Computer Programming

Yes, a bit specific, but I need to store some links!

Javascript and Lisp (erm Scheme or Guile)

I was reading up on Guile, figuring I should revisit Scheme annually. Found some examples, and translated them into Javascript.

(lambda (x) (+ x x))

(define add4 (let ((x 4)) (lambda (y) (+ x y))))

(define factorial (x) (if (zerop x) 1 (* x (factorial (- x 1)))))

function(x) { return add(x,x); }

function _defunmaker() { var x=4; return function(y) { return x + y; } }
var add4 = _defunmaker();
_defunmaker = null;

var factorial = function(x) { if (x==0) { return 1; } else { return x * factorial(x-1); }; };

C# and VB.net Comparison

This is a link to an awesome resource: a "rosetta stone" comparing VB and C#. Totally useful as a general reference, too. One of these days, we need columns for PHP, D, C++, Javascript, etc.

http://www.harding.edu/fmccown/vbnet_csharp_comparison.html

Bedrock, Google, and Patent 5893120

A story about Google losing a patent lawsuit against Bedrock, an East Texas "patent troll" has been making the media rounds, but I haven't yet seen an analysis of the patent. All I see is talk about Linux being at risk. If Linux is at risk, so is Windows, and so are the Apple OSs, because there's very little novel about the patent.

Convert DOC and OpenOffice to PDF, from the command line and a watched folder

Most of the information in this post is derived from http://www.tech-faq.com/convert-word-to-pdf.html. It's posted as a service, because the code there needs some editing.

Also, a useful thread about executing OOo macros is at http://www.oooforum.org/forum/viewtopic.phtml?t=2619.

Here's the code to automate the opening and saving of a file as PDF, using Open Office. Paste this into your standard macros.

Iteration Safety

So I was reading the CRM114 documentation, and he notes that CRM is hard to DoS because iterators are designed not to use iteration indices. What an interesting thing to say.

A Demo of Transmitting Passwords Encrypted

This is a demo of a technique to transmit password encrypted. It's not a perfect solution yet, but it's getting there.

Interstitial Ad in jQuery

Normally, you should use canned Javascript or canned PHP modules to implement web features, but sometimes, that can suck. Typically, these products, if they're popular, start to suffer from feature bloat. Such was the case with some code for "interstitials", which are those ads that pop up on some web pages, interrupting your reading. Popups have been around a long time, and the drop-in code is just really huge.

Risks of Web Services to Applications

Increasingly, applications are dependent on external web services.

Data and Input Validation with Filters (PHP 5.2 and up)

For years (and years) we've done data validation in PHP "by hand" either with string functions or with regular expressions. The problem with PHP has been that, well, PHP programmers aren't so great at regexs. Also, unlike Perl, there's no data tainting feature that forces you to validate your inputs before they're used in expressions. (Correction, there is a tainting extension.) The upshot is that a lot of bad data gets through. PHP finally added some data validation function, but it seems like nobody is using them. It still lacks tainting. The former problem, we can address.

Screen Scraper in Perl to Extract Dates and Times

This is something I wrote to learn some of the latest Perl tech to scrape pages. What's cool about this demo script is that it doesn't use regular expressions that much.

Reading Code with GVIM/VIM and ctags

Vim/GVim has great features to make it easy to read C (and PHP and Perl) code.

PHP OOP Links

This is a list of links to articles about OOP in PHP. I need to read up on it. Though I know the OO features (most of them at least) I wanted to read some code.

Formatting Email So It Looks the Same on All the Clients and Browsers

I was having lots of problems with HTML email layouts. After doing some research, I came up with a method to get almost pixel-perfect positioning and sizing. It's not that hard.

Shared Memory Example

Here's one for the noobs (from a noob). This demonstrates the use of shared memory. It's a program that spawns 10 children, and each one gets a special "babytalk" word to say.

BODY ID in HTML

I've never put a ID onto the BODY tag, but here's a situation where it's useful.

Normally, an article has an H1 tag that contains the title for the page.  You do this for SEO reasons, as well as semantics.

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