OleLoad

// OLE32.dll
#include <windows.h>

HRESULT OleLoad(
    IStorage* pStg,
    const GUID* riid,
    IOleClientSite* pClientSite,
    void** ppvObj
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function OleLoad(
    pStg As IntPtr,   ' IStorage*
    ByRef riid As Guid,   ' GUID*
    pClientSite As IntPtr,   ' IOleClientSite*
    ppvObj As IntPtr   ' void** out
) As Integer
End Function

' pStg : IStorage*
' riid : GUID*
' pClientSite : IOleClientSite*
' ppvObj : void** out
Declare PtrSafe Function OleLoad Lib "ole32" ( _
    ByVal pStg As LongPtr, _
    ByVal riid As LongPtr, _
    ByVal pClientSite As LongPtr, _
    ByVal ppvObj 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

OleLoad = ctypes.windll.ole32.OleLoad
OleLoad.restype = ctypes.c_int
OleLoad.argtypes = [
    ctypes.c_void_p,  # pStg : IStorage*
    ctypes.c_void_p,  # riid : GUID*
    ctypes.c_void_p,  # pClientSite : IOleClientSite*
    ctypes.c_void_p,  # ppvObj : void** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
OleLoad = Fiddle::Function.new(
  lib['OleLoad'],
  [
    Fiddle::TYPE_VOIDP,  # pStg : IStorage*
    Fiddle::TYPE_VOIDP,  # riid : GUID*
    Fiddle::TYPE_VOIDP,  # pClientSite : IOleClientSite*
    Fiddle::TYPE_VOIDP,  # ppvObj : void** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn OleLoad(
        pStg: *mut core::ffi::c_void,  // IStorage*
        riid: *const GUID,  // GUID*
        pClientSite: *mut core::ffi::c_void,  // IOleClientSite*
        ppvObj: *mut *mut ()  // void** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern int OleLoad(IntPtr pStg, ref Guid riid, IntPtr pClientSite, IntPtr ppvObj);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_OleLoad' -Namespace Win32 -PassThru
# $api::OleLoad(pStg, riid, pClientSite, ppvObj)

#uselib "OLE32.dll"
#func global OleLoad "OleLoad" sptr, sptr, sptr, sptr
; OleLoad pStg, varptr(riid), pClientSite, ppvObj   ; 戻り値は stat
; pStg : IStorage* -> "sptr"
; riid : GUID* -> "sptr"
; pClientSite : IOleClientSite* -> "sptr"
; ppvObj : void** 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 "OLE32.dll"
#cfunc global OleLoad "OleLoad" sptr, var, sptr, sptr
; res = OleLoad(pStg, riid, pClientSite, ppvObj)
; pStg : IStorage* -> "sptr"
; riid : GUID* -> "var"
; pClientSite : IOleClientSite* -> "sptr"
; ppvObj : void** 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 OleLoad(IStorage* pStg, GUID* riid, IOleClientSite* pClientSite, void** ppvObj)
#uselib "OLE32.dll"
#cfunc global OleLoad "OleLoad" intptr, var, intptr, intptr
; res = OleLoad(pStg, riid, pClientSite, ppvObj)
; pStg : IStorage* -> "intptr"
; riid : GUID* -> "var"
; pClientSite : IOleClientSite* -> "intptr"
; ppvObj : void** 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 (
	ole32 = windows.NewLazySystemDLL("OLE32.dll")
	procOleLoad = ole32.NewProc("OleLoad")
)

// pStg (IStorage*), riid (GUID*), pClientSite (IOleClientSite*), ppvObj (void** out)
r1, _, err := procOleLoad.Call(
	uintptr(pStg),
	uintptr(riid),
	uintptr(pClientSite),
	uintptr(ppvObj),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function OleLoad(
  pStg: Pointer;   // IStorage*
  riid: PGUID;   // GUID*
  pClientSite: Pointer;   // IOleClientSite*
  ppvObj: Pointer   // void** out
): Integer; stdcall;
  external 'OLE32.dll' name 'OleLoad';

result := DllCall("OLE32\OleLoad"
    , "Ptr", pStg   ; IStorage*
    , "Ptr", riid   ; GUID*
    , "Ptr", pClientSite   ; IOleClientSite*
    , "Ptr", ppvObj   ; void** out
    , "Int")   ; return: HRESULT

●OleLoad(pStg, riid, pClientSite, ppvObj) = DLL("OLE32.dll", "int OleLoad(void*, void*, void*, void*)")
# 呼び出し: OleLoad(pStg, riid, pClientSite, ppvObj)
# pStg : IStorage* -> "void*"
# riid : GUID* -> "void*"
# pClientSite : IOleClientSite* -> "void*"
# ppvObj : void** 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)。