CoCreateInstance

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

HRESULT CoCreateInstance(
    const GUID* rclsid,
    IUnknown* pUnkOuter,   // optional
    CLSCTX dwClsContext,
    const GUID* riid,
    void** ppv
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function CoCreateInstance(
    ByRef rclsid As Guid,   ' GUID*
    pUnkOuter As IntPtr,   ' IUnknown* optional
    dwClsContext As UInteger,   ' CLSCTX
    ByRef riid As Guid,   ' GUID*
    ppv As IntPtr   ' void** out
) As Integer
End Function

' rclsid : GUID*
' pUnkOuter : IUnknown* optional
' dwClsContext : CLSCTX
' riid : GUID*
' ppv : void** out
Declare PtrSafe Function CoCreateInstance Lib "ole32" ( _
    ByVal rclsid As LongPtr, _
    ByVal pUnkOuter As LongPtr, _
    ByVal dwClsContext As Long, _
    ByVal riid As LongPtr, _
    ByVal ppv 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

CoCreateInstance = ctypes.windll.ole32.CoCreateInstance
CoCreateInstance.restype = ctypes.c_int
CoCreateInstance.argtypes = [
    ctypes.c_void_p,  # rclsid : GUID*
    ctypes.c_void_p,  # pUnkOuter : IUnknown* optional
    wintypes.DWORD,  # dwClsContext : CLSCTX
    ctypes.c_void_p,  # riid : GUID*
    ctypes.c_void_p,  # ppv : void** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
CoCreateInstance = Fiddle::Function.new(
  lib['CoCreateInstance'],
  [
    Fiddle::TYPE_VOIDP,  # rclsid : GUID*
    Fiddle::TYPE_VOIDP,  # pUnkOuter : IUnknown* optional
    -Fiddle::TYPE_INT,  # dwClsContext : CLSCTX
    Fiddle::TYPE_VOIDP,  # riid : GUID*
    Fiddle::TYPE_VOIDP,  # ppv : void** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn CoCreateInstance(
        rclsid: *const GUID,  // GUID*
        pUnkOuter: *mut core::ffi::c_void,  // IUnknown* optional
        dwClsContext: u32,  // CLSCTX
        riid: *const GUID,  // GUID*
        ppv: *mut *mut ()  // void** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern int CoCreateInstance(ref Guid rclsid, IntPtr pUnkOuter, uint dwClsContext, ref Guid riid, IntPtr ppv);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_CoCreateInstance' -Namespace Win32 -PassThru
# $api::CoCreateInstance(rclsid, pUnkOuter, dwClsContext, riid, ppv)

#uselib "OLE32.dll"
#func global CoCreateInstance "CoCreateInstance" sptr, sptr, sptr, sptr, sptr
; CoCreateInstance varptr(rclsid), pUnkOuter, dwClsContext, varptr(riid), ppv   ; 戻り値は stat
; rclsid : GUID* -> "sptr"
; pUnkOuter : IUnknown* optional -> "sptr"
; dwClsContext : CLSCTX -> "sptr"
; riid : GUID* -> "sptr"
; ppv : 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 CoCreateInstance "CoCreateInstance" var, sptr, int, var, sptr
; res = CoCreateInstance(rclsid, pUnkOuter, dwClsContext, riid, ppv)
; rclsid : GUID* -> "var"
; pUnkOuter : IUnknown* optional -> "sptr"
; dwClsContext : CLSCTX -> "int"
; riid : GUID* -> "var"
; ppv : 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 CoCreateInstance(GUID* rclsid, IUnknown* pUnkOuter, CLSCTX dwClsContext, GUID* riid, void** ppv)
#uselib "OLE32.dll"
#cfunc global CoCreateInstance "CoCreateInstance" var, intptr, int, var, intptr
; res = CoCreateInstance(rclsid, pUnkOuter, dwClsContext, riid, ppv)
; rclsid : GUID* -> "var"
; pUnkOuter : IUnknown* optional -> "intptr"
; dwClsContext : CLSCTX -> "int"
; riid : GUID* -> "var"
; ppv : 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")
	procCoCreateInstance = ole32.NewProc("CoCreateInstance")
)

// rclsid (GUID*), pUnkOuter (IUnknown* optional), dwClsContext (CLSCTX), riid (GUID*), ppv (void** out)
r1, _, err := procCoCreateInstance.Call(
	uintptr(rclsid),
	uintptr(pUnkOuter),
	uintptr(dwClsContext),
	uintptr(riid),
	uintptr(ppv),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function CoCreateInstance(
  rclsid: PGUID;   // GUID*
  pUnkOuter: Pointer;   // IUnknown* optional
  dwClsContext: DWORD;   // CLSCTX
  riid: PGUID;   // GUID*
  ppv: Pointer   // void** out
): Integer; stdcall;
  external 'OLE32.dll' name 'CoCreateInstance';

result := DllCall("OLE32\CoCreateInstance"
    , "Ptr", rclsid   ; GUID*
    , "Ptr", pUnkOuter   ; IUnknown* optional
    , "UInt", dwClsContext   ; CLSCTX
    , "Ptr", riid   ; GUID*
    , "Ptr", ppv   ; void** out
    , "Int")   ; return: HRESULT

●CoCreateInstance(rclsid, pUnkOuter, dwClsContext, riid, ppv) = DLL("OLE32.dll", "int CoCreateInstance(void*, void*, dword, void*, void*)")
# 呼び出し: CoCreateInstance(rclsid, pUnkOuter, dwClsContext, riid, ppv)
# rclsid : GUID* -> "void*"
# pUnkOuter : IUnknown* optional -> "void*"
# dwClsContext : CLSCTX -> "dword"
# riid : GUID* -> "void*"
# ppv : 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)。