Switching Operating Systems

Yes I am still alive. I know I haven't updated the Blog since after my exam, but I was, erm, too busy "celebrating" the end of my exams :).

Anyway, so I was trying to reinstall Windows 7 yesterday, but I found out that my DVD Reader didn't work. This was the second DVD Reader, in fact, the first one was a BD reader as well. Anyway, it didn't read the DVDs so I had to improvise. This meant trying to run the installer from a USB, however, I didn't have a USB that was big enough to hold Windows 7. So tried to run it from an external hard disk, which ultimately lead to the demise of my master boot record. I wasn't really too fussed because I had already backed up everything :).

So then I decided to just switch to Ubuntu straight away, which means running some of my favourite applications on Linux using Wine, and oh what an amazing job the talented developers of the Wine project have done.

I remember about two years ago, I tried to install the old version of Steam (way before the UI revamp and the Mac version), and in all fairness, I gave up on using it within 10 minutes. It was too sluggish, and had to install loads of random stuff before it could work. It was a lengthy process.
Now though, I just downloaded the installer, marked it as executable, and double clicked it. A few clicks later, it was updating and straight away after the update I could login. No fuss, no problem. After I logged in, Steam guard came up as expected, and after verifying everything worked fine. I can use the chat normally, currently installing Portal 2 (not sure how that's going to go), and after being impressed this much, I think it will run fine.

I also installed my favourite PHP IDE on Wine, phpDesigner, I haven't really tested it too much, however, I noticed that the original php.exe included didn't work properly, had to manually download the VC6 version and use that instead. I haven't tested Xdebug yet, but I will soon.

I'll keep you updated on Portal 2 and phpDesigner.

Hosh

Last exam tomorrow.

Finally getting to the final exam tomorrow, software engineering! This time tomorrow I will be free from free from the exams! More updates on random stuff soon! :)

I've got 4 exams in a row, don't expect too many posts till after Saturday

Title says it all, I won't be posting much till after Saturday. I have 4 exams in a row so I am going to need every second of revision I can get.
For the curious ones, I have exams on

• Wednesday - Functional Programming
  Learning Haskell using Heath (a program created at our University) and Hugs
• Thursday - Cognitive Neural Networks
  About how the human brain sees stuff and how we can simulate this on a computer.
• Friday - Algorithms, Data Structures and Complexity
  About how all sorts of algorithms work such as sorting algorithms etc.
• Saturday - Software Engineering Practice
  Best practices to develop software.

Not much to it hopefully, plus I've already passed Functional Programming and only need 51% to get a first! Sounds doable :).

Anyway, see you after the exams.

Hosh

Downloading a file from a remote server using cURL

I am currently implementing a new way for themes to be submitted on PS3 Themes. Allowing users to select a remote P3T file and it will be downloaded. There is multiple ways of doing this, but the simplest method is using cURL. The cURL options you will need are CURLOPT_TIMEOUT, CURLOPT_FILE and CURLOPT_FOLLOWLOCATION and you will need the function fopen(). So here goes.

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1. <?php
3. set_time_limit(0);
5. $f = fopen('theme_name.p3t', 'w+'); // Initiate a file writer for the downloaded file to be written to.
7. $d = curl_init('http://www.example.com/theme_name.p3t'); // initiate cURL on the file to download
9. // set the appropriate options
10. curl_setopt($d, CURLOPT_TIMEOUT, 60); // set the time out time for the cURL operation, the bigger the file, the bigger this number should be
11. curl_setopt($d, CURLOPT_FILE, $f); // this is where you need the file handle, it will put everything straight handle
12. curl_setopt($d, CURLOPT_FOLLOWLOCATION, true); // this is just so all redirects are actually, otherwise might get the wrong page.
14. // Execute cURL, this will set it
15. curl_exec($d);
17. // close both the file handle and the cURL
18. curl_close($d);
19. fclose($f);
21. ?>

The code is fairly straight forward, and if not, the comments should help.

Hosh

The art of reinstalling Operating Systems

Well, there is no art to to much of an art to it, but it has to be done every now and then.
My current Windows 7 installation would be turning 1 year soon. Yes it does happen, Windows can run great without having to reinstall every week. Anyway, there is too much junk on it, so it requires a new installation, plus I was thinking of installing Ubuntu 11.04 after seeing how much it has been improved since 10.04. The new Unity looks just too awesome to miss out on.
I am currently backing up everything and should soon be reinstalling it.

Hosh

Portfolio done

For those interested in looking at it, it is available at http://hosh.me.uk/. There are some other sites on there, including my PS3 Themes website, they are all written by me from scratch. If anyone wants to code of the websites (except for PS3 Themes) drop me an email, and I'll be more than happy to provide you with the code.

Hosh

I got a Job interview.

I got a job interview soon for my placement year. I am looking forward to this interview and will hopefully do well in it. I am currently developing a quick portfolio website in the hopes of impressing them even more :), and you never know, maybe the portfolio will be the decider. Every little helps, no?

Anyway, the portfolio should be only before Monday, as that is when my interview is. Till then, I got another exam tomorrow, about Database Systems, so it's going to be fun... Not. Either way, I will need to revise till tomorrow. After the exam, I got 1 hour and 30 minutes to kill, perfect opportunity to finish the design at the very least. Then some sort of talk the University is having. Sounds like a fun day, maybe I'll fall asleep during the lecture, that would give me a good buzz :).

Anyway, I'm getting back to revision and/or finishing my portfolio site.

Hosh

Exam tomorrow, let's talk about reading raw pixels to use with GD

I have an exam tomorrow about Distributed Systems and Networks. So what is the best way to spend our time right now? That's right, don't revise and talk about an old problem I had while implementing a script.

So while creating the P3T extractor for PS3 Themes in PHP, I was using PHP's GD functionality to read extracted .gim images, which are basically images that contain raw pixel data, in RGBA format, each 8bits.
Now, RGB was all fine, but the Alpha channel was not so much. Any GD user, who has created images with alpha transparency knows that PHP's imagecolorallocatealpha() function requires a alpha channel of up to 127. this means 7 bits.


But that is not all. Imagecolorallocatealpha() alpha argument sees the alpha argument as 0 being completely opaque, and 127 completely transparent, however, this was exactly the opposite as to a .gim file, where 0 was completely transparent, and 255 was completely opaque.

How do we solve this?
Well, any mathematician would probably see the problem straight away, however, it is a bit more trickier when you would have to figure out how the data is saved. Anyway, after figuring that out, I decided to tackle this problem by taking the extracted data, removing 255 from that, and removing the minus sign (abs(), substr($negative_int, 1) or *-1), and then bit shifting this to the right once.

I settled on the substr() method in the beginning, but later decided to go with the abs() function as this made the code more presentable.

I posted the substr() method on PHP's website (found here), but the abs() function makes this much neater.
This is the code:

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1. <?php
3. $alpha = abs($alpha - 255) >> 1;
5. ?>

Of course in this case, $alpha is an int between 0 and 255 (as it is saved like that in .gim files).
Results, if $alpha = 255, $alpha will be 0.

Hosh

Hellow World

So this is my first post on this Blog, I will hopefully post random stuff about me, and mainly my developing skills. Give you quick tips about programming etc.

Hope you guys will enjoy your stay!

PS: no the title is not a typo :)