I have an excel file in my Response Output stream. I can Open the stream as a file after a prompt, but it doesn't seem I can save it directly to a specified folder on my client.
View 1 Repliesi will be passing the xml file like this:
[code]....
error:
Error 1 The best overloaded method match for 'System.Xml.Linq.XDocument.Load(string)' has some invalid arguments
cannot convert from 'System.IO.Stream' to 'string'
I'm using Filestream for read big file (> 500 MB) and I get the OutOfMemoryException. Any solutions about it?? I want this in my app asp.net: Read DATA from Oracle Uncompress file using FileStream and BZip2 Read file uncompressed and send it to asp.net page for download. When I read file from disk, Fails !!! and get OutOfMemory. My Code is:
using (var fs3 = new FileStream(filePath2, FileMode.Open, FileAccess.Read))
{
byte[] b2 = ReadFully(fs3, 1024);
}
// [URL]
public static byte[] ReadFully(Stream stream, int initialLength)
{
// If we've been passed an unhelpful initial length, just
// use 32K.
if (initialLength < 1)
{
initialLength = 32768;
}
byte[] buffer = new byte[initialLength];
int read = 0;
int chunk;
while ((chunk = stream.Read(buffer, read, buffer.Length - read)) > 0)
{
read += chunk;
// If we've reached the end of our buffer, check to see if there's
// any more information
if (read == buffer.Length)
{
int nextByte = stream.ReadByte();
// End of stream? If so, we're done
if (nextByte == -1)............................
I have an httpmodule and it has a handler for OnEndRequest. I am trying to write the HttpContext.Response.OutputStream to a file. I am trying to use the Read method of it. But when it is called the exception message i get is "Specified method is not supported". So i am not able to do what i want that is, write the response to a file on the disk. I am able to write the HttpContext.Request.InputStream to a file using its Read method which i do in a handler for OnBeginRequest.
View 2 RepliesI need to to export a file to the user. It takes 1-2 min to generate the file so I'd like to have the page go into a kind-of modal mode with a layover on the page and a 'Working' spinner showing. The problem is I can't make the modal stuff go away after Save File dialog is closed.
How can I remove the layover after the dialog is done?
how does the code within the <% .... %> brackets write to the output stream of a view?
Where view code that looked like the following would write the HTML for a <table> to the output html of the view.
<%
ToViewOutput( "<table>" ) ;
ToViewOutput( "<tr>" ) ;
ToViewOutput("<td>row1. cell 1.</td>") ;
ToViewOutput("<td>row1. cell 2.</td>") ;
oViewOutput("</tr>") ;
ToViewOutput("</table>") ;
%>
Is there a recommended or good way to stream the output messages asynchonously to a web form so there's some indication of progress? A bit like TeamCity does for build scripts. Should I be polling a webservice? Using the OutputDataReceived event? Turning off buffering?
View 2 RepliesI'm trying to return an xml string from a IHttpHandler to a like this: context.Response.Write(xml); When I receive the response in my .aspx.cs I try to load the document as follows: var xml = XDocument.Load(xmlString); but I get an Illegal Characters in Path error message. I've also tried
context.Response.Write(context.Server.HtmlEncode(xml));
and
var xml = XDocument.Load(Server.HtmlDecode(xmlString));
but I get the same message. Is there any way I can return XML from my IHttpHandler?
I have a folder with png images that are not shared or public (the folder is outside my application folder). Now I want my users to be able to view thoose images only if they are logged in (different users, different images). All images have a name that correspond to the users id. My idea is to stream thoose images into the asp:Image control, is that possible? How do I do that? Other (better) solutions?
View 6 RepliesI would like to read all content that's been written to the output stream. I'm attempting to do this using an HTTP module, and it seems like the obvious timing would be when handling the PreSendRequestContent event.
However, if the output stream seems to be set to write-only, as I can't read using a StreamReader. Is there a way I read and re-write the content without writing my own IIS module?
Is there some way to intercept the HTML output stream in asp.net and make modifications? Eg using httpmodules or something? I know this is possible using java servlets and assume there must be an elegant way to do this with asp.net.
