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Figure 13-1. The Image Book application in action The database used in the application (shown in Figure 13-2) consists of two tables: one for the tags and one for the images (called tags and images, respectively). The images table keeps one image per row. The rows each contain an INTEGER called id that is used to identify each image. The images are stored in a BLOB column called data alongside each id. A BLOB is a binary large object, which pretty much means anything. The application stores the images in PNG format in this column. The tags table consists of an INTEGER column called id and a VARCHAR column called tag. The id column connects the tags to the different images. Notice that there can be several tags for each image.

Most IMAP commands that work with messages can work with one or more messages. This can make processing far faster if you need a whole group of messages. Instead of issuing separate commands and receiving separate responses for each individual message, you can operate on a group of messages as a whole. The operation works faster since you no longer have to deal with a network round-trip for every single command. When you supply a message number, you can instead supply a comma-separated list of message numbers. And, if you want all messages whose numbers are in a range but you do not want to have to list all of their numbers (or if you do not even know their numbers maybe you want everything starting with message one without having to fetch their numbers first), you can use a colon to separate the start and end message numbers. An asterisk means and all of the rest of the messages. Here is an example specification: 2,4:6,20:* It means message 2, messages 4 through 6, and message 20 through the end of the mail folder.

The application is split into two major parts: the user interface class and the database interface class. The user interface uses the database interface to access the classes from the QtSql module. The user interface is contained in the ImageDialog class, and the database interface is found in the ImageCollection class. By splitting the code that uses SQL into a specific class, you avoid having SQL strings throughout the source code. There are several reasons to split the code containing SQL from the rest of the code. First of all, that part of the code can be tested in detail, which is important since any syntax errors in the SQL statements are detected first at run-time. It is convenient to convert between the types used in the database and Qt s classes in one place. And when you change database engines, it might be necessary to review and update some of the SQL statements used.

When you first select a folder, the IMAP server provides some summary information about it about the folder itself and also about its messages. The summary is returned by IMAPClient as a dictionary. Here are the keys that most IMAP servers will return when you run select_folder(): EXISTS: An integer giving the number of messages in the folder FLAGS: A list of the flags that can be set on messages in this folder RECENT: Specifies the server s approximation of the number of messages that have appeared in the folder since the last time an IMAP client ran select_folder() on it. PERMANENTFLAGS: Specifies the list of custom flags that can be set on messages; this is usually empty. UIDNEXT: The server s guess about the UID that will be assigned to the next incoming (or uploaded) message UIDVALIDITY: A string that can be used by clients to verify that the UID numbering has not changed; if you come back to a folder and this is a different value than the last time you connected, then the UID number has started over and your stored UID values are no longer valid. UNSEEN: Specifies the message number of the first unseen message (one without the \Seen flag) in the folder

Figure 1-5. API News + Google Maps: mashup of the Associated Press RSS feed, Yahoo Geo-encoding, and Google Maps

Slots can be public, protected, or private These sections are labeled as public slots:, protected slots:, or private slots: Signals are signal prototypes and are placed after the signals: label Slots are implemented as any other member function, although you never implement signals just declare them in the class definition and let the meta-object compiler handle the details When connecting signals and slots, remember that the connect method cannot handle argument values, only argument types The values of the arguments must come from the emitting object When using signals and slots, you must inherit QObject and start the class declaration with the Q_OBJECT macro This adds the required code and tells the meta-object compiler that the class needs a meta-object As soon as you have inherited QObject, you can assign a parent to an object and any number of children.

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