用小端模式的TcpHelper类

用TCP协议处理分包、粘包是比较麻烦的，所以写了Helper类，完整代码如下：

    public class TcpHelper
    {
        #region TCP模块

        byte[] result = new byte[1024 * 1024];      //接收1M的数据
        Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        //static string ipAddress = ConfigurationInfo_Client.Api;
        //int port = Convert.ToInt32(ConfigurationInfo_Client.Port);
        static string ipAddress = "192.168.123.31";
        int port = Convert.ToInt32("19219");
        IPAddress ip = IPAddress.Parse(ipAddress);
        string message2 = "1001{\"code\":\"" + "123456" + "\"}";

        /// <summary>
        /// 初始化TCP协议方法（首先登录)
        /// </summary>
        public void tcp()
        {
            try
            {
                if (clientSocket.Connected)
                {
                    //clientSocket.Send(getSendByte(message2));
                    //string rec = tcpReceive();   //发送了登录信息后，要接收一下数据
                }
                else
                {
                    clientSocket.Connect(new IPEndPoint(ip, port));
                    clientSocket.Send(getSendByte(message2));
                    string rec = tcpReceive();   //发送了登录信息后，要接收一下数据
                }
            }
            catch (Exception e)
            {
                //MessageBox.Show(e.ToString());
            }
        }

        /// <summary>
        /// 使用TCP发送消息
        /// </summary>
        /// <param name="mess"></param>
        public void tcpSendMessage(string mess)
        {
            try
            {
                if (clientSocket.Connected)
                {
                    clientSocket.Send(getSendByte(mess));
                }
                else
                {
                    //没有登录那就先登录
                    clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                    clientSocket.Connect(new IPEndPoint(ip, 9527));

                    if (clientSocket.Connected)
                    {
                        clientSocket.Send(getSendByte(message2));
                        string str = tcpReceive();   //发送了登录信息后，要接收一下数据
                        clientSocket.Send(getSendByte(mess));
                    }
                }
            }
            catch (Exception e)
            {

            }
        }

        /// <summary>
        /// 计算发送端的字节长度
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public byte[] getSendByte(string str)
        {
            byte[] a = Encoding.UTF8.GetBytes(str);
            int aa = a.Length;

            byte b3 = (byte)((aa >> 24) & 0xff);
            byte b2 = (byte)((aa >> 16) & 0xff);
            byte b1 = (byte)((aa >> 8) & 0xff);
            byte b0 = (byte)(aa & 0xff);
            byte[] req = new byte[aa + 4];
            req[0] = b0;
            req[1] = b1;
            req[2] = b2;
            req[3] = b3;
            System.Array.Copy(a, 0, req, 4, aa);
            return req;
        }

        /// <summary>
        /// 计算接收的字节长度
        /// </summary>
        /// <param name="by"></param>
        /// <returns></returns>
        public int getLen(byte[] by)
        {
            int length = 0;
            length += ((by[0]) & 0xff);
            length += ((by[1] & 0xff) << 8);
            length += ((by[2] & 0xff) << 16);
            length += ((by[3] & 0xff) << 24);
            return length;
        }

        /// <summary>
        /// 接收消息
        /// </summary>
        /// <returns></returns>
        public string tcpReceive()
        {
            try
            {
                if (clientSocket.Connected)
                {
                    clientSocket.ReceiveTimeout = 3000;         //三秒超时

                    //这里进行循环读取
                    int num = clientSocket.Receive(result);
                    int strLen = getLen(result);
                    string str = Encoding.UTF8.GetString(result, 4, strLen);   //这里报错

                    if (!string.IsNullOrWhiteSpace(str))
                    {
                        return str;
                    }
                }
                else
                {
                    tcp();
                }
                return "";
            }
            catch (Exception e)
            {
                return "出现异常";
            }
        }

        #endregion
    }

 

登录是我的项目特有的逻辑，不需要的朋友可以删掉或者不用，其他的发送和接收消息是根据小端模式来进行，亲测好用。