Wiley-World.of.Warcraft.Programming.A.Guide.and.Reference.for.Creating.WoW.Addons

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42 Part I ■ Learning to ProgramEmpty ArgumentsTry the following in your interpreter:> print(convert_c2f())stdin:2: attempt to perform arithmetic on local 'celsius' (a nil value)stack traceback:stdin:2: in function 'convert_c2f'stdin:1: in main chunk[C]: ?When no value is passed as an argument, the argument gets the value ofnil. The first line of the convert_c2f function tries to multiply celsius by 1.8and errors out because nil can’t be part of an arithmetic expression. A similarerror will occur if you pass other non-number values into this function.No Return ValuesNot every function you encounter will have a return statement because notall functions need to return anything. The hello() function defined earlierin this chapter is one such example. In these cases any assignments or otherexpressions involving a call to the function will evaluate to nil. Here’s anexample:> function hello() print(“Hello World!“) end> test = hello()Hello World!> print(type(test))nilFunctions as Lua ValuesEach function in Lua is just a plain Lua value of the type function. Thesevalues can be compared (using == and ~=), bound to variable names, passedto functions, returned from functions, andusedaskeysintables(tablesareexplored in Chapter 4). A Lua value that is treated this way is called a first-classobject, and a language that supports functions in this way is said to havefirst-class functions.Run the following in your interpreter:> hello = function() print(“Hello World!“) endThis creates a new function called hello. This value can now be comparedin the same way you’d compare any other Lua value.> print(hello == hello)true> hello2 = hello> print(hello2 == hello)
Chapter 3 ■ Basic Functions and Control Structures 43true> hello2()Hello World!> hello2 = function() print(“Hello World!“) end> print(hello2 == hello)falseIn the final lines of the preceding example, a new function is created andbound to hello2. Even though the new function has the exact same definitionand body as hello, it is actually a distinct function.Making Decisions with the if StatementThe if statement is the basis for decision making in Lua, and it supportssimple conditionals as well as more complex statements. The syntax of themost basic if statement looks like this:if then-- do somethingendSimple ConditionalsAn if statement can be used to execute a block of code conditionally whenthe Boolean expression evaluates to true. To better see this, type the followinginto your interpreter:function conditional_test(num)print(“You input: “ .. num)if (num == 7) thenprint(“You found the magic number!“)endendThis example function prints whatever number it gets passed, but if thenumber 7 is passed, it will print an additional special message. Input thisfunction into your interpreter, and then test it with the following:> conditional_test(3)You input: 3> conditional_test(7)You input: 7You found the magic number!> conditional_test(13)You input: 13
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A Guide and Reference for Creating
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World of Warcraft® Programming: A
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CreditsAcquisitions EditorScott Mey
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xAcknowledgmentsI’d first like to
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xiiContents at a GlanceChapter 13 R
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xivContentsUsing History to Make Ch
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xviContentsExtending Tables with Me
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xviiiContents## Title: 127## Notes:
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xxContentsInvestigating UIPanelTemp
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xxiiContentsAdding an OnEvent Handl
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xxivContentsPreparing for the Token
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xxviContentsWriting an OnUpdate Fun
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xxviii ContentsSummary 496The Code
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xxxContentsChapter 28 API Categorie
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Page 39 and 40: IntroductionSince World of Warcraft
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Page 47 and 48: Chapter 1 ■ Programming for World
Page 55 and 56: CHAPTER2Exploring Lua BasicsLua is
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Chapter 6 ■ Lua Standard Librarie
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CHAPTER7Learning XMLAs mentioned in
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Chapter 7 ■ Learning XML 113XML T
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Chapter 7 ■ Learning XML 115docum
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Chapter 7 ■ Learning XML 117Figur
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Chapter 7 ■ Learning XML 119When
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Chapter 7 ■ Learning XML 121Summa
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CHAPTER8Anatomy of an AddonAs discu
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Chapter 8 ■ Anatomy of an Addon 1
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CHAPTER9Working with Frames, Widget
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CHAPTER12Interacting with WidgetsYo
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Chapter 12 ■ Interacting with Wid
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CHAPTER14Tracking Damage withCombat
