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ROS does _NOT_ deprecates wx (, which is technically impossible because wx is externally hosted from ROS). ROS does so for some particular wx-based toolssuite rx. That said you are free to continue using your own wx-based program. Advantage of doing so especially in your case would be that you don't have to rewrite anything. If you decide to continue using wx, you can look at the source of rx tools.

For the particular error you mention about, I can't tell why it happens without looking at your Qt code.

And yes, if you choose to write in Qt, using its standard architecture like slot-signal is a good idea. If you extend it to rqt plugin, you get more benefits as described. This tutorial has a link to sample source of rqt plugin.