AutoIT read all files in directory

Hey all,

I had a few questions, I'm new to Autoit and programming in general, about a week in, I've written a fully functional script or program, most of the information I needed was from the wiki/help file and the forums so that was awesome.

I'd like to read all files ending with *.txt in a directory and use regex to pull only certain data. for instance, the first column of numbers up to a comma.

For example

\(^[0-9]+\),
Making this group 1, excluding the comma.
Then sum all the returned values.

This would be trivial in bash and I know autoit supports regex, could someone point me in the right direction?

Also,

Another newbie question, if I have a DLL file, for example imagesearch which I've used extensively, is it possible to port this to another programming language and use the same DLL but process the returned data in a method thats specific to the language? Say for example C#.

Is there any books or tutorials etc that someone can recommend to get more 'up to speed' on these kind of things?

Thanks,
DysFunction