How to dequeue a message automatically by getting a notification

If there is some data falls in the queue table.How to dequeue a message automatically by getting a notification in my application side .
Below is the link i am following for enqueuing the message into a queue table, its happening successfully.
http://www.oratechinfo.co.uk/aq.html
I can see the message i enqueued in the queue table with the following query at the scheduled time. select user_data from queue_table;
And below is the link to C++ code to dequeue the message.With the below c++ code i am able to dequeue the data manually in my application side.But i want a method to dequeue automatically by getting a notification and start to dequeue automatically.Please give me a hand and make it clear.
http://docs.oracle.com/cd/A83908_02/NT816EE/DOC/nt.816/a99999/o4c00069.htm

If its possible from PL/SQL side please share the code.

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