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Let s now look at the source code of the ImageDialog class, starting from the constructor and user actions (The code run before the dialog is shown, the constructor, can be seen in Listing 13-8) It starts by setting up the user interface generated from the Designer file When the widgets are in place, it initializes currentImage to an invalid value to ensure that no image is visible before updating the tag list and the images to be shown When this is done, the connections are made Each button s clicked signal is connected to a corresponding slot The tag list s itemSelectionChanged signal is connected to the tagsChanged slot Listing 13-8 The constructor of the ImageDialog class ImageDialog::ImageDialog() { uisetupUi( this ); currentImage = -1; updateTags(); updateImages(); connect( connect( connect( connect( connect( } Remember that the updateCurrentImage method disables the Next, Previous, and Add Tag buttons.

items(): e = emailmessage_from_string(message['BODY[]']) print message_id, e['From'] payload = eget_payload() if isinstance(payload, list): part_content_types = [ partget_content_type() for part in payload ] print ' Parts:', ' 'join(part_content_types) else: print ' ', ' 'join(payload[:60]split()), '..' clogout() Remember that IMAP is stateful: first we use select_folder() to put us inside the given folder, and then we can run fetch() to ask for message content (You can later run close_folder() if you want to leave and not be inside a given folder any more) The range '1:*' means the first message through the end of the mail folder, because message IDs whether temporary or UIDs are always positive integers The perhaps odd-looking string 'BODYPEEK[]' is the way to ask IMAP for the whole body of the message.

The updateCurrentImage method is called from updateImages, which is called from the constructor This means that if the Next, Previous, or Add Tag buttons are clicked, there is a current image Looking at the slots, notice that three of them are fairly simple (see their implementations in Listing 13-9) First up is the pair nextClicked and previousClicked As discussed earlier, the currentImage variable acts as an index into the imageIds list of id values When a user clicks the Next button, the currentImage value is increased If the value is too large, it starts at zero again The same goes for the Previous button The value is decreased and starts from the other end of the list when needed The last simple slot is the tagsChanged slot, which is reached if the selection of tags is changed If they are changed, you need to get a new list of images.

The string 'BODY[]' means the whole message ; inside the square brackets, as we will see, you can instead ask for just specific parts of a message And PEEK indicates that you are just looking inside the message to build a summary, and that you do not want the server to automatically set the \Seen flag on all of these messages for you and thus ruin its memory of which messages the user has read (This seemed a nice feature for me to add to a little script like this that you might run against a real mailbox I would not want to mark all your messages as read!) The dictionary that is returned maps message UIDs to dictionaries giving information about each message As we iterate across its keys and values, we look in each message-dictionary for the 'BODY[]'.

The examples I have shown here are a very small representative sampling of the variety of mashups. The combinations of APIs are endless.

Calling updateImages takes care of that Listing 13-9 Three simple slots void ImageDialog::nextClicked() { currentImage = (currentImage+1) % imageIdscount(); updateCurrentImage(); } uipreviousButton, SIGNAL(clicked()), this, SLOT(previousClicked()) ); uinextButton, SIGNAL(clicked()), this, SLOT(nextClicked()) ); uiaddTagButton, SIGNAL(clicked()), this, SLOT(addTagClicked()) ); uiaddImageButton, SIGNAL(clicked()), this, SLOT(addImageClicked()) ); uitagList, SIGNAL(itemSelectionChanged()), this, SLOT(tagsChanged()) );.

key that IMAP has filled in with the information about the message that we asked for: its full text, returned as a large string. Using the email module that we learned about in 12, the script asks Python to grab the From: line and a bit of the message s content, and print them to the screen as a summary. Of course, if you wanted to extend this script so that you save the messages in a file or database instead, you can just omit the email parsing step and instead treat the message body as a single string to be deposited in storage and parsed later. Here is what it looks like to run this script: $ ./mailbox_summary.py imap.example.com brandon INBOX Password: 2590 "Amazon.com" <order-update@amazon.com> Dear Brandon, Portable Power Systems, Inc. shipped the follo ... 2469 Meetup Reminder <info@meetup.com> Parts: text/plain text/html 2470 billing@linode.com Thank you. Please note that charges will appear as "Linode.c ... Of course, if the messages contained large attachments, it could be ruinous to download them in their entirety just to print a summary; but since this is the simplest message-fetching operation, I thought that it would be reasonable to start with it!

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