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How to use external libraries within Cheat Engine

 
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mikey1993
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PostPosted: Tue May 02, 2023 9:12 pm    Post subject: How to use external libraries within Cheat Engine Reply with quote

Hi guys. I was hoping for some guidance on how to incorporate external libraries within CEs Lua such as LuaSQL or LuaFileSystem.

In this case I wanted to use wxLua for GUI purposes like creating an overlay over the game and feed it data to display on the screen.

Any information or links to a guide would be appreciated. Thank you!
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Dark Byte
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PostPosted: Wed May 03, 2023 12:12 am    Post subject: Reply with quote

Depends on where it has to run (game or ce)

and how to use it.

normally you'd have to compile those libraries to the same version as ce's lua with the .lib files

But for you usage you want it to run inside the game. So you'll have to load lua itself into the target process and then use that to load the wxGui library and given it commands to generate a gui

But before you spend time on this, wxGui won't work as overlay for 3D games. If it's 3D then better look into a 3d overlay like ce's d3d hook. And then create sprites with the gui you prefer

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mikey1993
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PostPosted: Wed May 03, 2023 1:44 am    Post subject: Reply with quote

Thank you DB, I'll look into that. I tried following these instructions I found but I'm not sure how accurate they are. I get a nil return for "current_dir" variable. Could it be because I'm using a dll (lfs.dll) for Lua 5.3 ?


To use LuaFileSystem with Cheat Engine, you will need to follow these steps:

1. Download the latest version of LuaFileSystem

2. Copy the lfs.dll file from the luafilesystem-1.8.0\src directory to your Cheat Engine autorun directory. This directory is usually located in your Cheat Engine installation folder (e.g., C:\Program Files\Cheat Engine 7.3\autorun).

3. In your Lua script, add the following code to load the lfs library:

Code:
local lfs = package.loadlib("lfs.dll", "luaopen_lfs")()


This will load the lfs.dll file and make the lfs module available for use in your script.

1. You can now use the lfs module functions in your script. For example, to get the current working directory, you can use the following code:

Code:
local current_dir = lfs.currentdir()
print(current_dir)


Note: If you encounter any issues with loading the lfs module, make sure that you have the correct version of lfs.dll for your version of Lua and that it is located in the correct directory. You may also need to add the directory containing lfs.dll to your system's PATH environment variable.
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Dark Byte
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PostPosted: Wed May 03, 2023 2:32 am    Post subject: Reply with quote

first of, LFS is already part of CE's installation so you can just do lfs.currentdir()

(the lfs dll is in <cheatenginedir>\clib*\lfs.dll)

as for why the lfs.dll from the package doesn't work is because it's not compiled for ce's lua implementation. It expects to find a lua53.dll, which isn't there. There's only lua53-32.dll and lua53-64.dll

you need to compile lfs yourself and make it link against these dll's

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AylinCE
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PostPosted: Wed May 03, 2023 2:36 am    Post subject: Reply with quote

It looks like "lfs" is already defined in CE.

Code:
function lfsAttr(aa)
attr=lfs.attributes(aa)
if attr then
  --file/folder exists
  if attr.mode=='directory' then
    print("folder exists")
  else
    print("It exists, but is no folder")
  end
else
  --file/folder does not exist
  print("Does not exist")
end
end

scriptFile = getCheatEngineDir() --..'autorun'

local a1=(scriptFile..'myFolder')
local a2=(scriptFile..'languages')

print("********* a1 **********")
lfsAttr(a1)
print("********* a2 **********")
lfsAttr(a2)

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