一起来打造个正版音乐下载器(二)(三）

    这是一起来打造个正版音乐下载器(一)的续集...

现在说的是分析HTML和采集网页指定的内容....

经过分析HTML可以知道巨鲸网每首音乐都有个ID，根据这个ID就能下载到每个音乐了。。光用说的比较抽象...看具体例子把

    <ul class="clear"> 
            <li class="gq_a">1.</li> 
            <li class="gq_b"><input type="checkbox" id='Song1' value='M0314784001' SongID='3440992'  SongName='这叫爱'></li> 
            <li class="gq_c"><a href='http://www.top100.cn/Product/product.aspx?ProductID=M0314784001' target="_blank">这叫爱</a></li> 
            <li class="gq_d"> 
            <a href=http://www.top100.cn/Product/singer.aspx?singerID=55633  class="a2" target=_blank><font style='color:#ff0000;background-color:yellow'>BY2</font></a>&nbsp;
            </li> 
            <li class="gq_d"><a href='http://www.top100.cn/Product/product.aspx?ProductID=S0314784000' target="_blank">单曲 - 这叫爱</a></li> 
            <li class="gq_e">0:03:29</li> 
            <li class="gq_f"><a href='#' onclick='javascript:play("http://www.top100.cn/Audition/Play.htm?Productid=M0314784001")'><img src="http://image.top100.cn/webImg/button_listen.jpg" /></a></li> 
            <li class="gq_g"><a href='http://www.top100.cn/Payment/cart.aspx?Productid=M0314784001' target="_blank"><img src="http://www.top100.cn/Images/button_Buy.jpg" /></a></li> 
            <li class="gq_h"><a href="http://wlyy.mcprc.gov.cn/Admin/ComSelect.aspx" target =_blank ></a></li> 
            </ul> <br clear="all"> 

从上面我们就能写出正则表达式，而我搜索BY2网页地址是：http://search.top100.cn/searchdefault.aspx?keyword=by2

不难看出http://search.top100.cn/searchdefault.aspx?keyword=《搜索关键字》

原理大概就是这样......我还是贴出代码来给大家看吧

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.Text.RegularExpressions;
using System.Net;
using System.Threading;
using System.Diagnostics;
using System.IO;

namespace iMusic
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }



        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text.Trim() == "")
            {
                MessageBox.Show("请输入要查询的歌名");
            }
            else
            {
                listBox1.Items.Clear();
                listID.Clear();
                Thread s = new Thread(sss);
                s.Start();
            }
        }

        List<string> listID = new List<string>();
        public void sss()
        {
            WebClient client = new WebClient();
            byte[] page = client.DownloadData("http://search.top100.cn/searchdefault.aspx?keyword=" + textBox1.Text);
            string content = System.Text.Encoding.UTF8.GetString(page);
           
            string regex = "<li class=\"gq_b\"><input type=\"checkbox\" id='.*' value='.*' SongID='.*'  SongName='.*'>";
            Regex re = new Regex(regex);
            MatchCollection matches = re.Matches(content);
         
            System.Collections.IEnumerator enu = matches.GetEnumerator();
            while (enu.MoveNext() && enu.Current != null)
            {
                Match match = (Match)(enu.Current);
         
                 
                    listID.Add(match.Value.Substring(match.Value.IndexOf("M"), 11));
                    listBox1.Items.Add(match.Value.Substring(match.Value.LastIndexOf("=") + 2, match.Value.LastIndexOf(">") - match.Value.LastIndexOf("=") - 3));
                   
              
          
            }
            MessageBox.Show("查找完成，如果没有找到请换个关键词尝试");
 
        }
       string fileName="";
       private void button2_Click(object sender, EventArgs e)
       {
           if (listBox1.SelectedItems.Count < 1)
           {
               MessageBox.Show("没有选中的歌曲");
           }
           else
           {

            
                   //web地址全名
                   string remoteUri = "http://www.top100.cn/Payment/ds.aspx?Productid=" + listID[listBox1.SelectedIndex].ToString();
                   //输入下载的文件名称
                   fileName = listBox1.Items[listBox1.SelectedIndex].ToString() + ".mp3";
                   //创建WebClient实例
                   WebClient myWebClient = new WebClient();
                   Uri uri = new Uri(remoteUri);
                   //绑定下载事件，以便于显示当前进度
                   myWebClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(OnDownloadProgressChanged);
                   //绑定下载完成事件，以便于计算总进度
                   myWebClient.DownloadFileCompleted += new AsyncCompletedEventHandler(OnDownloadFileCompleted);

                   // 下载保存文件到程序运行目录下
                   myWebClient.DownloadFileAsync(uri, Path.Combine(AppDomain.CurrentDomain.BaseDirectory + "Temp", fileName));


       
           }
       }
    

            
     
        private void OnDownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
    

            progressBar1.Value = e.ProgressPercentage;
            label1.Text = "已下载" + e.BytesReceived + "字节/总计" + e.TotalBytesToReceive + "字节";//一个label框，用来显示当前下载的数据
        }

        private void OnDownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
        {
 
            if (MessageBox.Show("下载完成，是否打开文件", "提示", MessageBoxButtons.YesNo) == DialogResult.Yes)
            {
                // 打开文件
                Process myProcess = new Process();

                myProcess.StartInfo.FileName = Application.StartupPath + "\\temp\\" + fileName;
                myProcess.StartInfo.Verb = "Open";
                myProcess.StartInfo.CreateNoWindow = true;
                myProcess.Start();
            }
            progressBar1.Value = 0;
        }




    }
}

完整的代码就是上面那个样子...有什么不懂的可以留言...