GetClusterGroupState

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

CLUSTER_GROUP_STATE GetClusterGroupState(
    HGROUP hGroup,
    LPWSTR lpszNodeName,   // optional
    DWORD* lpcchNodeName   // optional
);

<DllImport("CLUSAPI.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetClusterGroupState(
    hGroup As IntPtr,   ' HGROUP
    <MarshalAs(UnmanagedType.LPWStr)> lpszNodeName As System.Text.StringBuilder,   ' LPWSTR optional, out
    lpcchNodeName As IntPtr   ' DWORD* optional, in/out
) As Integer
End Function

' hGroup : HGROUP
' lpszNodeName : LPWSTR optional, out
' lpcchNodeName : DWORD* optional, in/out
Declare PtrSafe Function GetClusterGroupState Lib "clusapi" ( _
    ByVal hGroup As LongPtr, _
    ByVal lpszNodeName As LongPtr, _
    ByVal lpcchNodeName 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

GetClusterGroupState = ctypes.windll.clusapi.GetClusterGroupState
GetClusterGroupState.restype = ctypes.c_int
GetClusterGroupState.argtypes = [
    ctypes.c_ssize_t,  # hGroup : HGROUP
    wintypes.LPWSTR,  # lpszNodeName : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # lpcchNodeName : DWORD* optional, in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('CLUSAPI.dll')
GetClusterGroupState = Fiddle::Function.new(
  lib['GetClusterGroupState'],
  [
    Fiddle::TYPE_INTPTR_T,  # hGroup : HGROUP
    Fiddle::TYPE_VOIDP,  # lpszNodeName : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # lpcchNodeName : DWORD* optional, in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "clusapi")]
extern "system" {
    fn GetClusterGroupState(
        hGroup: isize,  // HGROUP
        lpszNodeName: *mut u16,  // LPWSTR optional, out
        lpcchNodeName: *mut u32  // DWORD* optional, in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("CLUSAPI.dll", SetLastError = true)]
public static extern int GetClusterGroupState(IntPtr hGroup, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpszNodeName, IntPtr lpcchNodeName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'CLUSAPI_GetClusterGroupState' -Namespace Win32 -PassThru
# $api::GetClusterGroupState(hGroup, lpszNodeName, lpcchNodeName)

#uselib "CLUSAPI.dll"
#func global GetClusterGroupState "GetClusterGroupState" sptr, sptr, sptr
; GetClusterGroupState hGroup, varptr(lpszNodeName), varptr(lpcchNodeName)   ; 戻り値は stat
; hGroup : HGROUP -> "sptr"
; lpszNodeName : LPWSTR optional, out -> "sptr"
; lpcchNodeName : DWORD* optional, in/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 GetClusterGroupState "GetClusterGroupState" sptr, var, var
; res = GetClusterGroupState(hGroup, lpszNodeName, lpcchNodeName)
; hGroup : HGROUP -> "sptr"
; lpszNodeName : LPWSTR optional, out -> "var"
; lpcchNodeName : DWORD* optional, in/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。

; CLUSTER_GROUP_STATE GetClusterGroupState(HGROUP hGroup, LPWSTR lpszNodeName, DWORD* lpcchNodeName)
#uselib "CLUSAPI.dll"
#cfunc global GetClusterGroupState "GetClusterGroupState" intptr, var, var
; res = GetClusterGroupState(hGroup, lpszNodeName, lpcchNodeName)
; hGroup : HGROUP -> "intptr"
; lpszNodeName : LPWSTR optional, out -> "var"
; lpcchNodeName : DWORD* optional, in/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")
	procGetClusterGroupState = clusapi.NewProc("GetClusterGroupState")
)

// hGroup (HGROUP), lpszNodeName (LPWSTR optional, out), lpcchNodeName (DWORD* optional, in/out)
r1, _, err := procGetClusterGroupState.Call(
	uintptr(hGroup),
	uintptr(lpszNodeName),
	uintptr(lpcchNodeName),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // CLUSTER_GROUP_STATE

function GetClusterGroupState(
  hGroup: NativeInt;   // HGROUP
  lpszNodeName: PWideChar;   // LPWSTR optional, out
  lpcchNodeName: Pointer   // DWORD* optional, in/out
): Integer; stdcall;
  external 'CLUSAPI.dll' name 'GetClusterGroupState';

result := DllCall("CLUSAPI\GetClusterGroupState"
    , "Ptr", hGroup   ; HGROUP
    , "Ptr", lpszNodeName   ; LPWSTR optional, out
    , "Ptr", lpcchNodeName   ; DWORD* optional, in/out
    , "Int")   ; return: CLUSTER_GROUP_STATE

●GetClusterGroupState(hGroup, lpszNodeName, lpcchNodeName) = DLL("CLUSAPI.dll", "int GetClusterGroupState(int, char*, void*)")
# 呼び出し: GetClusterGroupState(hGroup, lpszNodeName, lpcchNodeName)
# hGroup : HGROUP -> "int"
# lpszNodeName : LPWSTR optional, out -> "char*"
# lpcchNodeName : DWORD* optional, in/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)。