My purpose is to combine the many javascript files into one composite script which has been minified/packed, to make the page load faster.Eg, if my page normally outputs the following in the page head:
<script type="text/javascript" src="/scripts/blah.js"></script>
<script type="text/javascript" src="/scripts/yada.js"></script>
I want to replace that with the following:
<script type="text/javascript" src="/scripts/all.js"></script>
(also i realise i'll have to create all.js somehow).
in previously asked question answeres said they dont get what i want to do exactly so heres is the full code also i simply want that instead of a TABLESe i rendered an image( of the content ) on the page
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.IO;
using System.Text;
using System.Data;
using System.Drawing;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
System.Web.UI.WebControls.Panel panelmain = new System.Web.UI.WebControls.Panel();
System.Web.UI.WebControls.Literal abc = new System.Web.UI.WebControls.Literal();
abc.Text = "as<br/>dasdas<br/>dasdad";
DataSet ds = new DataSet();
DataTable dt;
DataRow dr;
DataColumn idCoulumn;
DataColumn nameCoulumn;
dt = new DataTable();
idCoulumn = new DataColumn("ID", Type.GetType("System.Int32"));
nameCoulumn = new DataColumn("Name", Type.GetType("System.String"));
dt.Columns.Add(idCoulumn);
dt.Columns.Add(nameCoulumn);
dr = dt.NewRow();
dr["ID"] = 1;
dr["Name"] = "Name1";
dt.Rows.Add(dr);
dr = dt.NewRow();
dr["ID"] = 2;.............
MemoryStream export = new MemoryStream();
iCalendarSerializer serializer = new iCalendarSerializer(iCal);
serializer.Serialize(export,System.Text.Encoding.UTF8);
return export;
so I am using the C# DDay.iCal library for exporting my calendars. Serialize takes in a "stream" so I passed it a memory stream. I now have a generic handler that calls the method that contains the above code.
public class CalendarHandler : IHttpHandler
{
private Calendar service;
private Membership membershipS;
public void ProcessRequest(HttpContext context)
{
service = new Calendar ();
membershipS = new Membership (null);
string userName = context.User.Identity.Name;
Guid userId = membershipS.GetUsersId(userName);
context.Response.ContentType = "text/calendar";
// calls the export calendar(the code that showed above that uses dDay ical.
var t = service.ExportCalendar(userId);
t.WriteTo(context.Response.OutputStream);
}
public bool IsReusable
{
get
{
return false;
}
}
}
So now I wrote the icalendar to the Outputstream. Now I have a jquery post that goes to this method and now I am not sure how to take the OutputStream result that the jquery post will get and make it popup with a save dialog box.
$('#ExportCalendar').click(function(e)
{
$.post('../Models/CalendarHandler.ashx', null, function(r)
{
});
return false;
});
I created a simple Http Module that starts a timer on the PreRequestHandler and stops the timer on the PostRequestHandler to calculate the time it took the page to load. I then create some simple html and write my results to Response.Write. Since I'm doing this in the PostRequestHandler it's adding my results after the </html> tag. That's fine for testing but I need in a scenario where the page needs to validate.
I can't seem to figure out how I could manipulate the Response object to insert my results before the </body> tag. Response.Write and Response.Output.Write don't have that flexibility and I couldn't see a way to work with the Response as a string. Am I missing something easy?
We're getting this weird exception when trying to create a BitmapDecoder off an ASP.Net response stream. This is the line of code that throws the exception:
BitmapDecoder dec = BitmapDecoder.Create(
Request.Files[0].InputStream,
BitmapCreateOptions.PreservePixelFormat,
BitmapCacheOption.OnLoad);
Here's some info on the file being uploaded: Filename: bank statement.jpg, Content length: 266041, Mime type: image/jpeg
This is the exception stack trace:
System.IO.IOException: Cannot read from the stream. --->
System.Runtime.InteropServices.COMException (0x88982F72):
Exception from HRESULT: 0x88982F72 [code]...
how we can prevent this from happening?
