Qt: Correct way to post events to a QThread?

Question

In my Qt application, I have a main thread and a worker thread. The worker thread subclasses QThread and processes events via customEvent. Is this the

Answer 1

Your understanding is correct and is indeed very unintuitive :)

A lot of the trouble comes from the documentation for QThread that suggests subclassing QThread. Although Qthread has its own event loop, only events and signals for QObjects created in the run() method (created in that thread) will be processed in the QThread event loop.

It is much better to encapsulate your thread logic in a QObject subclass and then move that object to an instance of a plain QThread. You can then communicate with that QObject using signals (which will be correctly queued across thread boundaries) or custom events.

There are some links in this similar question that should help.