I am designing a website using friendly urls in ASP.NET. I am encountering an interesting bug when I am using response's redirect function with variables. When the page is redirected with a variable, the page you land on seems to think that the page you are on is in fact the home directory, destroying all links in the process. For example, if I redirect to a page and pass a variable like so:
Response.Redirect("nextpage/variable",false);
If I have an image on the next page, the link changes from:
<img src="images/foo.png">
to
<img src="nextpage/images/foo.png">
This happens no matter what the original path is. I have tried to link the image to the home directoty, ie:
<img src="./images/foo.png">
<img src="~/images/foo.png">
Nothing has worked. It now thinks the home directory begins at the new page (I assume because it sees the name of the friendly url and thinks its a folder)
To any of those looking for an answer, the trick is not to use './' or "~/", but simple to use the forward slash '/' , like so:
<img src="/images/foo.png">
The forward slash goes back to the root for all links and images. :)
For reasons outside my control I have been requested to render a series of images on a web page (sort of a gallery view) based on a directory structure utilizing a UNC path. You'll note that I'm using relative paths as I work on this but will be deploying the site using UNC conventions.
I’ve created the following partial view to render the images, I can format later.
#model System.Collections.Generic.List<string>
#foreach (var image in Model)
{
<div id="ptImage">
<img src="#image" alt="#Path.GetFileName(image)"/>
</div>
}
Where #image above represents the absolute path to the image needing to be rendered.
The paths displayed in view source of the page are what I feel I should be expecting back and truly define locally the location of the image. When accessing images via a relative path is this what others would expect?
<div id="gImg">
<img src="C:\Projects\Test_Site\Site_1\ES3\ES3_0.bmp" alt="ES3_0.bmp" />
</div>
<div id="gImg">
<img src=" C:\Projects\Test_Site\Site_2\ES4\ES4_0.jpg" alt="ES4_0.jpg" />
</div>
When the partial view loads I only see the alternative text of the image, not the image itself. A look at the IIS Express log tells me the following:
http://localhost:1348/TestGallery/ 404 0 2 6, This resource lead me to understand that 404 0 2 x seems to indicate the resource isn't found.
With that truly being the path to the file, what is IIS expecting as a valid input to locate the resource? I'm not sure how to phrase the question to perform a further search.
The src paths in the img tags need to be web site URLs, not actual file locations on disk. Your web app should translate the URLs to grab the image from the appropriate location.
One possible solution:
Make a custom entry in your application's RouteConfig.cs to treat all items on a certain URL path dynamically. (In this example it is a separate controller.)
routes.MapRoute(
name: "Images",
url: "image/{*querypath}",
new { controller = "Image", action = "Retrieve" }
);
In the code that handles arbitrary query path, translate the relative URL (in querypath above) to the UNC path you're looking for and serve the image.
return File(UncRootPath + querypath, "image/png");
I am using MVC/Razor/.Net/C# and i would like to allow users to change the theme of the site just like you can change the theme in microsoft windows.
Does anyone know how to, or, can point me in the direction of some good tutorials/examples.
Cheers
This is a very, very broad question with any number of correct approaches.
You could create a base controller that loads the user's selected CSS theme name from a database during each request. Then you can put that value into the ViewBag (or ViewData) and reference it in your view:
<head>
#{
var themeName = ViewBag.ThemeName;
}
#if (String.IsNullOrWhiteSpace(themeName)) {
themeName = "default";
}
<link href="#Url.Content(String.Format("~/themes/{0}.css", themeName))" type="text/stylesheet" />
</head>
Usually this functionality is achieved with multiple CSS files and has little (or nothing to do with .NET).
You should design your HTML in a semantic way so that by changing the CSS files the entire output is different with each CSS applied.
This link gives a more explanatory intro into the subject -> http://www.thesitewizard.com/css/switch-alternate-css-styles.shtml
After you do that, what you need to do in your application is to store the user preference (of what skin) in a session or something like that and change the CSS file accordingly.
Asp.Net WebForms use to have the Skin/Theme feature, but I think that it was deprecated (it is not very good) and I also saw an implementation where instead of HTML the developer used XML and XSLT files to render the views (which is also too complicated for my taste).
I have some text which is loaded from a resource file. Ordinarily, to get dynamic content I would use:
string.Format(GetLocalResourceObject("SomeText"), PhoneNumberAsString)
I want to do the same with a link, only the link needs to be application relative as I have URLs like mysite.com/page.aspx and mysite.com/fr/page.aspx.
