OleRegGetUserType

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

HRESULT OleRegGetUserType(
    const GUID* clsid,
    DWORD dwFormOfType,
    LPWSTR* pszUserType
);

<DllImport("OLE32.dll", ExactSpelling:=True)>
Public Shared Function OleRegGetUserType(
    ByRef clsid As Guid,   ' GUID*
    dwFormOfType As UInteger,   ' DWORD
    pszUserType As IntPtr   ' LPWSTR* out
) As Integer
End Function

' clsid : GUID*
' dwFormOfType : DWORD
' pszUserType : LPWSTR* out
Declare PtrSafe Function OleRegGetUserType Lib "ole32" ( _
    ByVal clsid As LongPtr, _
    ByVal dwFormOfType As Long, _
    ByVal pszUserType 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

OleRegGetUserType = ctypes.windll.ole32.OleRegGetUserType
OleRegGetUserType.restype = ctypes.c_int
OleRegGetUserType.argtypes = [
    ctypes.c_void_p,  # clsid : GUID*
    wintypes.DWORD,  # dwFormOfType : DWORD
    ctypes.c_void_p,  # pszUserType : LPWSTR* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLE32.dll')
OleRegGetUserType = Fiddle::Function.new(
  lib['OleRegGetUserType'],
  [
    Fiddle::TYPE_VOIDP,  # clsid : GUID*
    -Fiddle::TYPE_INT,  # dwFormOfType : DWORD
    Fiddle::TYPE_VOIDP,  # pszUserType : LPWSTR* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn OleRegGetUserType(
        clsid: *const GUID,  // GUID*
        dwFormOfType: u32,  // DWORD
        pszUserType: *mut *mut u16  // LPWSTR* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLE32.dll")]
public static extern int OleRegGetUserType(ref Guid clsid, uint dwFormOfType, IntPtr pszUserType);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLE32_OleRegGetUserType' -Namespace Win32 -PassThru
# $api::OleRegGetUserType(clsid, dwFormOfType, pszUserType)

#uselib "OLE32.dll"
#func global OleRegGetUserType "OleRegGetUserType" sptr, sptr, sptr
; OleRegGetUserType varptr(clsid), dwFormOfType, varptr(pszUserType)   ; 戻り値は stat
; clsid : GUID* -> "sptr"
; dwFormOfType : DWORD -> "sptr"
; pszUserType : LPWSTR* 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 OleRegGetUserType "OleRegGetUserType" var, int, var
; res = OleRegGetUserType(clsid, dwFormOfType, pszUserType)
; clsid : GUID* -> "var"
; dwFormOfType : DWORD -> "int"
; pszUserType : LPWSTR* out -> "var"
; ※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 OleRegGetUserType(GUID* clsid, DWORD dwFormOfType, LPWSTR* pszUserType)
#uselib "OLE32.dll"
#cfunc global OleRegGetUserType "OleRegGetUserType" var, int, var
; res = OleRegGetUserType(clsid, dwFormOfType, pszUserType)
; clsid : GUID* -> "var"
; dwFormOfType : DWORD -> "int"
; pszUserType : LPWSTR* out -> "var"
; ※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")
	procOleRegGetUserType = ole32.NewProc("OleRegGetUserType")
)

// clsid (GUID*), dwFormOfType (DWORD), pszUserType (LPWSTR* out)
r1, _, err := procOleRegGetUserType.Call(
	uintptr(clsid),
	uintptr(dwFormOfType),
	uintptr(pszUserType),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function OleRegGetUserType(
  clsid: PGUID;   // GUID*
  dwFormOfType: DWORD;   // DWORD
  pszUserType: PPWideChar   // LPWSTR* out
): Integer; stdcall;
  external 'OLE32.dll' name 'OleRegGetUserType';

result := DllCall("OLE32\OleRegGetUserType"
    , "Ptr", clsid   ; GUID*
    , "UInt", dwFormOfType   ; DWORD
    , "Ptr", pszUserType   ; LPWSTR* out
    , "Int")   ; return: HRESULT

●OleRegGetUserType(clsid, dwFormOfType, pszUserType) = DLL("OLE32.dll", "int OleRegGetUserType(void*, dword, void*)")
# 呼び出し: OleRegGetUserType(clsid, dwFormOfType, pszUserType)
# clsid : GUID* -> "void*"
# dwFormOfType : DWORD -> "dword"
# pszUserType : LPWSTR* 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)。