图书馆自动答题机器人

百度贴个代码都不方便 ，更諻论添加附件了
搬cnblogs了（囧，cnblogs开通博客还要申请）

因为图书馆迟还书要做题，故用C#写了个自动答题的软件，10秒钟答完
之所以用C#，因为C#封装了许多高级类，用来做与网络相关的程序非常方便

1.抓包分析
第一步先提交卡号，会返回一个做题的页面，

尝试做一道题，用fiddler2分析发现其提交了UserName,PayListId,RightCount,ErrorCount，QuestionCount,RepeatTimes,FinishedQuestionId,QuestionID,Answer等数据,查看网页源代码，发现其用一个hidden属性的input隐性提交的，UserName是校园卡号，Answer是答案，其他也不难推测。
2.编码
用C#最大的好处就是可以用它封装好的HttpWebRequest类HttpWebResponse类实现模拟浏览器的操作
（参考使用 HttpWebRequest 向网站提交数据）
3.注意的问题：
编码中有一个问题就是回答问题错误过半数它的RepeatTimes会加1，要求重新开始答题，如果三次答题不通过再提示重新开始。
因此有必要提高我们再题的准确性，基于此，开辟一个Directory<string,string>的对象，存储题号和答案，在开始答题前从answers.txt读入题目与答案，如果某个问题有记录再采取它的答案，否则随机生成一个答案，回答下一题之前判断这个答案是否正确，若正确则存入Directory对象中，否则排除，最后答题完毕再把Directory写入answers.txt,越后越能提高答题准确性。

虽然只限中大图书馆，但网络编程的流程大致如上

代码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Web;
using System.IO;
using System.Collections.Generic;
using System.Threading;

namespace LIBROBOT
{

    public partial class FormMain : Form
    {

        public FormMain()
        {
            InitializeComponent();
           //CardNum.Text = "0000312121";
           //CardNum.Text = "0000322618";
        }

        private void StartBtn_Click(object sender, EventArgs e)
        {
           String cardnum=CardNum.Text;
           if (cardnum.Trim().Length != 10) {
               MessageBox.Show("请输入10位证件号！");
               return;
           }

           UserName = cardnum;

           Init();
           if (RightCount == null || ErrorCount == null || QuestionCount == null)
           {
               MessageBox.Show("您无过期记录！");
               return;
           }
           while (!AnswerQuestion())
           {
               lblStatus.Text = "答错:"+ErrorCount+"道,答对:"+RightCount+"道";  
           }
           

        }

        private void ReadAnswers() {
            RightAnswers=new Dictionary<string,string>();
            StreamReader sr;
            try { 
                sr=File.OpenText("answers.txt");
                sr.ReadLine();
                while (sr.Peek() != -1)
                {
                    String str = sr.ReadLine();
                   
                    string q=str.Split(':')[0];
                    string a=str.Split(':')[1];
                    RightAnswers.Add(q, a);
                }
                sr.Close();
            }catch(Exception e){
                //MessageBox.Show(e.Message);
            }
            
        }
        private void WriteAnswers() {
           
            StreamWriter sw;
            sw = File.CreateText("answers.txt");
            foreach(var item in RightAnswers.Keys)
            {
                sw.WriteLine(item + ":" + RightAnswers[item]);
                
            }
            sw.Flush();
            sw.Close();
            //StreamWriter sw;
        }
        private String GetAnswer(String QID) {
            if (!RightAnswers.ContainsKey(QID))
                return "1";

            return RightAnswers[QID];

        }
        private bool AnswerQuestion() {


            Thread.Sleep(10);
            if (QuestionID == null) {
                WriteAnswers();
                MessageBox.Show("机器人学习失败导致三次未通过");
                return true;
            }
            
                Answer=GetAnswer(QuestionID);

            string param = "UserName=" + UserName + "&PayListId=" + PayListId 
                        + "&RightCount=" + RightCount + "&ErrorCount=" + ErrorCount 
                        + "&QuestionCount=" + QuestionCount + "&RepeatTimes=" + RepeatTimes 
                        + "&FinishedQuestionId="  + FinishedQuestionId + "&QuestionID=" + QuestionID 
                        + "&Answer=" + Answer;
            byte[] bs = Encoding.ASCII.GetBytes(param);

            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("http://202.116.65.77:8001/sysulib/html/LibEducateSystem.do?Command=CheckAnswer");
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            req.ContentLength = bs.Length;

            using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(bs, 0, bs.Length);
            }

            HttpWebResponse res = (HttpWebResponse)req.GetResponse();
            
            //在这里对接收到的页面内容进行处理  
            if (res.StatusCode != HttpStatusCode.OK)
            {
                MessageBox.Show("页面出错！");
                return true;
            }
            Stream resStream = res.GetResponseStream();
            StreamReader streamReader = new StreamReader(resStream, Encoding.UTF8);
            // streamReader = new StreamReader(resStream, Encoding.Default);
            String htmlCont = streamReader.ReadToEnd();
            streamReader.Close();

            res.Close();

