Exposing the Dealer Text box on Pokerstars.

There are several threads floating around various forums from people trying to build poker bots with varying degrees of success. Inevitably they get stuck trying to get input from the poker software. The dealer boxes have all of the information in an easily regular-expression-ed pattern, but the control won't give up the text. Some have turned to OCR, and that works ok, but there has to be a better way.

Pokerstars is my particular favorite, so they get to be the guinea pig. I wrote the Support department, and they said they didn't have any APIs. They also pointed me quite firmly to the the Terms of Service which specifically permits data collection and specifically forbids the use of auto-playing bots.

So now, on to the puzzle.

First, the easy approach. Fire up WinSpy++ or Winspector and browse around the Pokerstars window. The Textbox of interest has a funny class name, AFX:4200:something. That's about it. When we watch the messages in and out of the window there are just a bunch of WM_PAINT messages. The application doesn't leak a lot of information on this approach.

Interesting. All that window does is WM_PAINT, redrawing the window. That means it has to be a graphical window, a bitmap of text, that just _looks_ like a control. Very Very sneaky Mr. Stars, very sneaky.

Time for another Tool, PEView. PeView decodes the PE format of the binary, and reveals the libraries and Functions the application is importing. Scanning the list, it looks like pretty standard stuff. GDI32.dll, the kernel, User32... some others. Looking through the list, we only care about functions with "text" in the name. These are in the DLLs GDI32 and User32.

Now if only there was a way to override and trap every call to those libraries and dig around for our text. Following the aforementioned example, we'd want that to be a free tool, and available within the first page of Google results. ;) Enter WinAPIOverride Running the inspector we attach to Pokerstars and monitor the calls for GDI, the graphics library. In there we can see the application creating Display components, bitmaps, and generating those paint messages, but no Dealer Text. Reloading and monitoring the User functions is much more interesting. Ah-ha! There they are big as day. The Pokerstars dealer messages are all created using the DrawText function. Minimized, maximized, they are all there.

So that is how Pokerstars does it, they create a bitmap of what the textbox looks like off screen, and then show the bitmap. To get it out, all you have to do is write an API hook for the USER32 dll and IPC those messages over to your application. For a simple hook, Take a look at this CodeProject article on dead simple API hooking. Looking at the source, you would only have to change about 7 lines (6 for the functions and 1 to make it hook Pokerstars.exe) in it to expose all of the Pokerstars text where any application can reach it. Magic. ;)

I need a copy of Visual Studio to I finish this, but the hard part is done. :(

Thanks for a fun Puzzle.

Elizabeth Greene

Installing DPPI EZ-GP Smartlist Accelerator on a Terminal Server

Data Presentation Products (DPPI) makes this great product called EZ-GP Smartlist Accelerator for Microsoft Dynamics Great Plains. It makes exporting Smartlists from GP an order of magnitude faster, and it intelligently formats them for printing too. Unfortunately, it doesn't work out of the box on a terminal server. Here is how to make it work.

Note: The software requires GP to load a chunk file, so everyone does have to close the GP application briefly.

1. Login to the terminal server as a server admin
2. Run change user /install
3. Run the installer
4. Open GP
5. Answer "Yes" to the "Would you like to include new Code?" prompt.
6. Run a Smartlist
7. Export the Smartlist to verify Ez-GP is working.
8. Register EZ-GP. * (Skip this if you are using the Free Trial, Obviously. )
9. Close Excel and GP.
10. Move the x:\documents and settings\yourname\DPPI folder to x:\Program Files\DPPI
11. Give the users permissions to the x:\Program Files\DPPI folder.
12. Open Regedit
13. Navigate to Hkey_Local_Machine\Software\DPPI\TabFileParse
14. Update the InstallFolder to x:\Program Files\DPPI\Xcelerator
15. Update the WorkDirectory to F:\Program Files\DPPI\Xcelerator\Work
16. Run change user /execute
    
17. All done, test it as an unpriviledged user.
    

For the permissions, full control of the directory works. That could be tightened up, but determining the minimum permissions required is beyond the scope of this post.

Good Luck, and please comment if this article helped you.

-Elizabeth Greene