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public partial class Page : UserControl { public Page() { InitializeComponent(); this.Loaded += new RoutedEventHandler(Page_Loaded); } void Page_Loaded(object sender, RoutedEventArgs e) { } }

Post Office Protocol 3 (POP3) is the most popular protocol used to retrieve e-mail from a mail server. If you re using an e-mail program that s installed on your computer (as opposed to webmail, such as Hotmail or Yahoo! Mail), it probably uses the POP3 protocol to communicate with the mail server that receives your mail from the outside world. With Ruby, it s possible to use the net/pop library to do the same things that your e-mail client can, such as preview, retrieve, or delete mail. If you were feeling creative, you could even use net/pop to develop your own anti-spam tools.

Note In this section, our examples won t run without adjustments, as they need to operate on a real mail

following class definition:

account. If you wish to run them, you would need to replace the server name, username, and passwords with those of a POP3/mail account that you have access to. Ideally, you ll be able to create a test e-mail account if you want to play with the examples here, or have a backup of your mail first, in case of unforeseen errors. That s because although you cannot delete mail directly from your local e-mail program, you might delete any new mail waiting on your mail server. Once you re confident of your code and what you want to achieve, you can then change your settings to work upon a live account.

Figure 1-11. SQL Server Modeling CTP listed in Add or Remove Programs In the Start button All Programs list, double-click on Intellipad. As it is loading, the Intellipad splash screen should display more or less as it appears in Figure 1-12.

The basic operations you can perform with a POP3 server are to connect to it, receive information about the mail an account contains, view that mail, delete the mail, and disconnect First, you ll connect to a POP3 server to see if there are any messages available for download, and if so, how many: require 'net/pop' mail_server = Net::POP3new('mailmailservernameherecom') begin mail_serverstart('username','password') if mail_servermailsempty puts "No mails" else puts "#{mail_servermailslength} mails waiting" end rescue puts "Mail error" end This code first creates an object referring to the server and then uses the start method to connect The entire section of the program that connects to and works with the mail server is wrapped within a begin/ensure/end block so that connection errors are picked up without the program crashing out with an obscure error Once start has connected to the POP3 server, mail_server.

mails contains an array of Net::POPMail objects that refer to each message waiting on the server You use Array s empty method to see if any mail is available; if so, the size of the array is used to tell how many mails are waiting You can use the Net::POPMail objects methods to manipulate and collect the serverbased mails Downloading all the mails is as simple as using the pop method for each Net::POPMail object: mail_servermailseach do |m| mail = mpop puts mail end As each mail is retrieved (or popped, if you will) from the server, the entire contents of the mail, with headers and body text, are placed into the mail variable, before being displayed on the screen To delete a mail, you can use the delete method, although mails are only marked for deletion later, once the session has ended: mail_servermails.