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

When you create a custom layout for your Act I slides, change the background color to black and then apply the layout to all of your slides this will hide the headlines, as shown in Figure 9-29. Based on your story template and storyboard sketches, add a text box that reads DNA to the Setting slide (upper left). Animate the word so that when you click the slide, the word DNA slowly fades into the background as you relate the headline DNA is one of the greatest scienti c discoveries of all time. On the Role slide (upper right), add a text box with question marks that fade into the background to intrigue the students as you af rm, In this class, you somehow get to play a role in discovering it for yourself.

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As with Dir.mkdir, you can use absolute pathnames. One thing you need to consider when deleting directories is whether they re empty. If a directory isn t empty, you cannot delete it with a single call to Dir.delete. You need to iterate through each of the subdirectories and files and remove them all first. You can do that iteration with Dir.foreach, looping recursively through the file tree by pushing new directories and files to remove onto an array.

Creating Files in the Temporary Directory Most operating systems have the concept of a temporary directory where temporary files can be stored. Temporary files are those that might be created briefly during a program s execution but aren t a permanent store of information. Dir.tmpdir provides the path to the temporary directory on the current system, although the method is not available by default. To make Dir.tmpdir available it s necessary to use require 'tmpdir':

You can use Dir.tmpdir with File.join to create a platform-independent way of creating a temporary file:

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With so many ways of supplying and receiving parameters, it s easy to get confused. So let me tie it all together with an example. First, let me define some functions: def story(**kwds): return 'Once upon a time, there was a ' \ '%(job)s called %(name)s.' % kwds def power(x, y, *others): if others:

require 'tmpdir' tempfilename = File.join(Dir.tmpdir, "myapp.dat") tempfile = File.new(tempfilename, "w") tempfile.puts "This is only temporary" tempfile.close File.delete(tempfilename)

This code creates a temporary file, writes data to it, and deletes it. Ruby s standard library also includes a library called Tempfile that can create temporary files for you:

On the Point A slide (lower left), duplicate the puzzle pieces so that they ll the screen, change their ll color to black, and then animate the group to fade in when the slide appears and you relate the hidden headline, Without knowing how to approach it, DNA seems like an unsolvable puzzle. On the Point B slide (lower right), add a photograph of a DNA strand from iStockphoto, copy the puzzle pieces from the Point A slide and paste them on top of the photo, and then remove the ll color of the puzzle pieces so that only the puzzle piece outlines remain. As the DNA puzzle appears, relate the Point B headline, You d like to solve the puzzle to discover the big picture. These Point A and Point B slides reinforce the puzzle motif and create a visually interesting framework for the topic the students will address through the class.

Unlike creating and managing your own temporary files, Tempfile automatically deletes the files it creates after they have been used. This is an important consideration when choosing between the two techniques. (There s more information about temporary files and the tempfile library in 16.)

Many applications need to store, access, or manipulate data. In some cases this is by loading files, making changes to them, and outputting data to the screen or back to a file. In many situations, however, a database is required. A database is a system for organizing data on a computer in a systematic way. A database can be as simple as a text file containing data that can be manipulated programmatically by a computer program, or as complex as many gigabytes of data spread across hundreds of dedicated database servers. You can use Ruby in these scenarios and for those in between. First, we re going to look at how to use simple text files as a form of organized data.