is it possible?
Yes, but the question is why do you want to mix MFC and Qt?
You better stay with one of the two all the way, mixing them is asking for trouble.
if yes how will i need to declare the class,object and include what headers in my initialization func of my mfc main class?
Qt is a library, just like any other (in general).
So you will have to link to Qt.
As long as you don't use signals and slots, and really just use QSettings, you might get away with out the need to construct QCoreApplication object.
You will have to include <QSettings>.
For using QSettings, read here : QSettings.
There may come some other problems - you are welcome to try and see.