[Qt-interest] question from a student who interests in Qt

[Benjamin Lau]

The signals are not emitted because the source objects aren't doing
any work. For instance, if you want QDns to emit the connected signal,
you need to call the member functions that will do the work to result
in the connected signal being emitted. At this point all your
constructor does is construct these objects, and then nothing is being
done with them.

Hope this helps
Benjamin