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标题: Http 下载文件并显示进度条 [打印本页]

作者: gxm771208 时间: 2016-10-28 12:50
标题: Http 下载文件并显示进度条
      /// <summary>
      /// HTTP 下载文件
      /// Current Thread Download
      /// </summary>
      /// <param name="URL">下载文件地址</param>
      /// <param name="buffer">将下载的文件存入该字节数组</param>
      /// <param name="Prog">用于显示的进度条</param>
      public void DownloadFile(string URL, ref byte[] buffer, ProgressBar prog)
      {
         try
         {
            System.Net.HttpWebRequest Myrq = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(URL);
            System.Net.HttpWebResponse myrp = (System.Net.HttpWebResponse)Myrq.GetResponse();
            long totalBytes = myrp.ContentLength;
            if (prog != null)
            {
                  prog.Maximum = (int)totalBytes;
            }
            using (MemoryStream ms = new MemoryStream((int)totalBytes))
            {
                  Stream st = myrp.GetResponseStream();
                  long totalDownloadedByte = 0;
                  byte[] by = new byte[1024];
                  int osize = st.Read(by, 0, (int)by.Length);
                  while (osize > 0)
                  {
                     totalDownloadedByte = osize + totalDownloadedByte;
                     System.Windows.Forms.Application.DoEvents();
                     ms.Write(by, 0, osize);
                     if (prog != null)
                     {
                        prog.Value = (int)totalDownloadedByte;
                     }
                     osize = st.Read(by, 0, (int)by.Length);
                  }
                  buffer = ms.ToArray();
                  st.Close();
            }
         }
         catch (Exception ex)
         {
            buffer = null;
            Console.WriteLine(ex.Message);
         }
      }

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