Cefsharp: getting favicon

[architkshk]

how to get favicon of visited site

[xoarinn]

This isn't an issue related to CefSharp. If you want to learn how to get a favicon from a website, you can search Google for a way, but here's the easiest (taken from this StackOverflow question):

string url = ""; // Replace with your URL
using (WebClient client = new WebClient())
    client.DownloadFile(string.Format("http://getfavicon.appspot.com/{0}", url), "icon.ico");

The site's favicon would then be in a file called "icon.ico," or whatever you decide to rename it.

[perlun]

Good point, @csdevrich. Of course we could add hooks for this in CefSharp also. @asarchit65 - is that what you're after? Please explain your use case more carefully. Closing for now.

[derekantrican]

For anyone looking at this in the future, the method should be updated to this:

string url = ""; // Replace with your URL
using (WebClient client = new WebClient())
    client.DownloadFile(string.Format("http://www.google.com/s2/favicons?domain={0}", url), "icon.ico");

[amaitland]

http://cefsharp.github.io/api/63.0.0/html/M_CefSharp_IDisplayHandler_OnFaviconUrlChange.htm

[changbowen]

Complete class implementing IDisplayHandler to only get the favicon.ico from website root and binding to a WPF Window's icon. For people's reference should they come across this issue in the future.
Might not be the best piece of code... enthusiast coder here.
```C#
class DisplayHandler : IDisplayHandler, INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;

private object _favIcon;

/// <summary>
/// For binding to System.Windows.Window.Icon.
/// </summary>
public object FavIcon {
    get { return _favIcon; }
    set { _favIcon = value; OnPropertyChanged("FavIcon"); }
}

private BitmapDecoder _decoder;
private BitmapDecoder Decoder {
    get => _decoder;
    set {
        if (_decoder != null) _decoder.DownloadCompleted -= decoderDownloadCompleted;
        _decoder = value;
        if (_decoder != null) _decoder.DownloadCompleted += decoderDownloadCompleted;
    }
}

private void decoderDownloadCompleted(object sender, EventArgs e)
{
    FavIcon = Decoder.Frames.OrderBy(f => f.Width).FirstOrDefault();
    Decoder = null;
}

protected void OnPropertyChanged(string propertyName)
{
    if (!Application.Current.Dispatcher.CheckAccess())
        Application.Current.Dispatcher.Invoke(() => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)));
    else PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}



public void OnAddressChanged(IWebBrowser chromiumWebBrowser, AddressChangedEventArgs addressChangedArgs)
{
}

public bool OnAutoResize(IWebBrowser chromiumWebBrowser, IBrowser browser, CefSharp.Structs.Size newSize)
{
    return false;
}

public bool OnConsoleMessage(IWebBrowser chromiumWebBrowser, ConsoleMessageEventArgs consoleMessageArgs)
{
    return false;
}

public void OnFaviconUrlChange(IWebBrowser chromiumWebBrowser, IBrowser browser, IList<string> urls)
{
    var baseUrl = new Uri(browser.MainFrame.Url).GetLeftPart(UriPartial.Authority);
    Application.Current.Dispatcher.Invoke(() =>
    {
        Decoder = BitmapDecoder.Create(new Uri(baseUrl + "/favicon.ico"), BitmapCreateOptions.None, BitmapCacheOption.OnDemand);
    });
}

public void OnFullscreenModeChange(IWebBrowser chromiumWebBrowser, IBrowser browser, bool fullscreen)
{
}

public void OnLoadingProgressChange(IWebBrowser chromiumWebBrowser, IBrowser browser, double progress)
{
}

public void OnStatusMessage(IWebBrowser chromiumWebBrowser, StatusMessageEventArgs statusMessageArgs)
{
}

public void OnTitleChanged(IWebBrowser chromiumWebBrowser, TitleChangedEventArgs titleChangedArgs)
{
}

public bool OnTooltipChanged(IWebBrowser chromiumWebBrowser, ref string text)
{
    return false;
}

}

And the Window.xaml:
```XAML
<Window ...
    Icon="{Binding ElementName=Browser_DisplayHandler, Mode=OneWay, Path=FavIcon, TargetNullValue=browser.ico}">
    <wpf:ChromiumWebBrowser>
            <wpf:ChromiumWebBrowser.DisplayHandler>
                <local:DisplayHandler x:Name="Browser_DisplayHandler"/>
            </wpf:ChromiumWebBrowser.DisplayHandler>
    </wpf:ChromiumWebBrowser>
</Window>