cpp2dot parses c++ header files and generates a dot (graphviz) UML graph. It is based on the moc tool from the Qt SDK. Feel free to ask me anything about it (mail or Tracker, but preffer to post on my blog : http://www.libertesalternatives.org)
It's pretty unhandy to use a command line tool on windows, you could have at least made a GUI for it since you're using QT. I do like the idea though, that's why I downloaded the source.