C#•3mo ago

TcpClient being Disposed

I am pretty new to C#'s Dispose system, i came from JVM stuff so i'm pretty familiar with OOP. Error:

Client Error: Cannot access a disposed object.
Object name: 'System.Net.Sockets.NetworkStream'.

Client Error: Cannot access a disposed object.
Object name: 'System.Net.Sockets.NetworkStream'.

Code:

public class ServerClient : IPacketable
{
    public readonly TcpClient Client;
    public readonly NetworkStream Stream;
    
    public ServerClient(TcpClient client)
    {
        Client = client;
        Stream = client.GetStream();
        
        Thread clientThread = new Thread(Init);
        clientThread.Start();
    }

    private void Init()
    {
        try
        {
            string clientAddress = ((IPEndPoint) Client.Client.RemoteEndPoint).Address.ToString();
            Console.WriteLine("Handling client from: " + clientAddress);

            new PacketListener(this);
            SendHandshakePacket(HandshakePacket.ConnectionState.Login);
        }
        catch (Exception e)
        {
            Console.WriteLine("Client Error: " + e.Message);
        }
    }

    public void SendHandshakePacket(HandshakePacket.ConnectionState state)
    {
        HandshakePacket packet = new HandshakePacket(
            protocolVersion: 754,
            serverAddress: "localhost",
            serverPort: 25565,
            nextState: state
        );
        
        SendPacket(packet);
    }
    
    public void SendPacket(IPacket packet)
    {
        byte[] packetBytes = packet.ToByteArray();
        Stream.Write(packetBytes, 0, packetBytes.Length);   
    }
}

public class ServerClient : IPacketable
{
    public readonly TcpClient Client;
    public readonly NetworkStream Stream;
    
    public ServerClient(TcpClient client)
    {
        Client = client;
        Stream = client.GetStream();
        
        Thread clientThread = new Thread(Init);
        clientThread.Start();
    }

    private void Init()
    {
        try
        {
            string clientAddress = ((IPEndPoint) Client.Client.RemoteEndPoint).Address.ToString();
            Console.WriteLine("Handling client from: " + clientAddress);

            new PacketListener(this);
            SendHandshakePacket(HandshakePacket.ConnectionState.Login);
        }
        catch (Exception e)
        {
            Console.WriteLine("Client Error: " + e.Message);
        }
    }

    public void SendHandshakePacket(HandshakePacket.ConnectionState state)
    {
        HandshakePacket packet = new HandshakePacket(
            protocolVersion: 754,
            serverAddress: "localhost",
            serverPort: 25565,
            nextState: state
        );
        
        SendPacket(packet);
    }
    
    public void SendPacket(IPacket packet)
    {
        byte[] packetBytes = packet.ToByteArray();
        Stream.Write(packetBytes, 0, packetBytes.Length);   
    }
}

8 Replies

Outspending•3mo ago

its erroring from

Stream.Write(packetBytes, 0, packetBytes.Length);

Stream.Write(packetBytes, 0, packetBytes.Length);

when im trying to send the handshake packet

Jimmacle•3mo ago

you aren't disposing the client anywhere here, where is the code that constructs one of these objects?

Outspending•3mo ago

this is the class that is creating the ServerClient:

public class ServerConnection
{
    private static bool _IsRunning;
    
    private readonly TcpListener _listener;
    
    public ServerConnection(IPAddress address, int port)
    {
        if (_IsRunning)
        {
            throw new Exception("Server is already running.");
        }
        
        _listener = new TcpListener(address, port);
        _IsRunning = true;
    }

    public void Init()
    {
        try
        {
            _listener.Start();
            Console.WriteLine("Server started. Waiting for connections...");
            
            TcpClient client = _listener.AcceptTcpClient();
            Console.WriteLine("Client connected.");

            new ServerClient(client);
        }
        catch (Exception e)
        {
            Console.WriteLine("Server Error: " + e.Message);
        }
    }
}

public class ServerConnection
{
    private static bool _IsRunning;
    
    private readonly TcpListener _listener;
    
    public ServerConnection(IPAddress address, int port)
    {
        if (_IsRunning)
        {
            throw new Exception("Server is already running.");
        }
        
        _listener = new TcpListener(address, port);
        _IsRunning = true;
    }

    public void Init()
    {
        try
        {
            _listener.Start();
            Console.WriteLine("Server started. Waiting for connections...");
            
            TcpClient client = _listener.AcceptTcpClient();
            Console.WriteLine("Client connected.");

            new ServerClient(client);
        }
        catch (Exception e)
        {
            Console.WriteLine("Server Error: " + e.Message);
        }
    }
}

i thought it was just because i was storing the TcpStream inside the class but i tried just method and idk not sure why it ain't workin works fine up until i try to connect aka sending the HandshakePacket

Outspending•3mo ago

Jimmacle•3mo ago

what code logs "client has disconnected"?

Outspending•3mo ago

public class PacketListener
{
    private bool _isRunning;
    
    public PacketListener(ServerClient client)
    {
        _isRunning = true;

        NetworkStream stream = client.Stream;
        while (_isRunning)
        {
            byte[] buffer = new byte[1024];
            int bytesRead = stream.Read(buffer, 0, buffer.Length);

            if (bytesRead > 0)
            {
                stream.Write(buffer, 0, bytesRead);
            }
            else
            {
                break;
            }
        }
        
        client.Client.Close();
        Console.WriteLine("Client has disconnected.");
    }

    public void Stop()
    {
        _isRunning = false;
    }
}

public class PacketListener
{
    private bool _isRunning;
    
    public PacketListener(ServerClient client)
    {
        _isRunning = true;

        NetworkStream stream = client.Stream;
        while (_isRunning)
        {
            byte[] buffer = new byte[1024];
            int bytesRead = stream.Read(buffer, 0, buffer.Length);

            if (bytesRead > 0)
            {
                stream.Write(buffer, 0, bytesRead);
            }
            else
            {
                break;
            }
        }
        
        client.Client.Close();
        Console.WriteLine("Client has disconnected.");
    }

    public void Stop()
    {
        _isRunning = false;
    }
}

legit very messy but i just wanna understand why its doing this wait- maybe its breaking the loop... one sec it is 💀 thanks for the help, its disposing cuz im closing the connection i'm so dumb yep, i just had to send the handshake packet before i started listening for packets

Jimmacle•3mo ago

:pepeOK: fyi, TcpClient and raw threads are kind of outdated Socket and Tasks are preferred instead

Outspending•3mo ago

epic ty

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TcpClient being Disposed