C # TCP Socket communication Basics

Socket communication is essential for network communication programs.

Therefore, we need a set of established and simple communication procedures.

As follows:

<Pre name = "code" class = "csharp"> public class PublicSocket {public const string DOWNLOAD_STATUS_WAIT = "1"; public const string DOWNLOAD_STATUS_PAUSE = "2 "; public const string DOWNLOAD_STATUS_DOWNLOADING = "3"; public const string DOWNLOAD_STATUS_DOWNLOADED = "4"; public const string DOWNLOAD_STATUS_ERROR = "5"; // private XmlHelper xmlhelper = new XmlHelper (); private TcpClient tcpMethod = new Tcp Client (); public static string LoginUserName = ""; public static Socket HeadClient = new Socket (AddressFamily. interNetwork, SocketType. stream, ProtocolType. tcp); private static string iAddress = "192.168.1.1"; private static int iPort = 7888; private static IPEndPoint endpoint = new IPEndPoint (IPAddress. parse (iAddress), iPort); public const int LOGIN_NAMEERROR = 100000; public const int LOGIN_CODE ERROR = 100001; public const int LOGIN_ERROR = 100002; public const int LOGIN_ OK = 100003; public static bool AllowUpdate = true; public static void SocketConnect () {try {if (! HeadClient. connected) {HeadClient. connect (endpoint) ;}} catch (Exception ex) {}} public static void SocketClose () {if (HeadClient. connected) {HeadClient. close () ;}} public static void ThreadGetSingleDownloadedFile (object data) // The object parameter can be used to input data on the interface. {string retMD5 = string. empty; try {HanleListItemClass formInter = data as HanleListItemClass; XmlDocument aa = XmlHelper. buildXmlDoc ("CMD ", "1", "1", new List <fig node> {new fig node ("ID", "2", null), new fig node ("STATE", "127 ", null)}); // mainly used to build an XML file and perform the send operation on the Socket. // The structure is as follows <? Xml version = '1. 0' encoding = 'utf-8'?> <CMD code = '1' index = '1'> // <ID> 2 </ID>/<STATE> 127 </STATE> </CMD> byte [] sendaskbyte = Encoding. UTF8.GetBytes (aa. innerXml. toString (); int sendcount = 0; try {sendcount = HeadClient. send (sendaskbyte, sendaskbyte. length, 0);} catch (Exception ex) {// return LOGIN_ERROR;} if (sendcount = 0) {// return LOGIN_ERROR ;} int ret = SingleDownloadedFileWaitBack (formInter);} catch {// return LOGIN_ERROR;} public static int SingleDownloadedFileWaitBack (HanleListItemClass tItemclass) {byte [] RetData = new byte [36*1024]; array. clear (RetData, 0, RetData. length); int datalen = 0; try {datalen = HeadClient. receive (RetData); if (datalen = 0) {return-1;} // receives the information returned by the Server string tcpdatastring = Encoding. UTF8.GetString (RetData ). replace ("\ 0", ""); // here you can handle the returned information http://www.cnblogs.com/sosoft/ return 0;} catch (Exception ex) {return 0 ;}}}

 

Before calling the interface, we only need to use it in the event.

 

 private void button1_Click(object sender, EventArgs e)       {  PublicSocket.SocketConnect();               ThreadPool.QueueUserWorkItem(new WaitCallback(SocketMethod.ThreadGetTotalState), this);       } 

 

At the same time, we also share the classes for Building XML to make the encoding easier.

 

 1 public class XmlHelper 2     { 3         private static string xmlinit = "<?xml version='1.0' encoding='utf-8'?><{0} code='{1}'  index='{2}'></{0}>"; 4  5         public static XmlDocument BuildXmlDoc(string xmltype, string code, string index, List<HollXmlNode> xmlnodes) 6         { 7             XmlDocument root = new XmlDocument(); 8             root.LoadXml(string.Format(xmlinit, xmltype, code, index)); 9 10             if (xmlnodes != null)11             {12                 for (int i = 0; i < xmlnodes.Count; i++)13                 {14                     XmlElement parentNode = root.CreateElement(xmlnodes[i].NodeName);15 16                     XmlText descText = root.CreateTextNode(xmlnodes[i].NodeValue);17                     parentNode.AppendChild(descText);18 19 20                     if (xmlnodes[i].NodeAtt != null)21                     {22                         if (xmlnodes[i].NodeAtt.Count > 0)23                         {24                             for (int j = 0; j < xmlnodes[i].NodeAtt.Count; j++)25                             {26                                 parentNode.SetAttribute(xmlnodes[i].NodeAtt[j].AttName, xmlnodes[i].NodeAtt[j].AttValue);27                             }28                         }29                     }30 31                     root.LastChild.AppendChild(parentNode);32                 }33             }34 35 36             return root;37         }38 39 40     }

 

 

 1 public class HollXmlNode 2     { 3         private string _nodename; 4         private string _nodevalue; 5         private List<HollXmlAttribute> _nodeatt; 6  7  8         public HollXmlNode(string tnodename, string tnodevalue, List<HollXmlAttribute> tnodeatt) 9         {10             _nodename = tnodename;11             _nodevalue = tnodevalue;12             _nodeatt = tnodeatt;13         }14 15 16         public string NodeName17         {18             get { return _nodename; }19             set { _nodename = value; }20         }21 22 23 24 25         public string NodeValue26         {27             get { return _nodevalue; }28             set { _nodevalue = value; }29         }30 31 32         public List<HollXmlAttribute> NodeAtt33         {34             get { return _nodeatt; }35             set { _nodeatt = value; }36         }37     }38 39 40     public class HollXmlAttribute41     {42         private string _attname;43         private string _attvalue;44 45 46         public HollXmlAttribute(string tname, string tvalue)47         {48             _attname = tname;49             _attvalue = tvalue;50         }51 52 53         public string AttName54         {55             get { return _attname; }56             set { _attname = value; }57         }58 59 60         public string AttValue61         {62             get { return _attvalue; }63             set { _attvalue = value; }64         }65     }