Error in using pcap loop with mysql con as My argument - mysql

Question

I want to add the mysql connection with the pcap loop which I am using in the code
MYSQL *con;
u_char *my_arguments = con;
pcap_loop(handle, total_packet_count, my_packet_handler, my_arguments);
but it is giving error
warning: initialization from incompatible pointer type
[-Wincompatible-pointer-types]
u_char *my_arguments = con;^~~
SO what should I do help is needed please
When I am directly putting value of con in pcap loop like pcap_loop(handle, total_packet_count, my_packet_handler, con); it is showing new error
Error is
passing argument 4 of ‘pcap_loop’ from incompatible pointer type
[-Wincompatible-pointer-types]
pcap_loop(handle, total_packet_count, my_packet_handler, con);
note: expected ‘u_char * {aka unsigned char *}’ but argument is of type ‘MYSQL * {aka struct st_mysql *}’
PCAP_API int pcap_loop(pcap_t *, int, pcap_handler, u_char *);
but I want it to be pushed in pcap loop

Answer 1

The "user" argument to pcap_loop(), pcap_dispatch(), and the callback probably should have been defined to be a void *, as it's a pointer to some arbitrary data that the callback understands, but it was defined to be a u_char * instead.
So you should cast the MYSQL * to u_char *:
pcap_loop(handle, total_packet_count, my_packet_handler, (u_char *)con);