VarR8FromUI8

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

HRESULT VarR8FromUI8(
    ULONGLONG ui64In,
    DOUBLE* pdblOut
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarR8FromUI8(
    ui64In As ULong,   ' ULONGLONG
    <Out> ByRef pdblOut As Double   ' DOUBLE* out
) As Integer
End Function

' ui64In : ULONGLONG
' pdblOut : DOUBLE* out
Declare PtrSafe Function VarR8FromUI8 Lib "oleaut32" ( _
    ByVal ui64In As LongLong, _
    ByRef pdblOut As Double) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

VarR8FromUI8 = ctypes.windll.oleaut32.VarR8FromUI8
VarR8FromUI8.restype = ctypes.c_int
VarR8FromUI8.argtypes = [
    ctypes.c_ulonglong,  # ui64In : ULONGLONG
    ctypes.POINTER(ctypes.c_double),  # pdblOut : DOUBLE* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarR8FromUI8 = Fiddle::Function.new(
  lib['VarR8FromUI8'],
  [
    -Fiddle::TYPE_LONG_LONG,  # ui64In : ULONGLONG
    Fiddle::TYPE_VOIDP,  # pdblOut : DOUBLE* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarR8FromUI8(
        ui64In: u64,  // ULONGLONG
        pdblOut: *mut f64  // DOUBLE* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarR8FromUI8(ulong ui64In, out double pdblOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarR8FromUI8' -Namespace Win32 -PassThru
# $api::VarR8FromUI8(ui64In, pdblOut)

#uselib "OLEAUT32.dll"
#func global VarR8FromUI8 "VarR8FromUI8" sptr, sptr
; VarR8FromUI8 ui64In, varptr(pdblOut)   ; 戻り値は stat
; ui64In : ULONGLONG -> "sptr"
; pdblOut : DOUBLE* 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")
	procVarR8FromUI8 = oleaut32.NewProc("VarR8FromUI8")
)

// ui64In (ULONGLONG), pdblOut (DOUBLE* out)
r1, _, err := procVarR8FromUI8.Call(
	uintptr(ui64In),
	uintptr(pdblOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VarR8FromUI8(
  ui64In: UInt64;   // ULONGLONG
  pdblOut: Pointer   // DOUBLE* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarR8FromUI8';

result := DllCall("OLEAUT32\VarR8FromUI8"
    , "Int64", ui64In   ; ULONGLONG
    , "Ptr", pdblOut   ; DOUBLE* out
    , "Int")   ; return: HRESULT

●VarR8FromUI8(ui64In, pdblOut) = DLL("OLEAUT32.dll", "int VarR8FromUI8(qword, void*)")
# 呼び出し: VarR8FromUI8(ui64In, pdblOut)
# ui64In : ULONGLONG -> "qword"
# pdblOut : DOUBLE* 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 VarR8FromUI8(
    ui64In: u64, // ULONGLONG
    pdblOut: [*c]f64 // DOUBLE* out
) callconv(std.os.windows.WINAPI) i32;

proc VarR8FromUI8(
    ui64In: uint64,  # ULONGLONG
    pdblOut: ptr float64  # DOUBLE* out
): int32 {.importc: "VarR8FromUI8", stdcall, dynlib: "OLEAUT32.dll".}

pragma(lib, "oleaut32");
extern(Windows)
int VarR8FromUI8(
    ulong ui64In,   // ULONGLONG
    double* pdblOut   // DOUBLE* out
);

ccall((:VarR8FromUI8, "OLEAUT32.dll"), stdcall, Int32,
      (UInt64, Ptr{Float64}),
      ui64In, pdblOut)
# ui64In : ULONGLONG -> UInt64
# pdblOut : DOUBLE* out -> Ptr{Float64}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t VarR8FromUI8(
    uint64_t ui64In,
    double* pdblOut);
]]
local oleaut32 = ffi.load("oleaut32")
-- oleaut32.VarR8FromUI8(ui64In, pdblOut)
-- ui64In : ULONGLONG
-- pdblOut : DOUBLE* 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 VarR8FromUI8 = lib.func('__stdcall', 'VarR8FromUI8', 'int32_t', ['uint64_t', 'double *']);
// VarR8FromUI8(ui64In, pdblOut)
// ui64In : ULONGLONG -> 'uint64_t'
// pdblOut : DOUBLE* out -> 'double *'
// 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", {
  VarR8FromUI8: { parameters: ["u64", "pointer"], result: "i32" },
});
// lib.symbols.VarR8FromUI8(ui64In, pdblOut)
// ui64In : ULONGLONG -> "u64"
// pdblOut : DOUBLE* 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 VarR8FromUI8(
    uint64_t ui64In,
    double* pdblOut);
C, "OLEAUT32.dll");
// $ffi->VarR8FromUI8(ui64In, pdblOut);
// ui64In : ULONGLONG
// pdblOut : DOUBLE* 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 VarR8FromUI8(
        long ui64In,   // ULONGLONG
        DoubleByReference pdblOut   // DOUBLE* out
    );
}

@[Link("oleaut32")]
lib LibOLEAUT32
  fun VarR8FromUI8 = VarR8FromUI8(
    ui64In : UInt64,   # ULONGLONG
    pdblOut : Float64*   # DOUBLE* 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 VarR8FromUI8Native = Int32 Function(Uint64, Pointer<Double>);
typedef VarR8FromUI8Dart = int Function(int, Pointer<Double>);
final VarR8FromUI8 = DynamicLibrary.open('OLEAUT32.dll')
    .lookupFunction<VarR8FromUI8Native, VarR8FromUI8Dart>('VarR8FromUI8');
// ui64In : ULONGLONG -> Uint64
// pdblOut : DOUBLE* out -> Pointer<Double>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function VarR8FromUI8(
  ui64In: UInt64;   // ULONGLONG
  pdblOut: Pointer   // DOUBLE* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarR8FromUI8';

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

foreign import stdcall safe "VarR8FromUI8"
  c_VarR8FromUI8 :: Word64 -> Ptr CDouble -> IO Int32
-- ui64In : ULONGLONG -> Word64
-- pdblOut : DOUBLE* out -> Ptr CDouble
-- 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 varr8fromui8 =
  foreign "VarR8FromUI8"
    (uint64_t @-> (ptr double) @-> returning int32_t)
(* ui64In : ULONGLONG -> uint64_t *)
(* pdblOut : DOUBLE* out -> (ptr double) *)
(* 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 ("VarR8FromUI8" var-r8-from-ui8 :convention :stdcall) :int32
  (ui64-in :uint64)   ; ULONGLONG
  (pdbl-out :pointer))   ; DOUBLE* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $VarR8FromUI8 = Win32::API::More->new('OLEAUT32',
    'int VarR8FromUI8(UINT64 ui64In, LPVOID pdblOut)');
# my $ret = $VarR8FromUI8->Call($ui64In, $pdblOut);
# ui64In : ULONGLONG -> UINT64
# pdblOut : DOUBLE* out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。