Slot function not being executed in connect

[DanH]

Well first, always test the result of connect():

bool success = connect(...);
Q_UNUSED(success);
Q_ASSERT(success);

bool success = connect(...);
Q_UNUSED(success);
Q_ASSERT(success);

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But I don't think that's your problem in this case. More likely datagrams aren't being sent to the localhost you're referencing.

[squidge]

Your thread is causing far more complexity than you need as well and is not required.

Also, don't use a QPixmap in your thread. They are for main gui thread only.