Mac OS X Leopard - ARCAism

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486 CHAPTER 26 MAC OS X DEVELOPMENT: OBJECTIVE-C NOTE This section discusses the traditional Objective-C model for manual memory management. Although it is still valid and useful information, Leopard introduces an alternative: automatic memory management, also known as garbage collection. You can read more about garbage collection in the “Objective-C 2.0” section. To ameliorate this risk, Objective-C uses a system called retain counting. Retain counting is extremely simple, at least in concept. Every object that subclasses NSObject has an instance variable called retainCount. When an object is created by alloc or copy, retainCount is initialized to 1. Anyone interested in the object sends it a retain message, which increments retainCount. Anyone no longer interested in the object sends it a release message. When retainCount reaches 0, the object is freed, as shown in Figure 26-2. Figure 26-1. The risk of malloc/free in object- Figure 26-2. Retain counting lets objects be oriented programming shared safely. If everyone remembers to retain and release at the appropriate times, this system works perfectly, except for one little problem. What happens if you create an object and then pass it to someone else, as illustrated in Figure 26-3? The caller can’t retain the object until after you return it. If you release it before you return it, the retain count will drop to zero, and the object will be freed. If you return it without releasing it, the retain count will never drop to zero, and the memory will leak! The solution to this problem is to let a third party retain the object, as shown in Figure 26-4. That way, the object will not be freed until both the caller and the third party release it. This is accomplished by sending the object an autorelease message. The system will then place the object into an autorelease pool. The autorelease pool will keep track of objects on request and then send them the release message at the bottom of the event loop. If everyone has released an object before the autorelease pool has released it, the end result is the same. The object will be freed when the autorelease pool releases it. However, if a lot of objects are created and released, as in a long loop, the programmer may need to create an inner autorelease pool and drain it manually. This is easily done; autorelease pools are objects that are instances of NSAutoreleasePool.
Figure 26-3. It is impossible to safely return a new object using retain counts alone. Figure 26-4. An autorelease pool allows safe object creation. CHAPTER 26 MAC OS X DEVELOPMENT: OBJECTIVE-C 487
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Mac OS X Leopard: Beyond the Manual
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PART 5 Getting to Know Darwin CHAPT
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viii CONTENTS CHAPTER 2 The File Sy
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x CONTENTS CHAPTER 7 Managing Appli
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xii CONTENTS CHAPTER 12 Address Boo
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xiv CONTENTS CHAPTER 16 iLife ’08
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xvi CONTENTS CHAPTER 21 Port Forwar
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xviii CONTENTS CHAPTER 25 Quick Loo
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xx CONTENTS Running Microsoft Windo
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xxii Acknowledgments First of all,
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Getting to Know Leopard PART 1
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4 CHAPTER 1 WORKING IN LEOPARD: THE
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10 CHAPTER 1 WORKING IN LEOPARD: TH
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28 CHAPTER 2 THE FILE SYSTEM Figure
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30 CHAPTER 2 THE FILE SYSTEM Table
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32 CHAPTER 2 THE FILE SYSTEM Table
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34 CHAPTER 2 THE FILE SYSTEM While
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36 CHAPTER 2 THE FILE SYSTEM Hidden
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38 CHAPTER 3 USING SPOTLIGHT, EXPOS
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System Preferences Many of the conf
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Option Description Click in the scr
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Table 4-2. Desktop Image Aspect Sel
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Dock The Dock preference pane (Figu
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CHAPTER 4 SYSTEM PREFERENCES 59 Fig
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Figure 4-11. The Input Menu tab in
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Figure 4-13. The Spotlight preferen
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Figure 4-16. The Display tab of the
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NOTE As you may have noticed, click
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Figure 4-22. When you have multiple
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The Options tab (Figure 4-25) provi
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Figure 4-26. The Keyboard tab in th
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Figure 4-28. The Mouse tab on the K
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Processor When you install the Xcod
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Internet & Network The next section
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Selecting Login Options (Figure 4-3
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This window requires some basic inf
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Figure 4-44. The Time Zone tab in t
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Figure 4-47. The Simple Finder The
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Figure 4-49. The Mail & iChat tab o
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Figure 4-52. The Software Update pr
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The Text to Speech tab (Figure 4-55
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Figure 4-57. The Seeing tab of the
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Figure 4-60. The Keyboard tab provi
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Today more and more features are bu
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At this point, you may be skeptical
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CHAPTER 5 CONNECTING PERIPHERALS TO
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CHAPTER 5 CONNECTING PERIPHERALS TO
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Figure 5-7. The printer Options she
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Connecting Bluetooth Devices Blueto
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The Bluetooth Setup Assistant will
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Figure 5-18. Finished successfully!