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Chapter 14 ■ Tracking Damage with
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CHAPTER15Taking Action with SecureT
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Chapter 15 ■ Taking Action with S
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CHAPTER16Binding Keys and Clicksto
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Chapter 16 ■ Binding Keys and Cli
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338 Part III ■ Advanced Addon Tec
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CHAPTER18Responding to Graphic Upda
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Chapter 18 ■ Responding to Graphi
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CHAPTER21Responding to the Combat L
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CHAPTER22Creating Scroll FramesWhen
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Chapter 22 ■ Creating Scroll Fram
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self:SetValueStep(1.0)self:SetValue
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CHAPTER24Scanning and ConstructingT
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Chapter 24 ■ Scanning and Constru
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CHAPTER25Taking Protected Actionin
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Chapter 25 ■ Taking Protected Act
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PartIVReferenceIn This PartChapter
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540 Part IV ■ ReferenceThis notat
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542 Part IV ■ ReferenceAPI Meta-T
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544 Part IV ■ ReferenceRAID—Spe
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546 Part IV ■ Referencezero inten
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548 Part IV ■ ReferenceDigits 7-1
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550 Part IV ■ ReferenceRepresents
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552 Part IV ■ Referenceitemdata
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554 Part IV ■ Reference5. Epic (p
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556 Part IV ■ Referencemouseover
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558 Part IV ■ ReferenceConfirmati
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560 Part IV ■ ReferenceThe Muted
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564 Part IV ■ ReferenceUsable fol
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566 Part IV ■ ReferenceAfter call
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568 Part IV ■ ReferenceCalendarCo
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570 Part IV ■ ReferenceReturns:mo
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572 Part IV ■ ReferenceCalendarCo
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574 Part IV ■ ReferenceCalendarDe
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576 Part IV ■ ReferenceinviteType
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578 Part IV ■ ReferenceCalendarEv
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584 Part IV ■ Referencetexture—
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586 Part IV ■ ReferencependingInv
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588 Part IV ■ Referenceday—Day
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590 Part IV ■ ReferenceReturns:..
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592 Part IV ■ ReferenceOnly appli
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594 Part IV ■ ReferenceCanComplai
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596 Part IV ■ ReferenceCanGuildDe
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598 Part IV ■ ReferenceReturns:ca
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600 Part IV ■ ReferenceReturns:en
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602 Part IV ■ ReferenceProtectedP
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604 Part IV ■ ReferenceArguments:
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608 Part IV ■ ReferenceBlizzard U
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610 Part IV ■ ReferenceClearLFGAu
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612 Part IV ■ ReferenceautoReturn
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614 Part IV ■ ReferenceCloseBattl
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616 Part IV ■ ReferenceFires the
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618 Part IV ■ ReferenceCombatLogC
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620 Part IV ■ ReferenceCOMBATLOG_
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622 Part IV ■ ReferenceUsable bet
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624 Part IV ■ ReferenceCreateMacr
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626 Part IV ■ ReferenceDeclineNam
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630 Part IV ■ ReferenceThe list o
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632 Part IV ■ ReferenceEnableSpel
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634 Part IV ■ ReferenceUsable fol
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640 Part IV ■ ReferenceGMSurveySu
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642 Part IV ■ Referencequantity
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644 Part IV ■ ReferenceThe toolti
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646 Part IV ■ Referencelocal acti
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652 Part IV ■ ReferenceGetArenaTe
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654 Part IV ■ ReferenceReturns:in
