[Click] Accessing port values from header

[Daniel Braund]

Hi. I am running in circles trying to figure out how to extract the port value 
for a packet in a similar manner to the way I extract a packets source and 
destination addresses:

packet_src=iph->ip_src.s_addr;
packet_dst=iph->ip_dst.s_addr;

essentially I want to know if I can do something like

packet_port=iph->ip_dst.port;

I have looked, but cannot find a list or description of what values I can plug 
into here to gain the data I want. Does one exist somewhere? Also, s_addr I 
assume implies string, is there a binary/hex variant?

Thanks in advance for any insight you can offer me.

Daniel