Is is possible to update an image on an HTML page using the response stream of an ASP.NET Generic Handler? For example, if I have the following code on a handler: [URL]
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "image/png";
context.Response.WriteFile("~/images/test.png");
}
How can I call the handler in jQuery, using .ajax, and set an image on the page equal to the image that is returned by the Handler? I am ignoring the query string variable at the moment as I just want to get this working. Secondly, if I can do above, how can I loop through all of DIVs on the page that are of class "content", select a guid out of a hidden field to use as my query string parameter, and update the associated image within the same content DIV tag? A content div tag would look as follows:
<div class="content">
<asp:TextBox runat="server" Id="HiddenField_1" Value="C142E68F-B118-4565-9A9E-B2347F0B6D5B"/>
<img src="#"/>
</div>
<div class="content">
<asp:TextBox runat="server" Id="HiddenField_2" Value="GJ38AD23-B118-4565-9A9E-B2347F0B6D5B"/>
<img src="#"/>
</div>
I would like to have all the images updated on a periodic interval, so essentially, as a quick recap, I would need to have: A loop through all of my DIVs of class "content", occuring every n. seconds. Extractation the GUID from the hidden field. A call to my ASHX handler to get the updated image. Set the returned image to the corrisponding image on the page. Is this something that would be difficult to achieve? If not, what would I need to do to make this function in the above manner?
Is is possible to write to the http response stream from a dynamically created bitmap using the Response.Write/WriteFile without saving the image to the hard drive?
View 4 RepliesI'm using .net 3.5 and am currently creating a web application used to generate a report through Aspose.CellsActually, the page is composed in a form where I get the configuration of the report I have to generate. The "generation" button is in an update panel. When I click on it, the "generation" button is hidden and a progress bar appears. When the excel file is generated, I save it in a memory stream and I send it back to the aspx page where I change the headers to allow the file's download.
View 3 RepliesAfter a call to initial HttpWebResponse.GetResponseStream() and reading through the stream, that stream is done for and cannot be reused.
I have a situation where I need to examine the content of the response and if it is of a certain data, get another page and then pass the new response down the line. Otherwise, pass down the original response as is. The only problem is that after examining the response to check for this "special data", that response is no good to the downstream code.
The only way, I can think of, to make this transparent to the downstream code, is to create a derived class of HttpWebResponse, and somehow cache the data streamed, and pass that cached stream down the line instead of the initial stream. I'm not sure if that's even feasible since I haven't looked into it further.
I am trying to use a custom ITempDataProvider provider to store TempData in a browser's cookie instead of session state. However, everything works fine except that I am unable to remove the cookie from the Response stream after reading it. The code exexutes fine but the cookie won't go away.
[Code]....
And in my controller:
[Code]....
Im trying to resize an image. I have the original file and then try to resize it and save it to a new image.However, I get an exception because the value of stream cannot be null. This makes sense, but I dont know how to prevent it:
Value cannot be null.
Parameter name: stream
Description: An unhandled exception occurred during the execution of the current web request.
Source Error:
[Code]....
I have a form that streams a pdf to the browser. That works fine, the problem is when the user clicks the "save" button on the PDf that has been streamed, it saves the .aspx page! as to how I can set it to default to .pdf?
View 6 RepliesI am generating an Excel file upon a click of a button in an update panel. It is throwing a parsing error.
If I keep the button outside the update panel it is working fine. Why isn't it working in the update Panel?
Response.ContentType = "application/vnd.ms-excel"
Response.AddHeader("Content-Disposition",
String.Format("attachment;filename={0}", filename))
Response.Clear()
Response.BinaryWrite(WriteToStream.GetBuffer)
HttpContext.Current.ApplicationInstance.CompleteRequest()
Private Function WriteToStream() As MemoryStream
'Write the stream data of workbook to the root directory
Dim file As MemoryStream = New MemoryStream
hssfworkbook.Write(file)
Return file
End Function
Assume we have the access to sth.avi on [URL] with a direct link.
e.g : [URL] Also we have a website => www.dl2.com.
Now, we wanna let some users to download sth.avi from [URL], but we don't have enough space on [URL] to save sth.avi. Is it possible in ASP.NET for us to read sth.avi from www.dl.com as streaming file and share it without saving the file on our domain.
P.S: I don't wanna share this link [URL], actually I wanna share something like this link [URL]
I have made a WCF web service that streams a 200 mb zip file. how i can read this stream at my client and then give option to the user to download that
View 1 Replies