ox17

Question

问题一：
  public void AddSession(string strSessionName, string strValue)
        {
            HttpContext.Current.Session[strSessionName] = strValue;
            HttpContext.Current.Session.Timeout = 0x17;
        }
0x17表示的是十六进制。这里表示的是时间。不多见
问题二。
 public static string qcreplace(string dd, int x)
        {
            string str = "eljqpjmnpoaz";
            if (x == 2)
            {
                str = "qvchjdsyhpok";
            }
            int length = str.Length;
            int num2 = 0;
            int startIndex = 0;
            int num4 = 0;
            int num5 = 0;
            string str2 = "";
            int num7 = Convert.ToInt32(Convert.ToString(Convert.ToInt32(dd.Substring(0, 1), 0x10), 10));
            for (startIndex = 2; startIndex < dd.Length; startIndex += 2)
            {
                num4 = Convert.ToInt32(Convert.ToString(Convert.ToInt32(dd.Substring(startIndex, 2), 0x10), 10));
                if (num2 < length)
                {
                    num2++;
                }
                else
                {
                    num2 = 1;
                }
                char ch1 = str[num2 - 1];
                num5 = num4 ^ str[num2 - 1];
                if (num5 <= num7)
                {
                    num5 = (0xff + num5) - num7;
                }
                else
                {
                    num5 -= num7;
                }
                str2 = str2 + ((char) num5);
                num7 = num4;
            }
            return str2;
        }  int num7 = Convert.ToInt32(Convert.ToString(Convert.ToInt32(dd.Substring(0, 1), 0x10), 10))；？这个用好吗，郁闷我用vs2008跟踪下得到的结果是182.110,27.56，我想得到127.0.0.1 应该把代码改为什么了？

Answer 1

 public static string qcplace(string bb)
        {
            string str = "eljqpjmnpoaz";
            int length = str.Length;
            string str2 = "FF";
            int num7 = 0;
            int num2 = 0;
            for (int i = 0; i < bb.Length; i++)
            {
                num7 = Convert.ToInt32(str2.Substring(i * 2, 2), 16);
                int num5 = (int)bb[i];
                num5 = num5 + num7;
                if (num5 >= 0xff)
                {
                    num5 = num5 - 0xff;
                }
                if (i > length)
                    num2 = num5 ^ str[0];
                else
                    num2 = num5 ^ str[i];                string str3 = Convert.ToString(num2, 0x10);
                if (str3.Length < 2)
                    str3 = "0" + str3;
                str2 = str2 + str3;
            }
            return str2;
        }