OpenClusterEx

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

HCLUSTER OpenClusterEx(
    LPCWSTR lpszClusterName,   // optional
    DWORD DesiredAccess,
    DWORD* GrantedAccess   // optional
);

<DllImport("CLUSAPI.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function OpenClusterEx(
    <MarshalAs(UnmanagedType.LPWStr)> lpszClusterName As String,   ' LPCWSTR optional
    DesiredAccess As UInteger,   ' DWORD
    GrantedAccess As IntPtr   ' DWORD* optional, out
) As IntPtr
End Function

' lpszClusterName : LPCWSTR optional
' DesiredAccess : DWORD
' GrantedAccess : DWORD* optional, out
Declare PtrSafe Function OpenClusterEx Lib "clusapi" ( _
    ByVal lpszClusterName As LongPtr, _
    ByVal DesiredAccess As Long, _
    ByVal GrantedAccess As LongPtr) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

OpenClusterEx = ctypes.windll.clusapi.OpenClusterEx
OpenClusterEx.restype = ctypes.c_ssize_t
OpenClusterEx.argtypes = [
    wintypes.LPCWSTR,  # lpszClusterName : LPCWSTR optional
    wintypes.DWORD,  # DesiredAccess : DWORD
    ctypes.POINTER(wintypes.DWORD),  # GrantedAccess : DWORD* optional, out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('CLUSAPI.dll')
OpenClusterEx = Fiddle::Function.new(
  lib['OpenClusterEx'],
  [
    Fiddle::TYPE_VOIDP,  # lpszClusterName : LPCWSTR optional
    -Fiddle::TYPE_INT,  # DesiredAccess : DWORD
    Fiddle::TYPE_VOIDP,  # GrantedAccess : DWORD* optional, out
  ],
  Fiddle::TYPE_INTPTR_T)

#[link(name = "clusapi")]
extern "system" {
    fn OpenClusterEx(
        lpszClusterName: *const u16,  // LPCWSTR optional
        DesiredAccess: u32,  // DWORD
        GrantedAccess: *mut u32  // DWORD* optional, out
    ) -> isize;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("CLUSAPI.dll", SetLastError = true)]
public static extern IntPtr OpenClusterEx([MarshalAs(UnmanagedType.LPWStr)] string lpszClusterName, uint DesiredAccess, IntPtr GrantedAccess);
"@
$api = Add-Type -MemberDefinition $sig -Name 'CLUSAPI_OpenClusterEx' -Namespace Win32 -PassThru
# $api::OpenClusterEx(lpszClusterName, DesiredAccess, GrantedAccess)

#uselib "CLUSAPI.dll"
#func global OpenClusterEx "OpenClusterEx" sptr, sptr, sptr
; OpenClusterEx lpszClusterName, DesiredAccess, varptr(GrantedAccess)   ; 戻り値は stat
; lpszClusterName : LPCWSTR optional -> "sptr"
; DesiredAccess : DWORD -> "sptr"
; GrantedAccess : DWORD* optional, 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 "CLUSAPI.dll"
#cfunc global OpenClusterEx "OpenClusterEx" wstr, int, var
; res = OpenClusterEx(lpszClusterName, DesiredAccess, GrantedAccess)
; lpszClusterName : LPCWSTR optional -> "wstr"
; DesiredAccess : DWORD -> "int"
; GrantedAccess : DWORD* optional, 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。

; HCLUSTER OpenClusterEx(LPCWSTR lpszClusterName, DWORD DesiredAccess, DWORD* GrantedAccess)
#uselib "CLUSAPI.dll"
#cfunc global OpenClusterEx "OpenClusterEx" wstr, int, var
; res = OpenClusterEx(lpszClusterName, DesiredAccess, GrantedAccess)
; lpszClusterName : LPCWSTR optional -> "wstr"
; DesiredAccess : DWORD -> "int"
; GrantedAccess : DWORD* optional, 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 (
	clusapi = windows.NewLazySystemDLL("CLUSAPI.dll")
	procOpenClusterEx = clusapi.NewProc("OpenClusterEx")
)

// lpszClusterName (LPCWSTR optional), DesiredAccess (DWORD), GrantedAccess (DWORD* optional, out)
r1, _, err := procOpenClusterEx.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszClusterName))),
	uintptr(DesiredAccess),
	uintptr(GrantedAccess),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HCLUSTER

function OpenClusterEx(
  lpszClusterName: PWideChar;   // LPCWSTR optional
  DesiredAccess: DWORD;   // DWORD
  GrantedAccess: Pointer   // DWORD* optional, out
): NativeInt; stdcall;
  external 'CLUSAPI.dll' name 'OpenClusterEx';

result := DllCall("CLUSAPI\OpenClusterEx"
    , "WStr", lpszClusterName   ; LPCWSTR optional
    , "UInt", DesiredAccess   ; DWORD
    , "Ptr", GrantedAccess   ; DWORD* optional, out
    , "Ptr")   ; return: HCLUSTER

●OpenClusterEx(lpszClusterName, DesiredAccess, GrantedAccess) = DLL("CLUSAPI.dll", "int OpenClusterEx(char*, dword, void*)")
# 呼び出し: OpenClusterEx(lpszClusterName, DesiredAccess, GrantedAccess)
# lpszClusterName : LPCWSTR optional -> "char*"
# DesiredAccess : DWORD -> "dword"
# GrantedAccess : DWORD* optional, 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)。