VarI1FromDate

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

HRESULT VarI1FromDate(
    DOUBLE dateIn,
    LPSTR pcOut
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarI1FromDate(
    dateIn As Double,   ' DOUBLE
    <MarshalAs(UnmanagedType.LPStr)> pcOut As System.Text.StringBuilder   ' LPSTR out
) As Integer
End Function

' dateIn : DOUBLE
' pcOut : LPSTR out
Declare PtrSafe Function VarI1FromDate Lib "oleaut32" ( _
    ByVal dateIn As Double, _
    ByVal pcOut As String) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

VarI1FromDate = ctypes.windll.oleaut32.VarI1FromDate
VarI1FromDate.restype = ctypes.c_int
VarI1FromDate.argtypes = [
    ctypes.c_double,  # dateIn : DOUBLE
    wintypes.LPSTR,  # pcOut : LPSTR out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarI1FromDate = Fiddle::Function.new(
  lib['VarI1FromDate'],
  [
    Fiddle::TYPE_DOUBLE,  # dateIn : DOUBLE
    Fiddle::TYPE_VOIDP,  # pcOut : LPSTR out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarI1FromDate(
        dateIn: f64,  // DOUBLE
        pcOut: *mut u8  // LPSTR out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarI1FromDate(double dateIn, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder pcOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarI1FromDate' -Namespace Win32 -PassThru
# $api::VarI1FromDate(dateIn, pcOut)

#uselib "OLEAUT32.dll"
#func global VarI1FromDate "VarI1FromDate" double, sptr
; VarI1FromDate dateIn, varptr(pcOut)   ; 戻り値は stat
; dateIn : DOUBLE -> "double"
; pcOut : LPSTR 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")
	procVarI1FromDate = oleaut32.NewProc("VarI1FromDate")
)

// dateIn (DOUBLE), pcOut (LPSTR out)
r1, _, err := procVarI1FromDate.Call(
	uintptr(math.Float64bits(dateIn)),
	uintptr(pcOut),
)
_ = 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 VarI1FromDate(
  dateIn: Double;   // DOUBLE
  pcOut: PAnsiChar   // LPSTR out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarI1FromDate';

result := DllCall("OLEAUT32\VarI1FromDate"
    , "Double", dateIn   ; DOUBLE
    , "Ptr", pcOut   ; LPSTR out
    , "Int")   ; return: HRESULT

●VarI1FromDate(dateIn, pcOut) = DLL("OLEAUT32.dll", "int VarI1FromDate(double, char*)")
# 呼び出し: VarI1FromDate(dateIn, pcOut)
# dateIn : DOUBLE -> "double"
# pcOut : LPSTR out -> "char*"
# 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 VarI1FromDate(
    dateIn: f64, // DOUBLE
    pcOut: [*c]u8 // LPSTR out
) callconv(std.os.windows.WINAPI) i32;

proc VarI1FromDate(
    dateIn: float64,  # DOUBLE
    pcOut: ptr char  # LPSTR out
): int32 {.importc: "VarI1FromDate", stdcall, dynlib: "OLEAUT32.dll".}

pragma(lib, "oleaut32");
extern(Windows)
int VarI1FromDate(
    double dateIn,   // DOUBLE
    char* pcOut   // LPSTR out
);

ccall((:VarI1FromDate, "OLEAUT32.dll"), stdcall, Int32,
      (Float64, Ptr{UInt8}),
      dateIn, pcOut)
# dateIn : DOUBLE -> Float64
# pcOut : LPSTR out -> Ptr{UInt8}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t VarI1FromDate(
    double dateIn,
    char* pcOut);
]]
local oleaut32 = ffi.load("oleaut32")
-- oleaut32.VarI1FromDate(dateIn, pcOut)
-- dateIn : DOUBLE
-- pcOut : LPSTR 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 VarI1FromDate = lib.func('__stdcall', 'VarI1FromDate', 'int32_t', ['double', 'char *']);
// VarI1FromDate(dateIn, pcOut)
// dateIn : DOUBLE -> 'double'
// pcOut : LPSTR out -> 'char *'
// 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", {
  VarI1FromDate: { parameters: ["f64", "buffer"], result: "i32" },
});
// lib.symbols.VarI1FromDate(dateIn, pcOut)
// dateIn : DOUBLE -> "f64"
// pcOut : LPSTR out -> "buffer"
// 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 VarI1FromDate(
    double dateIn,
    char* pcOut);
C, "OLEAUT32.dll");
// $ffi->VarI1FromDate(dateIn, pcOut);
// dateIn : DOUBLE
// pcOut : LPSTR 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 VarI1FromDate(
        double dateIn,   // DOUBLE
        byte[] pcOut   // LPSTR out
    );
}

@[Link("oleaut32")]
lib LibOLEAUT32
  fun VarI1FromDate = VarI1FromDate(
    dateIn : Float64,   # DOUBLE
    pcOut : UInt8*   # LPSTR 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 VarI1FromDateNative = Int32 Function(Double, Pointer<Utf8>);
typedef VarI1FromDateDart = int Function(double, Pointer<Utf8>);
final VarI1FromDate = DynamicLibrary.open('OLEAUT32.dll')
    .lookupFunction<VarI1FromDateNative, VarI1FromDateDart>('VarI1FromDate');
// dateIn : DOUBLE -> Double
// pcOut : LPSTR out -> Pointer<Utf8>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function VarI1FromDate(
  dateIn: Double;   // DOUBLE
  pcOut: PAnsiChar   // LPSTR out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarI1FromDate';

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

foreign import stdcall safe "VarI1FromDate"
  c_VarI1FromDate :: CDouble -> CString -> IO Int32
-- dateIn : DOUBLE -> CDouble
-- pcOut : LPSTR out -> CString
-- 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 vari1fromdate =
  foreign "VarI1FromDate"
    (double @-> string @-> returning int32_t)
(* dateIn : DOUBLE -> double *)
(* pcOut : LPSTR out -> string *)
(* 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 ("VarI1FromDate" var-i1-from-date :convention :stdcall) :int32
  (date-in :double)   ; DOUBLE
  (pc-out :pointer))   ; LPSTR out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $VarI1FromDate = Win32::API::More->new('OLEAUT32',
    'int VarI1FromDate(double dateIn, LPSTR pcOut)');
# my $ret = $VarI1FromDate->Call($dateIn, $pcOut);
# dateIn : DOUBLE -> double
# pcOut : LPSTR out -> LPSTR
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。