How to get ip address from NetService - iphone

Question

When I get a NetService object，I try to do：
NSNetService *ss=[netArray objectAtIndex:indexPath.row];
ss.delegate=self;
[ss resolveWithTimeout:3.0];
On the delegate method：
-(void)netServiceDidResolveAddress:(NSNetService *)sender
{
NSArray *address=sender.addresses;
NSData *addressData=[NSData dataWithBytes:address length:sizeof(address)];
/*
How?
*/
}
Thanks.

Answer 1

// Sent when addresses are resolved
- (void)netServiceDidResolveAddress:(NSNetService *)netService
{
// Make sure [netService addresses] contains the
// necessary connection information
if ([self addressesComplete:[netService addresses]
forServiceType:[netService type]]) {
[services addObject:netService];
}
}
// Verifies [netService addresses]
- (BOOL)addressesComplete:(NSArray *)addresses
forServiceType:(NSString *)serviceType
{
// Perform appropriate logic to ensure that [netService addresses]
// contains the appropriate information to connect to the service
NSData *myData = nil;
myData = [addresses objectAtIndex:0];
NSString *addressString;
int port=0;
struct sockaddr *addressGeneric;
struct sockaddr_in addressClient;
addressGeneric = (struct sockaddr *) [myData bytes];
switch( addressGeneric->sa_family ) {
case AF_INET: {
struct sockaddr_in *ip4;
char dest[INET_ADDRSTRLEN];
ip4 = (struct sockaddr_in *) [myData bytes];
port = ntohs(ip4->sin_port);
addressString = [NSString stringWithFormat: #"IP4: %s Port: %d", inet_ntop(AF_INET, &ip4->sin_addr, dest, sizeof dest),port];
}
break;
case AF_INET6: {
struct sockaddr_in6 *ip6;
char dest[INET6_ADDRSTRLEN];
ip6 = (struct sockaddr_in6 *) [myData bytes];
port = ntohs(ip6->sin6_port);
addressString = [NSString stringWithFormat: #"IP6: %s Port: %d", inet_ntop(AF_INET6, &ip6->sin6_addr, dest, sizeof dest),port];
}
break;
default:
addressString=#"Unknown family";
break;
}
NSLog(#"Client Address: %#",addressString);
return YES;
}
This is the output
Client Address: IP4: 192.168.69.38 Port: 58612

Answer 2

I found a post which suggests the following solution.
NSString* addressString = [[NSString alloc] initWithData:addressData encoding:NSASCIIStringEncoding];
Though it does not output a human readable string for me... It might work for you.
This is what is written to the console when I print the NSData object.
<10026a5e 0a0a7893 00000000 00000000>
Meanwhile, I found out that the second segment is the hexadecimal form of the ip-address. In this example it is ...
10.10.120.147 // 0a0a7893
I have written a Host class that does the conversion. The NSString extension can be found here. I only use the first 16-bytes address and ignore all others. Feel free to extend the class.