BeginRead

时间:2016-09-07 15:18:45

标签: c# object tcpclient networkstream binaryformatter

这个小项目背后的想法是开发一个聊天应用程序,区别在于我想发送对象而不是简单的字符串。到目前为止,这就是我所拥有的。

如果我对构造函数进行反序列化,它可以正常工作(UserDTO现在只有2个字符串字段),但是,我计划让多个客户端随时将数据发送到服务器。我很难理解它是如何工作的以及如何修复错误(就像这样,它在“Deseralize”行中提出了“类型'System.OutOfMemoryException'的异常。”即使在阅读了MS的文档之后我也是如此喜欢你们的一些想法。

注意尝试编译它的人:Binaryformatter有一种方法可以这样做:假设UserDTO有属性字符串Name,string Email 将此类应用于客户端和服务器,您必须使用类库构建它并将此引用添加到两个项目中,因为无论如何二进制格式化表示即使您在两个项目中创建相同的类,反序列化声明它也无法映射宾语。我将在下面留下我正在使用的客户端样本。

服务器:

class Program {
const int serverPort = 60967;
static List<UserConnection> clientList = new List<UserConnection>();
static TcpListener listener;
static Thread listenerThread;


static void Main(string[] args) {
        listenerThread = new Thread(new ThreadStart(DoListen));
        listenerThread.Start();
        Console.WriteLine("Server Started");
        //while (true) {
            string a = Console.ReadLine()
        //}
   }

static void DoListen() {
        try {
            listener = new TcpListener(System.Net.IPAddress.Any, serverPort);
            listener.Start();
            Console.WriteLine("Listening [...]");
            do {
                UserConnection client = new UserConnection(listener.AcceptTcpClient());
                //clientList.Add(client);
                Console.WriteLine("New connection found"); 
            } while (true);
        }
        catch (Exception ex) {
            Console.WriteLine(ex.ToString());
        }
    }
}



public class UserConnection {
private TcpClient clientInfo;
private byte[] readBuffer = new byte[2000];
const int READ_BUFFER_SIZE = 2000;

public UserConnection(TcpClient client) {
    clientInfo = client;
    clientInfo.GetStream().BeginRead(readBuffer, 0, READ_BUFFER_SIZE, new AsyncCallback(StreamReceiver), null);
}

private void StreamReceiver(IAsyncResult ar) {
    try
    {
        if (client.GetStream().CanRead) {
        lock (clientInfo.GetStream()) {
            var strm = clientInfo.GetStream();
            int BytesRead = clientInfo.GetStream().EndRead(ar);
            BinaryFormatter formatter = new BinaryFormatter();
            var mydat = (UserDTO)formatter.Deserialize(strm);
        }
        lock (clientInfo.GetStream()) {
            clientInfo.GetStream().BeginRead(readBuffer, 0, READ_BUFFER_SIZE, new AsyncCallback(StreamReceiver), null);
        }
    }

    catch (Exception e) {
     Console.WriteLine(ex.ToString());
    }
}

客户端:

class Program {
    static void Main(string[] args) {
            ConnectResult("localhost", 60967);
            Console.ReadLine();
        }
    }

    static string ConnectResult(string ip, int port) {
        try {
            TcpClient client = new TcpClient(ip, port);
            AttemptLogin(client);
            return "Connection Succeeded";
        }
        catch (Exception ex) {
            return "Server is not active.  Please start server and try again.      " + ex.ToString();
        }
    }

    static void AttemptLogin(TcpClient client) {
        UserDTO obj = new UserDTO("email", "username");
        IFormatter formatter = new BinaryFormatter();
        var stream = client.GetStream(); 
        formatter.Serialize(stream, obj);
        Console.WriteLine("Sent Object");
    }
}

1 个答案:

答案 0 :(得分:1)

不要执行所有type="button"次调用,只需抓取流并将其传递到BeginRead()方法。

BinaryFormatter.DeSerialize()

我的猜测是你的流位置已经移动,如果不是最后的话。当您将其传递到public UserConnection(TcpClient client) { clientInfo = client; //clientInfo.GetStream().BeginRead(readBuffer, 0, READ_BUFFER_SIZE, new AsyncCallback(StreamReceiver), null); var strm = clientInfo.GetStream(); BinaryFormatter formatter = new BinaryFormatter(); var mydat = (UserDTO)formatter.Deserialize(strm); } 时,就不再有数据可供阅读。实际上,如果您的DTO不能容纳超过2000个字节,那么您的Deserialize()可能包含您想要的所有数据。如果是这种情况,那么您应该能够使用byte[] readBuffer中的字节来反序列化。