public virtual void setMessageListenerBySelector(
    qa_const_string address,
    qa_const_string selector,
    QAMessageListener * listener
)

The listener is an instance of a class implementing QAMessageListener::onMessage, the only method defined in the QAMessageListener interface. QAMessageListener::onMessage accepts a single QAMessage parameter.

The setMessageListener address parameter specifies a local queue name used to receive the message. You can only have one listener assigned to a given queue. The selector parameter specifies a selector to be used to filter the messages to be received on the given address.

If you want to listen for QAnywhere system messages, including push notifications and network status changes, specify "system" as the queue name. Use this method to receive message asynchronously.

For more information, see Receiving messages asynchronously and System queue.