SystemTimeToVariantTime

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

INT SystemTimeToVariantTime(
    SYSTEMTIME* lpSystemTime,
    DOUBLE* pvtime
);

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

' lpSystemTime : SYSTEMTIME*
' pvtime : DOUBLE* out
Declare PtrSafe Function SystemTimeToVariantTime Lib "oleaut32" ( _
    ByVal lpSystemTime As LongPtr, _
    ByRef pvtime 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

SystemTimeToVariantTime = ctypes.windll.oleaut32.SystemTimeToVariantTime
SystemTimeToVariantTime.restype = ctypes.c_int
SystemTimeToVariantTime.argtypes = [
    ctypes.c_void_p,  # lpSystemTime : SYSTEMTIME*
    ctypes.POINTER(ctypes.c_double),  # pvtime : DOUBLE* out
]

require 'fiddle'
require 'fiddle/import'

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

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

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int SystemTimeToVariantTime(IntPtr lpSystemTime, out double pvtime);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_SystemTimeToVariantTime' -Namespace Win32 -PassThru
# $api::SystemTimeToVariantTime(lpSystemTime, pvtime)

#uselib "OLEAUT32.dll"
#func global SystemTimeToVariantTime "SystemTimeToVariantTime" sptr, sptr
; SystemTimeToVariantTime varptr(lpSystemTime), varptr(pvtime)   ; 戻り値は stat
; lpSystemTime : SYSTEMTIME* -> "sptr"
; pvtime : 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。

#uselib "OLEAUT32.dll"
#cfunc global SystemTimeToVariantTime "SystemTimeToVariantTime" var, var
; res = SystemTimeToVariantTime(lpSystemTime, pvtime)
; lpSystemTime : SYSTEMTIME* -> "var"
; pvtime : DOUBLE* 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 SystemTimeToVariantTime(SYSTEMTIME* lpSystemTime, DOUBLE* pvtime)
#uselib "OLEAUT32.dll"
#cfunc global SystemTimeToVariantTime "SystemTimeToVariantTime" var, var
; res = SystemTimeToVariantTime(lpSystemTime, pvtime)
; lpSystemTime : SYSTEMTIME* -> "var"
; pvtime : DOUBLE* 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 (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procSystemTimeToVariantTime = oleaut32.NewProc("SystemTimeToVariantTime")
)

// lpSystemTime (SYSTEMTIME*), pvtime (DOUBLE* out)
r1, _, err := procSystemTimeToVariantTime.Call(
	uintptr(lpSystemTime),
	uintptr(pvtime),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function SystemTimeToVariantTime(
  lpSystemTime: Pointer;   // SYSTEMTIME*
  pvtime: Pointer   // DOUBLE* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'SystemTimeToVariantTime';

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

●SystemTimeToVariantTime(lpSystemTime, pvtime) = DLL("OLEAUT32.dll", "int SystemTimeToVariantTime(void*, void*)")
# 呼び出し: SystemTimeToVariantTime(lpSystemTime, pvtime)
# lpSystemTime : SYSTEMTIME* -> "void*"
# pvtime : 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)。