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In the last part of 9, when we built the Presidents data model object, you saw an example of the process of loading archived data using NSCoder. In the Cocoa world, the term archiving refers to another form of serialization, but it s a more generic type that any object can implement. Any object specifically written to hold data (model objects) should support archiving. The technique of archiving model objects lets you easily write complex objects to a file and then read them back in. As long as every property you implement in your class is either a scalar like int or float or else is an instance of a class that conforms to the NSCoding protocol, you can archive your objects completely. Since most Foundation and Cocoa Touch classes capable of storing data do conform to NSCoding (though there are a few noteworthy exceptions like UIImage) archiving is actually relatively easy to implement for most classes. Although not strictly required to make archiving work, another protocol should be implemented along with NSCoding the NSCopying protocol, which is a protocol that allows your object to be copied. Being able to copy an object gives you a lot more flexibility when using data model objects. For example, in the Presidents application in 9, instead of that complex code we had to write to store changes the user made so we could handle both the Cancel and Save buttons, we could have made a copy of the president object and stored the changes in that copy. If the user tapped Save, we d just copy the changed version over to replace the original version.

Message Transmission Optimization Mechanism (MTOM)

The NSCoding protocol declares two methods, both required. One encodes your object into an archive; the other one creates a new object by decoding an archive. Both methods are passed an instance of NSCoder, which you work with very much like NSUserDefaults from

With the limitations of the attachment-oriented approaches, industry participants developed a new specification that alleviated many of the issues of past specifications while ensuring compatibility with the emerging WS-* standards. Along with MTOM, XML-binary Optimization Packaging (XOP) is managed by the WCF encoding class MtomMessageEncodingBindingElement. This is controlled by setting the messageEncoding attribute on the binding with alternatives of Text or Binary. Listing 13-8 is an example of an application configuration that establishes through the declarative model that MTOM encoding should be used. Listing 13-8. Using MTOM Through Configuration <system.serviceModel> <services> <service name="MtomSvc.MtomSample"> <endpoint binding="wsHttpBinding" contract="MtomSvc.IMtomSample" bindingConfiguration="MyBinding"/> </service> </services>

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the previous chapter. You can encode and decode both objects and native datatypes like ints and floats using key-value coding. A method to encode an object might look like this:

Tip SQL Server 2008 introduces the capability to compress the individual transactions being transmitted to

- (void)encodeWithCoder:(NSCoder *)encoder { [encoder encodeObject:foo forKey:kFooKey]; [encoder encodeObject:bar forKey:kBarKey]; [encoder encodeInt:someInt forKey:kSomeIntKey]; [encoder encodeFloat:someFloat forKey:kSomeFloatKey] }

<bindings> <wsHttpBinding> <binding name="MyBinding" messageEncoding="Mtom" /> </wsHttpBinding> </bindings> </system.serviceModel> In the configuration file shown in Listing 13-8, we ve applied the Mtom value to the messageEncoding attribute for the default settings of wsHttpBinding. This now tells the WCF framework that it should apply MTOM (with XOP) on the messages during normal channel processing inside the WSHttpBinding instance. The optimization of the content is then based upon how the XOP implementation is applied within WSHttpBinding by using the internal class System.ServiceModel.Channels.MtomMessageEncoder. What traverses the wire, across the chosen transport, is a series of MIME message consisting of a SOAP request and for the final response from the server a binary stream (marked as Content-Type: application/octet-stream). In the 13 sample code, MtomTest provides a WCF client and server using configuration, and WSHttpBinding does its message exchange, leveraging the MTOM capabilities of WCF. The sample code contains a single service method that returns an array of bytes, as shown in Listing 13-9. Listing 13-9. WCF GetFile Service Contract namespace MtomSvc { [ServiceContract()] public interface IMtomSample { [OperationContract( ProtectionLevel=System.Net.Security.ProtectionLevel.None)] byte[] GetFile( string fileName ); } public class MtomSample : IMtomSample { public byte[] GetFile( string fileName ) { byte[] result = File.ReadAllBytes( Path.Combine( AppDomain.CurrentDomain.BaseDirectory, fileName) ); return result; } } We ve taken the same method signature as illustrated in the WSE 3 example (Listing 13-7) that leveraged MTOM, and we defined an interface and provided an implementation in a concrete class. We ve also applied an OperationContract property of ProtectionLevel.None to the operation so the only protection is authentication (the alternatives being Sign and EncryptAndSign).

To support archiving in our object, we have to encode each of our instance variables into encoder using the appropriate encoding method, so we need to implement a method that initializes an object from an NSCoder, allowing us to restore an object that was previously archived. If you are subclassing a class that also conforms to NSCoding, you also need to make sure you call encodeWithCoder: on your superclass, meaning your method would look like this instead:

- (void)encodeWithCoder:(NSCoder *)encoder { [encoder encodeObject:foo forKey:kFooKey]; [encoder encodeObject:bar forKey:kBarKey]; [encoder encodeInt:someInt forKey:kSomeIntKey]; [encoder encodeFloat:someFloat forKey:kSomeFloatKey] [super encodeWithCoder:encoder]; }

s Check the requirements for running the samples on the MSDN site at http://windowssdk.msdn. Tip microsoft.com/en-us/library/ms751525.aspx. Many of the samples from the SDK, including this

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