When you posted this message, did you see that big, red sign that said:
IF YOU ARE LOOKING FOR CODE DO NOT ASK "Where can I find the code for this book?" That question is answered here.
Follow the link at the top of this thread for an explanation of what happened to the source.
Short version: many years ago, the old Wrox went under. Some books and the Wrox brand were bought by Wiley, others by APress. I think your book was bought by APress so you'll need to look at their site for the source. However, there may be a chance the source is no longer available at all as they state the following on their web site:
The source code downloads that accompany books published by Wrox are no longer supported on this site. We apologize for any inconvenience.