Finding local ip address in the iphone

Question

Possible Duplicate:
How do I query the iPhone's current IP address?

I'm trying to find the local ip address using gethostname/gethostbyname but I always get "Unable to Resolve" when doing it.

Why could it be failing? Are there other way to get the local ip address in the iphone?

Thx a lot

score 3 · Answer 1 · answered Feb 09 '09 at 11:23

3

    -(NSString*)getAddress {
          char iphone_ip[255];
          strcpy(iphone_ip,"127.0.0.1"); // if everything fails
          NSHost* myhost =[NSHost currentHost];
          if (myhost)
          {
              NSString *ad = [myhost address];
              if (ad)
                  strcpy(iphone_ip,[ad cStringUsingEncoding: NSISOLatin1StringEncoding]);
          }

          return [NSString stringWithFormat:@"%s",iphone_ip]; 
     }

answered Feb 09 '09 at 11:23

Andy Jacobs

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I'm just curious, why bother with the C-string at all, as opposed to just using NSString from the beginning? – erikprice Feb 09 '09 at 11:44
i got the code from an online example i found. i'm not sure why they'd use a C-String – Andy Jacobs Feb 09 '09 at 15:18
@Andy Jacobs - Could you show us the URL? I'm curious about the why's and how's. – Kriem May 25 '09 at 12:25
http://appsamuck.com/day4.html – Andy Jacobs May 29 '09 at 13:00
15

this code NSHost* myhost =[NSHost currentHost]; will be rejected by Apple. – Biranchi Nov 25 '09 at 08:18
Same as `NSString *address = [[NSHost currentHost] address]; return (address ? address : @"127.0.0.1");`. As Biranchi said, `NSHost` is a private class. – Joost Dec 05 '09 at 23:10

score 2 · Answer 2 · answered Feb 09 '09 at 12:41

2

I found a solution using gethostname/gethostbyname in the Erica Sadun book. The trick is to append the ".local" suffix to the hostname before calling gethostbyname.

answered Feb 09 '09 at 12:41

ggarber

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Rog · Answer 3 · 2009-02-10T02:46:34.847

2

In addition to the other answers here, I would suggest reviewing the Reachability sample code on the ADC site.

edited Feb 10 '09 at 02:46

answered Feb 09 '09 at 17:19

Rog

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score 0 · Answer 4 · answered Oct 30 '09 at 07:36

0

NSHost is not found in iPhone OS Library, it is present in Mac OS Core Library.

I am getting 2 warnings

"warning: no '+currentHost' method found" "warning: no '-address' method found"

Any way to remove these warnings ???

answered Oct 30 '09 at 07:36

Biranchi

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score 0 · Answer 5 · answered May 25 '09 at 12:19

It's worth noting that many carriers (especially outside the "first world") hand out RFC1918 (usually 10.0.0.0/8) addresses and so doing a HTTP request to one of the services could be better (except, of course, that many carriers, out of necessity use multiple public addresses for large NAT pools)

Finding local ip address in the iphone

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