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

308 Part III ■ Advanced Addon Techniquesexactly frequent. One piece of misplaced taint may not cause any problemsuntil you join a raid group or travel to another continent, for example.These situations are where the taint logs can really shine. When you receivean ‘‘action blocked’’ message during development, simply turn on taint loggingand you can track down the problems. Level 2 is especially helpful in a case likethis because it allows you to see exactly when each variable becomes tainted.SummaryThis chapter covered a lot of ground. By now, you should be acquainted with:The basic intent of the secure code system, which is to protect the gamefrom automation while still enabling customization.The concept of protected frames and which of their characteristics arerestricted from changes during combat.How frame attributes allow secure code to receive control messages safelyfrom addon code.How taint can propagate from addon code to Blizzard code and cause theUI to fail, and how to identify and prevent this.The secure template system uses a wide assortment of specific features—taint, protected functions and frames, attributes, and so on—to achieve a muchlarger goal. It needs to protect the game against too much automation and, atthe same time, allow addons to alter the way you interact in combat. There isstill a lot to cover, but once you understand the basics laid out here, the restwill flow much more freely.