OpenPrivateNamespaceW

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

HANDLE OpenPrivateNamespaceW(
    void* lpBoundaryDescriptor,
    LPCWSTR lpAliasPrefix
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function OpenPrivateNamespaceW(
    lpBoundaryDescriptor As IntPtr,   ' void*
    <MarshalAs(UnmanagedType.LPWStr)> lpAliasPrefix As String   ' LPCWSTR
) As IntPtr
End Function

' lpBoundaryDescriptor : void*
' lpAliasPrefix : LPCWSTR
Declare PtrSafe Function OpenPrivateNamespaceW Lib "kernel32" ( _
    ByVal lpBoundaryDescriptor As LongPtr, _
    ByVal lpAliasPrefix As LongPtr) As LongPtr
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

OpenPrivateNamespaceW = ctypes.windll.kernel32.OpenPrivateNamespaceW
OpenPrivateNamespaceW.restype = ctypes.c_void_p
OpenPrivateNamespaceW.argtypes = [
    ctypes.POINTER(None),  # lpBoundaryDescriptor : void*
    wintypes.LPCWSTR,  # lpAliasPrefix : LPCWSTR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
OpenPrivateNamespaceW = Fiddle::Function.new(
  lib['OpenPrivateNamespaceW'],
  [
    Fiddle::TYPE_VOIDP,  # lpBoundaryDescriptor : void*
    Fiddle::TYPE_VOIDP,  # lpAliasPrefix : LPCWSTR
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn OpenPrivateNamespaceW(
        lpBoundaryDescriptor: *mut (),  // void*
        lpAliasPrefix: *const u16  // LPCWSTR
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode)]
public static extern IntPtr OpenPrivateNamespaceW(IntPtr lpBoundaryDescriptor, [MarshalAs(UnmanagedType.LPWStr)] string lpAliasPrefix);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_OpenPrivateNamespaceW' -Namespace Win32 -PassThru
# $api::OpenPrivateNamespaceW(lpBoundaryDescriptor, lpAliasPrefix)

#uselib "KERNEL32.dll"
#func global OpenPrivateNamespaceW "OpenPrivateNamespaceW" wptr, wptr
; OpenPrivateNamespaceW lpBoundaryDescriptor, lpAliasPrefix   ; 戻り値は stat
; lpBoundaryDescriptor : void* -> "wptr"
; lpAliasPrefix : LPCWSTR -> "wptr"
; ※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 "KERNEL32.dll"
#cfunc global OpenPrivateNamespaceW "OpenPrivateNamespaceW" sptr, wstr
; res = OpenPrivateNamespaceW(lpBoundaryDescriptor, lpAliasPrefix)
; lpBoundaryDescriptor : void* -> "sptr"
; lpAliasPrefix : LPCWSTR -> "wstr"

; HANDLE OpenPrivateNamespaceW(void* lpBoundaryDescriptor, LPCWSTR lpAliasPrefix)
#uselib "KERNEL32.dll"
#cfunc global OpenPrivateNamespaceW "OpenPrivateNamespaceW" intptr, wstr
; res = OpenPrivateNamespaceW(lpBoundaryDescriptor, lpAliasPrefix)
; lpBoundaryDescriptor : void* -> "intptr"
; lpAliasPrefix : LPCWSTR -> "wstr"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procOpenPrivateNamespaceW = kernel32.NewProc("OpenPrivateNamespaceW")
)

// lpBoundaryDescriptor (void*), lpAliasPrefix (LPCWSTR)
r1, _, err := procOpenPrivateNamespaceW.Call(
	uintptr(lpBoundaryDescriptor),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpAliasPrefix))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HANDLE

function OpenPrivateNamespaceW(
  lpBoundaryDescriptor: Pointer;   // void*
  lpAliasPrefix: PWideChar   // LPCWSTR
): THandle; stdcall;
  external 'KERNEL32.dll' name 'OpenPrivateNamespaceW';

result := DllCall("KERNEL32\OpenPrivateNamespaceW"
    , "Ptr", lpBoundaryDescriptor   ; void*
    , "WStr", lpAliasPrefix   ; LPCWSTR
    , "Ptr")   ; return: HANDLE

●OpenPrivateNamespaceW(lpBoundaryDescriptor, lpAliasPrefix) = DLL("KERNEL32.dll", "void* OpenPrivateNamespaceW(void*, char*)")
# 呼び出し: OpenPrivateNamespaceW(lpBoundaryDescriptor, lpAliasPrefix)
# lpBoundaryDescriptor : void* -> "void*"
# lpAliasPrefix : LPCWSTR -> "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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。