IP address

[post from old forum]

How can I learn my own ip address? By gethostname? Can anybody send me an example code?

bera

[post from old forum]

If all you need is to be able to connect to yourself, you should use the loopback address (127.0.0.1) to do it. If all you want is to open a socket for listening, you'd use INADDR_ANY or INADDR_LOOPBACK rather than needing the address.
If you really need the ip address, here's an example:

Code Select Expand


#include <stdio.h>
#define WIN32_LEAN_AND_MEAN
#include <winsock.h>

int main(void){
   char hname[512];
   WSADATA wsaData;
   struct hostent *he;
   int i = 0;
   if (WSAStartup(MAKEWORD(1,1),&wsaData) != 0) {
       printf("Error on WSAStartup()\n");
       return -1;
   }
   if (gethostname(hname,sizeof(hname)) == SOCKET_ERROR) {
       printf("Error on gethostname()\n");
       return -1;
   }
   he = gethostbyname(hname);
   if (he == 0) {
       printf("Error on gethostbyname()\n");
       return -1;
   }
   while (he->h_addr_list[i] != 0) {
       struct in_addr ia;
       memcpy(&ia,he->h_addr_list[i],sizeof(struct in_addr));
       printf("Local address found: %s\n",inet_ntoa(ia));
       i++;
   }
   WSACleanup();
   return 0;
}


Ako[/code]