In my MSSQL Server I have a table named Nomogram including an attribute named Img1 which include an image of type varbinary(MAX)I wish to load that image on my webform using an http-handler (ashx).How do I do that? I have looked at this sample but I can figure it out how to solve my exact problem. [URL]
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I use http handler for loading images.
View 1 RepliesI have many static images under a directory in my site structure, and I'm not concerned with hotlinking or copy-protecting the images. For a myriad of reasons, what I need to do is not show the image path on the site (or show a fake one).
Is there any way to do this without resorting to an http handler or a worker asp.net page?
I tried this link to generate verification Image [URL] ..... It works fine.
But I'd like to put a button in page for regenerating captcha for example. When the image was unreadable for user.
So I put an updatepanel in page and this is my code:
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<tr> <td colspan="2">
<asp:Image ID="imCaptcha" ImageUrl="~/Captcha.ashx" runat="server" />
[Code] .....
Although the image changes but the whole page is refreshed. Whether this is due to incompatibilities httphandler and updatepanel?
I need displaying my image file stored from my database into the image control. I've had read some articles and watch video tutorial which there were perfectly working and I followed it but I wasn't able to make it work. The image control just displayed blank. I used Generic Handler to retrieve the image file from my database based on the articles and tutorials I've got. here are my codes below:
Generic Handler:
Code:
<%@ WebHandler Language="C#" Class="ShowImage" %>
using System;
using System.Configuration;
using System.Drawing;
using System.Drawing.Imaging;
[Code] ....
Asp.Net Code for the Image control:
HTML Code:
<asp:Image ID="Image1" runat="server" ImageUrl='<%# "ShowImage.ashx?ID=" + Eval("ID") %>' Height="128px" />
I create custom HTTP handler for auto generating file and I want to tell IIS7 to serve current request like normal static file because I need to use IIS and web.config file to control compression setting and any other HTTP header of current requested file.I know. there is an internal class called StaticFileHandler in ASP.net. But I cannot access it. Or you have any other way to work like this.
View 1 Repliesi redirect a page from http to https using http module begin request handler .i am calling webservice using ajax but it is saying webserice not defined .which otherwise works fineits work fine when rediect page in page_load instead .but i need to add function for https to http in every page. i still not know why ajax is not working when i use http module for redirect
View 3 RepliesBackground:
We are using the Facebook API and receive back URLs for profile image thumbnails. Unfortunately the protocol is restricted to just HTTP and it doesn't support HTTPS. The page on our site that hosts the thumbnails is always delivered via HTTPS, and if we use HTTP for the thumbnails the user will receive security warnings from their browser.
Solution:
Build an HTTP Handler that "passes through" the image from the Facebook URL, but allow the handler to be called via HTTPS. Before I started coding I thought I could something like this:
Response.OutputStream = WebRequest.Create(FacebookUrlForThumbnail)
but I ended up having to save the image to an object in memory than write the image to the Response.OutputStream using the image save function.
Current Code:
[Code]....
This seems inefficient but I can't find a way of using the HTTP Handler as I orginally intended. Is there way of accomplishing the goal without creating the image memory and just "passing through" the call?
I am using a handler to pull an image from the database and I need to resize the image while maintaining the aspect ratio.I have seen a few examples, but they were all pulling the image from the filesystem and not a database. This is the code I am using inside the handler to pull the image from the database:
[Code]....
Can someone point me in the right direction?
clear my concept What is HTTP module and HTTP Handler and how does they work while page requesting???
How authentication and Authorization process work in asp.net?
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
We have installed a web site written by others which is compiled with Visual Studio 2008 and hosted in Windows server 2008 R2.
The IIS connection timeout is set to 120 seconds. But for some pages, the first page loading fails with HTTP 404 error but sequential refresh can bring the page up. The same problem happens for some images which fail to load in web pages. We are not very sure it is network related issue or hosting issue.
I have update panel on the page to avoid postback and placed a dropdownlist control within that update panel. DrodownList is filled with Category names and also it's autopostback set to True.
Now whenever dropdownlist index change's on select, untill page loads complete data it should show mesage as "Loading.... in center and middle of the page and background should become bit transparent". And when page load completely with data then that background and message should get disappear.
I'm trying to write an HTTP GET handler. The path should start with http://site/processTask and have a set of URL-encoded parameters. I have the following in my web.config
<httpHandlers>
<remove verb="*" path="*.asmx"/>
<add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/>
<add verb="GET" path="processTask*" type="MyHandler.ProcessTaskHandler, MyHandler"/>
</httpHandlers>
now when I type the URL http://mysite/processTask in browser I get HTTP 404 but if I change the add verb line to the following one:
<add verb="GET" path="processTask.asmx*" type="MyHandler.ProcessTaskHandler, MyHandler"/>
and type http://mysite/ProcessTask.asmx in browser the handler is run and I get the response from the handler. What's the problem? Why is the handler run only when the path contains .asmx? How do I change web.config so that .asmx is not required?
Here's what I want to do:
I've created a class library project
and this has a class implementing
the IHttpHandler interface. Let's
call this class ZipHandler. Let's
say the namespace is Zip.
