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Figure 3-6. The MacPorts Project web site Installing MacPorts page The first bullet point on this page has links to three binary DMG image files, one each for the Snow Leopard (10.6), Leopard (10.5), Tiger (10.4), and Panther (10.3) versions of Mac OS X. Simply click the relevant link for the version of the operating system installed on your Mac, and the download will start. Unlike Xcode, MacPorts is a very lightweight piece of software (the current version at the time of writing, 1.7.1, weighed in at 415 kilobytes when I downloaded it). As soon as it has downloaded, the disk image will mount, and the installation application should open immediately. When the installer starts, you will be informed that the package contains a program that determines whether the software can be installed, and it will ask whether you are sure that you want to continue. Simply click the Continue button to close this message, and you will be brought to the MacPorts installer, which should look similar to Figure 3-7.

bottom of any listings page in the iTunes Wi-Fi Music Store application. There, you ll find the active account name and a link to the iTunes Store terms and conditions page.

Appendix B contains walkthroughs for configuring these tools and getting them up and running in a few minutes. We ll end our discussion of debugging by returning to code. If debuggers do their best to help developers spot errors, we should ask what we can do as programmers to make debugging code easier. A good practice is to always raise meaningful and well-documented errors, as we ll explain in the next section.

Figure 3-7. Welcome to the MacPorts installer When this window appears, click the Continue button to move to the next part of the installation, which gives you information about MacPorts, its requirements, where it will be installed, and how to use it. Click Continue to skip forward to the next section. On the Software License Agreement screen, click Continue to bring up the confirmation dialog box asking you to agree to the terms of the software license agreement. If you like, read the license, and when you re ready, click the Agree button to continue with the installation. I don t recommend changing the installation target location, but if you feel the need to do so, you can click the Change Install Location button on the next screen to change it. Otherwise, just hit Install, and the installation procedure will commence. As with Xcode, you will now be asked for your Mac OS X system password. Enter it, if you have one, and click OK to start the install. The entire process should only take a couple of minutes to complete. When it is finished, you should see a message like the one in Figure 3-8.

If you have more than one iTunes account, you cannot use both. The iPod can sync to one account or another, but not two at once. This is unfortunate. I know many people who have iTunes accounts for different countries (say both US and Japanese accounts) or separate accounts for husband and wife. They cannot switch between these two accounts until they physically return to their computers.

In the .NET framework, you can raise either built-in or custom errors by leveraging the Exception class. For example, if you try to access an element beyond the bounds of an array, an exception of type IndexOutOfBoundsException is thrown at runtime. The purpose of this and the other typed exceptions is to carry information about the errors that occur at runtime. To work with and detect exceptions, a programming language usually provides a special construct. For example, C# and VB.NET let you wrap a portion of code in a try-catch block. The catch block detects exceptions that are raised in the code encapsulated in the try block. On the client side, JavaScript supports the try-catch construct and uses the built-in Error object as the base type to provide information about errors that occur at runtime. The Microsoft Ajax Library extends the Error object to make it possible to create typed exceptions on the client side. For example, to signal that a function lacks an implementation, you do the following: