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The user interface is implemented in the ImageDialog class. The public part of the class declaration, shown in Listing 13-6, consists of a constructor and a set of slots, where each slot represents a user action. What can the user do Looking at the class declaration and Figure 13-1 you can see a number of possible user actions. The following lists them and their corresponding slots: Move between the images: nextClicked and previousClicked Change the selection in the list of tags: tagsChanged Add a new image: addImageClicked Add a new tag: addTagClicked Add to this list the inherited tasks, such as being able to close the dialog to exit the application. Listing 13-6. Half of the ImageDialog class declaration class ImageDialog : public QDialog { Q_OBJECT public: ImageDialog(); private slots: void nextClicked(); void previousClicked(); void tagsChanged(); void addImageClicked(); void addTagClicked(); ... };

When developing your screen-scraping algorithm, test against a copy of their web page that you save to disk, instead of doing an HTTP round-trip with every test And always be aware that excessive use can result in your IP being temporarily or permanently blocked from a site if its owners are sensitive to automated sources of load..

The other half of the class declaration tells you something about how the application works (the source code is shown in Listing 13-7). It starts with four private support methods: selectedTags, updateImages, updateTags, and updateCurrentImage. You will look at each one of them soon. After the methods, the Designer-generated user interface class is included as ui before the member variables used for keeping track of the images. The imageIds list contains the id values for the images that are shown according to the selected tags. The currentImage is an index into the imageIds list that indicates which image is active. Finally, the images variable is an instance of the ImageCollection class that handles the database. Listing 13-7. The private half of the ImageDialog class declaration class ImageDialog : public QDialog { ... private: QStringList selectedTags(); void updateImages(); void updateTags(); void updateCurrentImage(); Ui::ImageDialog ui; QList<int> imageIds; int currentImage; ImageCollection images; };

With IMAP, the FETCH command is used to download mail, which IMAPClient exposes as its fetch() method. The simplest way to fetch involves downloading all messages at once, in a single big gulp. While this is simplest and requires the least network traffic (since you do not have to issue repeated commands and receive multiple responses), it does mean that all of the returned messages will need to sit in memory

The ImageDialog was created using Designer, so you can start by having a look at it (Figure 13-3 shows the basic design of the dialog). Apart from the text properties and the names of the different widgets, the only property that was altered is the SelectionMode of the QListWidget; it was set to MultiSelection.

using the customer s Flickr user ID. Once users find photos they are interested in, they can annotate the picture with dialog balloons.

Figure 13-3. The design of the image dialog Figure 13-4 shows the object hierarchy of the dialog (you can also see the names of the different widgets). The only thing not apparent is that the layout of the dialog itself is a grid layout.

together as your program examines them For very large mailboxes whose messages have lots of attachments, this is obviously not practical! Listing 15 6 downloads all of the messages from my INBOX folder into your computer s memory in a Python data structure, and then displays a bit of summary information about each one Listing 15 6 Downloading All Messages in a Folder #!/usr/bin/env python # Foundations of Python Network Programming - 15 - mailbox_summarypy # Opening an IMAP connection with IMAPClient and retrieving mailbox messages import email, getpass, sys from imapclient import IMAPClient try: hostname, username, foldername = sysargv[1:] except ValueError: print 'usage: %s hostname username folder' % sysargv[0] sysexit(2) c = IMAPClient(hostname, ssl=True) try: clogin(username, getpassgetpass()) except cError, e: print 'Could not log in:', e sysexit(1) cselect_folder(foldername, readonly=True) msgdict = cfetch('1:*', ['BODYPEEK[]']) for message_id, message in msgdict.

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