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14.7 Accessing the social web
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Since the advent of Web 2.0, a new sort of internet presence has appeared. We call it the social web. This is an interconnected network of web servers that exchange information based on various well-known protocols. If you re building internet-driven programs, you may wish to connect to this web so that your users can become a part of it.
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14.7.1 Using web protocols
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To participate in the social web, clients need to speak a number of protocols, most of them built on top of HTML. These include Ajax, JSON, RSS, SOAP, and XML. Here s how to use each of them from your iPhone and iPad: Ajax Ajax is something that, as it turns out, you can largely ignore. It s usually used as part of a client/server setup, with HTML on the front side, but the
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The web: web views and internet protocols
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iPhone OS uses an entirely different paradigm. You can dynamically load material into labels or text views, and you can dynamically call up websites using the XML or HTML classes we ve discussed. There s no need for Ajax-type content as long as you have good control over what a server will output. You just need to remember some of the lessons that Ajax teaches, such as downloading small bits of information rather than a whole page. JSON JSON is perhaps the most troublesome protocol to integrate. It s important as a part of the social web, because it s one of the standardized ways to download information from a website. It also depends on your iPhone or iPad being able to understand JavaScript, which it doesn t (unless you do some fancy work with DOM and the WebKit, which are beyond the scope of this section). Fortunately, two JSON toolkits are already available: JSON Framework and TouchJSON. We ll look at an example of the latter shortly. RSS At the time of this writing, we re not aware of any RSS libraries for the iPhone and iPad. But as we ve already demonstrated in this chapter, it s easy to parse RSS using an XML parser. SOAP SOAP isn t as popular in the social web as most of the other protocols listed here, but if you must use it, you ll want a library. A number of SOAP libraries are written for Objective-C (though not necessarily for the iPhone and iPad), including SOAP Client and ToxicSOAP. XML XML is, as you ve seen, fully supported by the iPhone OS. But if you don t like how the default parser works and want an alternative, you should look at TouchXML. These libraries should all be easy to find with simple searches on the internet, but table 14.10 lists their current locations as of this writing.
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Library JSON Framework TouchJSON Soap Client ToxicSOAP TouchXML Location http://code.google.com/p/json-framework/ http://code.google.com/p/touchcode/ http://code.google.com/p/mac-soapclient/ http://code.google.com/p/toxic-public/ http://code.google.com/p/touchcode/ Table 14.10 Download sites for social protocol libraries
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Because of its importance to the social web, we ll pay some additional attention to
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JSON, using the TouchJSON library.
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14.7.2 Using TouchJSON
For this final example, we ll return to Core Location one more time, because GeoNames offers a lot of JSON information. You re going to use GeoNames to display the postal codes near a user s current location. Figure 14.5 shows our intended result
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Accessing the social web
by highlighting the postal codes near Apple headquarters, the location reported by the Simulator. In order to get to this point, you must first install this third-party library and make use of it.
INSTALLING TOUCHJSON
To integrate TouchJSON into your project, you must download the package from Google and move the source code into your project. The easiest way to do this is to open the TouchJSON download inside Xcode and copy the Source folder to your own project. Tell Xcode to copy all the files into your project as well. Afterward, you ll probably want to rename the copied folder from Source to TouchJSON. Then you need to include the header CJSONDeserializer.h wherever you want to use TouchJSON.
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