VarDateFromUdate

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

HRESULT VarDateFromUdate(
    UDATE* pudateIn,
    DWORD dwFlags,
    DOUBLE* pdateOut
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarDateFromUdate(
    pudateIn As IntPtr,   ' UDATE*
    dwFlags As UInteger,   ' DWORD
    <Out> ByRef pdateOut As Double   ' DOUBLE* out
) As Integer
End Function

' pudateIn : UDATE*
' dwFlags : DWORD
' pdateOut : DOUBLE* out
Declare PtrSafe Function VarDateFromUdate Lib "oleaut32" ( _
    ByVal pudateIn As LongPtr, _
    ByVal dwFlags As Long, _
    ByRef pdateOut 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

VarDateFromUdate = ctypes.windll.oleaut32.VarDateFromUdate
VarDateFromUdate.restype = ctypes.c_int
VarDateFromUdate.argtypes = [
    ctypes.c_void_p,  # pudateIn : UDATE*
    wintypes.DWORD,  # dwFlags : DWORD
    ctypes.POINTER(ctypes.c_double),  # pdateOut : DOUBLE* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarDateFromUdate = Fiddle::Function.new(
  lib['VarDateFromUdate'],
  [
    Fiddle::TYPE_VOIDP,  # pudateIn : UDATE*
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # pdateOut : DOUBLE* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarDateFromUdate(
        pudateIn: *mut UDATE,  // UDATE*
        dwFlags: u32,  // DWORD
        pdateOut: *mut f64  // DOUBLE* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarDateFromUdate(IntPtr pudateIn, uint dwFlags, out double pdateOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarDateFromUdate' -Namespace Win32 -PassThru
# $api::VarDateFromUdate(pudateIn, dwFlags, pdateOut)

#uselib "OLEAUT32.dll"
#func global VarDateFromUdate "VarDateFromUdate" sptr, sptr, sptr
; VarDateFromUdate varptr(pudateIn), dwFlags, varptr(pdateOut)   ; 戻り値は stat
; pudateIn : UDATE* -> "sptr"
; dwFlags : DWORD -> "sptr"
; pdateOut : 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 VarDateFromUdate "VarDateFromUdate" var, int, var
; res = VarDateFromUdate(pudateIn, dwFlags, pdateOut)
; pudateIn : UDATE* -> "var"
; dwFlags : DWORD -> "int"
; pdateOut : 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。

; HRESULT VarDateFromUdate(UDATE* pudateIn, DWORD dwFlags, DOUBLE* pdateOut)
#uselib "OLEAUT32.dll"
#cfunc global VarDateFromUdate "VarDateFromUdate" var, int, var
; res = VarDateFromUdate(pudateIn, dwFlags, pdateOut)
; pudateIn : UDATE* -> "var"
; dwFlags : DWORD -> "int"
; pdateOut : 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")
	procVarDateFromUdate = oleaut32.NewProc("VarDateFromUdate")
)

// pudateIn (UDATE*), dwFlags (DWORD), pdateOut (DOUBLE* out)
r1, _, err := procVarDateFromUdate.Call(
	uintptr(pudateIn),
	uintptr(dwFlags),
	uintptr(pdateOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VarDateFromUdate(
  pudateIn: Pointer;   // UDATE*
  dwFlags: DWORD;   // DWORD
  pdateOut: Pointer   // DOUBLE* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarDateFromUdate';

result := DllCall("OLEAUT32\VarDateFromUdate"
    , "Ptr", pudateIn   ; UDATE*
    , "UInt", dwFlags   ; DWORD
    , "Ptr", pdateOut   ; DOUBLE* out
    , "Int")   ; return: HRESULT

●VarDateFromUdate(pudateIn, dwFlags, pdateOut) = DLL("OLEAUT32.dll", "int VarDateFromUdate(void*, dword, void*)")
# 呼び出し: VarDateFromUdate(pudateIn, dwFlags, pdateOut)
# pudateIn : UDATE* -> "void*"
# dwFlags : DWORD -> "dword"
# pdateOut : 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)。