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⭐ Jar2DLL

Easy to use Jar to DLL converter (not a direct Java to C++ translator)

Features

• Auto compilation
• Fast
• Supports all Java versions
• Resource support
• GUI

Requirements

You need to have few pre-installed things to use Jar2DLL:

• CMake
• Visual Studio >2019 (Thanks for microshit, we can't simply install MSVC compiler without VS)

How to use

You can convert your JAR into DLL by 1 step:

java -jar Jar2DLL.jar (Will open GUI)

or

java -jar Jar2DLL.jar --input input.jar --output output.dll (Will start process)

There also few parameters:

• --cmake - Accepts full CMake path (C:/Program Files/CMake)
• --entryPoint - Accepts name of main class with main method (Yes, your DLL will start from main(String[]) method)
• --saveSource - Jar2DLL will save auto-generated C++ code

Explanation

Well, Jar2DLL is NOT Java to C++ translator. It works more easily. It allocates all your Java classes to arrays in a C++ source file, then does magic with JNI and defines your classes. If you were wondering how this works at a low level, you can check out how Jar2DLL generates a C++ source file.

Example of working

To show how Jar2DLL works, i made a little Minecraft hack that uses Reflection

(In video im running Vanilla 1.12.2 Minecraft, not Forge)

Class<?> minecraftClass = Class.forName("bhz"); // Searching for net/minecraft/client/Minecraft class

Field theMinecraft = minecraftClass.getDeclaredField("R"); // theMinecraft field
theMinecraft.setAccessible(true);

Object mcInstance = theMinecraft.get(null);
Field thePlayer = minecraftClass.getDeclaredField("h");
thePlayer.setAccessible(true);
Object player = thePlayer.get(mcInstance); // thePlayer instance
if(player != null){
  if(!isMessageSent){
    Method method = player.getClass().getDeclaredMethod("g", String.class);
    method.invoke(player, "Hello from Jar2DLL");
    isMessageSent = true;
  }
  Field onGround = player.getClass().getField("z"); // onGround field
  onGround.set(player, true);
}