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656 Part IV ■ ReferencebuyoutPric
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664 Part IV ■ ReferenceExample:--
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666 Part IV ■ Referencebreakenden
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668 Part IV ■ ReferencevehicleY
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670 Part IV ■ ReferenceReturns:ac
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672 Part IV ■ ReferenceReturns:li
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674 Part IV ■ ReferenceGetCVarMin
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676 Part IV ■ ReferenceReturns:ch
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678 Part IV ■ ReferenceGetChatWin
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680 Part IV ■ ReferenceCR_CRIT_TA
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682 Part IV ■ Referenceenable—1
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684 Part IV ■ Reference-- oops, i
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688 Part IV ■ ReferenceReturns:ti
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690 Part IV ■ ReferenceGetCurrent
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692 Part IV ■ ReferencesubType—
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696 Part IV ■ ReferenceoffhandExp
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700 Part IV ■ ReferenceGetGlyphSo
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702 Part IV ■ ReferenceThis funct
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704 Part IV ■ ReferencenumWithdra
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706 Part IV ■ ReferenceGetGuildEv
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708 Part IV ■ ReferenceReturns:ye
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710 Part IV ■ Referencestationery
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712 Part IV ■ Referencetexture—
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714 Part IV ■ ReferenceReturns:di
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716 Part IV ■ ReferenceGetInvento
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718 Part IV ■ ReferenceGetInvento
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720 Part IV ■ ReferenceExample:_,
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724 Part IV ■ Referencefor stat,
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726 Part IV ■ ReferenceReturns:ma
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728 Part IV ■ ReferenceisLeader
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730 Part IV ■ ReferenceGetLatestC
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732 Part IV ■ ReferenceGetLootRol
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734 Part IV ■ ReferenceGetMacroIn
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736 Part IV ■ ReferenceGetMapInfo
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738 Part IV ■ ReferenceNot all pa
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740 Part IV ■ ReferenceitemCount
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742 Part IV ■ ReferenceBREATH—U
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744 Part IV ■ ReferenceChatFrame1
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746 Part IV ■ ReferenceIf the giv
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748 Part IV ■ ReferenceisFull—1
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750 Part IV ■ ReferenceGetNumComp
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752 Part IV ■ ReferenceGetNumFrie
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754 Part IV ■ Referenceindex—In
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756 Part IV ■ ReferenceOnly valid
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758 Part IV ■ ReferenceGetNumSave
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760 Part IV ■ Referenceinspect—
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762 Part IV ■ ReferenceOnly valid
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764 Part IV ■ ReferenceReturns:ch
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766 Part IV ■ ReferenceNote: GetP
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768 Part IV ■ ReferenceReturns:na
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770 Part IV ■ Referencecasting a
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772 Part IV ■ Referenceelseif ( l
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774 Part IV ■ ReferenceGetQuestLo
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782 Part IV ■ Reference“notread
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784 Part IV ■ ReferenceGetRestSta
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786 Part IV ■ ReferenceNote the p
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788 Part IV ■ Referencelocked—
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790 Part IV ■ ReferenceGetSelecte
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792 Part IV ■ ReferenceReturns th
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794 Part IV ■ ReferenceA Bind on
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796 Part IV ■ ReferenceGetSpellCo
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800 Part IV ■ Referencepet—The
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802 Part IV ■ ReferenceReturns:te
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806 Part IV ■ ReferenceExample:Ge
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808 Part IV ■ ReferenceTotem func
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810 Part IV ■ ReferenceGetTradeSk
