VarDateFromDec

関数

DECIMAL値をDATE型の日付値に変換する。

DLLOLEAUT32.dll呼出規約winapi

シグネチャ

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

HRESULT VarDateFromDec(
    const DECIMAL* pdecIn,
    DOUBLE* pdateOut
);

パラメーター

名前	型	方向
pdecIn	DECIMAL*	in
pdateOut	DOUBLE*	out

戻り値の型: HRESULT

各言語での呼び出し定義

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

HRESULT VarDateFromDec(
    const DECIMAL* pdecIn,
    DOUBLE* pdateOut
);

[DllImport("OLEAUT32.dll", ExactSpelling = true)]
static extern int VarDateFromDec(
    IntPtr pdecIn,   // DECIMAL*
    out double pdateOut   // DOUBLE* out
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarDateFromDec(
    pdecIn As IntPtr,   ' DECIMAL*
    <Out> ByRef pdateOut As Double   ' DOUBLE* out
) As Integer
End Function

' pdecIn : DECIMAL*
' pdateOut : DOUBLE* out
Declare PtrSafe Function VarDateFromDec Lib "oleaut32" ( _
    ByVal pdecIn As LongPtr, _
    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

VarDateFromDec = ctypes.windll.oleaut32.VarDateFromDec
VarDateFromDec.restype = ctypes.c_int
VarDateFromDec.argtypes = [
    ctypes.c_void_p,  # pdecIn : DECIMAL*
    ctypes.POINTER(ctypes.c_double),  # pdateOut : DOUBLE* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarDateFromDec = Fiddle::Function.new(
  lib['VarDateFromDec'],
  [
    Fiddle::TYPE_VOIDP,  # pdecIn : DECIMAL*
    Fiddle::TYPE_VOIDP,  # pdateOut : DOUBLE* out
  ],
  Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarDateFromDec(IntPtr pdecIn, out double pdateOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarDateFromDec' -Namespace Win32 -PassThru
# $api::VarDateFromDec(pdecIn, pdateOut)

#uselib "OLEAUT32.dll"
#func global VarDateFromDec "VarDateFromDec" sptr, sptr
; VarDateFromDec varptr(pdecIn), varptr(pdateOut)   ; 戻り値は stat
; pdecIn : DECIMAL* -> "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。

出力引数:

#uselib "OLEAUT32.dll"
#cfunc global VarDateFromDec "VarDateFromDec" var, var
; res = VarDateFromDec(pdecIn, pdateOut)
; pdecIn : DECIMAL* -> "var"
; 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。#uselib "OLEAUT32.dll"
#cfunc global VarDateFromDec "VarDateFromDec" sptr, sptr
; res = VarDateFromDec(varptr(pdecIn), varptr(pdateOut))
; pdecIn : DECIMAL* -> "sptr"
; pdateOut : DOUBLE* out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; HRESULT VarDateFromDec(DECIMAL* pdecIn, DOUBLE* pdateOut)
#uselib "OLEAUT32.dll"
#cfunc global VarDateFromDec "VarDateFromDec" var, var
; res = VarDateFromDec(pdecIn, pdateOut)
; pdecIn : DECIMAL* -> "var"
; 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 VarDateFromDec(DECIMAL* pdecIn, DOUBLE* pdateOut)
#uselib "OLEAUT32.dll"
#cfunc global VarDateFromDec "VarDateFromDec" intptr, intptr
; res = VarDateFromDec(varptr(pdecIn), varptr(pdateOut))
; pdecIn : DECIMAL* -> "intptr"
; pdateOut : DOUBLE* out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procVarDateFromDec = oleaut32.NewProc("VarDateFromDec")
)

// pdecIn (DECIMAL*), pdateOut (DOUBLE* out)
r1, _, err := procVarDateFromDec.Call(
	uintptr(pdecIn),
	uintptr(pdateOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VarDateFromDec(
  pdecIn: Pointer;   // DECIMAL*
  pdateOut: Pointer   // DOUBLE* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarDateFromDec';

result := DllCall("OLEAUT32\VarDateFromDec"
    , "Ptr", pdecIn   ; DECIMAL*
    , "Ptr", pdateOut   ; DOUBLE* out
    , "Int")   ; return: HRESULT

●VarDateFromDec(pdecIn, pdateOut) = DLL("OLEAUT32.dll", "int VarDateFromDec(void*, void*)")
# 呼び出し: VarDateFromDec(pdecIn, pdateOut)
# pdecIn : DECIMAL* -> "void*"
# 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)。