In case of Array of Strings, so DBus signature 'as ' Qt does all job for you. It is enough if you use QStringList as a type of your variable.

In case of most complex data like some structures with strings and integers etc. I think that you should define your own structure, create read/write operators for it, declare it as a new metatype and it should work.

Some documentation about it "QDBusArgument":http://doc.qt.digia.com/4.7-snapshot/qdbusargument.html

But you can also start from XML definition and then use code generation to genereate proxy client of your DBus methods. "Some documents":http://www.developer.nokia.com/Community/Wiki/QtDbus_quick_tutorial

BR,