RasGetProjectionInfoEx

// RASAPI32.dll
#include <windows.h>

DWORD RasGetProjectionInfoEx(
    HRASCONN hrasconn,
    RAS_PROJECTION_INFO* pRasProjection,   // optional
    DWORD* lpdwSize
);

<DllImport("RASAPI32.dll", ExactSpelling:=True)>
Public Shared Function RasGetProjectionInfoEx(
    hrasconn As IntPtr,   ' HRASCONN
    pRasProjection As IntPtr,   ' RAS_PROJECTION_INFO* optional, in/out
    ByRef lpdwSize As UInteger   ' DWORD* in/out
) As UInteger
End Function

' hrasconn : HRASCONN
' pRasProjection : RAS_PROJECTION_INFO* optional, in/out
' lpdwSize : DWORD* in/out
Declare PtrSafe Function RasGetProjectionInfoEx Lib "rasapi32" ( _
    ByVal hrasconn As LongPtr, _
    ByVal pRasProjection As LongPtr, _
    ByRef lpdwSize 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

RasGetProjectionInfoEx = ctypes.windll.rasapi32.RasGetProjectionInfoEx
RasGetProjectionInfoEx.restype = wintypes.DWORD
RasGetProjectionInfoEx.argtypes = [
    wintypes.HANDLE,  # hrasconn : HRASCONN
    ctypes.c_void_p,  # pRasProjection : RAS_PROJECTION_INFO* optional, in/out
    ctypes.POINTER(wintypes.DWORD),  # lpdwSize : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('RASAPI32.dll')
RasGetProjectionInfoEx = Fiddle::Function.new(
  lib['RasGetProjectionInfoEx'],
  [
    Fiddle::TYPE_VOIDP,  # hrasconn : HRASCONN
    Fiddle::TYPE_VOIDP,  # pRasProjection : RAS_PROJECTION_INFO* optional, in/out
    Fiddle::TYPE_VOIDP,  # lpdwSize : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "rasapi32")]
extern "system" {
    fn RasGetProjectionInfoEx(
        hrasconn: *mut core::ffi::c_void,  // HRASCONN
        pRasProjection: *mut RAS_PROJECTION_INFO,  // RAS_PROJECTION_INFO* optional, in/out
        lpdwSize: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("RASAPI32.dll")]
public static extern uint RasGetProjectionInfoEx(IntPtr hrasconn, IntPtr pRasProjection, ref uint lpdwSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'RASAPI32_RasGetProjectionInfoEx' -Namespace Win32 -PassThru
# $api::RasGetProjectionInfoEx(hrasconn, pRasProjection, lpdwSize)

#uselib "RASAPI32.dll"
#func global RasGetProjectionInfoEx "RasGetProjectionInfoEx" sptr, sptr, sptr
; RasGetProjectionInfoEx hrasconn, varptr(pRasProjection), varptr(lpdwSize)   ; 戻り値は stat
; hrasconn : HRASCONN -> "sptr"
; pRasProjection : RAS_PROJECTION_INFO* optional, in/out -> "sptr"
; lpdwSize : DWORD* 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 "RASAPI32.dll"
#cfunc global RasGetProjectionInfoEx "RasGetProjectionInfoEx" sptr, var, var
; res = RasGetProjectionInfoEx(hrasconn, pRasProjection, lpdwSize)
; hrasconn : HRASCONN -> "sptr"
; pRasProjection : RAS_PROJECTION_INFO* optional, in/out -> "var"
; lpdwSize : DWORD* 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。

; DWORD RasGetProjectionInfoEx(HRASCONN hrasconn, RAS_PROJECTION_INFO* pRasProjection, DWORD* lpdwSize)
#uselib "RASAPI32.dll"
#cfunc global RasGetProjectionInfoEx "RasGetProjectionInfoEx" intptr, var, var
; res = RasGetProjectionInfoEx(hrasconn, pRasProjection, lpdwSize)
; hrasconn : HRASCONN -> "intptr"
; pRasProjection : RAS_PROJECTION_INFO* optional, in/out -> "var"
; lpdwSize : DWORD* 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 (
	rasapi32 = windows.NewLazySystemDLL("RASAPI32.dll")
	procRasGetProjectionInfoEx = rasapi32.NewProc("RasGetProjectionInfoEx")
)

// hrasconn (HRASCONN), pRasProjection (RAS_PROJECTION_INFO* optional, in/out), lpdwSize (DWORD* in/out)
r1, _, err := procRasGetProjectionInfoEx.Call(
	uintptr(hrasconn),
	uintptr(pRasProjection),
	uintptr(lpdwSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function RasGetProjectionInfoEx(
  hrasconn: THandle;   // HRASCONN
  pRasProjection: Pointer;   // RAS_PROJECTION_INFO* optional, in/out
  lpdwSize: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'RASAPI32.dll' name 'RasGetProjectionInfoEx';

result := DllCall("RASAPI32\RasGetProjectionInfoEx"
    , "Ptr", hrasconn   ; HRASCONN
    , "Ptr", pRasProjection   ; RAS_PROJECTION_INFO* optional, in/out
    , "Ptr", lpdwSize   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●RasGetProjectionInfoEx(hrasconn, pRasProjection, lpdwSize) = DLL("RASAPI32.dll", "dword RasGetProjectionInfoEx(void*, void*, void*)")
# 呼び出し: RasGetProjectionInfoEx(hrasconn, pRasProjection, lpdwSize)
# hrasconn : HRASCONN -> "void*"
# pRasProjection : RAS_PROJECTION_INFO* optional, in/out -> "void*"
# lpdwSize : DWORD* 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)。