VarR8FromDate

関数

DATE型の日付値をDOUBLE（倍精度浮動小数点数）に変換する。

DLLOLEAUT32.dll呼出規約winapi

シグネチャ

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

HRESULT VarR8FromDate(
    DOUBLE dateIn,
    DOUBLE* pdblOut
);

パラメーター

名前	型	方向
dateIn	DOUBLE	in
pdblOut	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 VarR8FromDate(
    DOUBLE dateIn,
    DOUBLE* pdblOut
);

[DllImport("OLEAUT32.dll", ExactSpelling = true)]
static extern int VarR8FromDate(
    double dateIn,   // DOUBLE
    out double pdblOut   // DOUBLE* out
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarR8FromDate(
    dateIn As Double,   ' DOUBLE
    <Out> ByRef pdblOut As Double   ' DOUBLE* out
) As Integer
End Function

' dateIn : DOUBLE
' pdblOut : DOUBLE* out
Declare PtrSafe Function VarR8FromDate Lib "oleaut32" ( _
    ByVal dateIn As Double, _
    ByRef pdblOut 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

VarR8FromDate = ctypes.windll.oleaut32.VarR8FromDate
VarR8FromDate.restype = ctypes.c_int
VarR8FromDate.argtypes = [
    ctypes.c_double,  # dateIn : DOUBLE
    ctypes.POINTER(ctypes.c_double),  # pdblOut : DOUBLE* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarR8FromDate = Fiddle::Function.new(
  lib['VarR8FromDate'],
  [
    Fiddle::TYPE_DOUBLE,  # dateIn : DOUBLE
    Fiddle::TYPE_VOIDP,  # pdblOut : DOUBLE* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarR8FromDate(
        dateIn: f64,  // DOUBLE
        pdblOut: *mut f64  // DOUBLE* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarR8FromDate(double dateIn, out double pdblOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarR8FromDate' -Namespace Win32 -PassThru
# $api::VarR8FromDate(dateIn, pdblOut)

#uselib "OLEAUT32.dll"
#func global VarR8FromDate "VarR8FromDate" double, sptr
; VarR8FromDate dateIn, varptr(pdblOut)   ; 戻り値は stat
; dateIn : DOUBLE -> "double"
; pdblOut : 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 VarR8FromDate "VarR8FromDate" double, var
; res = VarR8FromDate(dateIn, pdblOut)
; dateIn : DOUBLE -> "double"
; pdblOut : 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 VarR8FromDate "VarR8FromDate" double, sptr
; res = VarR8FromDate(dateIn, varptr(pdblOut))
; dateIn : DOUBLE -> "double"
; pdblOut : 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 VarR8FromDate(DOUBLE dateIn, DOUBLE* pdblOut)
#uselib "OLEAUT32.dll"
#cfunc global VarR8FromDate "VarR8FromDate" double, var
; res = VarR8FromDate(dateIn, pdblOut)
; dateIn : DOUBLE -> "double"
; pdblOut : 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 VarR8FromDate(DOUBLE dateIn, DOUBLE* pdblOut)
#uselib "OLEAUT32.dll"
#cfunc global VarR8FromDate "VarR8FromDate" double, intptr
; res = VarR8FromDate(dateIn, varptr(pdblOut))
; dateIn : DOUBLE -> "double"
; pdblOut : 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 (
	"math"
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procVarR8FromDate = oleaut32.NewProc("VarR8FromDate")
)

// dateIn (DOUBLE), pdblOut (DOUBLE* out)
r1, _, err := procVarR8FromDate.Call(
	uintptr(math.Float64bits(dateIn)),
	uintptr(pdblOut),
)
_ = 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 VarR8FromDate(
  dateIn: Double;   // DOUBLE
  pdblOut: Pointer   // DOUBLE* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarR8FromDate';

result := DllCall("OLEAUT32\VarR8FromDate"
    , "Double", dateIn   ; DOUBLE
    , "Ptr", pdblOut   ; DOUBLE* out
    , "Int")   ; return: HRESULT

●VarR8FromDate(dateIn, pdblOut) = DLL("OLEAUT32.dll", "int VarR8FromDate(double, void*)")
# 呼び出し: VarR8FromDate(dateIn, pdblOut)
# dateIn : DOUBLE -> "double"
# pdblOut : 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)。