![]() How do I return a value from a void or prefix? Can you subclass? Can you use a ThingComp? A MapComponent? There may be viable alternatives without the added dependency. Before you do that, consider the alternatives. Harmony is a fantastic tool, that you'll soon want to use for everything. If the original method has a return type, you can alter its _result by passing it by ref. If you must use a transpiler, you might find useful notes here. Transpilers are difficult to debug and therefor hard to create/maintain/update. Refer to MSDN and Harmony documentation for more info. They use low-level IL-code, from System.Reflection and. These alter the inner working of the method. Use these for greatest compatibility.Ī transpiler is a set of CodeInstructions. ![]() This type of prefix may also prevent other prefixes from running.Ī postfix is a method that runs after the original method. This will cause compatibility issues if you're not very careful. If a bool returns false, the original method is skipped. It can have a return type of void or bool. It offers three ways of doing this: prefixes, postfixes, and transpilers.Ī prefix is a method that runs before the original method. Harmony can alter the workings of any method. You don't need to know the inner workings of JIT-compilation, reflection and inlining, but a basic understanding of C# and/or programming in general is assumed in this article.You need to be able to write a Hello World program.If you still haven't set up a solution, you're not ready for Harmony.4.3 How do I return a value from a void or prefix?.This article is mostly a "this is what you can do" summary in 5 minutes. Refer to the original documentation ( here). The snippets on this page are not meant as an exhaustive document on all things Harmony. Because this does not change existing functionality of RimWorld, it MOST LIKELY does not impact other mods and runs in parallel with other Harmony patches. Usually this is all you need for your Mod. Harmony is great for running code patches before (Prefix) or after (Postfix) an existing method. Please only use HugsLib when you want to utilize some of its features! This is a bad practice, especially for beginners new to RimWorld Modding. Simply add Harmony as a dependency on Steam instead.Īdditionally, please DO NOT use HugsLib for an "easy" Harmony implementation due to the fact that HugsLib becomes an unnecessary and unutilized dependency for mods and beginners grow accustomed to using HugsLib in all their mods even if they never touch HugsLib's API in their code. Please do not include the dll (0Harmony.dll) in your mod's assemblies folder! Outdated versions of Harmony can cause issues. To integrate Harmony into your mod for use, download the latest stable release and add it as a reference to your C# project. Harmony is the current best practice for changing the runtime execution of code in RimWorld. Here is a very short example on how to patch the method WindowStack.Harmony - A library for patching, replacing and decorating. Harmony works with any kind of application and code. Alternatively, let your IDE copy the dll to your assembly folder and make sure it is loaded early (for that, the dll is already conveniently named 0Harmony.dll). Stay tuned!Īdd the Harmony dll to your project and merge it into your final dll with a tool like ILMerge. NET Core in all its versions is upcoming and currently being tested. Net 3.5 or Mono 2.x and include the Harmony dll. For a typical Unity target, simply set your project to. Harmony was tested on PC, Mac and Linux and support 32- and 64-bit. It has no other dependencies and will most likely work in other environments too. NET 2.0 and is compatible with Mono which makes it a great way to develop extensions for Unity games. Harmony is designed to work with a minimum requirement of. Multiple Harmony patches co-exist and don't conflict with each other.Modify the original with IL code processors.Execute your code before and/or after the original method.A way to keep the original method intact.Where other patch libraries simply allow you to replace the original method, Harmony goes one step further and gives you: If you develop in C# and your code is loaded as a module/plugin into a host application, you can use Harmony to alter the functionality of all the available assemblies of that application. Harmony 2 has its own documentation site. ![]() □ Note: This Wiki is only for Harmony v1.2.0.1 A library for patching, replacing and decorating. ![]()
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