NSNetService works fine, but can't get hostName, resolve causes error

I’m using Bonjour with an NSNetService to publish a server from my iPhone. It all works as expected, I can browse the pages I’m serving etc. However, on the iPhone I want to display the host name (i.e. the URL, like “myDevice.local.”), so that one can also enter the address manually in a browser (useful for clients missing a bonjour discovery service). My understanding is that calling the method [myNetService hostName] should give me that address. However, this call always returns nil. I read on some forum that I first should resolve the service, however both [myNetService resolve] and [myNetService resolveWithTimeout:10] call the delegate method

- (void)netService:(NSNetService *)sender didNotResolve:(NSDictionary *)errorDict;

with the error

  • NSNetServiceBrowser/Bonjour issues on iOS
  • Disconnecting with server immediately after connecting
  • How can I create a small Mac app that receives data over the WiFi network from an iOS app?
  • Transfer data between iOS and Android via Bluetooth?
  • After upgrading to Xcode 6.3, on launch I now get the error: “The Bonjour service could not be resolved.”
  • CFNetwork and Bonjour integration for iPhone to Mac integration
  • {
        NSNetServicesErrorCode = -72003;
        NSNetServicesErrorDomain = 10;

    which apparently means that it is already resolved. Again, all this is happening while i can use the service. Also I can get the port, the domain, and the type of the service. The only other strange thing is that the call [myNetService addresses] returns an empty array.

    I’m using SDK 3.1.3. Does anybody have an idea what I could be doing wrong?

    3 Solutions Collect From Internet About “NSNetService works fine, but can't get hostName, resolve causes error”

    You can get the hostname via [[NSProcessInfo processInfo] hostName] without resolving the netservice you just published.

    The [[NSProcessInfo processInfo] hostName] method was not useful for me for two reasons:

    • If celular data is active, it returns some weird hostname at my provider’s domain
    • If there’s only WiFi, the host name is ok, but all lower case

    The following code from http://iphoneappcode.blogspot.com/2012/05/how-to-get-device-ipaddess-in-iphone.html worked best for me, always returning the local host name with sensitive case:

    + (NSString *) hostname
        char baseHostName[256]; 
        int success = gethostname(baseHostName, 255);
        if (success != 0) return nil;
        baseHostName[255] = '\0';
        return [NSString stringWithFormat:@"%s.local", baseHostName];
         return [NSString stringWithFormat:@"%s", baseHostName];