/// <summary>

        /// 提取命令

        /// 格式为两个一位整数拼接成的字符串。

        /// 第一位为0表示客户机向服务器发送的命令，为1表示服务器向客户机发送的命令。

        /// 第二位表示命令的含义，具体如下：

        /// "11"-服务器要求客户机更新在线列表

        /// "12"-服务器要求客户机做闪屏振动

        /// default-接受用户消息或者系统消息的正文

        /// </summary>

        /// <param name="s">要解析的包含命令的byte数组，只提取前两个字节</param>

        /// <returns>拼接成的命令</returns>

        private string DecodingBytes(byte[] s)

        {

            return string.Concat(s[0].ToString(), s[1].ToString());

        }



        /// <summary>

        /// 接受消息的线程执行体

        /// </summary>

        private void ReceiveMsg()

        {



            try

            {

                while (true)

                {

                    byte[] packet = new byte[_maxPacket];

                    _nws.Read(packet, 0, packet.Length);

                    string _cmd = DecodingBytes(packet);



                    switch (_cmd)

                    {

                        /// "11"-服务器要求客户机更新在线列表

                        /// "12"-服务器要求客户机做闪屏振动

                        /// default-接受用户消息或者系统消息的正文

                        case "11":

                            {

                                byte[] onlineBuff = new byte[_maxPacket];

                                int byteCnt = _nws.Read(onlineBuff, 0, onlineBuff.Length);

                                IFormatter format = new BinaryFormatter();

                                MemoryStream stream = new MemoryStream();

                                stream.Write(onlineBuff, 0, byteCnt);

                                stream.Position = 0;

                                StringCollection onlineList = (StringCollection)format.Deserialize(stream);

                                online_cb.Items.Clear();

                                foreach (string onliner in onlineList)

                                {

                                    if (!onliner.Equals(_username))

                                    {

                                        online_cb.Items.Add(onliner);

                                    }

                                }

                                break;

                            }

                        case "12":

                            {

                                Nudge();

                                break;

                            }

                        default:

                            {

                                string displaytxt = Encoding.Unicode.GetString(packet);

                                chatrcd_rtb.AppendText(displaytxt);

                                //消息是空格时好像也会进来。。。怎么处理这里 

                                if (!string.IsNullOrEmpty(displaytxt))

                                {

                                                                            //AlertMsg(displaytxt);

                                        Client.Msg.MsgMain mm = new Client.Msg.MsgMain();

                                        Client.Msg.MsgMain.formClassFullPath = "Client.Mission.TelMissions";

                                        Client.Msg.MsgMain.msgContent = displaytxt.Trim();

                                        mm.Show();

                                        _sp1.Play();

                                }

                                

                                break;

                            }

                    }

                }

            }

            catch (Exception err)

            {

                Clscommonuse.WriteError("接受消息的线程执行体ChatForm-ReceiveMsg()", "ReceiveMsg", err.Source, err.Message);

            }

        }