A simple way to speed up your iPhone web app
June 22nd, 2008 @ 12:04 Comments Off
Reduce the size of each component to 25 Kbytes or less for optimal caching behavior
[Link]
Filed under: Web development, Apple, iphone
Gort! Klaatu barada nikto!
June 14th, 2008 @ 23:57 comments(0)
Here’s a fun easter egg in Firefox 3. Type about:robots into the url bar and you get a fun response. I love robots, and one day I would like to be one.
The Non-Expert
May 16th, 2008 @ 12:30 Comments Off
Experts answer what they know. The Non-Expert answers anything
[Link]
Filed under: quotes
More fun with QR Codes and the BBC logo
March 12th, 2008 @ 22:38 comments(10)
After what has been the most strange of days, I thought I’d write a little bit more on the QR Code work I have been doing for /programmes. This is a bit of a sneak preview, as the work will not be pushed out live for a little while as we try and fix a potential bit of memory corruption found in one of the binaries we were using.
So, I mentioned in a post not long ago that I had been working with QR Codes, and that I wanted to extend the current offering we have, which is just basically a simple implementation of a clever Japanese guys JavaScript library. I was also interested in the embedding of images in QR Codes, as displayed on the wikipedia page. This is possible due to the Reed-Solomon error correction code written into the QR Code encoder. This allows up to 30% deterioration of a QR Code possible with it still being readable.
So armed with that knowledge, and a bit of tinkering in Photoshop, we came managed to come up with a solution that was still readable by a QR Code reader and also incorporated the BBC logo in a clearly readable form. I think you’ll agree, it came out quite nice? We were quite lucky as the simple geometry of the BBC logo was ideal. 
The next thing was to coderize (patent pending) our Photoshop mock up. I had a few choices, I could use Image software to merge the logo and the QR Code, I could write the logo first and the write out the QR Code data around it (this would be the ideal solution to be honest), but I adopted for, reduce the Image to be 1:1 pixel:data ratio, adjust the logo so it fitted, then create a matrix of the logo data. This way I had a kind of BBC logo blueprint I could scale up to whatever size the QR Code image needed to rendered at. Below is the matrix based on a min image size in pixels of 39×39.
It was then just a matter of drawing this information over the top of the QR Code image information and writing out the file, which as it turns out, does not appear very CPU intensive, as it’s a simple image construct, that along with the Squid caching we have in place means the server load is minimal.
So what we’ve ended up with is below. I’m really pleased with the results and look forward to the code going live.
Oh and for the benefit of people who don’t have access to one of the many free QR Code readers for mobile phones, the logo above decodes to bbc.co.uk/programmes
[Update] Just got a nice mention on the 2-d code magazine site. Also, good to see other people are liking the work.
Filed under: BBC, Experiments, qrcodes
iphone simulator seems to send the wrong user agent
March 7th, 2008 @ 13:40 comments(3)
The new iphone simulator (part of the iphone SDK) doesn’t seem to send the same User-Agent as a normal iphone, so any sites that use content-negotiation don’t appear on it. I would have thought it should send ‘(iPhone; U; CPU like Mac OS X; en)’ but instead it sends ‘Aspen Simulator; U; Apsen 1_2 like Mac OSX:en_us’. This seems like an oversight? What do you reckon?
Filed under: Apple
rQRCode, a Ruby library for encoding QR Codes
February 24th, 2008 @ 15:37 comments(8)
[Update]
I have also posted a bit more about the upcoming QR Code work for BBC /programmes.
We implemented QR Codes on /programmes (A project I’m one of the Software Engineer’s on, at the BBC) a few weeks back. They’ve been talked about since so I won’t repeat things, only to say it was a simple implementation using a JavaScript library by Kazuhiko Arase and took all of 5 minutes of my lunch hour to add. It started as an email by colleague Michael Smethhurst asking if we could/should implement them, and was also the first I had really heard of them.
Since then, I have done lots more research and think there is great mileage there for promotional material and advertising. At the moment the codes are built on the client side, but this will be moved to the server soon so we can start caching the pages, and also so we can provide the code in a more useful format (maybe images instead of the current HTML table).
So to the point of this post. During my research to understand QR Codes more and because of the lack of readable spec (Anyone know if there is one?) I decided to reverse engineer the JavaScript library into a Ruby Gem as there didn’t seem to be one out there. This helped me understand the how QR Codes are encoded, while at the same time giving something back for other people to use.
Anyway, it’s now done and there is a rQRCode Rubyforge project setup. You can also view the rRQRCode documentation (still to be improved) or just jump straight into installing the gem.
