lyfz_repos/铂金版源码/LYFZ.ServerNetwork/TCP_ProtocolHelperXML.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using LYFZ.Network.EnumerateLibrary;
using System.Xml;
namespace LYFZ.Network
{
    /// <summary>
    /// ProtocolHelper辅助类
    ///这个类专用于将XML格式的协议映射为我们上面定义的强类型对象，这里我没有加入
    ///try/catch异常处理，因为协议对用户来说是不可见的，而且客户端应该总是发送正确的协议
    /// </summary>
    public class TCP_ProtocolHelperXML
    {
        private XmlNode fileNode;
        private XmlNode root;
        /// <summary>
        /// 初始化
        /// </summary>
        /// <param name="protocol">XML格式的协议字符串</param>
        public TCP_ProtocolHelperXML(string protocol)
        {
            if (protocol.Trim().Length > 1)
            {
                XmlDocument doc = new XmlDocument();

                doc.LoadXml(protocol);
                root = doc.DocumentElement;
                fileNode = root.SelectSingleNode("information");
            }
        }
        

        /// <summary>
        /// 获取TCP数据传送类型，是文字信息还是文件，此时的protocal一定为单条完整protocal 
        /// </summary>
        /// <returns></returns>
        private InformationType GetInformationType()
        {
            string mode = fileNode.Attributes["Type"].Value;
            if (mode.ToLower() == "msg")
            {
                return InformationType.Message;
            }
            else if (mode.ToLower() == "file")
            {
                return InformationType.File;
            }
            else
            {
                return (InformationType)Enum.Parse(typeof(InformationType), mode);
            }
        }
        
        /// <summary>
        /// 获取单条协议包含的信息
        /// </summary>
        /// <returns></returns>
        public TCP_FileProtocol GetProtocol()
        {
            try
            {
                //Type=\"{0}\"  ExtraInfo=\"{1}\" ReceiveFileSize=\"{2}\" ClientInfo=\"{3}\" ServerStartTimeStamp=\"{4}\"
                string ExtraInfo = "";
                long receiveFileSize = 0;
                InformationType infoType = GetInformationType();
                string content = "";
                ExtraInfo = LYFZ.WinAPI.SDKSecurity.Decode(fileNode.Attributes["ExtraInfo"].Value);
                try
                {
                    receiveFileSize = Convert.ToInt64(fileNode.Attributes["ReceiveFileSize"].Value);
                }
                catch { }
                content = LYFZ.WinAPI.SDKSecurity.Decode(fileNode.InnerText.Trim());

                string clientInfo = "";
                string serverStartTimeStamp = "";
                try
                {
                     clientInfo = fileNode.Attributes["ClientInfo"].Value;
                     serverStartTimeStamp = fileNode.Attributes["ServerStartTimeStamp"].Value;
                }
                catch { }
                TCP_FileProtocol retProtocol= new TCP_FileProtocol(infoType, content, ExtraInfo, clientInfo);
                retProtocol.ServerStartTimeStamp = serverStartTimeStamp;
                retProtocol.ReceiveFileSize = receiveFileSize;
                return retProtocol;
            }
            catch { return new TCP_FileProtocol(); }
        }
    }
}