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18.4.4 Expanding on this example This was one of our longer examples, but it could still bear some expansion to turn it into a fully featured application. First, it s a little unfriendly with memory. It d probably be better to maintain references to filenames, rather than keeping the UIImages around. In addition, the NSArray that the CALayer is drawn from should be saved out to a file, so that it wouldn t get lost if memory is low. But the program as it exists should work fine. The program could be made more usable. An option to crop the pictures would be nice, but it would probably require access to Core Graphics functions. An option to move pictures around after they ve been locked in would be relatively simple: you could test for touches in the collageView, and read backward through the NSArray to find which object the user was touching. Reinstantiating it as a UIImageView would then be simple. In any case, you ve seen how all of these pictorial fundamentals work together, so we re now ready to move on to the next major types of media: audio and video.

You are an IT professional for a company that provides equipment for home and small business users. Your company s customer installations typically consist of between four and eight workstations configured as a workgroup. Your company has recently been supplying workstations that run Windows Vista, and you have been asked to give advice about UAC. Answer the following questions: 1. Don Hall, the Chief Executive of Margie s Travel, is not convinced about UAC. He wants to know why he, as an administrator, needs to click Continue every time he wants to perform an administrator-level task. What do you tell him 2. Don is unconvinced. As an administrator he wants to be able to perform all tasks without prompting. What setting can he change to accomplish this with the least impact on network security 3. Don does not want any users logged on with standard accounts to be able to change configurations that affect any other user. As an IT professional, part of whose job specification is to advise on security, what do you tell him If he insists on reconfiguring UAC, how best can he achieve his objectives with the least impact on network security 4. Don wants to make the minimum number of changes to UAC configuration while assuring that he, as an administrator, is not prompted to give permission while performing administrative tasks while standard users are prohibited from initiating such tasks. How can Don reconfigure UAC to meet this goal, and what warning would you give

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Audio and video both allow for considerably more complexity than images. Fortunately, there s a high-level framework that gives you access to both of them: the Media Player. If you don t need the audio or video to be tightly integrated into the rest of your application, it s a pretty good choice it often works well for video, but it s a somewhat more questionable choice for audio. The Media Player framework includes two classes: MPMoviePlayerController and MPVolumeView. They manage a full-page audio or video player that doesn t give you a lot of control over the specifics of how it works, but it does give you easy access to audio or video files. To use either of these media player classes, you should add the Media Player framework and the MediaPlayer/MediaPlayer.h header file to your project.

As an IT professional providing customer support, you need to advise customers about running legacy programs. Answer the following questions: 1. Kim Ackers wants to prohibit any legacy program that attempts to write to protected registry locations from running. What UAC setting should she configure

2. Don Hall cannot run a legacy program because it needs to run with a full administrator access token. How can he run the program 3. You have a legacy virus protection program that you want to run in Windows Vista. You have read that the Windows Vista Program Compatibility Wizard can help configure legacy software so it can run. Should you use this wizard in this instance If not, why not

18.5.1 The media player class In order to use the media player itself, you need to init an MPMoviePlayerController object with the URL string for the file that you ll be calling up. This may be any .mp3, .mp4, .mov, or .3gp file or anything else supported by the iPhone. You can either start it playing immediately (which will cause the iPhone s wheels to spin for a bit, while it gets ready) or you can wait until you ve received a notification that the file has loaded. There are three notifications that you may wish to pay attention to when using the media player, as described in table 18.4.

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