VariantToDouble

関数

VARIANTを倍精度浮動小数点数へ変換して取得する。

DLLPROPSYS.dll呼出規約winapi対応OSWindows XP 以降

シグネチャ

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

HRESULT VariantToDouble(
    const VARIANT* varIn,
    DOUBLE* pdblRet
);

パラメーター

名前	型	方向
varIn	VARIANT*	in
pdblRet	DOUBLE*	out

戻り値の型: HRESULT

各言語での呼び出し定義

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

HRESULT VariantToDouble(
    const VARIANT* varIn,
    DOUBLE* pdblRet
);

[DllImport("PROPSYS.dll", ExactSpelling = true)]
static extern int VariantToDouble(
    IntPtr varIn,   // VARIANT*
    out double pdblRet   // DOUBLE* out
);

<DllImport("PROPSYS.dll", ExactSpelling:=True)>
Public Shared Function VariantToDouble(
    varIn As IntPtr,   ' VARIANT*
    <Out> ByRef pdblRet As Double   ' DOUBLE* out
) As Integer
End Function

' varIn : VARIANT*
' pdblRet : DOUBLE* out
Declare PtrSafe Function VariantToDouble Lib "propsys" ( _
    ByVal varIn As LongPtr, _
    ByRef pdblRet 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

VariantToDouble = ctypes.windll.propsys.VariantToDouble
VariantToDouble.restype = ctypes.c_int
VariantToDouble.argtypes = [
    ctypes.c_void_p,  # varIn : VARIANT*
    ctypes.POINTER(ctypes.c_double),  # pdblRet : DOUBLE* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('PROPSYS.dll')
VariantToDouble = Fiddle::Function.new(
  lib['VariantToDouble'],
  [
    Fiddle::TYPE_VOIDP,  # varIn : VARIANT*
    Fiddle::TYPE_VOIDP,  # pdblRet : DOUBLE* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "propsys")]
extern "system" {
    fn VariantToDouble(
        varIn: *const VARIANT,  // VARIANT*
        pdblRet: *mut f64  // DOUBLE* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("PROPSYS.dll")]
public static extern int VariantToDouble(IntPtr varIn, out double pdblRet);
"@
$api = Add-Type -MemberDefinition $sig -Name 'PROPSYS_VariantToDouble' -Namespace Win32 -PassThru
# $api::VariantToDouble(varIn, pdblRet)

#uselib "PROPSYS.dll"
#func global VariantToDouble "VariantToDouble" sptr, sptr
; VariantToDouble varptr(varIn), varptr(pdblRet)   ; 戻り値は stat
; varIn : VARIANT* -> "sptr"
; pdblRet : 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 "PROPSYS.dll"
#cfunc global VariantToDouble "VariantToDouble" var, var
; res = VariantToDouble(varIn, pdblRet)
; varIn : VARIANT* -> "var"
; pdblRet : 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 "PROPSYS.dll"
#cfunc global VariantToDouble "VariantToDouble" sptr, sptr
; res = VariantToDouble(varptr(varIn), varptr(pdblRet))
; varIn : VARIANT* -> "sptr"
; pdblRet : 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 VariantToDouble(VARIANT* varIn, DOUBLE* pdblRet)
#uselib "PROPSYS.dll"
#cfunc global VariantToDouble "VariantToDouble" var, var
; res = VariantToDouble(varIn, pdblRet)
; varIn : VARIANT* -> "var"
; pdblRet : 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 VariantToDouble(VARIANT* varIn, DOUBLE* pdblRet)
#uselib "PROPSYS.dll"
#cfunc global VariantToDouble "VariantToDouble" intptr, intptr
; res = VariantToDouble(varptr(varIn), varptr(pdblRet))
; varIn : VARIANT* -> "intptr"
; pdblRet : 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 (
	propsys = windows.NewLazySystemDLL("PROPSYS.dll")
	procVariantToDouble = propsys.NewProc("VariantToDouble")
)

// varIn (VARIANT*), pdblRet (DOUBLE* out)
r1, _, err := procVariantToDouble.Call(
	uintptr(varIn),
	uintptr(pdblRet),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VariantToDouble(
  varIn: Pointer;   // VARIANT*
  pdblRet: Pointer   // DOUBLE* out
): Integer; stdcall;
  external 'PROPSYS.dll' name 'VariantToDouble';

result := DllCall("PROPSYS\VariantToDouble"
    , "Ptr", varIn   ; VARIANT*
    , "Ptr", pdblRet   ; DOUBLE* out
    , "Int")   ; return: HRESULT

●VariantToDouble(varIn, pdblRet) = DLL("PROPSYS.dll", "int VariantToDouble(void*, void*)")
# 呼び出し: VariantToDouble(varIn, pdblRet)
# varIn : VARIANT* -> "void*"
# pdblRet : 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)。