VarR8Round

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

HRESULT VarR8Round(
    DOUBLE dblIn,
    INT cDecimals,
    DOUBLE* pdblResult
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarR8Round(
    dblIn As Double,   ' DOUBLE
    cDecimals As Integer,   ' INT
    <Out> ByRef pdblResult As Double   ' DOUBLE* out
) As Integer
End Function

' dblIn : DOUBLE
' cDecimals : INT
' pdblResult : DOUBLE* out
Declare PtrSafe Function VarR8Round Lib "oleaut32" ( _
    ByVal dblIn As Double, _
    ByVal cDecimals As Long, _
    ByRef pdblResult 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

VarR8Round = ctypes.windll.oleaut32.VarR8Round
VarR8Round.restype = ctypes.c_int
VarR8Round.argtypes = [
    ctypes.c_double,  # dblIn : DOUBLE
    ctypes.c_int,  # cDecimals : INT
    ctypes.POINTER(ctypes.c_double),  # pdblResult : DOUBLE* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarR8Round = Fiddle::Function.new(
  lib['VarR8Round'],
  [
    Fiddle::TYPE_DOUBLE,  # dblIn : DOUBLE
    Fiddle::TYPE_INT,  # cDecimals : INT
    Fiddle::TYPE_VOIDP,  # pdblResult : DOUBLE* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarR8Round(
        dblIn: f64,  // DOUBLE
        cDecimals: i32,  // INT
        pdblResult: *mut f64  // DOUBLE* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarR8Round(double dblIn, int cDecimals, out double pdblResult);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarR8Round' -Namespace Win32 -PassThru
# $api::VarR8Round(dblIn, cDecimals, pdblResult)

#uselib "OLEAUT32.dll"
#func global VarR8Round "VarR8Round" double, sptr, sptr
; VarR8Round dblIn, cDecimals, varptr(pdblResult)   ; 戻り値は stat
; dblIn : DOUBLE -> "double"
; cDecimals : INT -> "sptr"
; pdblResult : DOUBLE* 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 (
	"math"
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procVarR8Round = oleaut32.NewProc("VarR8Round")
)

// dblIn (DOUBLE), cDecimals (INT), pdblResult (DOUBLE* out)
r1, _, err := procVarR8Round.Call(
	uintptr(math.Float64bits(dblIn)),
	uintptr(cDecimals),
	uintptr(pdblResult),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT
// 注意: float/double 引数は proc.Call では XMM レジスタに渡せません。
// windows.SyscallN(proc.Addr(), math.Float64bits(x), ...) もしくは cgo を使用してください。

function VarR8Round(
  dblIn: Double;   // DOUBLE
  cDecimals: Integer;   // INT
  pdblResult: Pointer   // DOUBLE* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarR8Round';

result := DllCall("OLEAUT32\VarR8Round"
    , "Double", dblIn   ; DOUBLE
    , "Int", cDecimals   ; INT
    , "Ptr", pdblResult   ; DOUBLE* out
    , "Int")   ; return: HRESULT

●VarR8Round(dblIn, cDecimals, pdblResult) = DLL("OLEAUT32.dll", "int VarR8Round(double, int, void*)")
# 呼び出し: VarR8Round(dblIn, cDecimals, pdblResult)
# dblIn : DOUBLE -> "double"
# cDecimals : INT -> "int"
# pdblResult : 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 VarR8Round(
    dblIn: f64, // DOUBLE
    cDecimals: i32, // INT
    pdblResult: [*c]f64 // DOUBLE* out
) callconv(std.os.windows.WINAPI) i32;

proc VarR8Round(
    dblIn: float64,  # DOUBLE
    cDecimals: int32,  # INT
    pdblResult: ptr float64  # DOUBLE* out
): int32 {.importc: "VarR8Round", stdcall, dynlib: "OLEAUT32.dll".}

pragma(lib, "oleaut32");
extern(Windows)
int VarR8Round(
    double dblIn,   // DOUBLE
    int cDecimals,   // INT
    double* pdblResult   // DOUBLE* out
);

ccall((:VarR8Round, "OLEAUT32.dll"), stdcall, Int32,
      (Float64, Int32, Ptr{Float64}),
      dblIn, cDecimals, pdblResult)
# dblIn : DOUBLE -> Float64
# cDecimals : INT -> Int32
# pdblResult : 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 VarR8Round(
    double dblIn,
    int32_t cDecimals,
    double* pdblResult);
]]
local oleaut32 = ffi.load("oleaut32")
-- oleaut32.VarR8Round(dblIn, cDecimals, pdblResult)
-- dblIn : DOUBLE
-- cDecimals : INT
-- pdblResult : 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 VarR8Round = lib.func('__stdcall', 'VarR8Round', 'int32_t', ['double', 'int32_t', 'double *']);
// VarR8Round(dblIn, cDecimals, pdblResult)
// dblIn : DOUBLE -> 'double'
// cDecimals : INT -> 'int32_t'
// pdblResult : 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", {
  VarR8Round: { parameters: ["f64", "i32", "pointer"], result: "i32" },
});
// lib.symbols.VarR8Round(dblIn, cDecimals, pdblResult)
// dblIn : DOUBLE -> "f64"
// cDecimals : INT -> "i32"
// pdblResult : 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 VarR8Round(
    double dblIn,
    int32_t cDecimals,
    double* pdblResult);
C, "OLEAUT32.dll");
// $ffi->VarR8Round(dblIn, cDecimals, pdblResult);
// dblIn : DOUBLE
// cDecimals : INT
// pdblResult : 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 VarR8Round(
        double dblIn,   // DOUBLE
        int cDecimals,   // INT
        DoubleByReference pdblResult   // DOUBLE* out
    );
}

@[Link("oleaut32")]
lib LibOLEAUT32
  fun VarR8Round = VarR8Round(
    dblIn : Float64,   # DOUBLE
    cDecimals : Int32,   # INT
    pdblResult : 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 VarR8RoundNative = Int32 Function(Double, Int32, Pointer<Double>);
typedef VarR8RoundDart = int Function(double, int, Pointer<Double>);
final VarR8Round = DynamicLibrary.open('OLEAUT32.dll')
    .lookupFunction<VarR8RoundNative, VarR8RoundDart>('VarR8Round');
// dblIn : DOUBLE -> Double
// cDecimals : INT -> Int32
// pdblResult : DOUBLE* out -> Pointer<Double>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function VarR8Round(
  dblIn: Double;   // DOUBLE
  cDecimals: Integer;   // INT
  pdblResult: Pointer   // DOUBLE* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarR8Round';

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

foreign import stdcall safe "VarR8Round"
  c_VarR8Round :: CDouble -> Int32 -> Ptr CDouble -> IO Int32
-- dblIn : DOUBLE -> CDouble
-- cDecimals : INT -> Int32
-- pdblResult : 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 varr8round =
  foreign "VarR8Round"
    (double @-> int32_t @-> (ptr double) @-> returning int32_t)
(* dblIn : DOUBLE -> double *)
(* cDecimals : INT -> int32_t *)
(* pdblResult : 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 ("VarR8Round" var-r8-round :convention :stdcall) :int32
  (dbl-in :double)   ; DOUBLE
  (c-decimals :int32)   ; INT
  (pdbl-result :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 $VarR8Round = Win32::API::More->new('OLEAUT32',
    'int VarR8Round(double dblIn, int cDecimals, LPVOID pdblResult)');
# my $ret = $VarR8Round->Call($dblIn, $cDecimals, $pdblResult);
# dblIn : DOUBLE -> double
# cDecimals : INT -> int
# pdblResult : 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。