/// 
///  获取四位数的数字得到数据长度/// 
/// 
    
     /// 
     private int byte2Int(byte[] b){    return ((b[0] & 0xff) << 24) | ((b[1] & 0xff) << 16)            | ((b[2] & 0xff) << 8) | (b[3] & 0xff);}/// 
     
/// 把数据长度转换为二进制/// 
/// 
     
      /// 
      private byte[] int2Byte(int a){    byte[] b = new byte[4];    b[0] = (byte)(a >> 24);    b[1] = (byte)(a >> 16);    b[2] = (byte)(a >> 8);    b[3] = (byte)(a);    return b;}/// 
      
/// 读取Socket的数据/// 
/// 
      
       /// 
       
        /// 
        private void readSocketData(String ip,int port,String requestData){    try    {        IPAddress ipAddress = IPAddress.Parse(ip);        Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);        clientSocket.ReceiveTimeout = 5000;        clientSocket.SendTimeout = 5000;        clientSocket.Connect(new IPEndPoint(ipAddress, port));        Task
        
          readRes = Task.Factory.StartNew
         
          (() =>        {            byte[] result = new byte[40960];            clientSocket.Receive(result);            int receiveLength = byte2Int(result);            String response = Encoding.UTF8.GetString(result, headLength, receiveLength);            return response;        });        byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(requestData);        int length = byteArray.Length;        byte[] lenBytes = int2Byte(length);        byte[] newBytes = new byte[lenBytes.Length + length];        lenBytes.CopyTo(newBytes, 0);        byteArray.CopyTo(newBytes, lenBytes.Length);        clientSocket.Send(newBytes);        string resultStr = readRes.Result;        MessageBox.Show(resultStr, "Socket Result", MessageBoxButtons.OK, MessageBoxIcon.Error);    }    catch (Exception ex)    {        MessageBox.Show("Socket connect fail.\r\n" + ex.Message, "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error);    }    finally    {        this.btn_submit.Enabled = true;    }}