rasapi32.dll call help

Hi all, I'm after some help with Dll calls because I'd like remove dependance on a CLI command.

I've got a small script that I've created as a simple VPN connection indicator that toggles a tray icon depending on monitored Events, (ID 20267 and 20268), but to get the initial state I make a call to rasdial.exe and parse the output.

Here's what I use to get the VPN status at program start:
 

#include <Constants.au3>

ConsoleWrite(_GetVPNState() & @CRLF)

Func _GetVPNState() ; Calls rasdial.exe to get initial VPN state
    While ProcessExists("rasdial.exe")
        Sleep(250)
    WEnd
    Local $temp = Run(@ComSpec & ' /c rasdial.exe', '.', @SW_HIDE, $STDOUT_CHILD)
    If @error Then
        MsgBox(24, "VPN Indicator", "Failed to run rasdial.exe for initial state", 5)
    EndIf
    Local $output = ""
    While True
        $output &= StdoutRead($temp)
        If @error <> 0 Then ExitLoop
    WEnd
    StdioClose($temp)
    If StringInStr($output, "No connections") = 0 Then
        $temp = StringSplit($output, @CRLF)
        $sConnection = $temp[2] ; Phonebook entry name
    Else
        $sConnection = "Not connected"
    EndIf
    Return $sConnection
EndFunc   ;==>_GetVPNState

I'd like to use rasapi32.dll for the required call but I can't seem to wrap my head around the required Dll* statements for the functions: RasEnumConnections and RasGetConnectStatus.
 

Below is what I've been playing with just trying to get a buffer size back from the function, (for when a VPN is active), I'm not having much luck.

#Region ;**** Directives created by AutoIt3Wrapper_GUI ****
#AutoIt3Wrapper_Version=Beta
#AutoIt3Wrapper_UseUpx=n
#EndRegion ;**** Directives created by AutoIt3Wrapper_GUI ****

Global $rasdll = "rasapi32.dll"

$tagRASCONNdata = "dword dwSize;" & _
        "handle hrasconn;" & _
        "wchar szEntryName[256];" & _
        "wchar szDeviceType[256];" & _
        "wchar szDeviceName[128];" & _
        "wchar szPhonebook[128];" & _
        "dword dwSubEntry;" & _
        "byte guidEntry[16];" & _
        "dword dwFlags;" & _
        "int64 luid;" & _
        "byte guidCorrelationId[16]"

$hDll = DllOpen($rasdll)
If @error Then Exit MsgBox(0, "", "DllOpen error: " & @error)
ConsoleWrite("DLL handle: " & $hDll & @CRLF)
Local $tRASCONN = DllStructCreate($tagRASCONNdata)
If @error Then Exit MsgBox(0, "", "DllStructCreate error: " & @error)
DllStructSetData($tRASCONN, "Size", DllStructGetSize($tRASCONN))
ConsoleWrite("DLLStructure: " & DllStructGetSize($tRASCONN) & @CRLF)
Local $iBufferSize = 0
Local $NULL = NULL
; Call RasEnumConnections with NULL and 0 to return required buffer size
$iRet = DllCall($hDll, "int", "RasEnumConnectionsW", "ptr", $NULL, "ptr", $iBufferSize, "ptr", DllStructGetPtr($tRASCONN))
ConsoleWrite("DllCall return: " & $iRet & @CRLF)
ConsoleWrite("Buffer size: " & $iBufferSize & @CRLF)
DllClose($hDll)

I'd be grateful if someone could point me at an example that approximates what I want to do, ie. same kind of function with data structure, etc, so I can get an idea of how I should be doing it.

Alternatively, If someone is hiding a long lost RAS UDF on their drive I'd be even more grateful

Below is the links to the functions I want to use, thanks for any help.

http://msdn.microsoft.com/en-us/library/windows/desktop/aa377284%28v=vs.85%29.aspx
DWORD RasEnumConnections(
    _Inout_  LPRASCONN lprasconn,    ;    OUT: Pointer to buffer of RASCONN structures  IN: Set sizeof(RASCONN) on first entry
    _Inout_  LPDWORD lpcb,                ;    IN: Size of buffer in bytes  OUT: Number of bytes req to enumerate RAS connections
    _Out_    LPDWORD lpcConnections    ; Number of RASCONN structures in buffer
);

http://msdn.microsoft.com/en-us/library/windows/desktop/aa376725%28v=vs.85%29.aspx
RASCONN Structure
typedef struct & _RASCONN {
    DWORD            dwSize;            ; sizeof(RASSCON)
    HRASCONN        hrasconn;            ; HRASCONN handle that defines the remote access connection.
    TCHAR                szEntryName[RAS_MaxEntryName + 1];
    TCHAR                szDeviceType[RAS_MaxDeviceType + 1];
    TCHAR                szDeviceName[RAS_MaxDeviceName + 1];
    TCHAR                szPhonebook[MAX_PATH ];
    DWORD            dwSubEntry;
    GUID                guidEntry;
    DWORD            dwFlags;
    LUID                luid;
    GUID                guidCorrelationId;
} RASCONN, *PRASCONN;

http://msdn.microsoft.com/en-us/library/windows/desktop/aa377503%28v=vs.85%29.aspx
DWORD RasGetConnectStatus(
    _In_     HRASCONN hrasconn,
    _Inout_  LPRASCONNSTATUS lprasconnstatus
);

http://msdn.microsoft.com/en-us/library/windows/desktop/aa376728%28v=vs.85%29.aspx
typedef struct & _RASCONNSTATUS {
    DWORD                            dwSize;        ; sizeof(RASCONNSTATUS
    RASCONNSTATE                rasconnstate;
    DWORD                            dwError;
    TCHAR                                szDeviceType[RAS_MaxDeviceType + 1];
    TCHAR                                szDeviceName[RAS_MaxDeviceName + 1];
    TCHAR                                szPhoneNumber[RAS_MaxPhoneNumber + 1];
    RASTUNNELENDPOINT    localEndPoint;
    RASTUNNELENDPOINT    remoteEndPoint;
    RASCONNSUBSTATE        rasconnsubstate;
} RASCONNSTATUS;