I normally use an <asp:HyperLink /> tag to create the links as I can then just put a squiggle at the start NavigateUrl="~/page.aspx". However, I don't know of a way to get a dynamic HyperLink to appear as a string without adding it as a control to something.
Simply writing ToString() outputs System.Web.UI.WebControls.HyperLink..
How do I get a link out of a resource file and make it into a hyperlink using ASP.NET Webforms?
UPDATE
With some help from the answers I now have the following code on my page:
<p><%= string.Format(GetGlobalResourceObject("Resource", "MoreThan1000Users").ToString(), ResolveUrl("~/contact-us.aspx")) %></p>
and in my resource file I have:
If you would like more than 1000 users please call our sales team.
Does this seem like good practice or is there another way to achieve what I'm doing? I don't know if I should be happy or not that there is HTML inside the resource file.
Since you haven't posted code, I'm guessing somewhere you have a HyperLink WebControl object that you're hitting ToString() on. If that's the case, you can access the URL associated with it using its myHyperLinkControl.NavigateUrl property.
If you're storing the link in your resource with a squiggle/tilde (which is good) then you can replace the squiggle with your application location. If you have a control/page, then you can easily call its ResolveURL method (which takes the tilde and automatically replaces it) There's some existing solutions if you don't have a control/page reference with your context, then there's some discussion to do that here: ResolveUrl without an ASP.NET Page
I guess this is what you want:
Server.MapPath("~/page.aspx")
That will work inside your aspx and your code-behind.
Simple enough question: I've created a small app that is basically just a favourites that sits in my system tray so that I can open often-used sites/folders/files from the same place. Getting the default icons from my system for known file types isn't terribly complicated, but I don't know how to get the favicon from a website. (SO has the grey->orange stack icon in the address bar for instance)
Does anyone know how I might go about that?
You'll want to tackle this a few ways:
Look for the favicon.ico at the root of the domain
www.domain.com/favicon.ico
Look for a <link> tag with the rel="shortcut icon" attribute
<link rel="shortcut icon" href="/favicon.ico" />
Look for a <link> tag with the rel="icon" attribute
<link rel="icon" href="/favicon.png" />
The latter two will usually yield a higher quality image.
Just to cover all of the bases, there are device specific icon files that might yield higher quality images since these devices usually have larger icons on the device than a browser would need:
<link rel="apple-touch-icon" href="images/touch.png" />
<link rel="apple-touch-icon-precomposed" href="images/touch.png" />
And to download the icon without caring what the icon is you can use a utility like http://www.google.com/s2/favicons which will do all of the heavy lifting:
var client = new System.Net.WebClient();
client.DownloadFile(
#"http://www.google.com/s2/favicons?domain=stackoverflow.com",
"stackoverflow.com.ico");
Updated 2020
Here are three services you can use in 2020 onwards
<img height="16" width="16" src='https://icons.duckduckgo.com/ip3/www.google.com.ico' />
<img height="16" width="16" src='http://www.google.com/s2/favicons?domain=www.google.com' />
<img height="16" width="16" src='https://api.statvoo.com/favicon/?url=google.com' />
You can use Google S2 Converter.
http://www.google.com/s2/favicons?domain=google.com
Source: http://www.labnol.org/internet/get-favicon-image-of-websites-with-google/4404/
This question is the first google search result I got when I keep searching for website favicon API. So I think it'll be still helpful in the future.
https://icon.horse/icon/[url.hostname] will give you a better site icon.
https://icon.horse/icon/stackoverflow.com
You can do it without programming in 3 steps:
1. Just open the web site, right-click and select "view source" to open the HTML code of that site. Then in the text editor search for "favicon" - it will direct you to something looking like
<link rel="icon" href='/SOMERELATIVEPATH/favicon.ico' type="image/x-icon" />
Take the string in href and append it to the web site's base URL (let's assume it is "http://WEBSITE/"), so it looks like
http://WEBSITE/SOMERELATIVEPATH/favicon.ico
which is the absolute path to the favicon. If you didn't find it this way, it can be as well in the root in which case the URL is http://WEBSITE/favicon.ico.
