lwip ip_addr - 存储大小

Question

I'm trying define "ip_addr" from lwip. That's my code:

#include "lwip/tcp.h"
#include "ip_addr.h"
...
struct ip_addr ip;

But when i'm trying to compile this, compiler gives me error:

error: storage size of 'ip' isn't known

Answer 1

Try:

ip_addr_t ip;

and your second #include line should it not be:

#include "lwip/ip_addr.h"