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812 Part IV ■ ReferenceGetTradeSk
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814 Part IV ■ ReferenceplayerReag
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818 Part IV ■ ReferenceGetTrainer
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820 Part IV ■ ReferenceFor trade
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822 Part IV ■ ReferenceReturns:re
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824 Part IV ■ ReferencehasVertexS
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826 Part IV ■ ReferenceoffHandExp
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828 Part IV ■ ReferencedynamicToo
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832 Part IV ■ ReferenceGuildInfoR
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834 Part IV ■ ReferenceUsed by th
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836 Part IV ■ ReferenceNon-Blizza
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842 Part IV ■ ReferenceReturns:co
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844 Part IV ■ ReferenceIsDressabl
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846 Part IV ■ ReferenceIsFactionI
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848 Part IV ■ Referenceprint(name
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850 Part IV ■ ReferenceIsInventor
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852 Part IV ■ ReferenceReturns:mo
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854 Part IV ■ Reference‘‘outd
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856 Part IV ■ ReferenceReturns:in
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858 Part IV ■ ReferenceIsSelected
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860 Part IV ■ ReferenceReturns:is
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862 Part IV ■ Referenceunit—A u
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864 Part IV ■ ReferenceItemHasRan
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866 Part IV ■ ReferenceItemTextNe
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868 Part IV ■ ReferenceKBQuery_Be
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870 Part IV ■ ReferenceReturns:ca
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874 Part IV ■ ReferenceINSECURE
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876 Part IV ■ ReferenceLOOT_OPENE
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878 Part IV ■ ReferenceMac OS X o
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880 Part IV ■ ReferenceMac OS X o
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882 Part IV ■ ReferenceProtectedM
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886 Part IV ■ ReferencePetRenameR
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888 Part IV ■ ReferencePickupEqui
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890 Part IV ■ ReferencePickupPlay
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894 Part IV ■ ReferencePromoteToL
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898 Part IV ■ ReferenceRemoveChat
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900 Part IV ■ ReferenceRequestBat
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902 Part IV ■ ReferenceResetViewR
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906 Part IV ■ ReferenceOutput inc
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908 Part IV ■ ReferenceUsable aft
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912 Part IV ■ Referencez-“zone
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914 Part IV ■ ReferenceAdapts the
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916 Part IV ■ ReferenceSetCVarSet
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918 Part IV ■ ReferenceUsed by th
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990 Part IV ■ ReferenceUnlike sim
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998 Part IV ■ ReferenceVoiceGetCu
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1006 Part IV ■ ReferenceLua APIgs
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1010 Part IV ■ ReferenceLua APIRe
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1022 Part IV ■ ReferenceLua APIFo
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1024 Part IV ■ ReferenceLua APIRe
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1026 Part IV ■ ReferenceGetAchiev
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1028 Part IV ■ ReferenceIsUsableA
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1032 Part IV ■ ReferenceGetNumBan
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1036 Part IV ■ ReferenceGetCVarDe
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1038 Part IV ■ ReferenceCalendarE
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1042 Part IV ■ ReferenceChannelUn
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1044 Part IV ■ ReferenceDoEmote
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1046 Part IV ■ ReferenceQuit—At
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1048 Part IV ■ ReferenceGetContai
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1052 Part IV ■ ReferenceGetFuncti
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1054 Part IV ■ ReferenceGetSelect
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1056 Part IV ■ ReferenceGetGuildB
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1058 Part IV ■ ReferenceGetGuildT
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1060 Part IV ■ ReferenceGetSpellL
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1066 Part IV ■ ReferenceIsControl
