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Unpack this directory into your PYTHONPATH. test with: trial --reactor=qt4 twisted (or twisted.test or twisted.test.test_internet) = Contributors = Many thanks to Darren Dale who provided the patch to fix the reactor for Qt4.4 = Using the Qt4Reactor = In your own code, BEFORE you import the reactor... app = QApplication(sys.argv) import qt4reactor qt4reactor.install() = Gui = There is a way to run trial using a gui... in bin, there is a routine gtrial. Put that in the same directory as trial and it pops up a trivial gui... hit the buton and it all runs the same... don't use the --reactor option when calling gtrial... but all the other options appear to work. This was just to make sure there wasn't anything strange with guis which there doesn't appear to be If you're writing a conventional Qt application and just want twisted as an addon, you can get that by calling reactor.runReturn() instead of run(). This call needs to occur after your installation of of the reactor and after QApplication.exec_() (or QCoreApplication.exec_() whichever you are using. reactor.run() will also work as expected in a typical twisted application more docs in qt4reactor.py Note that if a QApplication or QCoreApplication instance isn't constructed prior to calling reactor run, an internally owned QCoreApplication is created and destroyed. This won't work if you call runReturn instead of run unless you take responsibility for wacking QCoreApplication yourself... However, most users want this reactor to do gui stuff so this shouldn't be an issue. Performance impact of Qt has been reduced by minimizing use of signaling which is expensive. 186s for qt4reactor vs 180s for select for entire twisted trial suite. -glenn -- Glenn H. Tarbox, PhD email@example.com