VarUI8FromDate

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

HRESULT VarUI8FromDate(
    DOUBLE dateIn,
    ULONGLONG* pi64Out
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarUI8FromDate(
    dateIn As Double,   ' DOUBLE
    <Out> ByRef pi64Out As ULong   ' ULONGLONG* out
) As Integer
End Function

' dateIn : DOUBLE
' pi64Out : ULONGLONG* out
Declare PtrSafe Function VarUI8FromDate Lib "oleaut32" ( _
    ByVal dateIn As Double, _
    ByRef pi64Out 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

VarUI8FromDate = ctypes.windll.oleaut32.VarUI8FromDate
VarUI8FromDate.restype = ctypes.c_int
VarUI8FromDate.argtypes = [
    ctypes.c_double,  # dateIn : DOUBLE
    ctypes.POINTER(ctypes.c_ulonglong),  # pi64Out : ULONGLONG* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarUI8FromDate = Fiddle::Function.new(
  lib['VarUI8FromDate'],
  [
    Fiddle::TYPE_DOUBLE,  # dateIn : DOUBLE
    Fiddle::TYPE_VOIDP,  # pi64Out : ULONGLONG* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarUI8FromDate(
        dateIn: f64,  // DOUBLE
        pi64Out: *mut u64  // ULONGLONG* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarUI8FromDate(double dateIn, out ulong pi64Out);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarUI8FromDate' -Namespace Win32 -PassThru
# $api::VarUI8FromDate(dateIn, pi64Out)

#uselib "OLEAUT32.dll"
#func global VarUI8FromDate "VarUI8FromDate" double, sptr
; VarUI8FromDate dateIn, varptr(pi64Out)   ; 戻り値は stat
; dateIn : DOUBLE -> "double"
; pi64Out : 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。

#uselib "OLEAUT32.dll"
#cfunc global VarUI8FromDate "VarUI8FromDate" double, var
; res = VarUI8FromDate(dateIn, pi64Out)
; dateIn : DOUBLE -> "double"
; pi64Out : ULONGLONG* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; HRESULT VarUI8FromDate(DOUBLE dateIn, ULONGLONG* pi64Out)
#uselib "OLEAUT32.dll"
#cfunc global VarUI8FromDate "VarUI8FromDate" double, var
; res = VarUI8FromDate(dateIn, pi64Out)
; dateIn : DOUBLE -> "double"
; pi64Out : ULONGLONG* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

import (
	"math"
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procVarUI8FromDate = oleaut32.NewProc("VarUI8FromDate")
)

// dateIn (DOUBLE), pi64Out (ULONGLONG* out)
r1, _, err := procVarUI8FromDate.Call(
	uintptr(math.Float64bits(dateIn)),
	uintptr(pi64Out),
)
_ = 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 VarUI8FromDate(
  dateIn: Double;   // DOUBLE
  pi64Out: Pointer   // ULONGLONG* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarUI8FromDate';

result := DllCall("OLEAUT32\VarUI8FromDate"
    , "Double", dateIn   ; DOUBLE
    , "Ptr", pi64Out   ; ULONGLONG* out
    , "Int")   ; return: HRESULT

●VarUI8FromDate(dateIn, pi64Out) = DLL("OLEAUT32.dll", "int VarUI8FromDate(double, void*)")
# 呼び出し: VarUI8FromDate(dateIn, pi64Out)
# dateIn : DOUBLE -> "double"
# pi64Out : 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)。