win/C#/frmDownload.cs

   1 /*  frmDownload.cs $\r
   2     This file is part of the HandBrake source code.\r
   3     Homepage: <http://handbrake.fr>.\r
   4     It may be used under the terms of the GNU General Public License. */\r
   5 \r
   6 namespace Handbrake\r
   7 {\r
   8     using System;\r
   9     using System.Diagnostics;\r
  10     using System.IO;\r
  11     using System.Net;\r
  12     using System.Threading;\r
  13     using System.Windows.Forms;\r
  14 \r
  15     /// <summary>\r
  16     /// The Download Window\r
  17     /// </summary>\r
  18     public partial class frmDownload : Form\r
  19     {\r
  20         private readonly Thread downloadThread;\r
  21         private Stream responceStream;\r
  22         private Stream localStream;\r
  23         private HttpWebRequest webRequest;\r
  24         private HttpWebResponse webResponse;\r
  25         private static int progress;\r
  26         private bool killThread;\r
  27 \r
  28         private delegate void UpdateProgessCallback(long bytesRead, long totalBytes);\r
  29 \r
  30         private delegate void DownloadCompleteCallback();\r
  31 \r
  32         private delegate void DownloadFailedCallback();\r
  33 \r
  34         public frmDownload(string filename)\r
  35         {\r
  36             InitializeComponent();\r
  37 \r
  38             this.downloadThread = new Thread(Download);\r
  39             this.downloadThread.Start(filename);\r
  40         }\r
  41 \r
  42         private void Download(object file)\r
  43         {\r
  44             string tempPath = Path.Combine(Path.GetTempPath(), "handbrake-setup.exe");\r
  45             string hbUpdate = (string)file;\r
  46             WebClient wcDownload = new WebClient();\r
  47 \r
  48             try\r
  49             {\r
  50                 if (File.Exists(tempPath))\r
  51                     File.Delete(tempPath);\r
  52 \r
  53                 this.webRequest = (HttpWebRequest)WebRequest.Create(hbUpdate);\r
  54                 this.webRequest.Credentials = CredentialCache.DefaultCredentials;\r
  55                 this.webResponse = (HttpWebResponse)this.webRequest.GetResponse();\r
  56                 long fileSize = this.webResponse.ContentLength;\r
  57 \r
  58                 this.responceStream = wcDownload.OpenRead(hbUpdate);\r
  59                 this.localStream = new FileStream(tempPath, FileMode.Create, FileAccess.Write, FileShare.None);\r
  60 \r
  61                 int bytesSize;\r
  62                 byte[] downBuffer = new byte[2048];\r
  63 \r
  64                 long flength = 0;\r
  65                 while ((bytesSize = this.responceStream.Read(downBuffer, 0, downBuffer.Length)) > 0)\r
  66                 {\r
  67                     if (this.killThread)\r
  68                         return;\r
  69                     this.localStream.Write(downBuffer, 0, bytesSize);\r
  70                     flength = this.localStream.Length;\r
  71                     Invoke(new UpdateProgessCallback(this.UpdateProgress), new object[] {this.localStream.Length, fileSize});\r
  72                 }\r
  73 \r
  74                 this.responceStream.Close();\r
  75                 this.localStream.Close();\r
  76 \r
  77                 if (flength != fileSize)\r
  78                     Invoke(new DownloadFailedCallback(this.DownloadFailed));\r
  79                 else\r
  80                     Invoke(new DownloadCompleteCallback(this.DownloadComplete));\r
  81             }\r
  82             catch\r
  83             {\r
  84                 // Do Nothing \r
  85             }\r
  86         }\r
  87 \r
  88         private void UpdateProgress(long bytesRead, long totalBytes)\r
  89         {\r
  90             long p = (bytesRead * 100) / totalBytes;\r
  91             int.TryParse(p.ToString(), out progress);\r
  92             progress_download.Value = progress;\r
  93             lblProgress.Text = (bytesRead / 1024) + "k of " + (totalBytes / 1024) + "k ";\r
  94         }\r
  95 \r
  96         private void DownloadComplete()\r
  97         {\r
  98             lblProgress.Text = "Download Complete";\r
  99             btn_cancel.Text = "Close";\r
 100 \r
 101             Process.Start(Path.Combine(Path.GetTempPath(), "handbrake-setup.exe"));\r
 102             this.Close();\r
 103             Application.Exit();\r
 104         }\r
 105 \r
 106         private void DownloadFailed()\r
 107         {\r
 108             lblProgress.Text = "Download Failed";\r
 109             btn_cancel.Text = "Close";\r
 110         }\r
 111 \r
 112         private void btn_cancel_Click(object sender, EventArgs e)\r
 113         {\r
 114             this.killThread = true;\r
 115             lblProgress.Text = "Cancelling ...";\r
 116             if (this.webResponse != null) this.webResponse.Close();\r
 117             if (this.responceStream != null) this.responceStream.Close();\r
 118             if (this.localStream != null) this.localStream.Close();\r
 119             this.Close();\r
 120         }\r
 121     }\r
 122 }