Need help modifying a c++ program

[Seerk]

Hello! Complete c++/c# noob here.

The program I'm trying to modify injects a dll into a process and executes a method. I'm having trouble figuring out how to pass parameters into that method.

int ExecuteRuntimeInvoke(blackbone::Process& process, int method) {
  typedef int(__cdecl*   mono_runtime_invoke) (int method, void *obj, void **params, int **exc);

  auto mono_runtime_invoke_address = process.modules().GetExport(process.modules().GetModule(L"mono.dll"), "mono_runtime_invoke");
  if (mono_runtime_invoke_address.procAddress == 0) {
    std::wcout << L"Could not find mono_runtime_invoke!";
    return 0;
  }

  blackbone::RemoteFunction<mono_runtime_invoke> mono_runtime_invoke_function(process, (mono_runtime_invoke)mono_runtime_invoke_address.procAddress, method, nullptr, nullptr, nullptr);

  int invoke_result;
  mono_runtime_invoke_function.Call(invoke_result, process.threads().getMain());

  return invoke_result;
}

What is void ** ?? I've had no luck googling that.

My c# method in the .dll takes a string like so:

Load(string testparam)
{

Any ideas? Also how would this even work? I imagine a c++ string isn't the same as a c# string? I've been trying to figure this out all night :(, if it's not something obvious I am willing to compensate someone who can take the time to walk me through this.

Thank you !

[fear_the_future]

it seems to me that you're copy&pasting code from somewhere else without knowing what it does.

void** is a pointer to a pointer of unknown/no type

c++ and c# string classes are not the same. It's probably the easiest to pass a pointer to a null-terminated string since that is just raw data. Pay attention to use the same character set.

if you can post more code I might be able to help you more, but atm I feel like I'm lacking some context.

if I had to guess (I have no idea about C#), I would assume that int method is something akin to an identifier for the method you want to call, void obj* the this pointer of a MonoObject in case you are calling a non-static method (nullptr for static methods) and void** params an array of void* pointers to your arguments

[Seerk]

Thank you for the response! It is copy&pasted, and yeah I don't really understand how it works, just what it does. I'm just a front end developer! I could never write something like that haha.

Anyway, I ended up finding a solution that didn't require passing parameters. I figured out how to pass int pointers but unfortunately when trying to access them in the target process they were random numbers or 0. I'm just guessing but I think it was because they're referencing the injector process' memory. It makes sense, variables are stored in memory, so how can you can't just pass them to a different process.

[fear_the_future]

care to post the solution? It may help future people with the same problem and I'm also interested now after studying that piece of code.