OpenClusterGroupEx

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

HGROUP OpenClusterGroupEx(
    HCLUSTER hCluster,
    LPCWSTR lpszGroupName,   // optional
    DWORD dwDesiredAccess,
    DWORD* lpdwGrantedAccess   // optional
);

<DllImport("CLUSAPI.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function OpenClusterGroupEx(
    hCluster As IntPtr,   ' HCLUSTER
    <MarshalAs(UnmanagedType.LPWStr)> lpszGroupName As String,   ' LPCWSTR optional
    dwDesiredAccess As UInteger,   ' DWORD
    lpdwGrantedAccess As IntPtr   ' DWORD* optional, out
) As IntPtr
End Function

' hCluster : HCLUSTER
' lpszGroupName : LPCWSTR optional
' dwDesiredAccess : DWORD
' lpdwGrantedAccess : DWORD* optional, out
Declare PtrSafe Function OpenClusterGroupEx Lib "clusapi" ( _
    ByVal hCluster As LongPtr, _
    ByVal lpszGroupName As LongPtr, _
    ByVal dwDesiredAccess As Long, _
    ByVal lpdwGrantedAccess 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

OpenClusterGroupEx = ctypes.windll.clusapi.OpenClusterGroupEx
OpenClusterGroupEx.restype = ctypes.c_ssize_t
OpenClusterGroupEx.argtypes = [
    ctypes.c_ssize_t,  # hCluster : HCLUSTER
    wintypes.LPCWSTR,  # lpszGroupName : LPCWSTR optional
    wintypes.DWORD,  # dwDesiredAccess : DWORD
    ctypes.POINTER(wintypes.DWORD),  # lpdwGrantedAccess : DWORD* optional, out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('CLUSAPI.dll')
OpenClusterGroupEx = Fiddle::Function.new(
  lib['OpenClusterGroupEx'],
  [
    Fiddle::TYPE_INTPTR_T,  # hCluster : HCLUSTER
    Fiddle::TYPE_VOIDP,  # lpszGroupName : LPCWSTR optional
    -Fiddle::TYPE_INT,  # dwDesiredAccess : DWORD
    Fiddle::TYPE_VOIDP,  # lpdwGrantedAccess : DWORD* optional, out
  ],
  Fiddle::TYPE_INTPTR_T)

#[link(name = "clusapi")]
extern "system" {
    fn OpenClusterGroupEx(
        hCluster: isize,  // HCLUSTER
        lpszGroupName: *const u16,  // LPCWSTR optional
        dwDesiredAccess: u32,  // DWORD
        lpdwGrantedAccess: *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 OpenClusterGroupEx(IntPtr hCluster, [MarshalAs(UnmanagedType.LPWStr)] string lpszGroupName, uint dwDesiredAccess, IntPtr lpdwGrantedAccess);
"@
$api = Add-Type -MemberDefinition $sig -Name 'CLUSAPI_OpenClusterGroupEx' -Namespace Win32 -PassThru
# $api::OpenClusterGroupEx(hCluster, lpszGroupName, dwDesiredAccess, lpdwGrantedAccess)

#uselib "CLUSAPI.dll"
#func global OpenClusterGroupEx "OpenClusterGroupEx" sptr, sptr, sptr, sptr
; OpenClusterGroupEx hCluster, lpszGroupName, dwDesiredAccess, varptr(lpdwGrantedAccess)   ; 戻り値は stat
; hCluster : HCLUSTER -> "sptr"
; lpszGroupName : LPCWSTR optional -> "sptr"
; dwDesiredAccess : DWORD -> "sptr"
; lpdwGrantedAccess : 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 OpenClusterGroupEx "OpenClusterGroupEx" sptr, wstr, int, var
; res = OpenClusterGroupEx(hCluster, lpszGroupName, dwDesiredAccess, lpdwGrantedAccess)
; hCluster : HCLUSTER -> "sptr"
; lpszGroupName : LPCWSTR optional -> "wstr"
; dwDesiredAccess : DWORD -> "int"
; lpdwGrantedAccess : 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。

; HGROUP OpenClusterGroupEx(HCLUSTER hCluster, LPCWSTR lpszGroupName, DWORD dwDesiredAccess, DWORD* lpdwGrantedAccess)
#uselib "CLUSAPI.dll"
#cfunc global OpenClusterGroupEx "OpenClusterGroupEx" intptr, wstr, int, var
; res = OpenClusterGroupEx(hCluster, lpszGroupName, dwDesiredAccess, lpdwGrantedAccess)
; hCluster : HCLUSTER -> "intptr"
; lpszGroupName : LPCWSTR optional -> "wstr"
; dwDesiredAccess : DWORD -> "int"
; lpdwGrantedAccess : 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")
	procOpenClusterGroupEx = clusapi.NewProc("OpenClusterGroupEx")
)

// hCluster (HCLUSTER), lpszGroupName (LPCWSTR optional), dwDesiredAccess (DWORD), lpdwGrantedAccess (DWORD* optional, out)
r1, _, err := procOpenClusterGroupEx.Call(
	uintptr(hCluster),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszGroupName))),
	uintptr(dwDesiredAccess),
	uintptr(lpdwGrantedAccess),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HGROUP

function OpenClusterGroupEx(
  hCluster: NativeInt;   // HCLUSTER
  lpszGroupName: PWideChar;   // LPCWSTR optional
  dwDesiredAccess: DWORD;   // DWORD
  lpdwGrantedAccess: Pointer   // DWORD* optional, out
): NativeInt; stdcall;
  external 'CLUSAPI.dll' name 'OpenClusterGroupEx';

result := DllCall("CLUSAPI\OpenClusterGroupEx"
    , "Ptr", hCluster   ; HCLUSTER
    , "WStr", lpszGroupName   ; LPCWSTR optional
    , "UInt", dwDesiredAccess   ; DWORD
    , "Ptr", lpdwGrantedAccess   ; DWORD* optional, out
    , "Ptr")   ; return: HGROUP

●OpenClusterGroupEx(hCluster, lpszGroupName, dwDesiredAccess, lpdwGrantedAccess) = DLL("CLUSAPI.dll", "int OpenClusterGroupEx(int, char*, dword, void*)")
# 呼び出し: OpenClusterGroupEx(hCluster, lpszGroupName, dwDesiredAccess, lpdwGrantedAccess)
# hCluster : HCLUSTER -> "int"
# lpszGroupName : LPCWSTR optional -> "char*"
# dwDesiredAccess : DWORD -> "dword"
# lpdwGrantedAccess : 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)。