Skip to main content

Loading large html pages using Awesomium.NET

Image
By

While there is no limitation in the page size per se, you may experience some weird behavior (errors) when trying to load large html files using the Awesomium WebView LoadHTML method.

I been using this framework for a week now and I’m more than satisfied, it’s a great piece of software, but the error message you get when a large page fails to load, it is a bit confusing “the uri is too long”….

I was working with two files, one of them was large, the other was small, but URL length was the same for both, let say foo.html and bar.html. When I load foo.html things work great, but when I try to load bar.html, boom, I got an error saying that something is wrong with URI’s length? here is where I went “WTF, both URIs have the same length!” ;)

The thing is that the framework internally is using the .NET Uri class which have a limitation of 65K something characters, if the html that you are trying to load exceeds that limitation (not the url, the html) you will get that exception.

Fortunately there is a workaround that works like a charm. Instead of using LoadHTML, you have to make a local copy of the html page and use that copy to set the datasource property on the web view, by doing this, the problem gets fixed :).

The code may look something like this:

Configuring the datasource property

Loading the html

In this post I'm using Awesomium 1.7 RC3, keep in mind that the code above may not work on previous versions.

PS: You can see a full explanation of this behavior at the official Awesomium website on this thread  http://support.awesomium.com/discussions/problems/1027-load-html-in-17-rc2#comment_18672077


Labels:

Comments

Post a Comment

Popular posts from this blog

How to create MS Word documents from Office templates using C#

By
The OpenXML SDK allows you to do pretty much anything you want with office files such as Excel, Word, etc… While many people like this library, I found it complex, unintuitive and poorly documented, not to mention the awful xml format that uses under the hood to represent the documents, styles, etc. So I decided not to use it and build my own solution. If you, like me, don’t like that library, you will find in this post an alternative approach to build word documents from templates using c#.
A neat trick to work with Office is to use the macro recorder to understand how things work. The macro recorder allows you to start a macro, do something by hand, stop it, and then take a look at the generated VBA code. Once you do this, you are pretty much set.
This is how it looks the template I’am going to use.


Note: save the file as a Word template (.dotx)
This is the code to create Word documents from C#:

By running the code, you should get a document that looks like this.


Note that the font, forma…
20 comments
Read more

Printing html using the embedded web browser control

By
In this post I’ll try to answer some questions about the web browser control and provide some workarounds for known issues involved in the printing process.
I'm assuming that you have some experience with the web browser control and basic knowledge of COM and hosting APIs. So I’m not going to cover those topics.
At the bottom of this page I’ve added the links to download a small library I wrote that takes care of printing HTML and a demo app so you can try it out without having to write any code by yourself.
Using the code The HtmlPrinter class will allow you to print html from an URL or just passing the html as string, you can also specify the title and the number of copies you want to print. The code may look something like this: Now that we know how to use the API let get answer some questions.
Why my app crashes when I try to print multiple copies of a page? Well, apparently when you send a lot of print commands to the web browser control, there is a lot of COM crap in between that l…
21 comments
Read more

WinForms, paging the DataGridView the right way

By
I know this may sound like old history, but in the enterprise world there is still a lot of WinForms development. Just a couple of days ago, I had to implement a custom DataGridView capable to work over a butt load of data (100K+ records) and keep responses times acceptables.
I thought paging will be a good way to go, and as WinForms is pretty old nowadays, I supposed it will be easy to find a couple examples on the web.
While in fact I found examples, all of them were incompletes and/or they wouldn't perform well in real world apps... So I decided to roll my own component and post it online. Hopefully, someone else will find it useful ;).


The bread and butter of this solution relies on LINQ and deferred execution. As LINQ takes care of all complicated work, it was quite easy to implement.
This component also supports conditional format, sorting and some search capabilities, but in this post I will concentrate on paging only (I'll cover the rest of the features in future posts)…
8 comments
Read more