PathAllocCombine

// api-ms-win-core-path-l1-1-0.dll
#include <windows.h>

HRESULT PathAllocCombine(
    LPCWSTR pszPathIn,   // optional
    LPCWSTR pszMore,   // optional
    PATHCCH_OPTIONS dwFlags,
    LPWSTR* ppszPathOut
);

<DllImport("api-ms-win-core-path-l1-1-0.dll", ExactSpelling:=True)>
Public Shared Function PathAllocCombine(
    <MarshalAs(UnmanagedType.LPWStr)> pszPathIn As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> pszMore As String,   ' LPCWSTR optional
    dwFlags As UInteger,   ' PATHCCH_OPTIONS
    ppszPathOut As IntPtr   ' LPWSTR* out
) As Integer
End Function

' pszPathIn : LPCWSTR optional
' pszMore : LPCWSTR optional
' dwFlags : PATHCCH_OPTIONS
' ppszPathOut : LPWSTR* out
Declare PtrSafe Function PathAllocCombine Lib "api-ms-win-core-path-l1-1-0" ( _
    ByVal pszPathIn As LongPtr, _
    ByVal pszMore As LongPtr, _
    ByVal dwFlags As Long, _
    ByVal ppszPathOut 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

PathAllocCombine = ctypes.windll.LoadLibrary("api-ms-win-core-path-l1-1-0.dll").PathAllocCombine
PathAllocCombine.restype = ctypes.c_int
PathAllocCombine.argtypes = [
    wintypes.LPCWSTR,  # pszPathIn : LPCWSTR optional
    wintypes.LPCWSTR,  # pszMore : LPCWSTR optional
    wintypes.DWORD,  # dwFlags : PATHCCH_OPTIONS
    ctypes.c_void_p,  # ppszPathOut : LPWSTR* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('api-ms-win-core-path-l1-1-0.dll')
PathAllocCombine = Fiddle::Function.new(
  lib['PathAllocCombine'],
  [
    Fiddle::TYPE_VOIDP,  # pszPathIn : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # pszMore : LPCWSTR optional
    -Fiddle::TYPE_INT,  # dwFlags : PATHCCH_OPTIONS
    Fiddle::TYPE_VOIDP,  # ppszPathOut : LPWSTR* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "api-ms-win-core-path-l1-1-0")]
extern "system" {
    fn PathAllocCombine(
        pszPathIn: *const u16,  // LPCWSTR optional
        pszMore: *const u16,  // LPCWSTR optional
        dwFlags: u32,  // PATHCCH_OPTIONS
        ppszPathOut: *mut *mut u16  // LPWSTR* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("api-ms-win-core-path-l1-1-0.dll")]
public static extern int PathAllocCombine([MarshalAs(UnmanagedType.LPWStr)] string pszPathIn, [MarshalAs(UnmanagedType.LPWStr)] string pszMore, uint dwFlags, IntPtr ppszPathOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'api-ms-win-core-path-l1-1-0_PathAllocCombine' -Namespace Win32 -PassThru
# $api::PathAllocCombine(pszPathIn, pszMore, dwFlags, ppszPathOut)

#uselib "api-ms-win-core-path-l1-1-0.dll"
#func global PathAllocCombine "PathAllocCombine" sptr, sptr, sptr, sptr
; PathAllocCombine pszPathIn, pszMore, dwFlags, varptr(ppszPathOut)   ; 戻り値は stat
; pszPathIn : LPCWSTR optional -> "sptr"
; pszMore : LPCWSTR optional -> "sptr"
; dwFlags : PATHCCH_OPTIONS -> "sptr"
; ppszPathOut : 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 "api-ms-win-core-path-l1-1-0.dll"
#cfunc global PathAllocCombine "PathAllocCombine" wstr, wstr, int, var
; res = PathAllocCombine(pszPathIn, pszMore, dwFlags, ppszPathOut)
; pszPathIn : LPCWSTR optional -> "wstr"
; pszMore : LPCWSTR optional -> "wstr"
; dwFlags : PATHCCH_OPTIONS -> "int"
; ppszPathOut : 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 PathAllocCombine(LPCWSTR pszPathIn, LPCWSTR pszMore, PATHCCH_OPTIONS dwFlags, LPWSTR* ppszPathOut)
#uselib "api-ms-win-core-path-l1-1-0.dll"
#cfunc global PathAllocCombine "PathAllocCombine" wstr, wstr, int, var
; res = PathAllocCombine(pszPathIn, pszMore, dwFlags, ppszPathOut)
; pszPathIn : LPCWSTR optional -> "wstr"
; pszMore : LPCWSTR optional -> "wstr"
; dwFlags : PATHCCH_OPTIONS -> "int"
; ppszPathOut : 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 (
	api_ms_win_core_path_l1_1_0 = windows.NewLazySystemDLL("api-ms-win-core-path-l1-1-0.dll")
	procPathAllocCombine = api_ms_win_core_path_l1_1_0.NewProc("PathAllocCombine")
)

// pszPathIn (LPCWSTR optional), pszMore (LPCWSTR optional), dwFlags (PATHCCH_OPTIONS), ppszPathOut (LPWSTR* out)
r1, _, err := procPathAllocCombine.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszPathIn))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszMore))),
	uintptr(dwFlags),
	uintptr(ppszPathOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function PathAllocCombine(
  pszPathIn: PWideChar;   // LPCWSTR optional
  pszMore: PWideChar;   // LPCWSTR optional
  dwFlags: DWORD;   // PATHCCH_OPTIONS
  ppszPathOut: PPWideChar   // LPWSTR* out
): Integer; stdcall;
  external 'api-ms-win-core-path-l1-1-0.dll' name 'PathAllocCombine';

result := DllCall("api-ms-win-core-path-l1-1-0\PathAllocCombine"
    , "WStr", pszPathIn   ; LPCWSTR optional
    , "WStr", pszMore   ; LPCWSTR optional
    , "UInt", dwFlags   ; PATHCCH_OPTIONS
    , "Ptr", ppszPathOut   ; LPWSTR* out
    , "Int")   ; return: HRESULT

●PathAllocCombine(pszPathIn, pszMore, dwFlags, ppszPathOut) = DLL("api-ms-win-core-path-l1-1-0.dll", "int PathAllocCombine(char*, char*, dword, void*)")
# 呼び出し: PathAllocCombine(pszPathIn, pszMore, dwFlags, ppszPathOut)
# pszPathIn : LPCWSTR optional -> "char*"
# pszMore : LPCWSTR optional -> "char*"
# dwFlags : PATHCCH_OPTIONS -> "dword"
# ppszPathOut : 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)。