PropVariantToDouble

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

HRESULT PropVariantToDouble(
    const PROPVARIANT* propvarIn,
    DOUBLE* pdblRet
);

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

' propvarIn : PROPVARIANT*
' pdblRet : DOUBLE* out
Declare PtrSafe Function PropVariantToDouble Lib "propsys" ( _
    ByVal propvarIn 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

PropVariantToDouble = ctypes.windll.propsys.PropVariantToDouble
PropVariantToDouble.restype = ctypes.c_int
PropVariantToDouble.argtypes = [
    ctypes.c_void_p,  # propvarIn : PROPVARIANT*
    ctypes.POINTER(ctypes.c_double),  # pdblRet : DOUBLE* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('PROPSYS.dll')
PropVariantToDouble = Fiddle::Function.new(
  lib['PropVariantToDouble'],
  [
    Fiddle::TYPE_VOIDP,  # propvarIn : PROPVARIANT*
    Fiddle::TYPE_VOIDP,  # pdblRet : DOUBLE* out
  ],
  Fiddle::TYPE_INT)

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

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

#uselib "PROPSYS.dll"
#func global PropVariantToDouble "PropVariantToDouble" sptr, sptr
; PropVariantToDouble varptr(propvarIn), varptr(pdblRet)   ; 戻り値は stat
; propvarIn : PROPVARIANT* -> "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。

#uselib "PROPSYS.dll"
#cfunc global PropVariantToDouble "PropVariantToDouble" var, var
; res = PropVariantToDouble(propvarIn, pdblRet)
; propvarIn : PROPVARIANT* -> "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 PropVariantToDouble(PROPVARIANT* propvarIn, DOUBLE* pdblRet)
#uselib "PROPSYS.dll"
#cfunc global PropVariantToDouble "PropVariantToDouble" var, var
; res = PropVariantToDouble(propvarIn, pdblRet)
; propvarIn : PROPVARIANT* -> "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。

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

var (
	propsys = windows.NewLazySystemDLL("PROPSYS.dll")
	procPropVariantToDouble = propsys.NewProc("PropVariantToDouble")
)

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

function PropVariantToDouble(
  propvarIn: Pointer;   // PROPVARIANT*
  pdblRet: Pointer   // DOUBLE* out
): Integer; stdcall;
  external 'PROPSYS.dll' name 'PropVariantToDouble';

result := DllCall("PROPSYS\PropVariantToDouble"
    , "Ptr", propvarIn   ; PROPVARIANT*
    , "Ptr", pdblRet   ; DOUBLE* out
    , "Int")   ; return: HRESULT

●PropVariantToDouble(propvarIn, pdblRet) = DLL("PROPSYS.dll", "int PropVariantToDouble(void*, void*)")
# 呼び出し: PropVariantToDouble(propvarIn, pdblRet)
# propvarIn : PROPVARIANT* -> "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)。