A quick simple example in the console:
Also, here is a quick example of using it in a Ruby on Rails project:
So that should get you going. I’m have some interesting features I working on adding so expect lots of updates over the next few weeks. Enjoy!
Hidden session saver in Safari 3.0
October 31st, 2007 @ 12:49 comments(2)
Blimey, this is strange. I haven’t written anything here in a long while. I have meant to as I’ve been doing loads of fun stuff, I just don’t seemed to find time not to do the fun stuff and write about it.
This is a small tip that I find useful and others might. I had always thought that Safari never had a session saver (something I really use in a browser as I always have many tabs open waiting to be looked at). It turns out that in Safari 3.0 this is already in there just slightly hidden away. If you go to the History menu item there are 2 options [ reopen last closed window and reopen all windows from last session ]. It would be nice if you could choose to reopen when the app reopens (maybe you can, anyone know?)
BBC Radio facebook app
June 24th, 2007 @ 13:34 comments(2)
Update It’s now running on it’s own EC2 instance using Apache and Mongrel. So far so good.
I’ve been playing with facebook recently and have built my first app. It simply lets you display your favorite BBC Radio channels in your profile with a link to play and information about who’s currently on. Go install it and let me know what you think.
It’s a rails app that uses the BBC Web API (beta) to find all the schedule information. In order to push all the updated show info to facebook there is a cronjob running that in-turn runs a rake task in my rails app to look for new data. If it finds any it pushes that data to handles within my facebook app’s namespace and each users profiles fetch data from these handles.
It has been a bit of trial and error along the way due to facebooks API being very new; Their documentation being lacking and incorrect at times, and Oh, their crazy session handling. I’m sure these things will be addressed in the future. They use a push system when it comes to showing stuff in people’s profiles. So in order for me to stop making more and more requested to facebook’s server every time a new user, and networks chosen, I’m using the handler approach of sending data about each network to facebook. The users profile then just collects the network info from facebook when it needs them. This means that hopefully the app won’t die the more people use it (saying that it dies already once, but that was out of my control). It’s actually running on one mongrel instance at the moment until I sort out mongrel clusters and apache proxy forwarding. Not ideal but we’ll see what happens.
I can see why the likes of flickr and lastfm have not created crazy apps yet. In fact I don’t see how they can currently. Without posting info about every user up to facebook every few minutes their apps are gonna struggle to be useful.
Hackday imminent
June 14th, 2007 @ 12:44 comments(0)
This weekend is hackday in London. I’m looking forward to it as it will be my first. It’ll be nice to catch up with people I haven’t seen in a while as well as building some fun stuff. We have a whole load of extra music related feeds available on the day which are normally internal, so we’re hoping people are going to build some fun stuff with them.
Show Us Your Gems
February 12th, 2007 @ 16:12 comments(0)
What a good idea. Here’s what I have installed currently:
$ gem list|grep '^[a-zA-Z]'
actionmailer (1.3.3, 1.3.2)
actionpack (1.13.3, 1.13.2)
actionwebservice (1.2.3, 1.2.2)
activerecord (1.15.3, 1.15.2)
activesupport (1.4.2, 1.4.1)
acts_as_versioned (0.2.3)
amazon-ec2 (0.1.0)
builder (2.0.0)
camping (1.5.180)
camping-omnibus (1.5.180)
capistrano (1.99.1, 1.4.1, 1.4.0)
cgi_multipart_eof_fix (2.1)
daemons (1.0.4)
deprec (1.3.1)
fastercsv (1.2.0)
fastthread (0.6.3)
ferret (0.11.2)
flexmock (0.6.1, 0.6.0, 0.5.0)
gem_plugin (0.2.2)
highline (1.2.7)
hoe (1.2.0)
hpricot (0.5)
map_by_method (0.6.0)
markaby (0.5)
metaid (1.0)
mocha (0.4.0)
mongrel (1.0.1)
mysql (2.7)
needle (1.3.0)
net-sftp (1.1.0)
net-ssh (1.1.1, 1.1.0, 1.0.10)
railroad (0.3.3)
rails (1.2.3, 1.2.2)
railsbench (0.9.2)
rake (0.7.2, 0.7.1)
rb-appscript (0.3.0)
RedCloth (3.0.3)
rfacebook (0.6.2)
rmagick (1.15.6, 1.15.2)
rspec (0.8.2, 0.7.5.1)
ruby-openid (1.1.4)
ruby-yadis (0.3.4)
rubyforge (0.4.1)
sources (0.0.1)
sqlite3-ruby (1.1.0.1)
stemmer (1.0.1)
termios (0.9.4)
test-spec (0.3.0)
what_methods (1.0.1)
xml-simple (1.0.10)
Filed under: Ruby
-
My Upcoming.org events Visit my friends