1 using System;
 2 using System.Collections.Generic;
 3 using System.ComponentModel;
 4 using System.Data;
 5 using System.Drawing;
 6 using System.IO;
 7 using System.Linq;
 8 using System.Net;
 9 using System.Text;
10 using System.Text.RegularExpressions;
11 using System.Threading.Tasks;
12 using System.Windows.Forms;
13
14 namespace DownLoader
15 {
16     public partial class Form1 : Form
17     {
18         public Form1()
19         {
20             InitializeComponent();
21         }
22         string cookie = null;
23         private void btnGetCode_Click(object sender, EventArgs e)
24         {
25             WebClient wc = new WebClient();
26             Uri url = new Uri("http://www.ctdisk.com/randcodeV2.php");
27             //获取验证码图片byte[]数据
28             var codedata = wc.DownloadData(url);
29             //转换成内存流
30             MemoryStream ms = new MemoryStream(codedata);
31             //通过内存流创建图片并显示到PictureBox上
32             pictureBox1.Image = Image.FromStream(ms);
33             //从WebClient的ResponseHeaders中获取验证码Session ID的Cookie
34             cookie = wc.ResponseHeaders.Get("Set-Cookie");
35         }
36
37         private void btnGetSource_Click(object sender, EventArgs e)
38         {
39             WebClient wc = new WebClient();
40             wc.Encoding = Encoding.UTF8;
41             Uri surl = new Uri("http://www.ctdisk.com/file/"+txtFileId.Text.Trim());
42             string html = wc.DownloadString(surl);
43             //先获取资源文件的hash_id,这个在验证时也会使用。hash_id与文件不对应,居然报的是验证码错误！呵呵！
44             string hash_id = Regex.Match(html,@"<input type=""hidden"" id=""hash_id"" name=""hash_id"" value=""(.+)""/>").Groups[1].Value;
45             Uri url = new Uri("http://www.ctdisk.com/guest_loginV2.php");
46             //Post提交数据必须的头
47             wc.Headers.Add("Content-Type: application/x-www-form-urlencoded");
48             wc.Headers.Add("Cookie:" + cookie);
49             //Post提交的数据
50             string poststr =
51                 String.Format(
52                 "file_id={0}&hash_id={1}&randcode={2}&Comfirm.x=153&Comfirm.y=20",
53                 txtFileId.Text.Trim(),hash_id, txtCode.Text.Trim());
54             //把Post提交数据转换成byte[]
55             byte[] postdata = Encoding.UTF8.GetBytes(poststr);
56             //Post提交数据并取得返回结果
57             string strhtml = Encoding.UTF8.GetString(wc.UploadData(url, "POST", postdata));
58             //对返回的数据进行处理
59             if (strhtml.Contains("验证码输入错误"))
60             {
61                 txtMsg.Text = "验证码错误或已失效!请从新输入！";
62                 this.btnGetCode_Click(sender,e);
63             }
64             else
65             {
66                 //正则匹配出资源文件下载地址
67                 Match m = Regex.Match(strhtml, @"thunderHref=""(thunder://.+)""");
68                 if (m.Length!=0)
69                 {
70                     txtMsg.Text = m.Groups[1].Value;
71                 }
72                 else
73                 {
74                     txtMsg.Text = "获取资源地址出错！请稍后重试！\r\n"+strhtml;
75                 }
76             }
77         }
78     }
79 }