Write Binary Data As A Response In MVC Web Control?

Apr 28, 2010

I am trying to get a control (not a controller -- a subclass of System.Web.UI.WebControls.WebControl), that can be used that I wrote for ASP.NET to work in an ASP.NET MVC environment. Normally, the control does the normal thing, and that works fine

Sometimes it needs to respond by clearing the response, writing an image to the response stream and changing the content type. When you do this, you get an exception "OutputStream is not available when a custom TextWriter is used".

If I were a page or controller, I see how I can create custom responses with binary data, but I can't see how to do this from inside a control's render functions. To simplify it -- imagine I want to make a web control that renders to:

<img src="pageThatControlIsOn?controlImage">

And I know how to look at incoming requests and recognize query strings that should be routed to the control. Now the control is supposed to respond with a generated image (content-type: image/png -- and the encoded image). In ASP.NET, we:

Response.OutputStream.Write(thePngData); // this throws in MVC
// set the content type, etc

How am I supposed to do that in an ASP.NET MVC control?

View 2 Replies

Similar Messages:

C# - How To Write Binary Data "as Is" To Registry (ie: I Have Visible Binary Data As String From Regedit Only)

Feb 23, 2011

I have been googling this and have not come along a working solution for an entire day. I don't know anything about binary data types (as I've never knowingly used them) and I'm trying to write a binary value that I see in the registry, to the registry. Now, all I see is the following [shown below]... and if I try to pass that as a string to the RegSetValueEx in the WinAPI and of course it errors out... I do not know what 'numbers' I need to pass into the lpData As Any, argument of RegSetValueEx (i tried a bit array) in order for it to come out as the following [shown below] in the regedit. I really have no idea, and my tests to place random numbers in the bit array just produce corresponding random "figures" as visible in regedit that I do not understand how to 'tie' them together logically.

here is the culprit!


If I had the following in a string or a bit array, what must I populate the bitarray with so that the registry outputs this [above] when written? or, how can I figure out how to do it? I was hoping there'd be a function that reads my string of binary data and transforms it into the real binary format to submit to the RegSetValueEx function in VB6 or other function in VB.Net or C# (this really is a language agnostic question, and the problem exists in all languages; ie: same process).

View 2 Replies

What's Difference Between Response.write And Response.output.write

Apr 22, 2010

what is difference between Response.write and Response.output.write

View 2 Replies

Custom Server Controls :: Writing Image Binary Data To The Response

Sep 21, 2010

I've created 2 web user controls. A = User control that displays an image, and B is the user control that hosts A. I'm trying to stream an array of bytes to A, but it seems like the Response.BinaryWrite method completely overwrites any heirachial controls (I can't see any of B's other controls besides the image).

How do I get A to just display the image from the byte stream? It doesn't come from a database, it's an image I created on the fly.

A's code:


View 6 Replies

Response.Write Not Working Inside Server Control Property?

Nov 17, 2010

I am not sure why this is not working.

<asp:Label ID="lblTitle1" runat="server" Text='<%= string.Format("{0} <br /> {1}","Part 1", "Part 2") %>' ></asp:Label>

I just want to combine two resource string as text of label?

View 3 Replies

Write Response.write Within Update Panel?

Oct 6, 2010

i am calling a function which is inside Homescroll.ascx.cs from Homescroll.ascx so i wrote on Homescroll.ascx as <% Response.Write(scroll()); %> but all this is in update panel,and i am getting errors. so is their any other way to call function from homescroll.ascx to homescroll.ascx.cs,instead of response.write();

View 3 Replies

HTTP Response And Request In Binary

Feb 21, 2010

I need to I can make the web request to a webservice which take a XML argument. And is expected to return a Binary response. I am able to make the request but while recieving the response back I am unable to get the response in binary. When I read the response
using streamreader see the header and some attached "HEBRISH" words probably binary but unable to sepreate it out. Please help in seprating out the binary the response data.

View 1 Replies

How To Get And Save/write File (.doc, .xls, Etc) In Database In Binary Format

Mar 4, 2010

Actually I want to get a file and save its length, its MIME type, content into database in binary format.

