find all files with a certain extention + folder control

[tommy]

Hi,

I have 2 questions:

1) I need to find all files in the current folder that have a *.txt extention. Then I want to sequentially open these files and use them.
What is the easiest files to get all filenames with a certain extention?
I would like to obtain these files sequentially - find one, do something, find another, do something etc.

2) How do you detect the presence or absence of folders and how do you create new folders with Qt?

Thanks a lot!