2. Take the URL you determined and insert it into the href-Parameter of the following code:
<html>
<head>
<title>Capture Favicon</title>
</head>
<body>
<a href='http://WEBSITE/SOMERELATIVEPATH/favicon.ico' alt="Favicon"/>Favicon</a>
</body>
</html>
3. Save this HTML code locally (e.g. on your desktop) as GetFavicon.html and then double-click on it to open it. It will display only a link named Favicon. Right-click on this link and select "Save target as..." to save the Favicon on your local PC - and you're done!
It's a good practice to minimize the number of requests each page needs.
So if you need several icons, yandex can do a sprite of favicons in one query.
Here is an example
http://favicon.yandex.net/favicon/google.com/stackoverflow.com/yandex.net/
The first thing to look for is /favicon.ico in the site root; something like WebClient.DownloadFile() should do fine. However, you can also set the icon in metadata - for SO this is:
<link rel="shortcut icon"
href="http://sstatic.net/stackoverflow/img/favicon.ico">
and note that alternative icons might be available; the "touch" one tends to be bigger and higher res, for example:
<link rel="apple-touch-icon"
href="http://sstatic.net/stackoverflow/img/apple-touch-icon.png">
so you would parse that in either the HTML Agility Pack or XmlDocument (if xhtml) and use WebClient.DownloadFile()
Here's some code I've used to obtain this via the agility pack:
var favicon = "/favicon.ico";
var el=root.SelectSingleNode("/html/head/link[#rel='shortcut icon' and #href]");
if (el != null) favicon = el.Attributes["href"].Value;
Note the icon is theirs, not yours.
In 2020, using duckduckgo.com's service from the CLI
curl -v https://icons.duckduckgo.com/ip2/<website>.ico > favicon.ico
Example
curl -v https://icons.duckduckgo.com/ip2/www.cdc.gov.ico > favicon.ico
You can get the favicon URL from the website's HTML.
Here is the favicon element:
<link rel="icon" type="image/png" href="/someimage.png" />
You should use a regular expression here. If no tag found, look for favicon.ico in the site root directory. If nothing found, the site does not have a favicon.
HttpWebRequest w = (HttpWebRequest)HttpWebRequest.Create("http://stackoverflow.com/favicon.ico");
w.AllowAutoRedirect = true;
HttpWebResponse r = (HttpWebResponse)w.GetResponse();
System.Drawing.Image ico;
using (Stream s = r.GetResponseStream())
{
ico = System.Drawing.Image.FromStream(s);
}
ico.Save("favicon.ico");
Sometimes we can't get the favicon image with the purposed solution as some websites use .png or other image extensions. Here is the working solution.
Open your website with a firefox browser.
Right-click on the website and click the "View page info" option from the list.
It will open up a dialog and click on the "Media" tab.
In that tab you will see all the images including favicon.
Select the favicon.ico image or click through the images to see which image is used as favicon. Some websites use .png images as well.
Then click on the "Save As" button and you should be good to go.
thanks!
This is a late answer, but for completeness: it is difficult to get even close to fetching 90% all favicons.
A while ago I wrote a WordPress plugin which attempts to get closer to 100%.
This is how it works:
It starts by searching existing favicon repositories such as Google favicons and GetFavicons for the favicon.
If none of them returns an icon, the plugin attempts to get the icon itself. This involves traversing several pages on the domain.
The plugin then inspects the physical image file, because on some servers files get returned with the incorrect mime types.
The code is still not perfect because in the details you will find many weird situations: people have wrongly coded paths, e.g. img/favicon.ico where img is not in the root, duplicate headers in HTML output, different server responses from the head and body etc.
The core of the fetching part is here so you can reverse-engineer it, but be aware that validating the response should be done (checking image filetype, mime etc.).
The SHGetFileInfo (Check pinvoke.net for the signature) lets you retrieve a small or large icon, just as if you were dealing with a file/folder/Shell item.
http://realfavicongenerator.net/favicon_checker?site=http://stackoverflow.com gives you favicon analysis stating which favicons are present in what size. You can process the page information to see which is the best quality favicon, and append it's filename to the URL to get it.
You can use Getfv.co :
To retrieve a favicon you can hotlink it at... http://g.etfv.co/[URL]
Example for this page : http://g.etfv.co/https://stackoverflow.com/questions/5119041/how-can-i-get-a-web-sites-favicon
Download content and let's go !
Edit :
Getfv.co and fvicon.com look dead. If you want I found a non free alternative : grabicon.com.
Using jquery
var favicon = $("link[rel='shortcut icon']").attr("href") ||
$("link[rel='icon']").attr("href") || "";