ASP.NET PDF Viewer using C#, VB/NET

When you come to check out, your session ID is used to look up data specific to your session in the session system s data store and find out what you have in your cart To demonstrate basic session storage in your Rails application, you ll count and show a user how many times he or she has accessed actions within your application To do this, you need to have some way of performing this logic on each request made to the application You could add logic to every controller action, but an easier way is to use a filter method called before_filter before_filter is a method you can use at the controller class level to define that a method (or, indeed, many methods) should be executed before the method for the controller action of the current request.

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Filters make it possible to perform generic activities before every request (or before requests to certain groups of methods or to certain controllers)..

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Note A common use for filters within Rails is to make sure visitors are authenticated and authorized to

Listing 2-1. Indexing Example # Print out a date, given year, month, and day as numbers months = [ 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December' ] # A list with one ending for each number from 1 to 31 endings = ['st', 'nd', 'rd'] + 17 * ['th'] \ + ['st', 'nd', 'rd'] + 7 * ['th'] \ + ['st'] year month day = raw_input('Year: ') = raw_input('Month (1-12): ') = raw_input('Day (1-31): ')

visit certain controllers and perform certain actions. If you have a controller class called AdminController, you might want to add a before_filter that ensures a visitor is logged in to the site as an admin user before you let him or her use the potentially dangerous actions within!

The story template serves as a central organizing tool for the entire presentation. It is a visual interface for the structure of your presentation, helping you see the big picture on a single page or two before you commit to adding a visual and verbal track to individual slides. The story template has roots in many sources, including classical philosophy, contemporary media techniques, and the research described in 2. It draws from these inspirations and more and interprets them all through the lens of a process you can use to produce your next presentation.

In this example, you ll use before_filter to perform some logic before every request to the application. To do this, you ll add some code to app/controllers/application.rb, so that every controller in your application (although there is only one in this case, entries) will be subjected to the filter.

Here s app/controllers/application.rb before the new code:

The Greek philosopher Aristotle recorded the classical elements of storytelling 2,400 years ago, including the concept that a story has a beginning, a middle, and an end. When you adapt this timeless idea to your PowerPoint presentations, you will ground your communications in a powerful technique that works.

month_number = int(month) day_number = int(day) # Remember to subtract 1 from month and day to get a correct index month_name = months[month_number-1] ordinal = day + endings[day_number-1] print month_name + ' ' + ordinal + ', ' + year

# Filters added to this controller will be run for all controllers in the # application. # Likewise, all the methods added will be available for all controllers. class ApplicationController < ActionController::Base end

Pay attention to the comments left in default files as they are usually quite informative, as in Tip

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Here s the same file after implementing your request-counting code:

class ApplicationController < ActionController::Base before_filter :count_requests_in_session def count_requests_in_session session[:requests] ||= 0 session[:requests] += 1 end end

Just as you use indexing to access individual elements, you can use slicing to access ranges of elements. You do this by using two indices, separated by a colon: >>> tag = '<a href="http://www.python.org">Python web site</a>' >>> tag[9:30] 'http://www.python.org' >>> tag[32:-4] 'Python web site'