VariantToDoubleWithDefault

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

DOUBLE VariantToDoubleWithDefault(
    const VARIANT* varIn,
    DOUBLE dblDefault
);

<DllImport("PROPSYS.dll", ExactSpelling:=True)>
Public Shared Function VariantToDoubleWithDefault(
    varIn As IntPtr,   ' VARIANT*
    dblDefault As Double   ' DOUBLE
) As Double
End Function

' varIn : VARIANT*
' dblDefault : DOUBLE
Declare PtrSafe Function VariantToDoubleWithDefault Lib "propsys" ( _
    ByVal varIn As LongPtr, _
    ByVal dblDefault As Double) As Double
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

VariantToDoubleWithDefault = ctypes.windll.propsys.VariantToDoubleWithDefault
VariantToDoubleWithDefault.restype = ctypes.c_double
VariantToDoubleWithDefault.argtypes = [
    ctypes.c_void_p,  # varIn : VARIANT*
    ctypes.c_double,  # dblDefault : DOUBLE
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('PROPSYS.dll')
VariantToDoubleWithDefault = Fiddle::Function.new(
  lib['VariantToDoubleWithDefault'],
  [
    Fiddle::TYPE_VOIDP,  # varIn : VARIANT*
    Fiddle::TYPE_DOUBLE,  # dblDefault : DOUBLE
  ],
  Fiddle::TYPE_DOUBLE)

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

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

#uselib "PROPSYS.dll"
#func global VariantToDoubleWithDefault "VariantToDoubleWithDefault" sptr, double
; VariantToDoubleWithDefault varptr(varIn), dblDefault   ; 戻り値は stat
; varIn : VARIANT* -> "sptr"
; dblDefault : DOUBLE -> "double"
; ※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 VariantToDoubleWithDefault "VariantToDoubleWithDefault" var, double
; res = VariantToDoubleWithDefault(varIn, dblDefault)
; varIn : VARIANT* -> "var"
; dblDefault : DOUBLE -> "double"
; ※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。

; DOUBLE VariantToDoubleWithDefault(VARIANT* varIn, DOUBLE dblDefault)
#uselib "PROPSYS.dll"
#cfunc global VariantToDoubleWithDefault "VariantToDoubleWithDefault" var, double
; res = VariantToDoubleWithDefault(varIn, dblDefault)
; varIn : VARIANT* -> "var"
; dblDefault : DOUBLE -> "double"
; ※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 (
	"math"
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	propsys = windows.NewLazySystemDLL("PROPSYS.dll")
	procVariantToDoubleWithDefault = propsys.NewProc("VariantToDoubleWithDefault")
)

// varIn (VARIANT*), dblDefault (DOUBLE)
r1, _, err := procVariantToDoubleWithDefault.Call(
	uintptr(varIn),
	uintptr(math.Float64bits(dblDefault)),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DOUBLE
// 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 VariantToDoubleWithDefault(
  varIn: Pointer;   // VARIANT*
  dblDefault: Double   // DOUBLE
): Double; stdcall;
  external 'PROPSYS.dll' name 'VariantToDoubleWithDefault';

result := DllCall("PROPSYS\VariantToDoubleWithDefault"
    , "Ptr", varIn   ; VARIANT*
    , "Double", dblDefault   ; DOUBLE
    , "Double")   ; return: DOUBLE

●VariantToDoubleWithDefault(varIn, dblDefault) = DLL("PROPSYS.dll", "double VariantToDoubleWithDefault(void*, double)")
# 呼び出し: VariantToDoubleWithDefault(varIn, dblDefault)
# varIn : VARIANT* -> "void*"
# dblDefault : DOUBLE -> "double"
# 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)。