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As you can see, these flags correspond roughly to the information that many mail readers visually present about each message. While the terminology may differ (many clients talk about new rather than not seen messages), the meaning is broadly understood. Particular servers may also support other flags, and those flags do not necessarily begin with the backslash. Also, the \Recent flag is not reliably supported by all servers, so general-purpose IMAP clients can treat it only as, at best, a hint. The IMAPClient library supports several methods for working with flags. The simplest retrieves the flags as though you had done a fetch() asking for 'FLAGS', but goes ahead and removes the dictionary around each answer: >>> c.get_flags(2703) {2703: ('\\Seen',)} There are also calls to add and remove flags from a message: c.remove_flags(2703, ['\\Seen']) c.add_flags(2703, ['\\Answered']) In case you want to completely change the set of flags for a particular message without figuring out the correct series of adds and removes, you can use set_flags() to unilaterally replace the whole list of message flags with a new one: c.set_flags(2703, ['\\Seen', '\\Answered']) Any of these operations can take a list of message UIDs instead of the single UID shown in these examples.

The RSS block retrieves the posts from my blog and passes them to the News Reader block. The News Reader block formats the data for display. Navigation buttons (Back and Next) to move to the next and previous posts appear at the bottom. A clever animation fades one post s text out and the next post s text in between navigations. Clicking Read More opens a browser window to the post s link, which was passed by the RSS block. Once you get the hang of it, the entire process of creating your mashup should take less than a minute that s what I call rapid development.

The getIds method deals with images from a tag point of view. It takes a QStringList of tags and returns a list of id values for the images that have at least one of the tags. If no tags are given to the method, it returns all image id values. This is why there are two different queries prepared in the source code shown in Listing 13-20. In the SQL statement handling one or more tags, the IN clause is used. Writing x IN (1, 2, 3) is equal to writing x=1 OR x=2 or x=3. Because the user interface ensures that the tags consist of only the letters a z, you can safely join them together and use them directly in the SQL query.

One last interesting use of flags is that it is how IMAP supports message deletion. The process, for safety, takes two steps: first the client marks one or more messages with the \Delete flag; then it calls expunge() to perform the deletions as a single operation. The IMAPClient library does not make you do this by hand, however (though that would work); instead it hides the fact that flags are involved behind a simple delete_messages() routine that marks the messages for you. It still has to be followed by expunge() if you actually want the operation to take effect, though: c.delete_messages([2703, 2704]) c.expunge() Note that expunge() will reorder the normal IDs of the messages in the mailbox, which is yet another reason for using UIDs instead!

Caution You should always try to avoid inserting strings manually into SQL statements; use bindValue

Searching is another issue that is very important for a protocol designed to let you keep all your mail on the mail server itself: without search, an e-mail client would have to download all of a user s mail anyway the first time he or she wanted to perform a full-text search to find an e-mail message The essence of search is simple: you call the search() method on an IMAP client instance, and are returned the UIDs (assuming, of course, that you accept the IMAPClient default of use_uid=True for your client) of the messages that match your criteria: >>> cselect_folder('INBOX') >>> csearch('SINCE 20-Aug-2010 TEXT Apress') [2590L, 2652L, 2653L, 2654L, 2655L, 2699L] These UIDs can then be the subject of a fetch() command that retrieves the information about each message that you need in order to present a summary of the search results to the user.

The SQL statement is ended by a GROUP BY clause, ensuring that you do not get more than one id. The results from the query are put together in a list of integers that is returned. Listing 13-20. Getting every id for a given set of tags (or every id if no tags are given) QList<int> ImageCollection::getIds( QStringList tags ) { QSqlQuery qry; if( tags.count() == 0 ) qry.prepare( "SELECT images.id FROM images" ); else qry.prepare( "SELECT id FROM tags WHERE tag IN ('" + tags.join("','") + "') GROUP BY id" ); if( !qry.exec() ) qFatal( "Failed to get IDs" ); QList<int> result; while( qry.next() ) result << qry.value(0).toInt(); return result; }

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