winform WebBrowser 文件下载拦截 获取文件本地保存路径

这里需要引用 Interop.SHDocVw.dll

  1 public partial class WebBrowserForm : Form

  2     {

  3         WebClient client;

  4         SHDocVw.WebBrowser wb;

  5         private delegate bool IncreaseHandle(int nValue);

  6         //进度条窗口

  7         private ProcessBar myProcessBar = null;

  8         //声明委托对象

  9         private IncreaseHandle myIncrease = null;

 10 

 11         public WebBrowserForm()

 12         {

 13             InitializeComponent();

 14             wb = this.webBrowser1.ActiveXInstance as SHDocVw.WebBrowser;

 15             wb.FileDownload += new SHDocVw.DWebBrowserEvents2_FileDownloadEventHandler(wb_FileDownload);

 16             wb.NewWindow2 += new SHDocVw.DWebBrowserEvents2_NewWindow2EventHandler(wb_NewWindow2);

 17         }

 18 

 19         private void btnShow_Click(object sender, EventArgs e)

 20         {

 21             try

 22             {

 23                 if (!String.IsNullOrEmpty(txtUrl.Text.Trim()))

 24                 {

 25                     Uri url = new Uri(txtUrl.Text.Trim());

 26                     webBrowser1.Url = url;

 27                 }

 28             }

 29             catch (Exception ex)

 30             {

 31                 MessageBox.Show(ex.Message);

 32             }

 33         }

 34         private void wb_FileDownload(bool ActiveDocument, ref bool Cancel)

 35         {

 36             MessageBox.Show("下载开始");

 37             client = new WebClient();

 38             var url = wb.Document.ActiveElement.GetAttribute("href");

 39             //判断是否为下载

 40             if (UrlFilter(url))

 41             {

 42                 SaveFileDialog save = new SaveFileDialog();

 43                 //save.InitialDirectory = Application.ExecutablePath;

 44                 save.Filter = "All Files(*.*)|*.*";

 45                 save.Title = "下载全文";

 46                 save.OverwritePrompt = true;

 47                 save.RestoreDirectory = true;

 48                 save.ValidateNames = true;

 49                 save.CheckPathExists = true;

 50                 save.AddExtension = true;

 51                 String fOldName = url.Split('/')[url.Split('/').Length - 1];

 52                 if (!String.IsNullOrEmpty(fOldName))

 53                 {

 54                     save.FileName = fOldName;

 55                 }

 56                 if (save.ShowDialog() == DialogResult.OK)

 57                 {

 58                     //使用线程起动

 59                     Thread thdSub = new Thread(new ThreadStart(ThreadFun));

 60                     thdSub.Start();

 61 

 62                     client.DownloadFile(url, save.FileName);

 63                 }

 64                 MessageBox.Show(save.FileName);

 65                 Cancel = true;

 66             }

 67         }

 68         private void wb_NewWindow2(ref object ppDisp, ref bool Cancel)

 69         {

 70             client = new WebClient();

 71             var url = wb.Document.ActiveElement.GetAttribute("href");

 72 

 73             if (UrlFilter(url))

 74             {

 75 

 76                 SaveFileDialog save = new SaveFileDialog();

 77                 //save.InitialDirectory = Application.ExecutablePath;

 78                 save.Filter = "All Files(*.*)|*.*";

 79                 save.Title = "下载全文";

 80                 save.OverwritePrompt = true;

 81                 save.RestoreDirectory = true;

 82                 save.ValidateNames = true;

 83                 save.CheckPathExists = true;

 84                 save.AddExtension = true;

 85                 String fOldName = url.Split('/')[url.Split('/').Length - 1];

 86                 if (!String.IsNullOrEmpty(fOldName))

 87                 {

 88                     save.FileName = fOldName;

 89                 }

 90                 if (save.ShowDialog() == DialogResult.OK)

 91                 {

 92                     //使用线程起动

 93                     Thread thdSub = new Thread(new ThreadStart(ThreadFun));

 94                     thdSub.Start();

 95                     client.DownloadFile(url, save.FileName);

 96                 }

 97                 MessageBox.Show(save.FileName);

 98                 Cancel = true;

 99             }

         }

 

         #region process bar

         private void ShowProcessBar()

         {

             myProcessBar = new ProcessBar();

             // 初始化进度条委托

             myIncrease = new IncreaseHandle(myProcessBar.Increase);

             myProcessBar.StartPosition = FormStartPosition.CenterParent;

             myProcessBar.ShowDialog();

             myProcessBar = null;

         }

         private void ThreadFun()

         {

             //线程中的一个委托

             MethodInvoker mi = new MethodInvoker(ShowProcessBar);

             this.BeginInvoke(mi);//异步挨靠委托

             //延时1秒显示窗口

             Thread.Sleep(1000);

 

             bool blnIncreased = false;

             object objReturn = null;

             //循环执行委托，直到返回值

             do

             {

                 Thread.Sleep(50);

                 objReturn = this.Invoke(this.myIncrease, new object[] { 2 });

                 blnIncreased = (bool)objReturn;

             }

             while (blnIncreased);

         }

         #endregion

 

         #region 过滤白名单

         public Boolean UrlFilter(String url)

         {

             Boolean result = false;

             url = url.ToLower();

             String[] filters = { ".rar", ".zip", ".pdf", ".txt", ".xls", ".xlsx", ".ppt", ".doc", ".docx" };

             foreach (String item in filters)

             {

                 if (url.EndsWith(item))

                 {

                     result = true;

                     break;

                 }

             }

             return result;

         }

         #endregion

     }

前台用我们自己的System.Windows.Forms.WebBrowser.