winform采撷网站美女图片程序-多线程篇

  1 #region 全局变量
  2         //线程列表
  3         List<Thread> threadslList = new List<Thread>();
  4         //Url列表
  5         List<string> uUrls = new List<string>();
  6         //处理完毕的列表
  7         List<string> OkUrls = new List<string>();
  8         //成功取得的美女图片数量 
  9         public int ImgCount = 0;
 10 #endregion
 11 
 12 
 13 //取图开始 按钮事件
 14  private void lbtnGetWebImgStart_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
 15         {
 16             lbtnGetWebImgStart.Enabled = false;
 17             GetWebSiteImg();
 18         }
 19 
 20 //取图停止 按钮事件
 21         private void lbtnGetWebImgStop_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
 22         {
 23             try
 24             {
 25                 foreach (Thread t in threadslList)
 26                 {
 27                     if (t != null)
 28                     {
 29                         t.Abort();
 30                     }
 31                 }
 32             }
 33             catch (Exception ex)
 34             {
 35                 WriteLog("停止失败:" + ex.Message);
 36             }
 37             finally
 38             {
 39                 lbtnGetWebImgStart.Enabled = true;
 40             }
 41         }
 42 
 43         /// <summary>
 44         /// 获取图片主方法
 45         /// </summary>
 46         private void GetWebSiteImg()
 47         {
 48             try
 49             {
 50                 ImgCount = 0;
 51                 OkUrls.Clear();
 52                 uUrls.Clear();
 53                 threadslList.Clear(); //先初始化以上
 54                 string[] urls = txtUrl.Text.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries); 
 55                 lblC.Text = urls.Length.ToString(CultureInfo.InvariantCulture);
 56                 uUrls = new List<string>(urls);
 57                 for (int i = 0; i < int.Parse(numThreadUD.Text); i++) // 循环创建线程
 58                 {
 59                     Thread t = new Thread(Task);
 60                     t.Name = i.ToString();
 61                     t.IsBackground = true;
 62                     threadslList.Add(t);
 63                     t.Start();
 64                 } 
 65             }
 66             catch (Exception ex)
 67             {
 68                 WriteLog(ex.Message);
 69             } 
 70         }
 71 
 72 
 73    public void Task()
 74         {
 75             while (uUrls.Count > 0)
 76             {
 77                 lblMsg.Text = string.Format("剩余：{0}，已访问：{1}，当前线程数：{2}", uUrls.Count, (OkUrls.Count + 1), threadslList.Count);
 78                 string url = GetUrl();
 79                 if (url == "")
 80                 {
 81                     break;
 82                 }
 83                 else
 84                 {
 85                     if (GetHttpImg(url) == 200)//只有状态200才是正常的, GetHttpImg是我封装的方法, 获取网页, 正则取得所有合规范的图片. 
 86                     {
 87                         OkUrls.Add(url);
 88                         lblInfoStart.Text = (int.Parse(lblInfoStart.Text) + 1).ToString(CultureInfo.InvariantCulture);
 89                         WriteHtml(txtUrl.Text);
 90                         if (lblC.Text == lblInfoStart.Text)//判断当前数量是否已是总数. 
 91                         {
 92                             lblMsg.Text = "完成";
 93                         }
 94                     }
 95                 }
 96             }
 97         }
 98     
 99 
100         /// <summary>
101         /// 线程加锁，防止多个线程同时从list里面取出第一个
102         /// </summary>
103         /// <returns></returns>
104         public string GetUrl()
105         {
106             lock ("GetUrl")
107             {
108                 if (uUrls.Count > 0)
109                 {
110                     string url = uUrls[0];
111                     uUrls.RemoveAt(0);
112                     return url;
113                 }
114                 else
115                 {
116                     return "";
117                 }
118             }
119         }