.NET/ASP.NET/C#/VB.NET PDF Document SDK

In this example, you first load up the RubyGems library, and then load up the RedCloth library with require. When RubyGems is loaded on the first line, the RubyGems library overrides the require method and enables it to be used to load gems as if they were normal, local libraries. After that point, you can use the RedCloth library, create an object, and call a method on that object. If you get the HTML as output, everything was a success. You ve used your first gem.

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Note The one-click installer used by Windows users to install Ruby and RubyGems makes it so that

This book began with the example of a headline-making BBP presentation used in a courtroom in 1, and it s worth taking a quick peek under the hood to see what made the rst slides of that presentation work so well. Although you might not

RubyGems is loaded by default with all Ruby programs run on that machine, so require 'rubygems' isn t required, although it does no harm either way.

You can supply a namespace with eval, just as with exec, although expressions rarely rebind variables in the way statements usually do. (In fact, you can supply eval with two namespaces, one global and one local. The global one must be a dictionary, but the local one may be any mapping.)

Let s look at a second example of installing a gem to see the realities of installing more complex gems. Hpricot is an HTML/Web page processing library for Ruby that uses a parser written in C for speed. This requires the C code to be compiled, and although C compilers are commonly available on Unix/Linux and Mac OS X machines, they re less common on Windows machines. This demands that two versions of each release of the Hpricot gem are made available: one for machines that can compile the C code, and one for Windows machines with a precompiled version.

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Note You ll use Hpricot in 14 to process Web page content, so installing Hpricot now is advised if

You can start by installing the Hpricot gem in the usual fashion:

present the opening statement in a trial, when you explore the thought process behind this example, think of how you will write your own clear and concise words in Act I of your story template and apply equally effective yet simple visual techniques to your own storyboard.

Attempting local installation of 'hpricot' Local gem file not found: hpricot*.gem Attempting remote installation of 'hpricot' Updating Gem source index for: http://gems.rubyforge.org Select which gem to install for your platform (i686-darwin8.8.1) 1. hpricot 0.4 (ruby) 2. hpricot 0.4 (mswin32) 3. Cancel installation >

Caution Even though expressions don t rebind variables as a rule, they certainly can (for example by

Rather than just going ahead and installing the gem, the gem client notifies you that there are two different types of gems available of the Hpricot 0.4 gem. One version is marked ruby and the other mswin32. The ruby gem is a generic gem that s designed to be installed on any machine that has a Unix-like environment and a C compiler available (this can include Cygwin, a Unix line environment for Windows). The mswin32 version is specifically designed for users using Ruby under a pure Windows environment, and includes a precompiled binary version of the HTML parser for use on a 32-bit x86 Windows environment. You select your choice by typing the number required and pressing Enter. Once Hpricot is installed, it s easy to check if everything went okay: