public virtual void setMessageListener(
    qa_const_string address,
    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.

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.