Problem with Qt plugin system

[fullmetalcoder]

Why? If ExampleApp inherits directly from pkApplication the situation is similar to EchoPlugin example in the Qt documentation, isn't it?

Maybe "expected" wasn't the right word... "intuitive" would have been a wiser choice I guess.

plugin loading fails (it returns a null pointer instead of a pkApplication pointer).

Then I suppose my previous comment was accurate : QPluginLoader tries to cast the object to pkApplication using qobject_cast<> but as pkApplicationBase does not have the Q_INTERFACE macro this fails (qobject_cast does not work like dynamic_cast, it uses meta object data to check the validity of the cast and then "brute force" casting if the checks succeed).