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

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202 Part II ■ Programming in World of WarcraftExamining the FrameXML CodeA useful question whenever you are trying to accomplish something in acustom addon is to ask:‘‘Does the default user interface do this?’’Ifso,thensomewhereinthecodeforthedefaultUIisthetechniqueusedto accomplish the task; it’s just a matter of finding it. For example, you mightwant to display the player’s haste rating and percentage effect somewherein your addon. A quick look at the API categories doesn’t reveal anythingimmediately so you instead look at the default user interface.That information is displayed on the character panel in the stats sectionat the bottom. To find out where that panel is defined, you can do a bitof investigative work. Start by running the /framestack command that wasintroduced in Chapter 9. From the information you get there, it appears thatPaperDollFrame and CharacterFrame are both good candidates. Convenientlyenough, these frames are defined in files by the same name in the FrameXMLcode.Opening CharacterFrame.xml shows you the definition of the differenttabs, so it appears that that’s the outmost frame that contains the subframes.The CharacterAttributesFrame in PaperDollFrame.xml, however,looks like a good candidate. Now that you’ve found the frame, you can openPaperDollFrame.lua to look around.At the top of the file you see a number of global constants defined. Lookingfor one having to do with haste, you find the following constants:CR_HASTE_MELEE = 18;CR_HASTE_RANGED = 19;CR_HASTE_SPELL = 20;When haste was first introduced in the game, there were different versionsfor melee, ranged, and spell. In Wrath of the Lich King they were all combinedinto a single haste rating. Pick the melee version and search for that throughoutthe whole file.The only instance in the file is in the following line of code, in the aptlynamed PaperDollFrame_SetAttackSpeed() function:statFrame.tooltip2 = format(CR_HASTE_RATING_TOOLTIP, iGetCombatRating(CR_HASTE_MELEE), GetCombatRatingBonus(CR_HASTE_MELEE));Now you can test these two functions to see if they work for your needs.Run the following code in-game:/run print(GetCombatRating(CR_HASTE_MELEE))/run print(GetCombatRatingBonus(CT_HASTE_MELEE))You will find that although the returns from GetCombatRating() are thesame, you may have different results for the actual percent bonus. This bonus
Chapter 11 ■ Exploring the World of Warcraft API 203could depend on any number of factors, and you’ll want to take that intoconsideration when using it in your addon.Looking at Another AddonIf you can’t find a place in the default user interface that does what you want,but know that other addons somehow accomplish it, you can always look atthe other addon. When doing this, keepinmindthatthecodewewriteasauthors is not completely open for copying. When in doubt, you may find ituseful to contact the author to see how he’s done something and ask if you canuseasimilarmethodinyourownaddon.Of course, sometimes it’s just a simple as finding the right function, whichyou can then just use directly in your own addon.Asking for Help!Each situation will be slightly unique, so it’s always useful to ask for helpwhen working on your own addon. A number of websites, forums, and chatrooms support addon development for World of Warcraft (see Appendix Dfor more information). When asking for help, we suggest the following:When initially presenting your problem, try to explain what you aretrying to accomplish instead of how you are trying to accomplish it.This gives the people who are helping you a chance to understand theproblem without getting caught up in a specific way of doing it. This cansometimes reveal a much nicer solution to the problem.Provide as much code as possible and indicate the areas that are havingproblems. Posting 10 lines of code out of a 300-line function makes it verydifficult to see what is happening. You can post large bits of code on siteslike http://pastey.net and http://pastebin.com.If you are getting an error, give the specific error text, and post the codeinvolved in the error.Be patient! Not everyone is always waiting around to pounce on a newquestion. You should continue to explore in your own time, and hopefullysomeone will be able to help you.SummaryThis chapter introduced you to APIs in the general sense, and gave youa specific example of how to use the item and container API to accessinformation about the player’s containers and items. Understanding the waythese functions interact with the game is essential to creating effective addonsthat accomplish a variety of goals.
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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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CHAPTER9Working with Frames, Widget
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CHAPTER16Binding Keys and Clicksto
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CHAPTER22Creating Scroll FramesWhen
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1078 Part IV ■ ReferenceModified
Page 1122 and 1123:
1080 Part IV ■ ReferencePitchUpSt
Page 1124 and 1125:
1082 Part IV ■ ReferenceParty Fun
Page 1126 and 1127:
1084 Part IV ■ ReferenceGetPetFoo
Page 1128 and 1129:
1086 Part IV ■ ReferenceConfirmBi
Page 1130 and 1131:
1088 Part IV ■ ReferenceUnitChara
Page 1132 and 1133:
1090 Part IV ■ ReferenceGetGossip
Page 1134 and 1135:
1092 Part IV ■ ReferenceGetQuestL
Page 1136 and 1137:
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
Page 1167 and 1168:
Page 1169 and 1170:
Page 1171 and 1172:
Page 1173 and 1174:
Page 1175 and 1176:
Page 1177 and 1178:
Page 1179 and 1180:
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Page 1313 and 1314:
Page 1315 and 1316:
Page 1317:
Page 1320 and 1321:
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
Page 1330 and 1331:
1288 Part IV ■ ReferenceKNOWLEDGE
Page 1332 and 1333:
1290 Part IV ■ ReferenceOPEN_TABA
Page 1334 and 1335:
1292 Part IV ■ ReferencePLAYER_EN
Page 1336 and 1337:
1294 Part IV ■ ReferenceQUEST_LOG
Page 1338 and 1339:
1296 Part IV ■ ReferenceTRADE_POT
Page 1340 and 1341:
1298 Part IV ■ ReferenceUNIT_PET_
Page 1342 and 1343:
1300 Part IV ■ ReferenceUPDATE_MA
Page 1345:
PartVAppendixesIn This PartAppendix
Page 1348 and 1349:
1306 Part V ■ AppendixesUse Meani
Page 1350 and 1351:
1308 Part V ■ Appendixeshard codi
Page 1352 and 1353:
1310 Part V ■ AppendixesOrganizat
Page 1354 and 1355:
1312 Part V ■ Appendixesespeciall
Page 1356 and 1357:
1314 Part V ■ Appendixesitself to
Page 1358 and 1359:
1316 Part V ■ AppendixesTAIL CALL
Page 1360 and 1361:
1318 Part V ■ AppendixesEach time
Page 1362 and 1363:
1320 Part V ■ AppendixesEven if y
Page 1364 and 1365:
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:
Page 1377 and 1378:
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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