socket中的byte消息格式设计

using  System;
using  System.Text;

namespace  byteStudy
{
     class  Program
    {
         static   void  Main( string [] args)
        {
             string  msg  =   " ^txt^jimmy^Hello^ " ; // 格式：^类型^用户名^内容(或文件流)^

             byte [] b  =  UTF32Encoding.UTF8.GetBytes(msg); // 模拟接收到的byte数组

             int  _i1  =   - 1 , _i2  =   - 1 , _i3  =   - 1 , _i4  =   - 1 ; // 用来记录分隔字符“^”出现的四次位置

             for  ( int  i  =   0 ; i  <  b.Length; i ++ )
            {
                 if  (b[i]  ==  ( byte ) ' ^ ' )
                {
                     if  (_i1  ==   - 1 )
                    {
                        _i1  =  i;
                    }
                     else   if  (_i2  ==   - 1 )
                    {
                        _i2  =  i;
                    }
                     else   if  (_i3  ==   - 1 )
                    {
                        _i3  =  i;
                    }
                     else   if  (_i4  ==   - 1 )
                    {
                        _i4  =  i;
                    }
                }
                Console.WriteLine(b[i].ToString());
            }


            Console.WriteLine( " ------------------------------- " );

             if  (_i1  ==   0   &&  _i4  ==  b.Length  -   1   &&  _i3  !=   - 1   &&  _i2  !=   - 1 )
            {
                Console.WriteLine( " _i1={0} " , _i1);
                Console.WriteLine( " _i2={0} " , _i2);
                Console.WriteLine( " _i3={0} " , _i3);
                Console.WriteLine( " _i4={0} " , _i4);

                 byte [] bFlag  =   new   byte [_i2  -  _i1  -   1 ];

                 for  ( int  i  =  _i1  +   1 ; i  <  _i2; i ++ )
                {
                    bFlag[i  -  _i1  -   1 ]  =  b[i];
                }

                 string  _flag  =  UTF32Encoding.UTF8.GetString(bFlag);

                 byte [] bName  =   new   byte [_i3  -  _i2  -   1 ];

                 for  ( int  i  =  _i2  +   1 ; i  <  _i3; i ++ )
                {
                    bName[i  -  _i2  -   1 ]  =  b[i];
                }

                 string  _name  =  UTF32Encoding.UTF8.GetString(bName);


                 byte [] bContent  =   new   byte [_i4  -  _i3  -   1 ];

                 for  ( int  i  =  _i3  +   1 ; i  <  _i4; i ++ )
                {
                    bContent[i  -  _i3  -   1 ]  =  b[i];
                }

                 string  _content  =  UTF32Encoding.UTF8.GetString(bContent); // 如果是文件的话，用其它办法还原成流，近而变成文件或图片

                Console.WriteLine( " ------------------------------- " );
                Console.WriteLine( " 类型： "   +  _flag);
                Console.WriteLine( " 用户： "   +  _name);
                Console.WriteLine( " 内容： "   +  _content);
            }
            Console.Read();
        }
    }
}