Megabonk Logger UI (IL2CPP)

A tiny in-game logger/patcher for IL2CPP Unity games. Pick a Type, Method, and optional parameter signature at runtime and Harmony-patch it to log calls — no rebuilds required.

This was made primarily because apparently the newest version of BepInEx bleeding edge and unity explorer are legitimately harder for me to get working than just creating a tool to do basically the same thing with extra steps

Note: This release ships only the plugin DLL. It assumes you already have BepInEx 6 (IL2CPP/CoreCLR) installed for the game.

Features

• In-game UI to select target Type / Method
• Works with global-namespace classes and nested types (Outer+Inner)
• Patch by explicit signature or by overload index (#0, #1, …)
• Logs prefix/postfix to BepInEx/LogOutput.log
• Configurable hotkey + Ctrl/Alt/Shift modifiers
• No dependency packaging required (Unity & Harmony come from your install)

Basic Modding tutorial with this tool

• First, have a good understanding of c# and Cpp2IL which can be found here
• You must run the following:
  • Example: dump dummy DLLs for a Unity game folder Cpp2IL.exe --game-path "C:\Path\To\Your\Game" --output-root "C:\Cpp2IL-Out" --run-analysis --skip-method-dumps
• Using this tool will generate a dump of all of the dlls a unity game uses, which you can then use a tool like ILSpy to figure out what methods might contain the fields you want to patch

This is not a full modding tutorial, do the research on using ILSpy

• From here, you have to use microsoft SDK and .NET to generate dlls from c# code, using BepInEx libraries and such.
• You're on your own from here to create whatever mod you would like to use or see

Requirements (not bundled)

• BepInEx 6 bleeding-edge (IL2CPP/CoreCLR build)
• The game’s UnityEngine assemblies (already in the game)
• HarmonyX (included with BepInEx)

Installation

1. Copy the DLL to your plugins folder:

   <GameFolder>\BepInEx\plugins\Megabonk.LoggerUI.dll
   

2. Launch the game. In BepInEx\LogOutput.log you should see:

   [Info   :MB-LoggerUI] Logger UI loaded. Toggle: F8
   

Usage

1. Press F8 (default) to open/close the UI.
2. Fill the fields:
   • Type
     • Global namespace: ChestOpening
     • Nested class: Outer+Inner
     • Full name also works: Assets.Scripts.Actors.Player.MyPlayer
   • Method
     • Example: OpenChest, Update
   • Param Types CSV (optional)
     • Leave empty for parameterless or unique methods
     • Use full names, e.g.:

       System.Int32, Assets.Scripts._Data.ItemData
       

     • Or click List Overloads and enter #<index> (e.g., #0)
3. Click Patch. Then perform the action in game.
4. Watch BepInEx\LogOutput.log for entries like:

   [Prefix] ChestOpening args: ...
   [Postfix] ChestOpening -> (done)
   

Helper Buttons

• Find Type – searches loaded assemblies and logs matching types.
• List Overloads – logs all overloads for the specified method on the resolved type.

Configuration

A config file is created on first run:

BepInEx\config\com.yourname.megabonk.loggerui.cfg

[UI]
ToggleKey = F8
RequireCtrl = false
RequireAlt = false
RequireShift = false

Examples

• F8 only → leave all modifiers false
• Ctrl+Shift+F8 → ToggleKey=F8, RequireCtrl=true, RequireShift=true

Tips

• If ILSpy shows the class under {} (global namespace), use just the class name in Type.
• For nested types, use a plus: Parent+Child.
• If signature resolution is tricky, use List Overloads then select with #index.
• Some auto-generated accessors (e.g., property getters/setters) may not be patchable.

Troubleshooting

• UI doesn’t open
  Check the config file above and ensure your hotkey + modifiers are correct. Verify BepInEx is loading the plugin in LogOutput.log.

• “Method not found” when patching
  Use Find Type to confirm the full name, then List Overloads and pick with #index.