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Generating PDF files from XML source We stated in this chapter s introduction that you could generate binary files such as PDF documents from an XML source. You can use XSL:FO to accomplish this. We do not cover this activity, except to point you toward Ted Neward s excellent paper on how to do this within Ant, X-Power (Neward 2001). Styler a third-party transformation task Although Ant s built-in <xslt> task is sufficient for most purposes, it lacks some features of a LGPL-licensed project called Styler, which lets you build a pipeline of XML transformations and work with alternate input sources, such as HTML or any other format for which you can write a reader. You can find Styler at http://www.langdale.com.au/styler/. We won t cover the <styler> task here, but will point out that its ability to chain together SAX event handlers lets you use Ant to build an XML processing chain, which could find more uses than merely build-time processing. If you need this kind of pipeline, you are into some serious XML hacking, or need to do some HTML scraping as part of your build process. As an aside, there is a working group under way at the W3C on a pipeline processing model for XML, and one of the submissions has actually based its pipeline workflow language on Ant!

Solution to Exercise 17-1. Write a countdown alarm program that uses delegates to notify anyone who is interested that the designated amount of time has passed. You ll need a class to simulate the countdown clock that accepts a message and a number of seconds to wait (supplied by the user). After waiting the appropriate amount of time, the countdown clock should fire off an event and pass the message to any registered observers. (When you re calculating the time to wait, remember that Thread.Sleep( ) takes an argument in milliseconds, and requires a using System. Threading statement.) Create an observer class as well that echoes the received message to the console. The CountDownClock example isn t that much different from the Clock example you saw in the chapter, although it behaves a bit differently. In Tester.Run( ), you ask the user for a string message, and a number of seconds to wait, which you then pass to the instance of CountDownClock. To wait the appropriate number of seconds, you simply use Thread.Sleep(seconds * 1000) so that you re waiting for seconds instead of milliseconds. Once the appropriate amount of time has passed, you check to see whether the event has any subscribers, and then call the delegate. You ll need to create a class that derives from EventArgs to hold the message, and pass that to the delegate. The observer class is relatively simple. It needs to create an event handler that echoes the message to the console, and register that event handler with the delegate. We haven t used the event keyword in this exercise, so this handler is still dangerous.

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The hard-coded option is fine if you really need a fixed query for some special purpose in your application, but sometimes you ll want to create a query based on user input or other current data Fortunately, the NSPredicate class provides an easy way to interpolate values, using the same predicateWithFormat: method you just saw For example:.

Click OK to begin checking in the project files. The progress dialog box is displayed (see figure 2.16). If all goes well, the Framework source files will be stored in the repository. Repeat the commit process for the Windows and web calculator projects.

3. This is by no means the only hash function that could be used, or even a particularly good one. See an algorithms book for information on constructing good hash functions.

sub plot_function { my $function = shift; my $line_type = shift || 0; my $line_width = shift || 4; linetype $line_type; my $moved = 0; for (my $x = $xmin; $x <= $xmax; $x += $delta_x) { my $y = $function->($x); next unless $y >= $ymin && $y <= $ymax; my $hor = $h_offset + ($x - $xmin)/$delta_x; my $ver = $v_offset + ($y - $ymin)/$delta_y; ($moved) && vector($hor, $ver) || move ($hor, $ver), $moved = 1; } }

Question 4-1. What is the difference between the = and == operators Question 4-2. Suppose I have four different variables, a, b, c, and d. What s the shortest way to assign them all the value 36 Question 4-3. What s the difference between dividing two ints and dividing two doubles Question 4-4. What is the purpose of the % operator Question 4-5. What is the output of these operations 4*8 (4 + 8) / (4 2) 4+8/4 2

Attributes are annotations written to convey declarative data from the programmer to other tools or code. That other code might be the runtime environment, a designer, a code-analysis tool, or some other custom tool. You can retrieve attribute information through a process known as reflection. You can write attributes inside square brackets and can place them on classes, members, parameters, and other code elements. Here s an example: [CodeReview("1/1/1999", Comment="Rockin'")] class Test { }

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