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Data URI scheme for embedded image support

Thread ID:





96721 Sep 30,2010 04:29 PM UTC Oct 7,2010 03:51 AM UTC WinForms 3
Tags: HTMLUIControl
Joel McIntyre
Asked On September 30, 2010 04:29 PM UTC

I'm converting some app report generation and display code from the Xul/Skybound.Gecko (Firefox) library to HTMLUi.

The XUL code used embedded images via the 'data:' Uri. It would be very nice if HTMLUi could support this in future versions; or if it already supports this, is something I need to do differently?

Thank you!

Here are the details I was able to find on the 'data:' method:


Working tags look like:

Red dot

Our C# code build or loaded an image and embedded that in the html report with the extension method:

public static string EmbeddedHtml(this Image image)
string Template = @"";

MemoryStream stream = new MemoryStream();
image.Save(stream, ImageFormat.Png);
return string.Format(Template, Convert.ToBase64String(stream.GetBuffer()));

Joel McIntyre
Replied On September 30, 2010 06:46 PM UTC

And I was able to roll my own embedded image conversion with some tweaking. I had to change embedded format above from "data:..., " to "data|" (substituting the colon and dropping the encodings), and then hooking PreRenderDocument and iterating through all images like the abbreviated error-checking-absent code below.

If there is an easier, more supported method, or more standardized method, please do let me know! And if you accept the "data:" feature, I am still interested - better a portable format.

Hope this helps the rest of y'all! Cheers.

void control_PreRenderDocument(object sender, PreRenderDocumentArgs e)

void LoadInlineImages(InputHTML Document)
Hashtable elements = Document.ElementsByTagName;
if (elements != null)
ArrayList imagelist = elements["img"] as ArrayList;
if (imagelist != null)
foreach (IMGElementImpl image in imagelist.OfType())
Bitmap graphic = GetImageByName(image.Attributes["src"].Value);

if (graphic != null)
image.Image = graphic;


Bitmap LoadDataImage(string Name)
string Base64 = Name.Substring(Name.IndexOf("|") + 1).TrimStart();
byte[] Data = Convert.FromBase64String(Base64);
return Image.FromStream(new MemoryStream(Data)) as Bitmap;

Joel McIntyre
Replied On September 30, 2010 06:54 PM UTC

// Missed a layer:

Bitmap GetImageByName(Name)
if (Name.StartsWith("data|")
return LoadDataImage(Name);
return null; // or do other types of image loads

Vallarasu S [Syncfusion]
Replied On October 7, 2010 03:51 AM UTC

Hi Joel,

Thanks for your interest in Syncfusion products,

We regret to say that we don’t have plans to implement this as a feature in HTMLUI, You can continue using the PreRenderDocument event for such requirements.

Please let us know if you have concerns on this.

Vallarasu S.


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