pcap_loop

["m. kh " <kh12040 () yahoo fr>]

HI
how to use a the last argument of pcap_loop ?
in my program i use :
                     u_char *user;
                      user="the message ";
                      pcap_loop(handle, -1, (pcap_handler) callback , user);

but not succe ,help me
give me example ?
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