RegisterTypeLibForUser

// OLEAUT32.dll
#include <windows.h>

HRESULT RegisterTypeLibForUser(
    ITypeLib* ptlib,
    LPWSTR szFullPath,
    LPWSTR szHelpDir   // optional
);

<DllImport("OLEAUT32.dll", ExactSpelling:=True)>
Public Shared Function RegisterTypeLibForUser(
    ptlib As IntPtr,   ' ITypeLib*
    <MarshalAs(UnmanagedType.LPWStr)> szFullPath As String,   ' LPWSTR
    <MarshalAs(UnmanagedType.LPWStr)> szHelpDir As String   ' LPWSTR optional
) As Integer
End Function

' ptlib : ITypeLib*
' szFullPath : LPWSTR
' szHelpDir : LPWSTR optional
Declare PtrSafe Function RegisterTypeLibForUser Lib "oleaut32" ( _
    ByVal ptlib As LongPtr, _
    ByVal szFullPath As LongPtr, _
    ByVal szHelpDir 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

RegisterTypeLibForUser = ctypes.windll.oleaut32.RegisterTypeLibForUser
RegisterTypeLibForUser.restype = ctypes.c_int
RegisterTypeLibForUser.argtypes = [
    ctypes.c_void_p,  # ptlib : ITypeLib*
    wintypes.LPCWSTR,  # szFullPath : LPWSTR
    wintypes.LPCWSTR,  # szHelpDir : LPWSTR optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('OLEAUT32.dll')
RegisterTypeLibForUser = Fiddle::Function.new(
  lib['RegisterTypeLibForUser'],
  [
    Fiddle::TYPE_VOIDP,  # ptlib : ITypeLib*
    Fiddle::TYPE_VOIDP,  # szFullPath : LPWSTR
    Fiddle::TYPE_VOIDP,  # szHelpDir : LPWSTR optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "oleaut32")]
extern "system" {
    fn RegisterTypeLibForUser(
        ptlib: *mut core::ffi::c_void,  // ITypeLib*
        szFullPath: *mut u16,  // LPWSTR
        szHelpDir: *mut u16  // LPWSTR optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("OLEAUT32.dll")]
public static extern int RegisterTypeLibForUser(IntPtr ptlib, [MarshalAs(UnmanagedType.LPWStr)] string szFullPath, [MarshalAs(UnmanagedType.LPWStr)] string szHelpDir);
"@
$api = Add-Type -MemberDefinition $sig -Name 'OLEAUT32_RegisterTypeLibForUser' -Namespace Win32 -PassThru
# $api::RegisterTypeLibForUser(ptlib, szFullPath, szHelpDir)

#uselib "OLEAUT32.dll"
#func global RegisterTypeLibForUser "RegisterTypeLibForUser" sptr, sptr, sptr
; RegisterTypeLibForUser ptlib, szFullPath, szHelpDir   ; 戻り値は stat
; ptlib : ITypeLib* -> "sptr"
; szFullPath : LPWSTR -> "sptr"
; szHelpDir : LPWSTR optional -> "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 "OLEAUT32.dll"
#cfunc global RegisterTypeLibForUser "RegisterTypeLibForUser" sptr, wstr, wstr
; res = RegisterTypeLibForUser(ptlib, szFullPath, szHelpDir)
; ptlib : ITypeLib* -> "sptr"
; szFullPath : LPWSTR -> "wstr"
; szHelpDir : LPWSTR optional -> "wstr"

; HRESULT RegisterTypeLibForUser(ITypeLib* ptlib, LPWSTR szFullPath, LPWSTR szHelpDir)
#uselib "OLEAUT32.dll"
#cfunc global RegisterTypeLibForUser "RegisterTypeLibForUser" intptr, wstr, wstr
; res = RegisterTypeLibForUser(ptlib, szFullPath, szHelpDir)
; ptlib : ITypeLib* -> "intptr"
; szFullPath : LPWSTR -> "wstr"
; szHelpDir : LPWSTR optional -> "wstr"

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

var (
	oleaut32 = windows.NewLazySystemDLL("OLEAUT32.dll")
	procRegisterTypeLibForUser = oleaut32.NewProc("RegisterTypeLibForUser")
)

// ptlib (ITypeLib*), szFullPath (LPWSTR), szHelpDir (LPWSTR optional)
r1, _, err := procRegisterTypeLibForUser.Call(
	uintptr(ptlib),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szFullPath))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szHelpDir))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function RegisterTypeLibForUser(
  ptlib: Pointer;   // ITypeLib*
  szFullPath: PWideChar;   // LPWSTR
  szHelpDir: PWideChar   // LPWSTR optional
): Integer; stdcall;
  external 'OLEAUT32.dll' name 'RegisterTypeLibForUser';

result := DllCall("OLEAUT32\RegisterTypeLibForUser"
    , "Ptr", ptlib   ; ITypeLib*
    , "WStr", szFullPath   ; LPWSTR
    , "WStr", szHelpDir   ; LPWSTR optional
    , "Int")   ; return: HRESULT

●RegisterTypeLibForUser(ptlib, szFullPath, szHelpDir) = DLL("OLEAUT32.dll", "int RegisterTypeLibForUser(void*, char*, char*)")
# 呼び出し: RegisterTypeLibForUser(ptlib, szFullPath, szHelpDir)
# ptlib : ITypeLib* -> "void*"
# szFullPath : LPWSTR -> "char*"
# szHelpDir : LPWSTR optional -> "char*"
# 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)。