CoInternetCombineUrlEx

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

HRESULT CoInternetCombineUrlEx(
    IUri* pBaseUri,   // optional
    LPCWSTR pwzRelativeUrl,   // optional
    DWORD dwCombineFlags,
    IUri** ppCombinedUri,
    UINT_PTR dwReserved   // optional
);

<DllImport("urlmon.dll", ExactSpelling:=True)>
Public Shared Function CoInternetCombineUrlEx(
    pBaseUri As IntPtr,   ' IUri* optional
    <MarshalAs(UnmanagedType.LPWStr)> pwzRelativeUrl As String,   ' LPCWSTR optional
    dwCombineFlags As UInteger,   ' DWORD
    ppCombinedUri As IntPtr,   ' IUri** out
    dwReserved As UIntPtr   ' UINT_PTR optional
) As Integer
End Function

' pBaseUri : IUri* optional
' pwzRelativeUrl : LPCWSTR optional
' dwCombineFlags : DWORD
' ppCombinedUri : IUri** out
' dwReserved : UINT_PTR optional
Declare PtrSafe Function CoInternetCombineUrlEx Lib "urlmon" ( _
    ByVal pBaseUri As LongPtr, _
    ByVal pwzRelativeUrl As LongPtr, _
    ByVal dwCombineFlags As Long, _
    ByVal ppCombinedUri As LongPtr, _
    ByVal dwReserved 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

CoInternetCombineUrlEx = ctypes.windll.urlmon.CoInternetCombineUrlEx
CoInternetCombineUrlEx.restype = ctypes.c_int
CoInternetCombineUrlEx.argtypes = [
    ctypes.c_void_p,  # pBaseUri : IUri* optional
    wintypes.LPCWSTR,  # pwzRelativeUrl : LPCWSTR optional
    wintypes.DWORD,  # dwCombineFlags : DWORD
    ctypes.c_void_p,  # ppCombinedUri : IUri** out
    ctypes.c_size_t,  # dwReserved : UINT_PTR optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('urlmon.dll')
CoInternetCombineUrlEx = Fiddle::Function.new(
  lib['CoInternetCombineUrlEx'],
  [
    Fiddle::TYPE_VOIDP,  # pBaseUri : IUri* optional
    Fiddle::TYPE_VOIDP,  # pwzRelativeUrl : LPCWSTR optional
    -Fiddle::TYPE_INT,  # dwCombineFlags : DWORD
    Fiddle::TYPE_VOIDP,  # ppCombinedUri : IUri** out
    Fiddle::TYPE_UINTPTR_T,  # dwReserved : UINT_PTR optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "urlmon")]
extern "system" {
    fn CoInternetCombineUrlEx(
        pBaseUri: *mut core::ffi::c_void,  // IUri* optional
        pwzRelativeUrl: *const u16,  // LPCWSTR optional
        dwCombineFlags: u32,  // DWORD
        ppCombinedUri: *mut *mut core::ffi::c_void,  // IUri** out
        dwReserved: usize  // UINT_PTR optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("urlmon.dll")]
public static extern int CoInternetCombineUrlEx(IntPtr pBaseUri, [MarshalAs(UnmanagedType.LPWStr)] string pwzRelativeUrl, uint dwCombineFlags, IntPtr ppCombinedUri, UIntPtr dwReserved);
"@
$api = Add-Type -MemberDefinition $sig -Name 'urlmon_CoInternetCombineUrlEx' -Namespace Win32 -PassThru
# $api::CoInternetCombineUrlEx(pBaseUri, pwzRelativeUrl, dwCombineFlags, ppCombinedUri, dwReserved)

