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

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188 Part II ■ Programming in World of Warcraftfunctions, which can only be used by Blizzard code because of security andautomation concerns.The functions cover quite a wide range of topics from changing gamesettings to posting auctions. Some operate like Lua library functions; othersprovide a specific interface to some aspect of gameplay.As you progress through this chapter, you may want to flip to Chapter 27,‘‘API Reference,’’ to see the details of the various APIs presented. It will bothhelp you to understand the content of this chapter and give you a glimpse intothe kinds of functions available to you.Normal APIsMost of the built-in functions you’ll use on a regular basis are defined inC, rather than in Lua. They interact with the various subsystems of theWoW client to gather information about the state of the game and to takeaction in several ways. One example is UnitHealth, which returns the healthof a specified unit (a creature or player referenced by a unit ID). Run thefollowing statement in-game, and it displays your current number of hitpoints:/run print(UnitHealth(“player“))The unit ID in this case is “player“, which always refers to you, the player.Use “target“ instead, and it prints the health of your target, or nil if you haveno target.This introduces a recurring theme in the WoW API. Many groups of functionsoperate on a certain type of data. In the preceding example, the datatype is unit ID. Some of the many functions that use unit IDs are UnitMana,UnitExists,andUnitLevel.Library-like APIsThe Lua standard libraries provide a wide range of functions for stringmanipulation, mathematic operations, and so on. However, not all functionsthat are exposed in a standard Lua installation are appropriate for inclusionin WoW. Because addons are not allowed to access any files directly, theio library obviously isn’t included. The debug and os libraries also containsome more potentially hazardous functions, so they aren’t included. However,some of the functions provided by these libraries are benign enough that theirfunctionality has been exposed through new functions. Table 11-1 shows someof these library-API relationships.NOTE Some of the parameters and returns may vary between the standardversions and those included in the WoW client. See Chapter 27, ‘‘API Reference,’’for documentation of each function.
Chapter 11 ■ Exploring the World of Warcraft API 189Table 11-1: Library Functions and Their API EquivalentsSTANDARD LIBRARYEQUIVALENT WOW APIos.datedateos.timeos.difftimedebug.tracebacktimedifftimedebugstackIn addition to direct library translations, several functions specific to WoWplay a support role in addon development but do not directly relate to anythingin-game. These have semantics similar to library functions but are technicallypart of the WoW API. They are easily identifiable because their names areentirely lowercase—debugprofilestart and hooksecurefunc, forinstance.Some of these functions are defined by the game client, but others are definedinthegame’sFrameXMLcode.FrameXML FunctionsThe code for the default user interface includes definitions for a number ofutility functions. Although they may not be considered APIs in the strictestsense, their usage is consistent enough with true API functions that theydeserve documentation here. For example, consider the definition of theTakeScreenshot function:function TakeScreenshot()if ( ActionStatus:IsShown() ) thenActionStatus:Hide();endScreenshot();endThis function is designed to make it easier to take screenshots programmatically.Normally after you take a screenshot the ‘‘Screen Captured’’ message isdisplayed. This function hides that text so you can take multiple screenshotsin quick succession.The most unique characteristic of FrameXML-defined functions is that youcan examine their inner workings. All of the APIs mentioned so far are hiddenbehind the Lua-C interface. You can call the functions from Lua and use thevalues they return, but in general there is no way to know exactly how theyoperate.Protected FunctionsEarly in WoW’s life, addons had free reign over all functions available in theAPI. Some of these functions included movement control, combat activities,
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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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xxxii ContentsTrade Skill Functions
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xxxiv ContentsRequesting Data Befor
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IntroductionSince World of Warcraft
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Introduction xxxixPart II discusses
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CHAPTER1Programming for Worldof War
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Chapter 1 ■ Programming for World
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CHAPTER2Exploring Lua BasicsLua is
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CHAPTER8Anatomy of an AddonAs discu
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CHAPTER16Binding Keys and Clicksto
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338 Part III ■ Advanced Addon Tec
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CHAPTER18Responding to Graphic Upda
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CHAPTER22Creating Scroll FramesWhen
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PartIVReferenceIn This PartChapter
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624 Part IV ■ ReferenceCreateMacr
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678 Part IV ■ ReferenceGetChatWin
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682 Part IV ■ Referenceenable—1
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736 Part IV ■ ReferenceGetMapInfo
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756 Part IV ■ ReferenceOnly valid
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758 Part IV ■ ReferenceGetNumSave
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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
Page 1138 and 1139:
1096 Part IV ■ Referenceissecure
Page 1140 and 1141:
1098 Part IV ■ ReferenceGetSocket
Page 1142 and 1143:
1100 Part IV ■ ReferenceIsAttackS
Page 1144 and 1145:
1102 Part IV ■ ReferenceGetManaRe
Page 1146 and 1147:
1104 Part IV ■ ReferenceGetNumTal
Page 1148 and 1149:
1106 Part IV ■ ReferenceTracking
Page 1150 and 1151:
1108 Part IV ■ ReferenceGetTradeS
Page 1152 and 1153:
1110 Part IV ■ ReferenceIsTrainer
Page 1154 and 1155:
1112 Part IV ■ ReferenceUnitInBat
Page 1156 and 1157:
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
Page 1165 and 1166:
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_
Page 1326 and 1327:
1284 Part IV ■ ReferenceCORPSE_OU
Page 1328 and 1329:
1286 Part IV ■ ReferenceGUILDBANK
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1288 Part IV ■ ReferenceKNOWLEDGE
Page 1332 and 1333:
1290 Part IV ■ ReferenceOPEN_TABA
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1292 Part IV ■ ReferencePLAYER_EN
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1294 Part IV ■ ReferenceQUEST_LOG
Page 1338 and 1339:
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
Page 1350 and 1351:
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
Page 1366 and 1367:
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:
Page 1382 and 1383:
1340 Part V ■ AppendixesOne major
Page 1384 and 1385:
1342 Part V ■ Appendixessvn updat
Page 1386 and 1387:
1344 Part V ■ AppendixesGit and M
Page 1388 and 1389:
1346 Part V ■ AppendixesOnce that
Page 1390 and 1391:
1348 Part V ■ Appendixesremote: a
Page 1392 and 1393:
1350 Part V ■ Appendixeshave alre
Page 1394 and 1395:
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
Page 1431 and 1432:
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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