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Of these flags, servers are only required to return FLAGS, EXISTS, and RECENT, though most will include at least UIDVALIDITY as well. Listing 15 5 shows an example program that reads and displays the summary information of my INBOX mail folder.

Each parent takes responsibility for calling delete on its children, so as long as you make sure to delete the ancestor to all objects, all objects are deleted Qt has classes for handling the tasks that usually are handled by the C++ standard template library, STL The Qt equivalents are more adapted to be used in combination with Qt, but can interact with their STL equivalents with ease For handling text, use the QString class It supports Unicode and interacts well with the QStringList class The string list class offers methods for search and replace in all strings contained in the list as well as for joining the strings with a delimiter of your choice For keeping lists of any sort of object, Qt has the template classes QList, QLinkedList, and QVector All have pros and cons, but QList is usually the right choice.

Listing 15 5. Displaying Folder Summary Information #!/usr/bin/env python # Foundations of Python Network Programming - 15 - folder_info.py # Opening an IMAP connection with IMAPClient and listing folder information. import getpass, sys from imapclient import IMAPClient try: hostname, username = sys.argv[1:] except ValueError: print 'usage: %s hostname username' % sys.argv[0] sys.exit(2) c = IMAPClient(hostname, ssl=True) try: c.login(username, getpass.getpass()) except c.Error, e: print 'Could not log in:', e sys.exit(1) else: select_dict = c.select_folder('INBOX', readonly=True) for k, v in select_dict.items(): print '%s: %r' % (k, v) c.logout() When run, this program displays results such as this: $ ./folder_info.py imap.example.com brandon@example.com Password: EXISTS: 3 PERMANENTFLAGS: ('\\Answered', '\\Flagged', '\\Draft', '\\Deleted', '\\Seen', '\\*') READ-WRITE: True UIDNEXT: 2626 FLAGS: ('\\Answered', '\\Flagged', '\\Draft', '\\Deleted', '\\Seen') UIDVALIDITY: 1 RECENT: 0 That shows that my INBOX folder contains three messages, none of which have arrived since I last checked. If your program is interested in using UIDs that it stored during previous sessions, remember to compare the UIDVALIDITY to a stored value from a previous session.

When inserting items in the middle of a very large list, use QLinkedList when constant time insertions and quick sequential access are required QVector is good at random access and when items are required to be stored in order in contiguous memory For queues and stacks, the QQueue and QStack classes work well; they offer quick insertion and access from the ends indicated by their name When you use a stack, you push and pop to the top; when you use a queue, you enqueue items on the tail and dequeue them from the head The QMap and QHash classes associate items with keys The QHash class sorts the items in an arbitrary order while performing slightly faster than the QMap class The map always sorts the items by key For managing several items per key, it is best to use the QMultiMap or QMultiHash classes.

Markovic.com (http://www.markovic.com/markovic.com/ebay/search-virtual-earth.php) is a mashup that displays items for sale on eBay and the seller s location using Microsoft Virtual Earth; see Figure 1-6. The mashup communicates (using SOAP and REST) with the eBay API to enable customers to search for items they are interested in buying. A list is returned in XML format that enables the developer to plot the location of the seller and display it using the Virtual Earth API.

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