Callback Type for Asynchronous Messaging

When you call the MQCreateAsyncMessageConsumer() function or the MQCreateAsyncDurableMessageConsumer() function, you must pass the name of an MQMessageListenerFunc type callback function that is to be called when the consumer receives a message to the specified destination.

The MQMessageListenerFunc type has the following definition:

MQError (* MQMessageListenerFunc)(
                const MQSessionHandle  sessionHandle,
                const MQConsumerHandle  consumerHandle,
                MQMessageHandle  messageHandle
                void * callbackData);