帶有確認的TCP IP服務器並再次接收數據

Question

我已經開發了使用C＃偵聽端口的TCP / IP服務器，並且GPS設備正在將數據發送到服務器。

最初，設備將IMEI編號發送到服務器，服務器以01進行確認。在收到設備的確認后，新的數據包將發送到服務器。

我能夠通過TCP服務器獲取IMEI號，並且在發送確認后，我無法從客戶端接收新的數據包數據。 我也在下面包含我的代碼。 請讓我知道我錯了。

我已經使用Hercules tcp服務器工具進行了測試，下一個數據包已成功接收，但是從我的應用程序無法正常工作。

           try
        {
            IPAddress ipAdress = IPAddress.Parse(ConfigurationManager.AppSettings["Server"].ToString());
            // You can use local IP as far as you use the 
            //same in client

            // Initializes the Listener
            TcpListener myList = new TcpListener(ipAdress, int.Parse(ConfigurationManager.AppSettings["Port"].ToString()));

            for (; ; )
            { // Run forever, accepting and servicing connections
                //Start Listeneting at the specified port

                myList.Start();

                Console.WriteLine("Server running - Port: 8000");
                Console.WriteLine("Local end point:" + myList.LocalEndpoint);
                Console.WriteLine("Waiting for connections...");

                Socket socket = myList.AcceptSocket();
                // When accepted
                Console.WriteLine("Connection accepted from " + socket.RemoteEndPoint);

                byte[] b = new byte[1000];
                int k = socket.Receive(b);


                Console.WriteLine("echoed {0} bytes.", k);
                Console.WriteLine("Reading IMEI....");

                string hexStr = ConvertAsciiToHex(Encoding.ASCII.GetString(b, 0, b.Length));
                File.WriteAllText(@"C:\ClientFiles\testIMEI", hexStr);


                ASCIIEncoding asen = new ASCIIEncoding();
                string response = "01";
                Console.WriteLine("Ackowledgement Data - " + response);
                //
                int sentBytes = socket.Send(asen.GetBytes(response));
                Console.WriteLine("Acknowledgement data sent!\n");

                int count = 0;

                while (socket.Poll(-1, SelectMode.SelectRead))
                {
                    b = new byte[1000];
                    k = socket.Receive(b);
                    if (k > 0)
                    {
                        count++;
                        Console.WriteLine("Reading Client Data - Count - " + count.ToString() + " and lenght " + k.ToString());
                        hexStr = ConvertAsciiToHex(Encoding.ASCII.GetString(b, 0, b.Length));
                        File.WriteAllText(@"C:\ClientFiles\testData" + count.ToString(), hexStr);
                    }
                }

                socket.Shutdown(SocketShutdown.Both);
                socket.Close();
            }


            myList.Stop();
        }
        catch (Exception ex)
        {
            File.WriteAllText(@"C:\ClientFiles\Error.txt", ex.Message + "****" + ex.InnerException);
        }

Answer 1

除了這些注釋，我看不到程序中的任何錯誤：

 // Don't use the b.Length in this command:
 string hexStr = ConvertAsciiToHex(Encoding.ASCII.GetString(b, 0, b.Length));
 // use k instead, the numbers actually read, not the length of the buffer.
 string hexStr = ConvertAsciiToHex(Encoding.ASCII.GetString(b, 0, k)); 

 while (socket.Poll(-1, SelectMode.SelectRead))
 {
     // b has been allocated, don't need this
     // b = new byte[1000];
     k = socket.Receive(b);
     if (k > 0)
     {
         count++;
         Console.WriteLine("Reading Client Data - Count - " + count.ToString() + " and lenght " + k.ToString();
        // use k not Length
        hexStr = ConvertAsciiToHex(Encoding.ASCII.GetString(b, 0, k /*b.Length*/));
        File.WriteAllText(@"C:\ClientFiles\testData" + count.ToString(), hexStr);
     }
}

您知道“輪詢”命令是否返回過嗎？ 可能是它引發了一個錯誤，而您卻錯過了那個錯誤。 看看這個。