VariantTimeToSystemTime

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

INT VariantTimeToSystemTime(
    DOUBLE vtime,
    SYSTEMTIME* lpSystemTime
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VariantTimeToSystemTime(
    vtime As Double,   ' DOUBLE
    lpSystemTime As IntPtr   ' SYSTEMTIME* out
) As Integer
End Function

' vtime : DOUBLE
' lpSystemTime : SYSTEMTIME* out
Declare PtrSafe Function VariantTimeToSystemTime Lib "oleaut32" ( _
    ByVal vtime As Double, _
    ByVal lpSystemTime As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

VariantTimeToSystemTime = ctypes.windll.oleaut32.VariantTimeToSystemTime
VariantTimeToSystemTime.restype = ctypes.c_int
VariantTimeToSystemTime.argtypes = [
    ctypes.c_double,  # vtime : DOUBLE
    ctypes.c_void_p,  # lpSystemTime : SYSTEMTIME* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VariantTimeToSystemTime = Fiddle::Function.new(
  lib['VariantTimeToSystemTime'],
  [
    Fiddle::TYPE_DOUBLE,  # vtime : DOUBLE
    Fiddle::TYPE_VOIDP,  # lpSystemTime : SYSTEMTIME* out
  ],
  Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VariantTimeToSystemTime(double vtime, IntPtr lpSystemTime);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VariantTimeToSystemTime' -Namespace Win32 -PassThru
# $api::VariantTimeToSystemTime(vtime, lpSystemTime)

#uselib "OLEAUT32.dll"
#func global VariantTimeToSystemTime "VariantTimeToSystemTime" double, sptr
; VariantTimeToSystemTime vtime, varptr(lpSystemTime)   ; 戻り値は stat
; vtime : DOUBLE -> "double"
; lpSystemTime : SYSTEMTIME* 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 VariantTimeToSystemTime "VariantTimeToSystemTime" double, var
; res = VariantTimeToSystemTime(vtime, lpSystemTime)
; vtime : DOUBLE -> "double"
; lpSystemTime : SYSTEMTIME* 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。

; INT VariantTimeToSystemTime(DOUBLE vtime, SYSTEMTIME* lpSystemTime)
#uselib "OLEAUT32.dll"
#cfunc global VariantTimeToSystemTime "VariantTimeToSystemTime" double, var
; res = VariantTimeToSystemTime(vtime, lpSystemTime)
; vtime : DOUBLE -> "double"
; lpSystemTime : SYSTEMTIME* 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")
	procVariantTimeToSystemTime = oleaut32.NewProc("VariantTimeToSystemTime")
)

// vtime (DOUBLE), lpSystemTime (SYSTEMTIME* out)
r1, _, err := procVariantTimeToSystemTime.Call(
	uintptr(math.Float64bits(vtime)),
	uintptr(lpSystemTime),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT
// 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 VariantTimeToSystemTime(
  vtime: Double;   // DOUBLE
  lpSystemTime: Pointer   // SYSTEMTIME* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VariantTimeToSystemTime';

result := DllCall("OLEAUT32\VariantTimeToSystemTime"
    , "Double", vtime   ; DOUBLE
    , "Ptr", lpSystemTime   ; SYSTEMTIME* out
    , "Int")   ; return: INT

●VariantTimeToSystemTime(vtime, lpSystemTime) = DLL("OLEAUT32.dll", "int VariantTimeToSystemTime(double, void*)")
# 呼び出し: VariantTimeToSystemTime(vtime, lpSystemTime)
# vtime : DOUBLE -> "double"
# lpSystemTime : SYSTEMTIME* 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)。