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We will start by looking at how to create MIME messages. To compose a message with attachments, you will generally follow these steps: 1. 2. 3. 4. Create a MIMEMultipart object and set its message headers. Create a MIMEText object with the message body text and attach it to the MIMEMultipart object. Create appropriate MIME objects for each attachment and attach them to the MIMEMultipart object. Finally, call as_string() on the MIMEMultipart object to write out the resulting message.

What s this help looks very much like a tooltip, except the user has invoked the What s this mode and then clicked the widget of interest. The What s this mode is entered by clicking the question mark button that appears on the title bar of the dialog window if any widget has What s this help. The question mark button can be seen in Figure 9-5.

t= new TechnoratiClass() t.getSearchResults("Silverlight")

Figure 9-5. A dialog with the question mark button in the title bar The What s this help text tends to be slightly longer and more detailed than the tooltip text because the user usually wants to know a bit more about a widget. The What s this text is set using the setWhatsThis(const QString&) method and can be set for all widgets. Although the string passed as argument is very similar to the string passed as tooltip, there are some differences. The most important difference is line breaks. When specifying What s this texts it is important to use the <br /> tag, not the \n character to break the lines. Also, the What s this texts are always word-wrapped unless you explicitly specify the paragraph not to be wrapped. Figure 9-6 shows the same What s this text with and without word-wrapping. To avoid word-wrapping you must put the text in a paragraph tag with the attribute style='white-space:pre'. For example, the following line shows the word-wrapped text from the figure: checkBox->setWhatsThis( tr("This is a simple <i>What's This help</i> " "for the check box.") ); This piece of source code shows the same text without word-wrapping: checkBox->setWhatsThis( tr("<p style='white-space:pre'>This is a simple " "<i>What's This help</i> for the check box.</p>") ); Sometimes it can be useful to prevent word-wrapping, but try to let Qt handle it whenever possible. By letting Qt wrap the lines, the text is more likely to appear properly on the screen. Take the example of a low-resolution screen with a very large font size setting (see Figure 9-6). Your nonwrapped text might not fit the screen.

Take a look at Listing 12 8 for a program that implements this algorithm. You can see that parts of the code look similar to logic that we used to generate a traditional e-mail. After creating the message and its text body, the program loops over each file given on the command line and attaches it to the growing message. (If you run the program with an empty command line, then the message is simply printed without any attachments.) Listing 12 8. Creating a Simple MIME Message #!/usr/bin/env python # Foundations of Python Network Programming - 12 - mime_gen_basic.py # This program requires Python 2.5 or above from email.mime.base import MIMEBase from email.mime.multipart import MIMEMultipart from email.mime.text import MIMEText from email import utils, encoders import mimetypes, sys def attachment(filename): fd = open(filename, 'rb')

Figure 9-6. The same What s this text with and without word-wrapping When it comes to formatting, What s this help texts can handle all the tags that tooltip texts can. Figure 9-7 shows What s this help boxes demonstrating formatting and inline images. Although the word-wrapping is slightly different, the results are identical to the tooltip boxes.

mimetype, mimeencoding = mimetypes.guess_type(filename) if mimeencoding or (mimetype is None): mimetype = 'application/octet-stream' maintype, subtype = mimetype.split('/') if maintype == 'text': retval = MIMEText(fd.read(), _subtype=subtype) else: retval = MIMEBase(maintype, subtype) retval.set_payload(fd.read()) encoders.encode_base64(retval) retval.add_header('Content-Disposition', 'attachment', filename = filename) fd.close() return retval

horizontally (image.height()-1-y):y, image.pixel( x, y ) ); return result; } The Flip project isn t affected by the changes, so recompiling and installing the resulting plugin is all that s necessary to get things up and running.

message = """Hello, This is a test message from 12. I hope you enjoy it!

Click the Run button to see the results shown in Figure 9-14. After the call is made to the search operation of the Technorati API, the results are stored in an array of RSSItems. In 8, you also learned that the RSSItem has an operation called toString that is used to express the contents of the RSSItem as HTML. So after the XML from the search operation is returned, it is parsed into an array of RSSItems. Each one of the RSSItem s toString functions is called by the test harness to display the results in HTML.

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