c# 网络编程知识整理（一）

来源：互联网发布：网络棋牌骗局编辑：程序博客网时间：2024/06/06 19:20

今天学习了c#网络编程的一些东西，在这里记下来。

1、客户端连接远程服务器

TcpClient client = new TcpClient();
client.Connect(IPAddress.Parse("192.168.0.123"), 8500);

2、服务端打开端口等待客户端连接

     IPAddress ip = new IPAddress(new byte[] { 192, 168, 0, 123 });
      TcpListener listener = new TcpListener(ip, 8500);
      listener.Start();
      Console.WriteLine("Start Listenning ...");
      while (true)
      {
         TcpClient client = listener.AcceptTcpClient();
      }

3、发送消息

byte[] temp = Encoding.Unicode.GetBytes(msg);

NetworkStream streamToServer.Write(temp, 0, temp.Length);

同步接收消息

int byteRead = streamToClient.Read(buffer, 0, 8192);

string msg = Encoding.Unicode.GetString(buffer, 0, byteRead);

异步接收消息

AsyncCallback callBack = new AsyncCallback(ReadComplete);
streamToServer.BeginRead(buffer, 0, BufferSize, callBack, null);

ReadComplete（IAsyncResult ar）是回调函数，当异步接收执行完成以后，会自动调用回调函数。

        private void ReadComplete(IAsyncResult ar)
        {
            int bytesRead;
            try
            {
                lock (streamToServer)
                {
                    bytesRead = streamToServer.EndRead(ar);
                }
                if (bytesRead == 0)
                {
                    throw new Exception("读取到0字节");
                }
                string msg = Encoding.Unicode.GetString(buffer, 0, bytesRead);
                Console.WriteLine("Received: {0}",msg);
                Array.Clear(buffer, 0, buffer.Length);
                lock (streamToServer)
                {
                    AsyncCallback callBack = new AsyncCallback(ReadComplete);
                    streamToServer.BeginRead(buffer, 0, BufferSize, callBack, null);
                }
            }
            catch(Exception ex)
            {
                if (streamToServer != null)
                {
                    streamToServer.Dispose();
                    client.Close();
                    Console.WriteLine(ex.Message);
                    return;
                }
            }
        }