Now I can compile successfully. But there are some error and the value of
the error is -9, which means "Illegal value".
My code:
char hname[]="www.baidu.com";
struct ip_addr addr;
err_t err;
if ((err = netconn_gethostbyname((char*)(hname), &(addr))) == ERR_OK) {
printf("netconn_gethostbyname(%s)==", (char*)(hname));
ip_addr_debug_print(LWIP_DBG_ON, (&addr));
printf("\n");
} else {
printf("netconn_gethostbyname(%s)==%i\n", (char*)(hname), (int)(err));
}
And the output:
netconn_gethostbyname(www.baidu.com)==-9
So why the DNS can not work?
Bei Guan
2010/11/18 Bei Guan <[email protected]>
> Hi all,
>
> I have used the function netconn_gethostbyname in my program. I have set
> the #define LWIP_DNS 1 in lwipopts.h and I also have include the
> "lwip/api.h" before my main function. When I compile my program, it came
> cross an error message: undefined reference to `netconn_gethostbyname'. But
> some other function can be used successfully, such as netconn_connect.
>
> So anyone can give me advice. Thanks a lot!
>
>
> Bei Guan
>
>
>
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