The niDAQmx-linux branch (of the itom plugin repository) can be cloned by:
git clone https://bitbucket.org/dnessett/plugins/src/niDAQmx-linux/
or viewed by pasting the url into your browser.
This provides the source to all the itom plugins. The one you are interested in is niDAQmx.
If you want to study the plugin code you will need access to the itom repository code, where many of the data structures are defined:
git clone https://bitbucket.org/itom/itom/src/master/
There is good documentation at: https://itom.bitbucket.io/documentation.html, and within that, the developer documentation is located at: https://itom.bitbucket.io/latest/doxygen/index.html
Here are some comments that might help you study the code: 1) itom makes heavy use of both qt5 and opencv data structures (the latter is a computer vision application - itom started out focusing on computer vision); 2) itom is a large program complex and if your main interest is niDAQmx using QT, I wouldn't pay much attention to the other plugins; 3) most of the QT5 data structures are defined in the QT5 file tree - on my machine this is installed by yum and the header files are in /usr/include/qt5.
I will attempt to answer questions about the niDAQmx plugin, but for more general questions about itom, you can join the email discussion list to which you can subscribe at: https://sourceforge.net/p/itom/mailman/. There is an email archive at: https://sourceforge.net/p/itom/mailman/itom-discussions/
Cheers,
Dan
