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This will display Hello World on the stage. It s a sprite, so you can position it using x and y properties. The second argument in the constructor, 32 , is the font size. A great resource for simple but effective UI elements is Keith Peters Minimal Comps (http://www.minimalcomps.com ). They are easy to use and superb for building quick prototypes with a low overhead.

The basic difference between the SMTPClientChannel and the SMTPServerChannel is that the latter registers itself with the POP3PollManager as a server. This means that the POP3Polling instance will constantly check for new e-mails. The server-side channel has to implement IChannelReceiver, which in turn inherits from IChannel again. These interfaces are shown in Listing 14-5. Listing 14-5. IChannel and IChannelReceiver public interface IChannel { string ChannelName { get; } int ChannelPriority { get; } string Parse(string url, ref String objectURI); } public interface IChannelReceiver: IChannel { object ChannelData { get; } string[] GetUrlsForUri(string objectURI); void StartListening(object data); void StopListening(object data); }

Launch the application and add users, orders, set transactions, and save points to test functionality (see Figure 4-12).

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It seems like all those noises and explosions have attracted some unwelcome attention! Just as the lander was leaving the rocky planet s outer atmosphere, it was spotted by an enemy UFO. Can the lander outfly it Run the LineOfSight SWF and try. It s a fun game of cat and mouse. If the lander is hiding behind the asteroid, the UFO can t see it. But as soon as there s a direct line of sight without obstruction between the lander and UFO, the UFO s red light switches on and it attacks. This works because a vector has been plotted between the lander and UFO. When the vector is unobstructed by the asteroid, the UFO can see the lander. Figures 7-5 and 7-6 illustrate the effect you ll notice when you run the SWF.

Click the isTransaction checkbox and add new users and orders, as shown in Figure 4-13.

The implementation of SMTPServerChannel itself is quite straightforward. Its constructor checks for the attributes specified in the configuration file and assigns them to local member variables. It also creates a ChannelDataStore object, which is needed for CAOs to communicate back with the server (that is, when creating a CAO using this channel, the server returns the base URL contained in this ChannelDataStore object). It then creates the sink chain and adds the SMTPServerTransportSink on top of the chain. This is different from the client-side channel, where the constructor only creates a chain of sink providers. This is because on the server side there is only a single sink chain per channel, whereas the client creates a distinct sink chain for each remote object. Finally the constructor calls StartListening() to enable the reception of incoming requests. using using using using using System; System.Collections; System.Runtime.Remoting.Channels; System.Runtime.Remoting; System.Runtime.Remoting.Messaging;

Figure 4-13. SQLiteManager application and isTransaction checkbox is checked. Once you click the Rollback button the transaction will reverse, as shown in Figure 4-14.

Figure 7-5. When the lander is hiding behind the asteroid, the UFO can t see it. The vector between the objects is obstructed. The UFO waits patiently for the lander to reemerge.

namespace SmtpChannel { public class SMTPServerChannel: BaseChannelWithProperties, IChannelReceiver, IChannel { private String _myAddress; private String _name; private String _smtpServer; private String _pop3Server; private String _pop3Username; private String _pop3Password; private int _pop3Pollingtime; private SMTPServerTransportSink _transportSink; private IServerChannelSinkProvider _sinkProvider; private IDictionary _properties; private ChannelDataStore _channelData; public SMTPServerChannel(IDictionary properties, IServerChannelSinkProvider serverSinkProvider) { _sinkProvider = serverSinkProvider; _properties = properties; _myAddress = (String) _properties["senderEmail"]; _name = (String) _properties["name"]; _pop3Server = (String) _properties["pop3Server"]; _smtpServer = (String) _properties["smtpServer"]; _pop3Username = (String) _properties["pop3User"];

One of the features that customers have come to expect from desktop applications is the ability to selfupdate. The application, on startup, should look for any updates to the code and then will download and install them if the user desires. AIR supports this through the Updater class, but there is still some user interface and networking work to be done to get it all to hang together. The first thing to do is to define a method where the server can indicate to the AIR application what the most recent version is and where the download is. To do this, you will use a simple XML file. An example of this is shown in the following:

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