angelfor3v3r / ue4genny

An Unreal Engine 4 SDK generator using SdkGenny

UE4Genny

UE4Genny is an SDK generator for Unreal Engine 4 games. It aims to provide a functional SDK that requires little to no editing after generation to use. Actual SDK generation is done via the sister project SdkGenny.

UE4Genny is intended for MODDING games not CHEATING!

Usage

UE4Genny requires some assembly (work on your part). It does not function out of the box. It contains NO code from Unreal Engine 4, you must provide that yourself. Here are the general steps to get UE4Genny working:

1. Clone this repository.
2. Download the source code for the correct version of UE4 that the game you are targeting uses.
   • You should also try using the same compiler the game uses to compile UE4Genny.
3. Copy the Engine/Source/ directory from UE4 to your UE4Genny directory (<UE4Genny directory>/Source/). UE4Genny will use this copy of UE4's source code.
   • If you already have a copy of UE4 somewhere else and you would prefer to use that, you can set the CMake variable UE4_SOURCE_DIR to the directory you want to use.
4. Compilation will likely fail at this point because some edits to the UE4 source is required. Namely:
   • <UE4 Source>/Runtime/CoreUObject/Public/UObject/Class.h: Make UEnum::Names, UStruct::SuperStruct public.
   • <UE4 Source>/Runtime/CoreUObject/Public/UObject/UnrealType.h: Make FBoolProperty::FieldSize, FBoolProperty::ByteMask and FBoolProperty::FieldMask public.
   • <UE4 Source>/Runtime/CoreUObject/Public/UObject/UObjectBase.h: Make UObjectBase::ClassPrivate public.
5. UE4Genny should now compile.
6. Make a new config header file for the game you are targeting (an example is provided in src/DRGConfig.hpp which works for the current Xbox Game Pass version of Deep Rock Galactic).
7. Set the CMake variable CONFIG_HPP to the newly created config header file.
8. Define the following constants in your newly created config header file (you need to find the values for these constants yourself):

// A memory pattern string that can be used to find the games GUObjectArray global variable.
constexpr char* GUOBJECTARRAY_PAT = "...";

// A memory pattern string that can be used to find the games FName::ToString() method.
constexpr char* FNAME_TOSTRING_PAT = "...";

// The VTable index of the games UObject::ProcessEvent virtual method.
constexpr int UOBJECT_PROCESSEVENT_INDEX = ...;

At this point you should be able to compile a game specific version of UE4Genny that will work with your target game. If it still does not work, attach a debugger and see what the problem is. Occasionally you will need to modify certain base structures so that they match what the game has (usually not required if you're using the correct version of UE4's source for a given game). You may also need to edit or add UE4 specific compiler definitions in the CMakeLists.txt. If it isn't working now it's up to you to fiddle around and figure out what changes you need to make to get everything that UE4Genny uses to match up with what your target game is using.

At the end of this process, simply inject UE4Genny.dll into the target game and wait for an sdk/ folder to appear.

Note about compatibility

UE4Genny is only tested with fairly recent versions of UE4. Older versions of UE4's reflection system was fairly different so UE4Genny won't work with those older versions. At least not by following the steps outlined above. For older versions you will likely need to make some minor changes to UE4Genny (basically FProperty was previously UProperty and so on for the various property types).