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1074 Part IV ■ ReferenceSecureCmd
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1080 Part IV ■ ReferencePitchUpSt
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1082 Part IV ■ ReferenceParty Fun
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1084 Part IV ■ ReferenceGetPetFoo
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1086 Part IV ■ ReferenceConfirmBi
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1088 Part IV ■ ReferenceUnitChara
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1090 Part IV ■ ReferenceGetGossip
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1092 Part IV ■ ReferenceGetQuestL
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1094 Part IV ■ ReferenceRaid Func
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1096 Part IV ■ Referenceissecure
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1098 Part IV ■ ReferenceGetSocket
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1100 Part IV ■ ReferenceIsAttackS
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1102 Part IV ■ ReferenceGetManaRe
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1104 Part IV ■ ReferenceGetNumTal
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1106 Part IV ■ ReferenceTracking
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1112 Part IV ■ ReferenceUnitInBat
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1114 Part IV ■ ReferenceGetCurren
Page 1158 and 1159:
1116 Part IV ■ ReferenceVehicleAi
Page 1160 and 1161:
1118 Part IV ■ ReferenceDisplayCh
Page 1163 and 1164:
CHAPTER29Widget ReferenceTo respond
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Chapter 29 ■ Widget Reference 112
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1278 Part IV ■ ReferenceADDON_ACT
Page 1322 and 1323:
1280 Part IV ■ ReferenceCALENDAR_
Page 1324 and 1325:
1282 Part IV ■ ReferenceCHAT_MSG_
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1284 Part IV ■ ReferenceCORPSE_OU
Page 1328 and 1329:
1286 Part IV ■ ReferenceGUILDBANK
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1288 Part IV ■ ReferenceKNOWLEDGE
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1290 Part IV ■ ReferenceOPEN_TABA
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1292 Part IV ■ ReferencePLAYER_EN
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1294 Part IV ■ ReferenceQUEST_LOG
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1296 Part IV ■ ReferenceTRADE_POT
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1298 Part IV ■ ReferenceUNIT_PET_
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1300 Part IV ■ ReferenceUPDATE_MA
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PartVAppendixesIn This PartAppendix
Page 1348 and 1349:
1306 Part V ■ AppendixesUse Meani
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1308 Part V ■ Appendixeshard codi
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1310 Part V ■ AppendixesOrganizat
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1312 Part V ■ Appendixesespeciall
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1314 Part V ■ Appendixesitself to
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1316 Part V ■ AppendixesTAIL CALL
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1318 Part V ■ AppendixesEach time
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1320 Part V ■ AppendixesEven if y
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1322 Part V ■ AppendixesEach even
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1324 Part V ■ Appendixesthe basic
Page 1368 and 1369:
1326 Part V ■ AppendixesEntering
Page 1371 and 1372:
APPENDIXBUtilizing Addon LibrariesW
Page 1373 and 1374:
Appendix B ■ Utilizing Addon Libr
Page 1375 and 1376:
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Page 1379:
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1340 Part V ■ AppendixesOne major
Page 1384 and 1385:
1342 Part V ■ Appendixessvn updat
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1344 Part V ■ AppendixesGit and M
Page 1388 and 1389:
1346 Part V ■ AppendixesOnce that
Page 1390 and 1391:
1348 Part V ■ Appendixesremote: a
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1350 Part V ■ Appendixeshave alre
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1352 Part V ■ Appendixesthe other
Page 1396 and 1397:
1354 Part V ■ Appendixesand open
Page 1399 and 1400:
IndexAAbandonQuest, 556AbandonSkill
Page 1401 and 1402:
Index ■ A-B 1359hyperlink, 549-55
Page 1403 and 1404:
Index ■ B-C 1361BuyPetition, 564B
Page 1405 and 1406:
Index ■ C-C 1363Lua library funct
Page 1407 and 1408:
Index ■ C-C 1365storing damage an
Page 1409 and 1410:
Index ■ D-E 1367dropdown frames,
Page 1411 and 1412:
Index ■ F-F 1369TabButtonTemplate
Page 1413 and 1414:
Index ■ G-G 1371GetAchievementNum
Page 1415 and 1416:
Index ■ G-G 1373GetGameTime, 699G
Page 1417 and 1418:
Index ■ G-G 1375GetNumLetters(),
Page 1419 and 1420:
Index ■ G-G 1377GetStatusBarColor
Page 1421 and 1422:
Index ■ G-I 1379GuildInvite, 832G
Page 1423 and 1424:
Index ■ I-K 1381IsPlaying(), Anim
Page 1425 and 1426:
Index ■ L-M 1383Lua interpreterdo
Page 1427 and 1428:
Index ■ O-O 1385OnClick widget sc
Page 1429 and 1430:
Index ■ P-R 1387PlaySoundFile, 89
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Index ■ S-S 1389how addon code ca
Page 1433 and 1434:
Index ■ S-S 1391SetInventoryItem(
Page 1435 and 1436:
Index ■ S-S 1393overview of, 337S
Page 1437 and 1438:
Index ■ T-T 1395table.insert, 58-
Page 1439 and 1440:
Index ■ U-U 1397UnitArmor, 962Uni
Page 1441 and 1442:
Index ■ W-W 1399WWebLua, 15well-f
Page 1443:
Your secret weapon againstthe Lich
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