关于TCP/IP通信（GPRS—DTU通信）二

这几天做项目碰到棘手的问题。环境监测仪通过RS232/485发送的数据通过DTU传送后，分解成多个包。凄惨的是我不会这样的处理方式。能获取到数据，但是是乱码。比较无奈，不停的测试修改。然后悲戚的发现居然是DTU初始化时，忘记了设备的波特率。跟串口发送设备的波特率一致后，解码正确。

正常情况下，接收到得是以下经过转换后的字符串：

#24d5030C471612081001928000800080008000800009d601b000000000000000000000000000da001100be01ef02

e30319033f0000000000000000000000011a2f5d3c00000000ada8413c83d8993cd39ffd3c68e3083dc381103d84GG

 

根据通信协议可得到相关的转化数据。

 

 

TCP/IP通信主要代码部分如下：

#region /// <summary> /// 开始监听 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void StartListenBTN_Click(object sender, EventArgs e) { //环境监测仪 thThreadread = new Thread(new ThreadStart(TcpEMIServer)); thThreadread.Start();//启动线程 thThreadread.IsBackground = true; StartListenBTN.Enabled = false; } #endregion#region /// <summary> /// 环境监测仪数据读取 /// </summary> private void TcpEMIServer() { portNum = Convert.ToInt32(LocalPortTxt.Text); ipep= new IPEndPoint(IPAddress.Any, portNum); //Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); try { server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); //绑定套接字到端口 server.Bind(ipep); //开始侦听(并堵塞该线程) server.Listen(10); //确认连接 Socket client = server.Accept(); //获得客户端节点对象 IPEndPoint clientep = (IPEndPoint)client.RemoteEndPoint; NetworkStream ns = new NetworkStream(client); // 得到本地的IP地址(是局域网内IP地址) string L_Ip = Dns.Resolve(Dns.GetHostName()).AddressList[0].ToString(); UpdateLocalIpTxtText(L_Ip); //远程IP地址 UpdateIpEndTxtText(clientep.Address.ToString()); //远程端口 UpdatePortEndTxtText(clientep.Port.ToString()); /*******************************************************/ while (!done) { byte[] byteTime = Encoding.ASCII.GetBytes(DateTime.Now.ToString()); try { if (client == null) { client = server.Accept(); ns = new NetworkStream(client); } //ns.Write(byteTime, 0, byteTime.Length); //UpdateListBoxText(System.Text.Encoding.ASCII.GetString(byteTime)); //发送数据 //if (SendText.Text != null && SendText.Text != "") //{ byte[] Txt = Encoding.ASCII.GetBytes(SendText.Text); ns.Write(Txt, 0, Txt.Length); UpdateListBoxText(System.Text.Encoding.ASCII.GetString(byteTime) + " " + "send:" + "" + SendText.Text); //} int bufferLen = client.Available; byte[] recb = new byte[1000]; ns.Read(recb, 0, bufferLen); //数据转换 /**************** HEX **********************/ if (HexOption.Checked == true) { //读取到的数据长度大于0时，进行截取 if (bufferLen > 0) { if (bufferLen > 10) { string m = System.Text.Encoding.ASCII.GetString(recb).Substring(0, bufferLen); UpdateListBoxText(DateTime.Now.ToString() + " " + "待转换数据：" + m); //马姐发送数据为16进制 string str = ""; foreach (byte bt in m) { str += Convert.ToString(bt, 16); } UpdateListBoxText(str); ////数据转换 //EMIDataChange(recb, m); } else { UpdateListBoxText(DateTime.Now.ToString() + " " + "心跳包Receive:" + " " + System.Text.Encoding.ASCII.GetString(recb).Substring(0, bufferLen)); } } } /********** ASCII *************/ if (ASCIIOption.Checked == true) { //读取到的数据长度大于0时，进行截取 if (bufferLen > 0) { if (bufferLen > 10) { /************乱码****************/ string ASCIIm = System.Text.Encoding.ASCII.GetString(recb).Substring(0, bufferLen); recb = System.Text.Encoding.ASCII.GetBytes(ASCIIm); UpdateListBoxText(DateTime.Now.ToString() + "recb长度：" + recb.Length); //转换为16进制 UpdateListBoxText(DateTime.Now.ToString() + " " + "Receive:" + " " + recb); string m = System.Text.Encoding.ASCII.GetString(recb); UpdateListBoxText(DateTime.Now.ToString() + " " + "16进制数据：" + m); //数据转换 EMIDataChange(recb, m); /******************************************* * 收取ASCII码没有问题，直接接收环境监测仪数据时， * 一是包分成多个 * 二是转换格式不对 * 结果是由于波特率设定导致数据格式不正确 *******************************************/ } else { UpdateListBoxText(DateTime.Now.ToString() + " " + "Receive:" + " " + System.Text.Encoding.ASCII.GetString(recb).Substring(0, bufferLen)); } } } } catch (Exception e) { //Console.WriteLine(e.ToString()); UpdateListBoxText("数据接收失败，原因为：" + e); } } } catch (Exception e) { UpdateListBoxText("监听失败，原因为：" + e); } } #endregion