VarDecFromDisp

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

HRESULT VarDecFromDisp(
    IDispatch* pdispIn,
    DWORD lcid,
    DECIMAL* pdecOut
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function VarDecFromDisp(
    pdispIn As IntPtr,   ' IDispatch*
    lcid As UInteger,   ' DWORD
    pdecOut As IntPtr   ' DECIMAL* out
) As Integer
End Function

' pdispIn : IDispatch*
' lcid : DWORD
' pdecOut : DECIMAL* out
Declare PtrSafe Function VarDecFromDisp Lib "oleaut32" ( _
    ByVal pdispIn As LongPtr, _
    ByVal lcid As Long, _
    ByVal pdecOut As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

VarDecFromDisp = ctypes.windll.oleaut32.VarDecFromDisp
VarDecFromDisp.restype = ctypes.c_int
VarDecFromDisp.argtypes = [
    ctypes.c_void_p,  # pdispIn : IDispatch*
    wintypes.DWORD,  # lcid : DWORD
    ctypes.c_void_p,  # pdecOut : DECIMAL* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
VarDecFromDisp = Fiddle::Function.new(
  lib['VarDecFromDisp'],
  [
    Fiddle::TYPE_VOIDP,  # pdispIn : IDispatch*
    -Fiddle::TYPE_INT,  # lcid : DWORD
    Fiddle::TYPE_VOIDP,  # pdecOut : DECIMAL* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn VarDecFromDisp(
        pdispIn: *mut core::ffi::c_void,  // IDispatch*
        lcid: u32,  // DWORD
        pdecOut: *mut DECIMAL  // DECIMAL* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int VarDecFromDisp(IntPtr pdispIn, uint lcid, IntPtr pdecOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_VarDecFromDisp' -Namespace Win32 -PassThru
# $api::VarDecFromDisp(pdispIn, lcid, pdecOut)

#uselib "OLEAUT32.dll"
#func global VarDecFromDisp "VarDecFromDisp" sptr, sptr, sptr
; VarDecFromDisp pdispIn, lcid, varptr(pdecOut)   ; 戻り値は stat
; pdispIn : IDispatch* -> "sptr"
; lcid : DWORD -> "sptr"
; pdecOut : DECIMAL* 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 "OLEAUT32.dll"
#cfunc global VarDecFromDisp "VarDecFromDisp" sptr, int, var
; res = VarDecFromDisp(pdispIn, lcid, pdecOut)
; pdispIn : IDispatch* -> "sptr"
; lcid : DWORD -> "int"
; pdecOut : DECIMAL* 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 VarDecFromDisp(IDispatch* pdispIn, DWORD lcid, DECIMAL* pdecOut)
#uselib "OLEAUT32.dll"
#cfunc global VarDecFromDisp "VarDecFromDisp" intptr, int, var
; res = VarDecFromDisp(pdispIn, lcid, pdecOut)
; pdispIn : IDispatch* -> "intptr"
; lcid : DWORD -> "int"
; pdecOut : DECIMAL* 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 (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procVarDecFromDisp = oleaut32.NewProc("VarDecFromDisp")
)

// pdispIn (IDispatch*), lcid (DWORD), pdecOut (DECIMAL* out)
r1, _, err := procVarDecFromDisp.Call(
	uintptr(pdispIn),
	uintptr(lcid),
	uintptr(pdecOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function VarDecFromDisp(
  pdispIn: Pointer;   // IDispatch*
  lcid: DWORD;   // DWORD
  pdecOut: Pointer   // DECIMAL* out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'VarDecFromDisp';

result := DllCall("OLEAUT32\VarDecFromDisp"
    , "Ptr", pdispIn   ; IDispatch*
    , "UInt", lcid   ; DWORD
    , "Ptr", pdecOut   ; DECIMAL* out
    , "Int")   ; return: HRESULT

●VarDecFromDisp(pdispIn, lcid, pdecOut) = DLL("OLEAUT32.dll", "int VarDecFromDisp(void*, dword, void*)")
# 呼び出し: VarDecFromDisp(pdispIn, lcid, pdecOut)
# pdispIn : IDispatch* -> "void*"
# lcid : DWORD -> "dword"
# pdecOut : DECIMAL* 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)。