求助sharppcap获取数据乱码问题

Question

我仿照Fiddler获取网络的数据。但是在获取数据的时候是乱码如何解决。
var datastr = Encoding.GetEncoding("utf-8").GetString(tcpPacket.PayloadData);求各位大神赐教如何解决。
        #region 监听
        /// <summary>
        /// 监听
        /// </summary>
        private void monitor()
        {
            var devices = LibPcapLiveDeviceList.Instance;
            foreach (PcapDevice dev in devices) {
                if (dev.Interface.FriendlyName.ToString() == selectedAdp) {
                    PcapDevice device = dev;
                    device.OnPacketArrival += new PacketArrivalEventHandler(device_OnPackArrival);
                    device.Open(DeviceMode.Promiscuous, 1000);//监听模式
                    device.StartCapture();//启动扑获
                }
            }
        }
        #endregion#region 接收到包的处理 device_OnPackArrival(object sender, CaptureEventArgs e)
        /// <summary>
        /// 接收到包的处理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void device_OnPackArrival(object sender, CaptureEventArgs e)
        {
            var packet = PacketDotNet.Packet.ParsePacket(e.Packet.LinkLayerType, e.Packet.Data);
            var tcpPacket = PacketDotNet.TcpPacket.GetEncapsulated(packet);            if (tcpPacket != null)
            {
                //乱码乱码乱码
                var datastr = Encoding.GetEncoding("utf-8").GetString(tcpPacket.PayloadData, 0, tcpPacket.PayloadData.Length);
            }
         }
       #endregion

Answer 1

你这个我没搞过。
但是我在抓取网页的时候也遇到过乱码问题。
可以通过识别数据流，分析出你这个是utf8，还是gb2312，还是其他内容。这个是分析：
        #region 判断字节编码类型
        /// <summary>
        /// 获取当前字节流的编码类型
        /// </summary>
        /// <param name="srcBytes"></param>
        /// <returns></returns>
        public static Encoding GetEncoding(this byte[] srcBytes)
        {
            byte[] Unicode = new byte[] { 0xFF, 0xFE, 0x41 };
            byte[] UnicodeBIG = new byte[] { 0xFE, 0xFF, 0x00 };
            byte[] UTF8 = new byte[] { 0xEF, 0xBB, 0xBF }; //带BOM 
            Encoding reVal = Encoding.Default;            if (IsUTF8Bytes(srcBytes) || (srcBytes[0] == 0xEF && srcBytes[1] == 0xBB && srcBytes[2] == 0xBF))
            {
                reVal = Encoding.UTF8;
            }
            else if (srcBytes[0] == 0xFE && srcBytes[1] == 0xFF && srcBytes[2] == 0x00)
            {
                reVal = Encoding.BigEndianUnicode;
            }
            else if (srcBytes[0] == 0xFF && srcBytes[1] == 0xFE && srcBytes[2] == 0x41)
            {
                reVal = Encoding.Unicode;
            }
            return reVal;
        }
        /// <summary> 
        /// 判断是否是不带 BOM 的 UTF8 格式 
        /// </summary> 
        /// <param name=“data“></param> 
        /// <returns></returns> 
        private static bool IsUTF8Bytes(byte[] data)
        {
            int charByteCounter = 1; //计算当前正分析的字符应还有的字节数 
            byte curByte; //当前分析的字节. 
            for (int i = 0; i < data.Length; i++)
            {
                curByte = data[i];
                if (charByteCounter == 1)
                {
                    if (curByte >= 0x80)
                    {
                        //判断当前 
                        while (((curByte <<= 1) & 0x80) != 0)
                        {
                            charByteCounter++;
                        }
                        //标记位首位若为非0 则至少以2个1开始 如:110XXXXX...........1111110X 
                        if (charByteCounter == 1 || charByteCounter > 6)
                        {
                            return false;
                        }
                    }
                }
                else
                {
                    //若是UTF-8 此时第一位必须为1 
                    if ((curByte & 0xC0) != 0x80)
                    {
                        return false;
                    }
                    charByteCounter--;
                }
            }
            if (charByteCounter > 1)
            {
                throw new Exception("非预期的byte格式");
            }
            return true;
        }
        #endregion

Answer 2

感谢@张天星 今天我又运行了一下程序发现又不乱码了，我什么地方都没改啊！看来我还是对于SharpPcap不太熟悉，它怎么这么不稳定，有时候乱码，有时候不乱码啊！

Answer 3

有谁更了解SharpPcap它为什么会乱码？