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I never experienced World of Warcraft. I played other Blizzard games, both before and after its release, including the original Warcraft series and Diablo. I skipped over WoW for reasons I can’t completely recall. During the hype around “classic” I tried “retail” for a moment and abruptly stopped due to a move to a new home. I was tempted to play again after learning about “vanilla” servers but had already mentally committed myself to wait for the official servers. Classic finally launched on August 26, 2019 and I joined in as to not miss out on the twice in a lifetime experience.

Minutes passed during my group’s first play of the game and the chatter started about all the addons they just had to install. Unlike me they had played on and off for the last fifteen years, both vanilla and retail. Not having a clue, I played for a few sittings before getting the itch. What addons were out there and what they could do for me? Everyone had so much experience I thought it was only fair that I bridge the gap. I installed quite a few addons while feeling like a kid in a candy store. With all my handicaps addressed I was firmly hooked.

Then, out of nowhere, my curiosity got the best of me. How do these things work?!

This article assumes you have at least some basic knowledge in software development and are at least interested in how the World of Warcraft addon system works. I’m a software engineer by trade but I’ve never written a game addon before, so it’s not a requirement that you have either. If you’ve used or written a macro in game you’re already ahead.

Setting up the Development Environment

We’re going to need an editor to develop this addon. Older tutorials will recommend you the most basic of text editors, which will work, but we can do better than that. If you don’t already have a preference I would recommend downloading Microsoft Visual Studio Code. That should be more than enough for this journey and enable future programming endeavors. I have crossed paths with vscode plugins touting both Lua and World of Warcraft support but the editor is sufficient out of the box for what is needed here. Do explore the available extensions and make your own decision on their usefulness.

Creating a Folder for the Addon

How you manage your project long term is up to you. I’d recommend using GitHub to manage your code and only update your local addon directory when you are ready to test a new version, possibly with a deployment script. For now, since we are just getting started, let’s just work out of the Addons directory.

Provided you haven’t changed the default install location the World of Warcraft directory will either be located in C:Program Files or C:Program Files (X86) on Windows or the /Applications/ on a Mac. Depending on what you have installed you will may see _classic_ and _retail_ and _ptr_ folders in that directory. Open _classic_/Interface/Addons and create a Sandbox folder. An addon is born!

Creating the Table of Contents

In the Sandbox folder create a new text file named Sandbox.toc. This file provides the information required about the addon to the WoW client. If you’ve ever looked at package.json in a JavaScript project for example, this serves a similar purpose.

Add the following to the file:

The correct value for Interface can be found in game by running the following command: /run print((select(4, GetBuildInfo()))); At the time of writing classic is currently 11302. If you intend on targeting retail or vanilla instead be sure to update that value.

Following that, I believe Title, Notes, Author and Version are self explanatory. There are quite a few other values that I’ve observed in toc files, I would recommend peeking into other addons to discover those.

The final line Sandbox.lua is a pointer to where the actual code will be stored. At least one file is required, but for larger plugins multiple files can be referenced here and all will be loaded at runtime.

Out of curiosity I played around with changing directory names, file names and removing more details from the toc file. There wasn’t much that really caused the addon to fail to function. It’s definitely going to be good practice to have a detailed table of contents file, so the above is what I’d recommend as the minimum.

Writing Some Code

World of Warcraft addons are written in Lua which touts itself as “a powerful, efficient, lightweight, embeddable scripting language.” Lua should not be much effort to pick up if you have at least one language under your belt. If not, it will still be an excellent first language to learn.

To begin coding in Lua, create a Sandbox.lua file in the Sandbox folder that we created earlier and add the following code:

Additionally select one of the following samples of code and add it to the very end of the file:

Option A:

Option B:

Trying It Out

Time to boot up the game… No playing! Focus! When you enter the game one of two things should happen. If you selected Option A you should see “Hello World!” displayed in a graphical window:

If you selected Option B the results are a bit more mysterious. Where have the gryphons gone?

Congratulations! Your first addon is complete!

Beyond the Basics

There’s a lot more general programming that can be done within a addon but I won’t be going deep into Lua here at all as there are plenty of books already available to reference for the subject. There are even books such as Beginning Lua with World of Warcraft Add-ons and World of Warcraft Programming: A Guide and Reference for Creating WoW Addons specifically for World of Warcraft.

Finding out how to create or modify different elements in the WoW client is challenging and requires knowledge of the available API. The best resources for the API I’ve found so far are Wowpedia and WoWWiki.

Additionally a great way to learn how to do things is to take a look at Lua files in existing addons either that you have installed or those available on the web. Do be advised, mileage will vary with what is supported in different World of Warcraft client versions.

Limitations & Workarounds

There were a couple of interesting limitations I found while writing this article. The first is to call out to a url to GET or POST data. If it did exist, could have some pretty serious malicious abuses, so I’m not surprised it’s not there. It would have definitely been useful for some slick addons.

Another limitation is the inability to save data to an external file or read from an external file. This isn’t too limiting to addon developers as you have access to saved variables and can load as many Lua files as you please. Some plugins like CensusClassicPlus are getting around this limitation by having users upload files from their SavedVariables folder after logging out of the game.

Despite not being able to communicate directly over the Internet, addons still appear to be able to communicate with each other with some tricks. For example RealMobHealth and ClassicThreatMeter are using in game chat to send data between users in the current group who also have the addon installed.