I want that whenever any Http
request comes for a zip file, my
ZipHandler should handle it,
regardless of whether the request is
to an Asp.Net application or a
normal virtual directory.
Queries:
Is it possible (it should be given
the hype about integrated pipeline
etc. in IIS 7)?
How to do it?
i have developed my asp.net application along wih crystal report .... i need to show loading image on ever client and server side request .... (i.e) like when ever IE progress bar get loading i want to show my gif loading ... after IE progress bar finish its loading, my gif loading image should disappear .
View 2 RepliesI am new to this topic. SO please look over my stupid mistakes. I have web application and its virtual directory path is as followshtpp://localhost/TxtXmlImggHandler/This root has three pages one for text, one for xml, one for images. Actually these pages call three different handlers. I had no problem when I send/receive some data to HTTPHandler for processing, had no problem when I request xml file from HTTPHandler.Now I am trying to get image from HTTPHandler, but no luck. All my HTTPHandlers are sitting in root of my web application
View 3 RepliesI successfully added and configured HttpHandler in an Asp.Net WebApplication, but facing problems while trying to add same HttpHandler to Asp.Net WebSite. I have registered it in the web.config, am i missing something This is the error I am getting Configuration Error
Description:
An error occurred during the processing of a configuration file required to service this request.
Parser Error Message: Could not load type 'MyHandler'.
Line 98: </pages>
Line 99: <httpHandlers>
Line 100: <add verb="*" path="*.result" type="MyHandler"/>
Line 101: <remove verb="*" path="*.asmx"/>
Here is handler
public class MyHandler: IHttpHandler
{
#region IHttpHandler Members
public bool IsReusable
{
get { return true; }
}
public void ProcessRequest(HttpContext context)
{
}
#endregion
}
NOTE: I have not made any request for the handler via url, it is just not letting me run application.
I have an VS2010 ASP.NET 4 web site app, to which I added the new Chart control.
When I deployed it to our web server, we get a" Internal Server Error 500." message.
I noticed that the following lines were added to the web.config since the last release, related to the chart control:
<system.web>
<httpHandlers>
<add path="ChartImg.axd" verb="GET,HEAD,POST" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
validate="false" />
</httpHandlers>
If I remove this added code from the web.config, the site works--Except for the charting functionality.
How do I get the site and the chart page to work?
This is not an issue on IIS versions < 7.
Scenario: I have a bunch of web applications for which I want to add a simple ping functionality via http handler. Example: [URL]
Problem: For some of the applications this approach does not work becasue of custom HttpModule. These modules have some depedency on either authentication or some other processing logic due to which it makes the request invalid.
I am trying to find a solution to get this ping functionality work without making any changes to existing HttpModules.
I'm using output caching in my custom HTTP handler in the following way:
public void ProcessRequest(HttpContext context)
{
TimeSpan freshness = new TimeSpan(0, 0, 0, 60);
context.Response.Cache.SetExpires(DateTime.Now.Add(freshness));
context.Response.Cache.SetMaxAge(freshness);
context.Response.Cache.SetCacheability(HttpCacheability.Public);
context.Response.Cache.SetValidUntilExpires(true);
...
}
It works, but the problem is that refreshing the page with F5 leads to page regeneration (instead of cache usage) despite of the last codeline:
context.Response.Cache.SetValidUntilExpires(true);
UPD: Seems like the cause of problem is that HTTP handler response isn't caching on server. The following code works well for web-form, but not for handler:
Response.Cache.SetCacheability(HttpCacheability.Server);
Are there some specifics of the caching the http handler response on server?
I want to use HTTP Handler in order to create a RSS feeds. For the purpose, I want to put my logic for creating the rss XML in C# class, which implement IHttpHandler, then to "map" this handler into the web.config file and to register the "mapped name" in my routing rules. I am doing something like this:
public class RSSFeedHandler:IHttpHandler
{
public void ProcessRequest( HttpContext context )
{
[code]...
I have the next problem: I need to process only 1 request at a time from each user. Lets assume that server identifies each user be UserID, sent in query string.cHow can make the server work the way like FIFO (do not start processing next request until the previous is fully processed)? Should I use the named mutexes inside HTTP handler and assign the name to mutex by UserID?
View 1 Repliesi have an ASP.NET 4.0 HTTP handler that should receive and send data in json format. I'm using jquery to send json objects serialized in a string to the handler. It correctly sends the request but i don't know how i could retrieve the data from the httpcontext passed to the handler and how i could deserialize it..
UPDATE 1
$.ajax({
type: "POST",
url: "myurl.ashx",
dataType: "json",
contentType: "application/json; charset=utf-8",
data: $.toJSON({
...
}),
success: function (response) {
...
}
});
I'm just reading about implementing my own HTTP handler for ASP.NET 4.0 and IIS7. This looks really cool. I want special processing for ZIP files and it seems like an HTTP handler is the perfect solution.However, what's giving me trouble is that the handler must be in a separate assembly. So how can I access the rest of my application from this assembly?Specifically, I'd like to determine if the user is authenticated and redirect them to the login page if they are not. But User.Identity.IsAuthenticated, etc. will not be available from my handler.(Yes, I know there are ways to approach this without an HTTP handler but they don't seem appropriate for my specific needs.)
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