private void DownloadFile(HttpContext context, string queryFile, JavaScriptSerializer jsonSerialiser, ProgressData progressData)
{
Stream stream = null;
int bytesToRead = 65536; //64 kilobytes
byte[] buffer = new Byte[bytesToRead];
try
{
string file = Path.Combine(context.Server.MapPath("~/Files/"), queryFile);
stream = File.Open(file, FileMode.Open);
context.Response.Clear();
context.Response.ContentType = "application/pdf"; //"application/octet-stream";
context.Response.AddHeader("Content-Disposition", "attachment; filename=\"" + queryFile + "\"");
context.Response.AddHeader("Content-Length", stream.Length.ToString());
context.Response.Buffer = false;
//context.Response.Charset = "";
context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
int length;
int totalRead = 0;
do
{
if (context.Response.IsClientConnected)
{
length = stream.Read(buffer, 0, bytesToRead);
totalRead += length;
context.Response.OutputStream.Write(buffer, 0, length);
progressData.CurrentOperationText = queryFile;
progressData.PrimaryTotal = (stream.Length / 1024).ToString() + "kB";
progressData.PrimaryValue = (totalRead / 1024).ToString() + "kB";
progressData.PrimaryPercent = Convert.ToInt32((100 * totalRead / stream.Length));
var json = jsonSerialiser.Serialize(progressData);
hub.Clients.All.broadcastNotification(json);
System.Threading.Thread.Sleep(500);
context.Response.Flush();
buffer = new Byte[bytesToRead];
}
else
{
// cancel the download if client has disconnected
length = -1;
}
} while (length > 0); //Repeat until no data is read
}
finally
{
if (stream != null)
{
progressData.Completed = true;
var json = jsonSerialiser.Serialize(progressData);
hub.Clients.All.broadcastNotification(json);
stream.Close();
}
}
}
public void ProcessRequest(HttpContext context)
{
string queryFile = context.Request.QueryString["file"];
hub = GlobalHost.ConnectionManager.GetHubContext<UpdateHub>();
var jsonSerialiser = new JavaScriptSerializer();
ProgressData progressData = new ProgressData();
DownloadFile(context, queryFile, jsonSerialiser, progressData);
}