It saved but not open in hander in correct format.


View 1 Replies

C# - Read And Write Binary Excel File Without Com Library?

Feb 26, 2010

I want to read and write excel file . it can do with oledb , there is a limitation maximunm characters < 255 solution is mono data type , now create table become second sheet (when open excel it is shown as hidden.)

View 2 Replies

How To Write A Binary Image To A Database Using C# And A Custom Http Hander

Jan 30, 2011

The thinking behind the question is that my image current reads it's data from a custom httphandler that gets the image from the database. I want to be able to use a file upload control to "post" a replacement file back to a "write" handler, updating the database. Then I can refresh my image using javascript to the original "read" handler. Is this possible?

I currently have a standard postback model upload process which puts the image into the database and a custom handler to read it back. What I want to know, is can you create a custom http handler to perform the upload so I could asynchronously call the upload handler then refresh the image src to pull it back from the database. At the moment I am using the IFrame approach to make it appear asynchronous, I just want to know the best practice really

View 2 Replies

Web Forms :: To Use Response.Write To Adjust Column Widths When Exporting Data To MS Excel?

Feb 14, 2010

Is there a simple way to use Response.Write to adjust column widths when exporting data to MS Excel?

View 3 Replies

Possible To Convert Datatable Into Binary Data And Save It Into On Binary Field On Database

Sep 20, 2010

Is it possible to convert a datatable into binary data and save it into on a binary field on database?

View 2 Replies

HttpHandlers / Modules :: Context.Response.Output Vs Context.Response.Write()?

Jan 24, 2010

I have written simple HttpModule. context.Response.Output.Write is working fine. but not context.Response.Write().

View 2 Replies

AJAX :: Reading Binary Data Using Asyncfileupload Control?

Jan 31, 2010

i am using AsyncFileUpload1 control

<asp:UpdatePanel ID="upSummerization" runat="server">
<div id="divFileUpload" runat="server">
<asp:Label ID="lblAttachDoc" Text="AttachDocument" runat="server"></asp:Label>
<cc1:AsyncFileUpload ID="AsyncFileUpload1" runat="server" />

i want to read bytes from uploaded document usning this control but i am get bytes length 0

Dim bytes As Byte() = New Byte() {}
Dim fs As Stream = Me.AsyncFileUpload1.FileContent
Dim br As New BinaryReader(fs)
bytes = br.ReadBytes(fs.Length)

View 1 Replies

C# - Can I Zip Response.write

Jan 21, 2010

Let me explain better than what the question state. I dynamically generate a KML file from an aspx page and use routing to change the url so I can access myapp.com/mykml.kml and the download starts. I use Response.write() in the aspx page to send the data and it work flawlessly. But there is a zipped version for KML files which is KMZ and I am wondering if I can still use my aspx page to serve a KMZ instead of a KML. Since I do not use a file I cannot "zip" it. Is there a way to zip the stream and output it in the Response.Write()?

View 1 Replies

Data Controls :: Display Image From Binary Data In Database In Detailview Control?

May 12, 2012

I want to display image in detailview.. I used image datatype in the database instead of using varbinary. but the problem is.. detail view is not fetching the picture..

how i display the picture of datatype image.

View 1 Replies

Response.Write New Line In Vb?

Sep 13, 2010

how come the following won't write to different lines? It is all in the same sub.


View 2 Replies

Can Pass Response And Write Value To A Label

Oct 13, 2010

I have the following subroutine:
Public Sub StartTimeDif()
Dim dt As DateTime = Convert.ToDateTime(starttimeInput.Text)
Dim dt1 As DateTime = Convert.ToDateTime(endtimeInput.Text)
Dim ts As TimeSpan = dt1.Subtract(dt)
End Sub
and I'm trying to pass (ts.minutes) to durationLabel.

View 21 Replies

How To Write Page Response Syntax

Oct 25, 2010

In the past I have always worked from the code behind page in ASP.NET and emitting all of my markup from that area.I am now learning MVC and am working in the .ASPX page directly.

