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UODEMODLL project - introduction | JoinUO Forums

UODEMODLL project - introduction

The UO "Demo" is a slightly modified OSI UO Server and Client which was bundled on the Ultima Online Second Age retail CD. This forum seeks to reveal it's mysteries.

Site Admin
Posts: 372
Joined: Wed Apr 08, 2009 6:35 am
PostPosted: Wed Sep 15, 2010 8:13 pm
This post acts as an introduction to the UODEMODLL subproject and its API.

In UoDemo+ Publish 15 I introduced the option to attach a DLL to the demo. Between then and now I've been working on a set of batch files and techniques to interact with the demo internals. The project is far from finished, and if it will evet get finished will depend on time and interest (from myself and feedback from others as yourself).

You will need:
- Borland C++ 5.5 (Free Compiler)
- Turbo Assember 5.X

Both of them are good old command-line tools, so don't expect something fancy :mrgreen: .

The idea of the uodemo.dll is:
- You set the environment variable UODEMODLL to a DLL made using this API
- You start uodemo+.exe (Publish 15 or later)
- uodemo+.exe will load your DLL
- uodemo.dll is now in the same address space as the EXE
- uodemo.dll makes patches inside uodemo+.exe in order to redirect (intercept) calls out of the EXE into the DLL
- Because we own/write the DLL and it's written in C it becomes easy to recode certain functions/behaviours

Even though this all sounds great, it is a lot of work because to intercept and call functions inside the EXE, you need a good knowledge of the functions and structure-layouts inside the EXE. That's what the API is for, it exposes interesting functions in a more readable fashion, so you don't need to think about the assembler and internals.

This screenshot shows how to configure the API for the default test project. There are 3 batch files you can use : cfg, b and r. cfg to configure the environment, b to build to the project, r to run the project. Also refer to this screenshot:
UoDemoDLL cfg.png
UoDemoDLL cfg.png (19.73 KiB) Viewed 11677 times

You should edit cfg.cmd to ensure your build environment is correct with your computer.

Use b and then r to test, if you successfull you get this :
b & r = cheat console.png
b & r = cheat console.png (103.03 KiB) Viewed 11677 times


Download the project here:

In the next days I will post more examples and cool techniques. Take care, till then.
<Derrick> RunUO AI is kind of a functional prototype, which i have hacked into something resembling OSI behavior, but only by complitcating everything

Posts: 2
Joined: Thu Jul 04, 2013 1:45 am
PostPosted: Thu Jul 04, 2013 2:57 am

Posts: 2
Joined: Thu Jul 04, 2013 1:45 am
PostPosted: Thu Jul 04, 2013 4:06 am
I do have UO98 working with the unencrypted 1.25.35 client now. I couldn't exactly tell you why but it does. That's why i still wanna figure it out. So I'd still like a nudge in the right direction.

Site Admin
Posts: 372
Joined: Wed Apr 08, 2009 6:35 am
PostPosted: Tue Jul 09, 2013 7:41 am
Bambino,

If you still experience problems with the batch file, maybe some screenshots of what happens or does not happen could help us in providing you with a solution. Also, copy/paste the complete contents of the batch file(s) you modified so I can replicate your configuration.
<Derrick> RunUO AI is kind of a functional prototype, which i have hacked into something resembling OSI behavior, but only by complitcating everything

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