NetGetJoinInformation

// NETAPI32.dll
#include <windows.h>

DWORD NetGetJoinInformation(
    LPCWSTR lpServer,   // optional
    LPWSTR* lpNameBuffer,
    NETSETUP_JOIN_STATUS* BufferType
);

<DllImport("NETAPI32.dll", ExactSpelling:=True)>
Public Shared Function NetGetJoinInformation(
    <MarshalAs(UnmanagedType.LPWStr)> lpServer As String,   ' LPCWSTR optional
    lpNameBuffer As IntPtr,   ' LPWSTR* out
    <Out> ByRef BufferType As Integer   ' NETSETUP_JOIN_STATUS* out
) As UInteger
End Function

' lpServer : LPCWSTR optional
' lpNameBuffer : LPWSTR* out
' BufferType : NETSETUP_JOIN_STATUS* out
Declare PtrSafe Function NetGetJoinInformation Lib "netapi32" ( _
    ByVal lpServer As LongPtr, _
    ByVal lpNameBuffer As LongPtr, _
    ByRef BufferType As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

NetGetJoinInformation = ctypes.windll.netapi32.NetGetJoinInformation
NetGetJoinInformation.restype = wintypes.DWORD
NetGetJoinInformation.argtypes = [
    wintypes.LPCWSTR,  # lpServer : LPCWSTR optional
    ctypes.c_void_p,  # lpNameBuffer : LPWSTR* out
    ctypes.c_void_p,  # BufferType : NETSETUP_JOIN_STATUS* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('NETAPI32.dll')
NetGetJoinInformation = Fiddle::Function.new(
  lib['NetGetJoinInformation'],
  [
    Fiddle::TYPE_VOIDP,  # lpServer : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # lpNameBuffer : LPWSTR* out
    Fiddle::TYPE_VOIDP,  # BufferType : NETSETUP_JOIN_STATUS* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "netapi32")]
extern "system" {
    fn NetGetJoinInformation(
        lpServer: *const u16,  // LPCWSTR optional
        lpNameBuffer: *mut *mut u16,  // LPWSTR* out
        BufferType: *mut i32  // NETSETUP_JOIN_STATUS* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("NETAPI32.dll")]
public static extern uint NetGetJoinInformation([MarshalAs(UnmanagedType.LPWStr)] string lpServer, IntPtr lpNameBuffer, out int BufferType);
"@
$api = Add-Type -MemberDefinition $sig -Name 'NETAPI32_NetGetJoinInformation' -Namespace Win32 -PassThru
# $api::NetGetJoinInformation(lpServer, lpNameBuffer, BufferType)

#uselib "NETAPI32.dll"
#func global NetGetJoinInformation "NetGetJoinInformation" sptr, sptr, sptr
; NetGetJoinInformation lpServer, varptr(lpNameBuffer), BufferType   ; 戻り値は stat
; lpServer : LPCWSTR optional -> "sptr"
; lpNameBuffer : LPWSTR* out -> "sptr"
; BufferType : NETSETUP_JOIN_STATUS* 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 "NETAPI32.dll"
#cfunc global NetGetJoinInformation "NetGetJoinInformation" wstr, var, int
; res = NetGetJoinInformation(lpServer, lpNameBuffer, BufferType)
; lpServer : LPCWSTR optional -> "wstr"
; lpNameBuffer : LPWSTR* out -> "var"
; BufferType : NETSETUP_JOIN_STATUS* out -> "int"
; ※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。

; DWORD NetGetJoinInformation(LPCWSTR lpServer, LPWSTR* lpNameBuffer, NETSETUP_JOIN_STATUS* BufferType)
#uselib "NETAPI32.dll"
#cfunc global NetGetJoinInformation "NetGetJoinInformation" wstr, var, int
; res = NetGetJoinInformation(lpServer, lpNameBuffer, BufferType)
; lpServer : LPCWSTR optional -> "wstr"
; lpNameBuffer : LPWSTR* out -> "var"
; BufferType : NETSETUP_JOIN_STATUS* out -> "int"
; ※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 (
	netapi32 = windows.NewLazySystemDLL("NETAPI32.dll")
	procNetGetJoinInformation = netapi32.NewProc("NetGetJoinInformation")
)

// lpServer (LPCWSTR optional), lpNameBuffer (LPWSTR* out), BufferType (NETSETUP_JOIN_STATUS* out)
r1, _, err := procNetGetJoinInformation.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpServer))),
	uintptr(lpNameBuffer),
	uintptr(BufferType),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function NetGetJoinInformation(
  lpServer: PWideChar;   // LPCWSTR optional
  lpNameBuffer: PPWideChar;   // LPWSTR* out
  BufferType: Pointer   // NETSETUP_JOIN_STATUS* out
): DWORD; stdcall;
  external 'NETAPI32.dll' name 'NetGetJoinInformation';

result := DllCall("NETAPI32\NetGetJoinInformation"
    , "WStr", lpServer   ; LPCWSTR optional
    , "Ptr", lpNameBuffer   ; LPWSTR* out
    , "Ptr", BufferType   ; NETSETUP_JOIN_STATUS* out
    , "UInt")   ; return: DWORD

●NetGetJoinInformation(lpServer, lpNameBuffer, BufferType) = DLL("NETAPI32.dll", "dword NetGetJoinInformation(char*, void*, void*)")
# 呼び出し: NetGetJoinInformation(lpServer, lpNameBuffer, BufferType)
# lpServer : LPCWSTR optional -> "char*"
# lpNameBuffer : LPWSTR* out -> "void*"
# BufferType : NETSETUP_JOIN_STATUS* 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)。