MFC is not an IDE but a framework, like Qt, nor are Cocoa or GTK+, they are APIs or toolkits.
Why did you then? To create a faxing application? I assure you neither of the APIs mentioned by you implement faxing, so surely choosing Qt over those other mentioned APIs wasn't argumented by wanting a faxing class. Just link your Qt based application against chosen faxing library and use it in your program. You'll have to use platform dependent solutions, because there is no platform undependent solution for faxing.Why would I choose to use Qt then???
You can start here: http://www.hylafax.org and also search for "libfax".
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