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Using a single file is the easiest approach, and with many applications, it is a perfectly acceptable one. You start off by creating a root object, usually an NSArray or NSDictionary, though your root object can also be based on a custom class when using archiving. Next, you populate your root object with all the program data that needs to be persisted. Whenever you need to save, your code rewrites the entire contents of that root object to a single file. When your application launches, it reads the entire contents of that file into memory, and when it quits, it writes out the entire contents. This is the approach we ll use in this chapter. The downside of using a single file is that you have to load all of your application s data into memory, and you have to write all of it to the file system for even the smallest changes. If your application isn t likely to manage more than a few megabytes of data, this approach is probably fine, and its simplicity will certainly make your life easier.

As usual, the code starts with the using declarations: using using using using using using System; System.Data; System.Data.SqlClient; System.Data.SqlTypes; Microsoft.SqlServer.Server; System.Text.RegularExpressions;

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The multiple file approach is definitely more complicated. As an example, you might write an e-mail application that stored each e-mail message in its own file. There are obvious advantages to this method. It allows the application to load only data that the user has requested (another form of lazy loading), and when the user makes a change, only the files that changed have to be saved. This method also gives you the opportunity to free up memory when you receive a low-memory notification, since any memory that is being used to store data that the user is not currently looking at can be flushed and simply reloaded from the file system the next time it s needed. The downside of multiple-file persistence is that it adds a fair amount of complexity to your application. For now, we ll stick with single-file persistence.

One method that can be leveraged for sending binary attachment is embedding the binary data as a Base64-encoded stream. This is a simple method, which is directly supported by the xs:base64Binary XML schema type. However, it has some significant drawbacks. The first is the additional overhead with the encoding/decoding of the binary data, which adds processing cost. The other potentially more significant issue is that the Base64 algorithm can increase the payload size by approximately 33 percent.2 Although Base64 method is effective for sending binary data, the overall issues related to size can impact the performance of services. Given that the web service response is generally buffered prior to transmission, large objects will consume memory resources in addition to the CPU overhead of encoding. Also, direct embedding of the binary resource inside the XML document impacts the performance of XML parsers, which are now required to buffer or read past the embedded data in order to obtain other elements and values.

Let s get into the specifics of each of our persistence methods: property lists, object archives, SQLite3, and Core Data. We ll explore each of these in turn and build an application that uses each mechanism to save some data to the iPhone s file system. We ll start with property lists.

Several of our applications have made use of property lists, most recently when we used a property list to specify our application preferences. Property lists are convenient, because they can be edited manually using Xcode or the Property List Editor application, and both NSDictionary and NSArray instances can be written to and created from property lists as long as the dictionary or array contains only specific serializable objects. A serialized object has been converted into a stream of bytes so it can be stored in a file or transferred over a network. Although any object can be made serializable, only certain objects can be placed into a collection class, such as an NSDictionary or NSArray, and then stored to a property list using the collection classes writeToFile:atomically: method. The Objective-C classes that can be serialized this way are

SOAP with Attachments (SwA)

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