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iphonenetwork-programmingiphone-privateapinshost

Alternatives to NSHost in iPhone app

I'm currently using this code

    NSHost *host = [NSHost hostWithAddress:hostname];
if (host == nil) {
    host = [NSHost hostWithName:hostname];
    if (host == nil) {
        [self setMessage:@"Invalid IP address or hostname:"];
        return;
    }
}

to retrive my IP Address for a networking app I'm working on, however I'm aware that NSHost is a private API that will be rejected. Can anyone help me with working this code to produce the same results without using NSHost? I'm not really sure where to start.

EDIT:

Following suggestions that seem damn near perfect below I've added this code into my app in the place of the code above

    Boolean result;
CFHostRef hostRef;
CFArrayRef addresses;
NSString *hostname = @"www.apple.com";
hostRef = CFHostCreateWithName(kCFAllocatorDefault, (CFStringRef)hostname);
if (hostRef) {
    result = CFHostStartInfoResolution(hostRef, kCFHostAddresses, NULL); // pass an error instead of NULL here to find out why it failed
    if (result == TRUE) {
        addresses = CFHostGetAddressing(hostRef, &result);
    }
}
if (result == TRUE) {
    NSLog(@"Resolved");
} else {
    NSLog(@"Not resolved");
}

I've removed the 4th line (as I have this information from elsewhere already) but I get errors being based around CFHostRef being undeclared. How would I resolve that? It seems to be my only big hurdle, as other errors are only based upon the lack of being able to see hostRef after that. EDIT: Scratch that I also get kCFHostAddresses undeclared.

Solution

  • http://developer.apple.com/iphone/library/qa/qa2009/qa1652.html

    Got a great little answer through the Developer Support system, this worked perfectly.