OleRegEnumFormatEtc

// ole32.dll
#include <windows.h>

HRESULT OleRegEnumFormatEtc(
    const GUID* clsid,
    DWORD dwDirection,
    IEnumFORMATETC** ppenum
);

<DllImport("ole32.dll", ExactSpelling:=True)>
Public Shared Function OleRegEnumFormatEtc(
    ByRef clsid As Guid,   ' GUID*
    dwDirection As UInteger,   ' DWORD
    ppenum As IntPtr   ' IEnumFORMATETC** out
) As Integer
End Function

' clsid : GUID*
' dwDirection : DWORD
' ppenum : IEnumFORMATETC** out
Declare PtrSafe Function OleRegEnumFormatEtc Lib "ole32" ( _
    ByVal clsid As LongPtr, _
    ByVal dwDirection As Long, _
    ByVal ppenum 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

OleRegEnumFormatEtc = ctypes.windll.ole32.OleRegEnumFormatEtc
OleRegEnumFormatEtc.restype = ctypes.c_int
OleRegEnumFormatEtc.argtypes = [
    ctypes.c_void_p,  # clsid : GUID*
    wintypes.DWORD,  # dwDirection : DWORD
    ctypes.c_void_p,  # ppenum : IEnumFORMATETC** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ole32.dll')
OleRegEnumFormatEtc = Fiddle::Function.new(
  lib['OleRegEnumFormatEtc'],
  [
    Fiddle::TYPE_VOIDP,  # clsid : GUID*
    -Fiddle::TYPE_INT,  # dwDirection : DWORD
    Fiddle::TYPE_VOIDP,  # ppenum : IEnumFORMATETC** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn OleRegEnumFormatEtc(
        clsid: *const GUID,  // GUID*
        dwDirection: u32,  // DWORD
        ppenum: *mut *mut core::ffi::c_void  // IEnumFORMATETC** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ole32.dll")]
public static extern int OleRegEnumFormatEtc(ref Guid clsid, uint dwDirection, IntPtr ppenum);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ole32_OleRegEnumFormatEtc' -Namespace Win32 -PassThru
# $api::OleRegEnumFormatEtc(clsid, dwDirection, ppenum)

#uselib "ole32.dll"
#func global OleRegEnumFormatEtc "OleRegEnumFormatEtc" sptr, sptr, sptr
; OleRegEnumFormatEtc varptr(clsid), dwDirection, ppenum   ; 戻り値は stat
; clsid : GUID* -> "sptr"
; dwDirection : DWORD -> "sptr"
; ppenum : IEnumFORMATETC** 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 OleRegEnumFormatEtc "OleRegEnumFormatEtc" var, int, sptr
; res = OleRegEnumFormatEtc(clsid, dwDirection, ppenum)
; clsid : GUID* -> "var"
; dwDirection : DWORD -> "int"
; ppenum : IEnumFORMATETC** 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 OleRegEnumFormatEtc(GUID* clsid, DWORD dwDirection, IEnumFORMATETC** ppenum)
#uselib "ole32.dll"
#cfunc global OleRegEnumFormatEtc "OleRegEnumFormatEtc" var, int, intptr
; res = OleRegEnumFormatEtc(clsid, dwDirection, ppenum)
; clsid : GUID* -> "var"
; dwDirection : DWORD -> "int"
; ppenum : IEnumFORMATETC** 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")
	procOleRegEnumFormatEtc = ole32.NewProc("OleRegEnumFormatEtc")
)

// clsid (GUID*), dwDirection (DWORD), ppenum (IEnumFORMATETC** out)
r1, _, err := procOleRegEnumFormatEtc.Call(
	uintptr(clsid),
	uintptr(dwDirection),
	uintptr(ppenum),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function OleRegEnumFormatEtc(
  clsid: PGUID;   // GUID*
  dwDirection: DWORD;   // DWORD
  ppenum: Pointer   // IEnumFORMATETC** out
): Integer; stdcall;
  external 'ole32.dll' name 'OleRegEnumFormatEtc';

result := DllCall("ole32\OleRegEnumFormatEtc"
    , "Ptr", clsid   ; GUID*
    , "UInt", dwDirection   ; DWORD
    , "Ptr", ppenum   ; IEnumFORMATETC** out
    , "Int")   ; return: HRESULT

●OleRegEnumFormatEtc(clsid, dwDirection, ppenum) = DLL("ole32.dll", "int OleRegEnumFormatEtc(void*, dword, void*)")
# 呼び出し: OleRegEnumFormatEtc(clsid, dwDirection, ppenum)
# clsid : GUID* -> "void*"
# dwDirection : DWORD -> "dword"
# ppenum : IEnumFORMATETC** 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)。