GetActiveObject

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

HRESULT GetActiveObject(
    const GUID* rclsid,
    void* pvReserved,
    IUnknown** ppunk
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function GetActiveObject(
    ByRef rclsid As Guid,   ' GUID*
    pvReserved As IntPtr,   ' void* in/out
    ppunk As IntPtr   ' IUnknown** out
) As Integer
End Function

' rclsid : GUID*
' pvReserved : void* in/out
' ppunk : IUnknown** out
Declare PtrSafe Function GetActiveObject Lib "oleaut32" ( _
    ByVal rclsid As LongPtr, _
    ByVal pvReserved As LongPtr, _
    ByVal ppunk 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

GetActiveObject = ctypes.windll.oleaut32.GetActiveObject
GetActiveObject.restype = ctypes.c_int
GetActiveObject.argtypes = [
    ctypes.c_void_p,  # rclsid : GUID*
    ctypes.POINTER(None),  # pvReserved : void* in/out
    ctypes.c_void_p,  # ppunk : IUnknown** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
GetActiveObject = Fiddle::Function.new(
  lib['GetActiveObject'],
  [
    Fiddle::TYPE_VOIDP,  # rclsid : GUID*
    Fiddle::TYPE_VOIDP,  # pvReserved : void* in/out
    Fiddle::TYPE_VOIDP,  # ppunk : IUnknown** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn GetActiveObject(
        rclsid: *const GUID,  // GUID*
        pvReserved: *mut (),  // void* in/out
        ppunk: *mut *mut core::ffi::c_void  // IUnknown** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int GetActiveObject(ref Guid rclsid, IntPtr pvReserved, IntPtr ppunk);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_GetActiveObject' -Namespace Win32 -PassThru
# $api::GetActiveObject(rclsid, pvReserved, ppunk)

#uselib "OLEAUT32.dll"
#func global GetActiveObject "GetActiveObject" sptr, sptr, sptr
; GetActiveObject varptr(rclsid), pvReserved, ppunk   ; 戻り値は stat
; rclsid : GUID* -> "sptr"
; pvReserved : void* in/out -> "sptr"
; ppunk : IUnknown** 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 GetActiveObject "GetActiveObject" var, sptr, sptr
; res = GetActiveObject(rclsid, pvReserved, ppunk)
; rclsid : GUID* -> "var"
; pvReserved : void* in/out -> "sptr"
; ppunk : IUnknown** out -> "sptr"
; ※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 GetActiveObject(GUID* rclsid, void* pvReserved, IUnknown** ppunk)
#uselib "OLEAUT32.dll"
#cfunc global GetActiveObject "GetActiveObject" var, intptr, intptr
; res = GetActiveObject(rclsid, pvReserved, ppunk)
; rclsid : GUID* -> "var"
; pvReserved : void* in/out -> "intptr"
; ppunk : IUnknown** out -> "intptr"
; ※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")
	procGetActiveObject = oleaut32.NewProc("GetActiveObject")
)

// rclsid (GUID*), pvReserved (void* in/out), ppunk (IUnknown** out)
r1, _, err := procGetActiveObject.Call(
	uintptr(rclsid),
	uintptr(pvReserved),
	uintptr(ppunk),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function GetActiveObject(
  rclsid: PGUID;   // GUID*
  pvReserved: Pointer;   // void* in/out
  ppunk: Pointer   // IUnknown** out
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'GetActiveObject';

result := DllCall("OLEAUT32\GetActiveObject"
    , "Ptr", rclsid   ; GUID*
    , "Ptr", pvReserved   ; void* in/out
    , "Ptr", ppunk   ; IUnknown** out
    , "Int")   ; return: HRESULT

●GetActiveObject(rclsid, pvReserved, ppunk) = DLL("OLEAUT32.dll", "int GetActiveObject(void*, void*, void*)")
# 呼び出し: GetActiveObject(rclsid, pvReserved, ppunk)
# rclsid : GUID* -> "void*"
# pvReserved : void* in/out -> "void*"
# ppunk : IUnknown** 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)。