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Drawing QR in Objective-C Using TouchJSON

Listing 20.9 Using TouchJSON
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- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { [myLM stopUpdatingLocation]; [myActivity stopAnimating]; NSString *gnLookup = [NSString stringWithString:@"http://ws.geonames.org/findNearbyPostalCodesJSON lat=37.331689&lng=-122.030731"]; NSData *gnData = [NSData dataWithContentsOfURL: [NSURL URLWithString:gnLookup]]; NSError *error = nil;
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Summary
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NSDictionary *dictionary = [[CJSONDeserializer deserializer] deserializeAsDictionary:gnData error:&error];
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if(error) { postalLabel.text = [NSString stringWithFormat:@"Error: %@", [[error userInfo] objectForKey:@"NSLocalizedDescription"]]; } else { NSMutableString *postCodes = [NSMutableString stringWithString:@"Nearby post codes are:\n\n"]; for (int i = 0 ; i < [[dictionary objectForKey:@"postalCodes"] count] ; i++) { [postCodes appendFormat:@"%@ (%@)\n", [[[dictionary objectForKey:@"postalCodes"] objectAtIndex:i] objectForKey:@"postalCode"], [[[dictionary objectForKey:@"postalCodes"] objectAtIndex:i] objectForKey:@"placeName"]]; } postalLabel.text = postCodes; } }
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To access the JSON results, you first retrieve the data from a URL using the datawithContentsOfURL: method B, which was one of the ways we suggested for retrieving raw data earlier in the chapter. Then you plug that NSData object into the CJSONDeserializer C to generate an NSDictionary containing the JSON output. The TouchJSON classes are much easier to use than the XML parser we met earlier in this chapter. All you need to do is read through the arrays and dictionaries that are output. The downside is that the resulting dictionary may take up a lot of memory (which is why the XML parser didn t do things this way), so be aware of that if you re retrieving particularly large JSON results. Absent that concern, you should be on your way to using JSON and creating yet another link between your users iPhones and the whole world wide web.
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20.8 Summary
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There s more than one way to do it. That was the slogan of Perl, one of the first languages used to create dynamic web pages, and today you could equally use that slogan to describe the iPhone, one of the newest cutting-edge internet devices. We opened this book by talking about the two different ways that you could write iPhone programs: using web technologies and using the SDK. That also highlighted two different ways that you could interact with the internet: either as an equal participant a web-based member of the internet s various peer-to-peer and client-server protocols or as a pure iPhone client that runs its own programs and connects to the internet via its own means. We ve said before that each programming method has its own advantages, and we continue to think that web development is often a better choice when you re interacting
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The web: web views and internet protocols
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with the internet already, but when you need to use other SDK features, the SDK offers some great ways to connect to the web. As we ve seen in this chapter, you have easy and intuitive access to the social web that conglomeration of machines that s connected via various public protocols. You should have no trouble creating projects that use the HTML and XML protocols, and even further flung protocols like JSON and SOAP are usable thanks to third-party libraries. That ll cover most programmers needs, but for those of you who need to dig deeper, the SDK has you covered there too, thanks to Core Foundation classes. In coming full circle, returning to the web technologies that opened this book, we re also bringing this book to its end. But read on (if you haven t already) for some helpful appendixes that list numerous SDK objects, talk more about getting your projects ready for market, and point toward other resources.
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appendix A: iPhone OS class reference
After this book, your main resource for learning more about the iPhone should be the references at developer.apple.com. To help you find documents that might interest you, this appendix lists the major classes in the UIKit and Foundation hierarchies that you might want to know more about, excluding classes that only appear as a part of another class.
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