#uselib "urlmon.dll"
#func global CoInternetCombineUrlEx "CoInternetCombineUrlEx" sptr, sptr, sptr, sptr, sptr
; CoInternetCombineUrlEx pBaseUri, pwzRelativeUrl, dwCombineFlags, ppCombinedUri, dwReserved   ; 戻り値は stat
; pBaseUri : IUri* optional -> "sptr"
; pwzRelativeUrl : LPCWSTR optional -> "sptr"
; dwCombineFlags : DWORD -> "sptr"
; ppCombinedUri : IUri** out -> "sptr"
; dwReserved : UINT_PTR 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 "urlmon.dll"
#cfunc global CoInternetCombineUrlEx "CoInternetCombineUrlEx" sptr, wstr, int, sptr, sptr
; res = CoInternetCombineUrlEx(pBaseUri, pwzRelativeUrl, dwCombineFlags, ppCombinedUri, dwReserved)
; pBaseUri : IUri* optional -> "sptr"
; pwzRelativeUrl : LPCWSTR optional -> "wstr"
; dwCombineFlags : DWORD -> "int"
; ppCombinedUri : IUri** out -> "sptr"
; dwReserved : UINT_PTR optional -> "sptr"

; HRESULT CoInternetCombineUrlEx(IUri* pBaseUri, LPCWSTR pwzRelativeUrl, DWORD dwCombineFlags, IUri** ppCombinedUri, UINT_PTR dwReserved)
#uselib "urlmon.dll"
#cfunc global CoInternetCombineUrlEx "CoInternetCombineUrlEx" intptr, wstr, int, intptr, intptr
; res = CoInternetCombineUrlEx(pBaseUri, pwzRelativeUrl, dwCombineFlags, ppCombinedUri, dwReserved)
; pBaseUri : IUri* optional -> "intptr"
; pwzRelativeUrl : LPCWSTR optional -> "wstr"
; dwCombineFlags : DWORD -> "int"
; ppCombinedUri : IUri** out -> "intptr"
; dwReserved : UINT_PTR optional -> "intptr"

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

var (
	urlmon = windows.NewLazySystemDLL("urlmon.dll")
	procCoInternetCombineUrlEx = urlmon.NewProc("CoInternetCombineUrlEx")
)

// pBaseUri (IUri* optional), pwzRelativeUrl (LPCWSTR optional), dwCombineFlags (DWORD), ppCombinedUri (IUri** out), dwReserved (UINT_PTR optional)
r1, _, err := procCoInternetCombineUrlEx.Call(
	uintptr(pBaseUri),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pwzRelativeUrl))),
	uintptr(dwCombineFlags),
	uintptr(ppCombinedUri),
	uintptr(dwReserved),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function CoInternetCombineUrlEx(
  pBaseUri: Pointer;   // IUri* optional
  pwzRelativeUrl: PWideChar;   // LPCWSTR optional
  dwCombineFlags: DWORD;   // DWORD
  ppCombinedUri: Pointer;   // IUri** out
  dwReserved: NativeUInt   // UINT_PTR optional
): Integer; stdcall;
  external 'urlmon.dll' name 'CoInternetCombineUrlEx';

result := DllCall("urlmon\CoInternetCombineUrlEx"
    , "Ptr", pBaseUri   ; IUri* optional
    , "WStr", pwzRelativeUrl   ; LPCWSTR optional
    , "UInt", dwCombineFlags   ; DWORD
    , "Ptr", ppCombinedUri   ; IUri** out
    , "UPtr", dwReserved   ; UINT_PTR optional
    , "Int")   ; return: HRESULT

●CoInternetCombineUrlEx(pBaseUri, pwzRelativeUrl, dwCombineFlags, ppCombinedUri, dwReserved) = DLL("urlmon.dll", "int CoInternetCombineUrlEx(void*, char*, dword, void*, int)")
# 呼び出し: CoInternetCombineUrlEx(pBaseUri, pwzRelativeUrl, dwCombineFlags, ppCombinedUri, dwReserved)
# pBaseUri : IUri* optional -> "void*"
# pwzRelativeUrl : LPCWSTR optional -> "char*"
# dwCombineFlags : DWORD -> "dword"
# ppCombinedUri : IUri** out -> "void*"
# dwReserved : UINT_PTR optional -> "int"
# 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)。