[program-l] Re: C# port forwarding problem
- From: "Ian Sharpe" <isforums@xxxxxxxx>
- To: <program-l@xxxxxxxxxxxxx>
- Date: Tue, 18 Oct 2011 09:56:06 +0100
Hi Mesut
I'm not familiar with this library but is suspect if you test your local
variable mappings for null before the loop it will be null. Take a look at
the documentation for this library to see if there is anything you need to
do in order to initialise the class so that u.StaticPortMappingCollection
returns a valid collection.
Cheers
Ian
-----Original Message-----
From: program-l-bounce@xxxxxxxxxxxxx [mailto:program-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Mesut
Sent: 18 October 2011 00:22
To: program-l@xxxxxxxxxxxxx
Subject: [program-l] C# port forwarding problem
Hi all. I'm developping a peer-to-peer application. But have problems
dealing with IPv4. So I must use windows port forwarding. For this,
"NATUPNPLib.dll" is used. And I've added this file to references section and
"NATUPNPLib" namespace to "using" section of VS document. Following lines
contains my codes. But I'm encountering with a null references exception.
I'd be glad to help.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Net.Sockets;
using System.Net;
using NATUPNPLib;
namespace ConsoleApplication4
{
class Program
{
static void Main(string[] args)
{
try
{
UPnPNATClass u = new UPnPNATClass();
IStaticPortMappingCollection mappings = u.StaticPortMappingCollection;
// just following line throws a null reference exception
foreach (IStaticPortMapping map in mappings)
{
// also this line makes so
Console.WriteLine(map.ExternalIPAddress);
}
// shortly, all implimentation about "u" instance throws a null reference
exception
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
Console.ReadKey();
}
}
}
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