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     public partial class frmDownload : Form\r
  16     {\r
  17         private readonly Thread _downloadThread;\r
  18         private Stream _responceStream;\r
  19         private Stream _loacalStream;\r
  20         private HttpWebRequest _webRequest;\r
  21         private HttpWebResponse _webResponse;\r
  22         private static int _progress;\r
  23         private bool _killThread;\r
  24 \r
  25         private delegate void UpdateProgessCallback(long bytesRead, long totalBytes);\r
  26 \r
  27         private delegate void DownloadCompleteCallback();\r
  28 \r
  29         private delegate void DownloadFailedCallback();\r
  30 \r
  31         public frmDownload(string filename)\r
  32         {\r
  33             InitializeComponent();\r
  34 \r
  35             _downloadThread = new Thread(Download);\r
  36             _downloadThread.Start(filename);\r
  37         }\r
  38 \r
  39         private void Download(object file)\r
  40         {\r
  41             string tempPath = Path.Combine(Path.GetTempPath(), "handbrake-setup.exe");\r
  42             string hbUpdate = (string) file;\r
  43             WebClient wcDownload = new WebClient();\r
  44 \r
  45             try\r
  46             {\r
  47                 if (File.Exists(tempPath))\r
  48                     File.Delete(tempPath);\r
  49 \r
  50                 _webRequest = (HttpWebRequest) WebRequest.Create(hbUpdate);\r
  51                 _webRequest.Credentials = CredentialCache.DefaultCredentials;\r
  52                 _webResponse = (HttpWebResponse) _webRequest.GetResponse();\r
  53                 long fileSize = _webResponse.ContentLength;\r
  54 \r
  55                 _responceStream = wcDownload.OpenRead(hbUpdate);\r
  56                 _loacalStream = new FileStream(tempPath, FileMode.Create, FileAccess.Write, FileShare.None);\r
  57 \r
  58                 int bytesSize;\r
  59                 byte[] downBuffer = new byte[2048];\r
  60 \r
  61                 long flength = 0;\r
  62                 while ((bytesSize = _responceStream.Read(downBuffer, 0, downBuffer.Length)) > 0)\r
  63                 {\r
  64                     if (_killThread)\r
  65                         return;\r
  66                     _loacalStream.Write(downBuffer, 0, bytesSize);\r
  67                     flength = _loacalStream.Length;\r
  68                     Invoke(new UpdateProgessCallback(this.UpdateProgress), new object[] {_loacalStream.Length, fileSize});\r
  69                 }\r
  70 \r
  71                 _responceStream.Close();\r
  72                 _loacalStream.Close();\r
  73 \r
  74                 if (flength != fileSize)\r
  75                     Invoke(new DownloadFailedCallback(this.DownloadFailed));\r
  76                 else\r
  77                     Invoke(new DownloadCompleteCallback(this.DownloadComplete));\r
  78             }\r
  79             catch\r
  80             {\r
  81                 // Do Nothing \r
  82             }\r
  83         }\r
  84 \r
  85         private void UpdateProgress(long bytesRead, long totalBytes)\r
  86         {\r
  87             long p = (bytesRead * 100) / totalBytes;\r
  88             int.TryParse(p.ToString(), out _progress);\r
  89             progress_download.Value = _progress;\r
  90             lblProgress.Text = (bytesRead / 1024) + "k of " + (totalBytes / 1024) + "k ";\r
  91         }\r
  92 \r
  93         private void DownloadComplete()\r
  94         {\r
  95             lblProgress.Text = "Download Complete";\r
  96             btn_cancel.Text = "Close";\r
  97 \r
  98             Process.Start(Path.Combine(Path.GetTempPath(), "handbrake-setup.exe"));\r
  99             this.Close();\r
 100             Application.Exit();\r
 101         }\r
 102 \r
 103         private void DownloadFailed()\r
 104         {\r
 105             lblProgress.Text = "Download Failed";\r
 106             btn_cancel.Text = "Close";\r
 107         }\r
 108 \r
 109         private void btn_cancel_Click(object sender, EventArgs e)\r
 110         {\r
 111             _killThread = true;\r
 112             lblProgress.Text = "Cancelling ...";\r
 113             if (_webResponse != null) _webResponse.Close();\r
 114             if (_responceStream != null) _responceStream.Close();\r
 115             if (_loacalStream != null) _loacalStream.Close();\r
 116             this.Close();\r
 117         }\r
 118     }\r
 119 }