Finally, not so much a limitation but a consideration is the variances betwen capabilities in the API between game versions. Since now we have classic, vanilla (which is multiple versions in itself) and retail the API is not always the same. Plugins will need to be tested and coded to work on all platforms, or only on a specific platform as not all are created equal. One way to adapt would be to switch addon executation paths programatically based on the game version retrieved from GetBuildInfo().

Debugging

While you are developing it will be useful to stay logged into the game. This allows you to switch in and out to make some changes to the addon, run /reload to restart the UI and continue debugging. Majority of the time your changes will be reflected unless you are doing something with changing files names or the toc file. It will also be useful to execute /console scriptErrors 1 during your coding session so that when Lua errors occur they are displayed immediately. Just don’t forget to turn it off using /console scriptErrors 0 before you go back to normal gameplay. As always, print and message functions will be your friend! Finally, there are also some interesting looking addons that may be of additional assistance including BugSack and BugGrabber which “eases the process of viewing bugs”.

Testing

While your addon may not grow large enough to justify any robust testing patterns it is a good idea to consider at least some basic testing strategies before things turn into spaghetti. The structure that was snuck into the example addon it allows for manual testing of functions by running manual commands, for example:

A surprising option that is available is WowUnit which “allows you to easily write unit tests for your World of Warcraft addons and provides an interface to monitor them”. This is probably the best choice for the majority of addons that require testing.

Lastly, for addons with considerable internal logic, it is very possible Lua itself could be used to test the addon without requiring the WoW client to be running. This would require mocking out parts of the WoW API and using a Lua interpreter to run your tests. While the most advanced option it would also be the most extendable.

Publishing

I assumed addons would need to manually acquired and installed by hand. However the Twitch client can automatically install addons for you as well as keep them in sync across machines using their client. You don’t have to be a streamer to use it. It works in conjunction with Curseforge, a directory of addons for multiple games. With millions of downloads for the most popular addons I would definitely recommend publishing to get exposure. In addition I’d again recommend using GitHub to allow others to collaborate and help maintain your addon. If you end up being inspired to create an addon, here are the instructions for creating and submitting a project.

Final Thoughts

I started this article to learn more about how addons worked inside World of Warcraft. What I discovered was a robust framework with all the tools I would expect from a development environment available to me. I’ve found myself torn between playing the game and continuing to look under the hood. There are numerous addons already available for WoW but nothing I’ve come across has felt like the end all be all. Much more could be done and there is considerable room for improvement. If the feedback to this article is positive I would absolutely consider writing a series of articles on this topic.

World of Warcraft is an MMORPG that was developed by Blizzard in 2004. For more than 15 years, it has been one of the most popular games of all time. It has everything an MMORPG needs to have — immersive lore, two factions to duke it out, fantastic raids, achievements, and much more. Simply put, there’s a little bit of something for everyone out there.

Another thing that WoW has is its own economy. Whether you’re playing retail or Classic, there are numerous ways to farm gold. For example, you can run old raids on multiple alts for some extra cash or dungeons for the BoEs you can sell, farm materials and then sell your goodies to the raiders, sell boosts, you name it.

However, that’s all boring. Do you know what’s the easiest and the most exciting way to make gold? Gambling for it! There’s no better feeling than beating your friend and getting that sweet, sweet gold they worked so hard for. Here’s how to do it.

A Friendly Wager

Contrary to popular belief, Booty Bay doesn’t run the best gambling houses on Azeroth — players do. The basis for all gambling in World of Warcraft is the /roll command. By typing /roll into the chat and pressing Enter, the game will automatically roll a number between 1-100 for you. While the command is most often used to determine loot priority in raids, it’s an excellent way to relieve your friends of some extra gold.

If you’re in a party or raid with someone, they will see the number you’ve rolled, and you will be able to see their rolls in return. So all you have to do is type in /roll and see what number you and the person you are wagering against got. The person with the highest number wins the predetermined amount of gold. Quite simple, isn’t it? And in case both of you roll the same number, simply reroll.

The Deathroll

Instead of typing /roll, did you know that you can do /roll and add any number? For example, if you type in /roll 500, the game will roll a random number between 1 and 500 rather than 1 and 100. So how does it work?

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Before you start, set the amount you wish to wager. Then, set the death-roll number and decide who goes first. Around 5,000 will be enough, but you can even go higher if you want to have some more fun. Keep in mind that the death-roll number has nothing to do with the amount of gold you’re wagering, and here’s why.

To start, the player who goes first will have to roll the death-roll number that is 5,000 in our example. Therefore, type in /roll 5000. The game will get you a random number. Let’s say that you got 3138. The other player then has to roll using that number. In our case, they would type /roll 3138. The game will then roll the number between 1 and 3138 and give, let’s say, 447, at which point you will have to type /roll 447.

The procedure repeats until someone rolls a 1 and the first person to do so loses and has to pay up. That’s an endless source of fun right there!

Raid-Wide Fun

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Last but not least, there’s raid-wide gambling, and anyone who’s in your raid can partake. While it can be done manually, having an add-on like CrossGambling makes the whole process a lot easier.

As is the case with every other method, decide on the amount you wish to gamble. Then, simply have everyone who wishes to partake roll that amount. After everyone has finished rolling, if you have the add-on, it will automatically calculate who has to pay how much and to whom. The winner is the player who rolled the highest, and the player who rolled the lowest number has to pay the difference to the player who rolled the highest.

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Final Thoughts

There’s no denying that gambling is exciting. After all, risking gold for a much greater profit has always attracted adrenaline seekers. If you ever decided to take your gold-making skills outside of Azeroth and to Las Vegas, you can visit this site to find the best casinos Las Vegas has to offer.