<%= Html.Label("Test") %>
<%: Html.Label("Test")%>
<% Html.Label("Test"); %>

View 1 Replies

Response.Write JSONP Using JQuery And WCF?

Nov 18, 2010


The service cannot be activated because it does not support ASP.NET compatibility. ASP.NET compatibility is enabled for this application. Turn off ASP.NET compatibility mode in the web.config or add the AspNetCompatibilityRequirements attribute to the service type with RequirementsMode setting as 'Allowed' or 'Required'.

when i try to access wcf service i get this error: the reason is HttpContext.Current is null, what should i do in this case?

Object reference not set to an instance of an object.

System.Web.Script.Serialization.JavaScriptSerializer s = new System.Web.Script.Serialization.JavaScriptSerializer();
Person p = new Person() { FirstName = "First name", LastName= "last name" };
string json = s.Serialize(p);
System.Web.HttpContext.Current.Response.Write("jsoncallback" + json);} //error

View 2 Replies

Using Alert In Response.Write Function In C#

Feb 23, 2011

I have database code like this

string strConnectionString = ConfigurationManager.ConnectionStrings["SqlServerCstr"].ConnectionString;
SqlConnection myConnection = new SqlConnection(strConnectionString);
string hesap = Label1.Text;
string musteriadi = DropDownList1.SelectedItem.Value;
string avukat = DropDownList2.SelectedItem.Value;
SqlCommand cmd = new SqlCommand("INSERT INTO AVUKAT VALUES (@MUSTERI, @AVUKAT, @HESAP)", myConnection);
cmd.Parameters.AddWithValue("@HESAP", hesap);.......

It works fine but what I want, in the catch function, is to call the javascript alert function.

I've tried this

Response.Write("<script language=javascript>alert('ERROR');</script>);

But there is an error

How can I show error message in javascript alert function?

View 2 Replies

Correct Usage Of Response.Write() In C#?

Jan 3, 2011

I am trying to force a download of an XML file when the user visits a page.

This is the code I am using

public partial class GenerateTemplate : LayoutsPageBase
protected void Page_Load(object sender, EventArgs e)
//Going about generating my XML
Response.AddHeader("content-disposition", "attachment; filename=template.xml");

I am facing a problem that my download window hangs indefinitely, without ever completing the download/Open of the file.

What am I doing wrong? Am I not disposing any objects or closing any connections here?

View 4 Replies

Web Forms :: Getting Response.Write Value Into A Asp:textbox?

Jan 5, 2011

how can i get get below value into asp:textbox

Response.Write("<script id=""mycountry3"" language=""Javascript"" src=""http://www.ip2phrase.com/ip2phrase.asp?template=You are from Country: <COUNTRY> ""></script>")

View 2 Replies

Web Forms :: Response.write In Iframe In IE?

Apr 21, 2010

in a webpage I have a link to let the user download file, such as,

<a href="showfile.aspx?filename=xxx">download file</a>

in showfile.aspx, I send the file using Response.OutputStream.Write method. now I get some problem when somebody put this webpage in an IFrame and open in IE, as I checked the code, showfile.aspx is requested twice when clicks the link, and in the second time the cookies of authorization and session Id are missing. I tried to add the p3p header but not working.my question is, is this how the IE designed with iframe? is there anyway to work around?

View 3 Replies

Web Forms :: Response.Write Breaking CSS?

Jan 5, 2010

I have an aspx page and when the user clicks a button the following code runs:

Response.Write(string.Format("<script language='javascript'> window.open('DisplayImage.aspx?DocumentID={0}', 'window','HEIGHT=600,WIDTH=820,top=50,left=50,toolbar=yes,scrollbars=yes,resizable=yes');</script>",

The variable id is declared and it's value set eralier in the method.When the new window opens it displays the image properly, but the existing page suddenly loses all of it's styling. The links double in size and change font family. Does anyone know a way to retain styling on the calling page?

View 3 Replies

Copyrights 2005-15 www.BigResource.com, All rights reserved