointer   // ULONGLONG* out
): Integer; stdcall;
  external 'PROPSYS.dll' name 'VariantToUInt64';

result := DllCall("PROPSYS\VariantToUInt64"
    , "Ptr", varIn   ; VARIANT*
    , "Ptr", pullRet   ; ULONGLONG* out
    , "Int")   ; return: HRESULT

●VariantToUInt64(varIn, pullRet) = DLL("PROPSYS.dll", "int VariantToUInt64(void*, void*)")
# 呼び出し: VariantToUInt64(varIn, pullRet)
# varIn : VARIANT* -> "void*"
# pullRet : ULONGLONG* 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 "propsys" fn VariantToUInt64(
    varIn: [*c]VARIANT, // VARIANT*
    pullRet: [*c]u64 // ULONGLONG* out
) callconv(std.os.windows.WINAPI) i32;

proc VariantToUInt64(
    varIn: ptr VARIANT,  # VARIANT*
    pullRet: ptr uint64  # ULONGLONG* out
): int32 {.importc: "VariantToUInt64", stdcall, dynlib: "PROPSYS.dll".}

pragma(lib, "propsys");
extern(Windows)
int VariantToUInt64(
    VARIANT* varIn,   // VARIANT*
    ulong* pullRet   // ULONGLONG* out
);

ccall((:VariantToUInt64, "PROPSYS.dll"), stdcall, Int32,
      (Ptr{VARIANT}, Ptr{UInt64}),
      varIn, pullRet)
# varIn : VARIANT* -> Ptr{VARIANT}
# pullRet : ULONGLONG* out -> Ptr{UInt64}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t VariantToUInt64(
    void* varIn,
    uint64_t* pullRet);
]]
local propsys = ffi.load("propsys")
-- propsys.VariantToUInt64(varIn, pullRet)
-- varIn : VARIANT*
-- pullRet : ULONGLONG* 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('PROPSYS.dll');
const VariantToUInt64 = lib.func('__stdcall', 'VariantToUInt64', 'int32_t', ['void *', 'uint64_t *']);
// VariantToUInt64(varIn, pullRet)
// varIn : VARIANT* -> 'void *'
// pullRet : ULONGLONG* out -> 'uint64_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("PROPSYS.dll", {
  VariantToUInt64: { parameters: ["pointer", "pointer"], result: "i32" },
});
// lib.symbols.VariantToUInt64(varIn, pullRet)
// varIn : VARIANT* -> "pointer"
// pullRet : ULONGLONG* 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 VariantToUInt64(
    void* varIn,
    uint64_t* pullRet);
C, "PROPSYS.dll");
// $ffi->VariantToUInt64(varIn, pullRet);
// varIn : VARIANT*
// pullRet : ULONGLONG* 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 Propsys extends StdCallLibrary {
    Propsys INSTANCE = Native.load("propsys", Propsys.class);
    int VariantToUInt64(
        Pointer varIn,   // VARIANT*
        LongByReference pullRet   // ULONGLONG* out
    );
}

@[Link("propsys")]
lib LibPROPSYS
  fun VariantToUInt64 = VariantToUInt64(
    varIn : VARIANT*,   # VARIANT*
    pullRet : UInt64*   # ULONGLONG* 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 VariantToUInt64Native = Int32 Function(Pointer<Void>, Pointer<Uint64>);
typedef VariantToUInt64Dart = int Function(Pointer<Void>, Pointer<Uint64>);
final VariantToUInt64 = DynamicLibrary.open('PROPSYS.dll')
    .lookupFunction<VariantToUInt64Native, VariantToUInt64Dart>('VariantToUInt64');
// varIn : VARIANT* -> Pointer<Void>
// pullRet : ULONGLONG* out -> Pointer<Uint64>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function VariantToUInt64(
  varIn: Pointer;   // VARIANT*
  pullRet: Pointer   // ULONGLONG* out
): Integer; stdcall;
  external 'PROPSYS.dll' name 'VariantToUInt64';

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

foreign import stdcall safe "VariantToUInt64"
  c_VariantToUInt64 :: Ptr () -> Ptr Word64 -> IO Int32
-- varIn : VARIANT* -> Ptr ()
-- pullRet : ULONGLONG* out -> Ptr Word64
-- 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 varianttouint64 =
  foreign "VariantToUInt64"
    ((ptr void) @-> (ptr uint64_t) @-> returning int32_t)
(* varIn : VARIANT* -> (ptr void) *)
(* pullRet : ULONGLONG* out -> (ptr uint64_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 propsys (t "PROPSYS.dll"))
(cffi:use-foreign-library propsys)

(cffi:defcfun ("VariantToUInt64" variant-to-uint64 :convention :stdcall) :int32
  (var-in :pointer)   ; VARIANT*
  (pull-ret :pointer))   ; ULONGLONG* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $VariantToUInt64 = Win32::API::More->new('PROPSYS',
    'int VariantToUInt64(LPVOID varIn, LPVOID pullRet)');
# my $ret = $VariantToUInt64->Call($varIn, $pullRet);
# varIn : VARIANT* -> LPVOID
# pullRet : ULONGLONG* out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。