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CAUTION To eject media in Leopard,
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Connecting Other Peripherals Beside
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The Ink preference pane (Figure 5-2
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122 CHAPTER 6 COMMON LEOPARD MAINTE
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136 CHAPTER 7 BACKUP, SYNCHRONIZATI
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144 CHAPTER 8 LEOPARD SECURITY •
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146 CHAPTER 8 LEOPARD SECURITY NOTE
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148 CHAPTER 8 LEOPARD SECURITY Figu
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150 CHAPTER 8 LEOPARD SECURITY Figu
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152 CHAPTER 8 LEOPARD SECURITY •
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154 CHAPTER 8 LEOPARD SECURITY Summ
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Connecting to the Internet One of t
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Usually those three steps should ge
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NOTE One application notably missin
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Technology Description CHAPTER 9 CO
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Making an Ethernet Connection CHAPT
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Figure 9-7. A PPPoE connection work
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LEAP: Lightweight Extensible Authen
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Browsing the Web with Safari Leopar
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Figure 10-2. You can customize your
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Menu/Submenu Item Keyboard Shortcut
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Figure 10-4. All of your bookmarks,
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Figure 10-6. Safari running with ma
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CHAPTER 10 BROWSING THE WEB WITH SA
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Figure 10-10. The AutoFill options
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Private Browsing Another way to pro
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RSS Feeds in Safari RSS (Really Sim
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On the right side of the view area
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Figure 10-16. Selecting a region in
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Mail, Address Book, and iCal Mail T
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Item Keyboard Shortcut Description
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Figure 11-2. The first step in addi
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CHAPTER 11 MAIL, ADDRESS BOOK, AND
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When you select a message, its cont
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Creating Mail Rules CHAPTER 11 MAIL
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Figure 11-11. Mail will open a shee
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Using Mail Stationery The Mail appl
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Figure 11-14. Leopard’s Address B
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Creating Groups You might want to c
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Figure 11-17. iCal in Leopard (Week
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Adding Time Zone Support iCal has a
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iChat Instant messaging has been ga
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Figure 12-2. The Account Setup shee
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NOTE For more options, see the “C
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Ironically, the IM central server a
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For best results, select an even, n
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NOTE The Share My Screen... and Ask
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• Collect chats into a single win
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Figure 12-14. Tabbed chat helps you
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Working with Applications PART 4
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248 CHAPTER 13 APPLICATION BASICS S
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250 CHAPTER 13 APPLICATION BASICS F
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252 CHAPTER 13 APPLICATION BASICS F
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254 CHAPTER 13 APPLICATION BASICS T
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256 CHAPTER 14 APPLE APPS INCLUDED
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266 CHAPTER 15 .MAC NOTE You can al
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268 CHAPTER 15 .MAC iDisk Another f
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iLife ’08 Apple’s iLife ’08 i
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NOTE iPhoto keeps track of all your
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Figure 16-3. iMovie ’08 and its n
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Figure 16-5. Building a Welcome pag
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New in GarageBand ’08 is a featur
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iWork ’08 Apple has been producin
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One great feature of Keynote is tha
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Figure 17-4. A Pages document in Pa
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Getting to Know Darwin PART 5
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290 CHAPTER 18 INTRODUCING DARWIN A
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330 CHAPTER 19 EXTENDING THE POWER
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Leopard Networking The Mac is known
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Selecting Always Allow will add the
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You can also use Little Snitch to s
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theory behind Ping is that any mach
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So, while Network Utility is a good
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Apple includes a second utility for
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Figure 20-11. Setting up port forwa
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366 CHAPTER 21 WORKING WITH REMOTE
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Leopard As a Web Server There are s
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Figure 22-3. The Networking pane of
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If you’re developing web content,
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VirtualHost If you’ve got a web s
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What makes this directive interesti
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all that stuff is now handled autom
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Figure 22-7. The MySQL pane in Syst
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Domain Name Tricks Were you so incl
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PART Leopard Development and Script
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402 CHAPTER 23 MAC OS X AUTOMATION
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What is it about the Mac that makes
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Figure 24-2. Cocoa components in In
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Figure 24-3. Core Data modeling in
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Not so fast! CHAPTER 24 MAC OS X DE
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Figure 24-6. Address Book’s Peopl
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CHAPTER 24 MAC OS X DEVELOPMENT: TH
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Publication Subscription Syndicatio
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Page 549: Appendixes
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536 APPENDIX A WHAT’S NEW WITH LE
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544 APPENDIX B INSTALLING MAC OS X
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Index Symbols and Numerics # (hash)
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alloc method, Objective-C, 483, 492
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Attach File command, Mail, 199 atta
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CalDAV standard, 430 iCal and, 227
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emote computing by Secure Shell in
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digital cameras connecting, 117-118
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saving text, 318, 319 searching tex
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filters Core Image filters, 439 Ima
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ftps (FTP Secure), 367 function key
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Instant Message framework, 431 inte
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IP addresses, 163 configuring Mac f
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list (port list) command, MacPorts,
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memory management, Objective-C, 482
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New Message window, Mail, 217 New N
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password sheet creating keychains a
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opening, 106 Supply Levels tab, 106
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unning PowerPC code, 518 Rotate too
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Services option, Mail, 198 set comm
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Spotlight Comments section, Info wi
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identifying differences in document
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users running commands, 303 who els
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Window items, Safari, 178 Window me
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Mac OS X Leopard - ARCAism

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