            

            if(htmlCont.IndexOf("完成时间")!=-1){
                WriteAnswers();
                MessageBox.Show("答题完毕！");
                return true;
            }
            Parser(htmlCont, false);
            return false;

        }

        private void Init()
        {

            ReadAnswers();
            string param = "userName=" + UserName + "&x=49&y=19";//x,y不明所以
            byte[] bs = Encoding.ASCII.GetBytes(param);

            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("http://202.116.65.77:8001/sysulib/html/LibEducateSystem.do?Command=CheckUserStatus");
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            req.ContentLength = bs.Length;

            using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(bs, 0, bs.Length);
            }

            HttpWebResponse res = (HttpWebResponse)req.GetResponse();


            //在这里对接收到的页面内容进行处理  
            if (res.StatusCode != HttpStatusCode.OK)
            {
                MessageBox.Show("页面出错！");
                return;
            }
            Stream resStream = res.GetResponseStream();
            StreamReader streamReader = new StreamReader(resStream, Encoding.UTF8);
            // streamReader = new StreamReader(resStream, Encoding.Default);
            String htmlCont = streamReader.ReadToEnd();
            streamReader.Close();

            //分析


            Parser(htmlCont,true);

            res.Close();

        }

        private void Parser(String htmlCont,bool isInit)
        {

            if (!isInit)
            {
                if ((htmlCont.IndexOf("#FF0000") != -1) || htmlCont.IndexOf("#ff0000") != -1)
                {
                    if (Answer == "1") Answer = "2";
                    else Answer = "1";

                }
                if (!RightAnswers.ContainsKey(QuestionID)) {
                    RightAnswers.Add(QuestionID, Answer);
                }
        
            }
            


            int ptr = htmlCont.IndexOf("PayListId");
            if (ptr < 0) 
                return;
            htmlCont = htmlCont.Substring(ptr, 700);
            htmlCont = htmlCont.Substring(18, htmlCont.Length - 18);
            PayListId = htmlCont.Substring(0, htmlCont.IndexOf("\""));

            //"PayListId\" value=\"35649\" />\n\t\t"    
            ptr = htmlCont.IndexOf("RightCount");
            if (ptr < 0) return; 
            htmlCont = htmlCont.Substring(ptr, htmlCont.Length - ptr);
            htmlCont = htmlCont.Substring(19, htmlCont.Length - 19);
            RightCount = htmlCont.Substring(0, htmlCont.IndexOf("\""));

            ptr = htmlCont.IndexOf("ErrorCount");
            if (ptr < 0) return; 
            htmlCont = htmlCont.Substring(ptr, htmlCont.Length - ptr);
            htmlCont = htmlCont.Substring(19, htmlCont.Length - 19);
            ErrorCount = htmlCont.Substring(0, htmlCont.IndexOf("\""));

            ptr = htmlCont.IndexOf("QuestionCount");
            if (ptr < 0) return; 
            htmlCont = htmlCont.Substring(ptr, htmlCont.Length - ptr);
            htmlCont = htmlCont.Substring(22, htmlCont.Length - 22);
            QuestionCount = htmlCont.Substring(0, htmlCont.IndexOf("\""));

            ptr = htmlCont.IndexOf("RepeatTimes");
            if (ptr < 0) return; 
            htmlCont = htmlCont.Substring(ptr, htmlCont.Length - ptr);
            htmlCont = htmlCont.Substring(20, htmlCont.Length - 20);
            RepeatTimes = htmlCont.Substring(0, htmlCont.IndexOf("\""));

            ptr = htmlCont.IndexOf("FinishedQuestionId");
            if (ptr < 0) return; 
            htmlCont = htmlCont.Substring(ptr, htmlCont.Length - ptr);
            htmlCont = htmlCont.Substring(27, htmlCont.Length - 27);
            FinishedQuestionId = htmlCont.Substring(0, htmlCont.IndexOf("\""));

            

            ptr = htmlCont.IndexOf("QuestionID");
            if (ptr < 0) return; 
            htmlCont = htmlCont.Substring(ptr, htmlCont.Length - ptr);
            htmlCont = htmlCont.Substring(19, htmlCont.Length - 19);
            QuestionID = htmlCont.Substring(0, htmlCont.IndexOf("\""));

       
           
                
        }

        private String UserName;
        private String PayListId;
        private String RightCount;
        private String ErrorCount;
        private String QuestionCount;
        private String RepeatTimes;
        private String FinishedQuestionId;
        private String QuestionID;
        private String Answer;
        private Dictionary<string,string> RightAnswers;//存储正确答案的临时变量
    }
}