CoInitializeEx

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

HRESULT CoInitializeEx(
    void* pvReserved,   // optional
    DWORD dwCoInit
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function CoInitializeEx(
    pvReserved As IntPtr,   ' void* optional
    dwCoInit As UInteger   ' DWORD
) As Integer
End Function

' pvReserved : void* optional
' dwCoInit : DWORD
Declare PtrSafe Function CoInitializeEx Lib "ole32" ( _
    ByVal pvReserved As LongPtr, _
    ByVal dwCoInit As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CoInitializeEx = ctypes.windll.ole32.CoInitializeEx
CoInitializeEx.restype = ctypes.c_int
CoInitializeEx.argtypes = [
    ctypes.POINTER(None),  # pvReserved : void* optional
    wintypes.DWORD,  # dwCoInit : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
CoInitializeEx = Fiddle::Function.new(
  lib['CoInitializeEx'],
  [
    Fiddle::TYPE_VOIDP,  # pvReserved : void* optional
    -Fiddle::TYPE_INT,  # dwCoInit : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn CoInitializeEx(
        pvReserved: *mut (),  // void* optional
        dwCoInit: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern int CoInitializeEx(IntPtr pvReserved, uint dwCoInit);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_CoInitializeEx' -Namespace Win32 -PassThru
# $api::CoInitializeEx(pvReserved, dwCoInit)

#uselib "OLE32.dll"
#func global CoInitializeEx "CoInitializeEx" sptr, sptr
; CoInitializeEx pvReserved, dwCoInit   ; 戻り値は stat
; pvReserved : void* optional -> "sptr"
; dwCoInit : DWORD -> "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 CoInitializeEx "CoInitializeEx" sptr, int
; res = CoInitializeEx(pvReserved, dwCoInit)
; pvReserved : void* optional -> "sptr"
; dwCoInit : DWORD -> "int"

; HRESULT CoInitializeEx(void* pvReserved, DWORD dwCoInit)
#uselib "OLE32.dll"
#cfunc global CoInitializeEx "CoInitializeEx" intptr, int
; res = CoInitializeEx(pvReserved, dwCoInit)
; pvReserved : void* optional -> "intptr"
; dwCoInit : DWORD -> "int"

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

var (
	ole32 = windows.NewLazySystemDLL("OLE32.dll")
	procCoInitializeEx = ole32.NewProc("CoInitializeEx")
)

// pvReserved (void* optional), dwCoInit (DWORD)
r1, _, err := procCoInitializeEx.Call(
	uintptr(pvReserved),
	uintptr(dwCoInit),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function CoInitializeEx(
  pvReserved: Pointer;   // void* optional
  dwCoInit: DWORD   // DWORD
): Integer; stdcall;
  external 'OLE32.dll' name 'CoInitializeEx';

result := DllCall("OLE32\CoInitializeEx"
    , "Ptr", pvReserved   ; void* optional
    , "UInt", dwCoInit   ; DWORD
    , "Int")   ; return: HRESULT

●CoInitializeEx(pvReserved, dwCoInit) = DLL("OLE32.dll", "int CoInitializeEx(void*, dword)")
# 呼び出し: CoInitializeEx(pvReserved, dwCoInit)
# pvReserved : void* optional -> "void*"
# dwCoInit : DWORD -> "dword"
# 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)。