OpenClusterGroupSet

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

HGROUPSET OpenClusterGroupSet(
    HCLUSTER hCluster,
    LPCWSTR lpszGroupSetName
);

<DllImport("CLUSAPI.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function OpenClusterGroupSet(
    hCluster As IntPtr,   ' HCLUSTER
    <MarshalAs(UnmanagedType.LPWStr)> lpszGroupSetName As String   ' LPCWSTR
) As IntPtr
End Function

' hCluster : HCLUSTER
' lpszGroupSetName : LPCWSTR
Declare PtrSafe Function OpenClusterGroupSet Lib "clusapi" ( _
    ByVal hCluster As LongPtr, _
    ByVal lpszGroupSetName 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

OpenClusterGroupSet = ctypes.windll.clusapi.OpenClusterGroupSet
OpenClusterGroupSet.restype = ctypes.c_ssize_t
OpenClusterGroupSet.argtypes = [
    ctypes.c_ssize_t,  # hCluster : HCLUSTER
    wintypes.LPCWSTR,  # lpszGroupSetName : LPCWSTR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('CLUSAPI.dll')
OpenClusterGroupSet = Fiddle::Function.new(
  lib['OpenClusterGroupSet'],
  [
    Fiddle::TYPE_INTPTR_T,  # hCluster : HCLUSTER
    Fiddle::TYPE_VOIDP,  # lpszGroupSetName : LPCWSTR
  ],
  Fiddle::TYPE_INTPTR_T)

#[link(name = "clusapi")]
extern "system" {
    fn OpenClusterGroupSet(
        hCluster: isize,  // HCLUSTER
        lpszGroupSetName: *const u16  // LPCWSTR
    ) -> isize;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("CLUSAPI.dll", SetLastError = true)]
public static extern IntPtr OpenClusterGroupSet(IntPtr hCluster, [MarshalAs(UnmanagedType.LPWStr)] string lpszGroupSetName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'CLUSAPI_OpenClusterGroupSet' -Namespace Win32 -PassThru
# $api::OpenClusterGroupSet(hCluster, lpszGroupSetName)

#uselib "CLUSAPI.dll"
#func global OpenClusterGroupSet "OpenClusterGroupSet" sptr, sptr
; OpenClusterGroupSet hCluster, lpszGroupSetName   ; 戻り値は stat
; hCluster : HCLUSTER -> "sptr"
; lpszGroupSetName : LPCWSTR -> "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 OpenClusterGroupSet "OpenClusterGroupSet" sptr, wstr
; res = OpenClusterGroupSet(hCluster, lpszGroupSetName)
; hCluster : HCLUSTER -> "sptr"
; lpszGroupSetName : LPCWSTR -> "wstr"

; HGROUPSET OpenClusterGroupSet(HCLUSTER hCluster, LPCWSTR lpszGroupSetName)
#uselib "CLUSAPI.dll"
#cfunc global OpenClusterGroupSet "OpenClusterGroupSet" intptr, wstr
; res = OpenClusterGroupSet(hCluster, lpszGroupSetName)
; hCluster : HCLUSTER -> "intptr"
; lpszGroupSetName : LPCWSTR -> "wstr"

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

var (
	clusapi = windows.NewLazySystemDLL("CLUSAPI.dll")
	procOpenClusterGroupSet = clusapi.NewProc("OpenClusterGroupSet")
)

// hCluster (HCLUSTER), lpszGroupSetName (LPCWSTR)
r1, _, err := procOpenClusterGroupSet.Call(
	uintptr(hCluster),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszGroupSetName))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HGROUPSET

function OpenClusterGroupSet(
  hCluster: NativeInt;   // HCLUSTER
  lpszGroupSetName: PWideChar   // LPCWSTR
): NativeInt; stdcall;
  external 'CLUSAPI.dll' name 'OpenClusterGroupSet';

result := DllCall("CLUSAPI\OpenClusterGroupSet"
    , "Ptr", hCluster   ; HCLUSTER
    , "WStr", lpszGroupSetName   ; LPCWSTR
    , "Ptr")   ; return: HGROUPSET

●OpenClusterGroupSet(hCluster, lpszGroupSetName) = DLL("CLUSAPI.dll", "int OpenClusterGroupSet(int, char*)")
# 呼び出し: OpenClusterGroupSet(hCluster, lpszGroupSetName)
# hCluster : HCLUSTER -> "int"
# lpszGroupSetName : 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)。