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All widgets and user interface objects must be handled from the main thread (the thread where QApplication::exec is called). This means that all user interfaces will act as some sort of consumer being fed information to visualize from the threads performing the actual work. The benefit of splitting the application into these parts is that the user interface does not freeze when the application encounters heavy tasks. Instead, some QAction objects might be disabled while the processing is done in another thread. When the result is ready, it is fed back to the main thread through a buffer, a custom event, a shared buffer, or some other mechanism.

ETRN STARTTLS XVERP 8BITMIME send: 'mail FROM:<foo@examplecom> size=157\r\n' reply: '250 Ok\r\n' reply: retcode (250); Msg: Ok send: 'rcpt TO:<jgoerzen@completeorg>\r\n' reply: '250 Ok\r\n' reply: retcode (250); Msg: Ok send: 'data\r\n' reply: '354 End data with <CR><LF><CR><LF>\r\n' reply: retcode (354); Msg: End data with <CR><LF><CR><LF> data: (354, 'End data with <CR><LF><CR><LF>') send: 'To: jgoerzen@completeorg\r\n From: foo@examplecom\r\n Subject: Test Message from simplepy\r\n \r\n Hello,\r\n \r\n This is a test message sent to you from simplepy and smtplib \r\n \r\n' reply: '250 Ok: queued as 8094C18C0\r\n' reply: retcode (250); Msg: Ok: queued as 8094C18C0 data: (250, 'Ok: queued as 8094C18C0') Message successfully sent to 1 recipient(s) From this example, you can see the conversation that smtplib is having with the SMTP server over the network.

To show a simple user interface that is updated with data from a thread, you ll replace the TextDevice class from the TextAndNumber application with a dialog. The passing of data from the TextThread producers is done via signal-to-slot connections. The running application is shown in Figure 12-2.

Now that we have written the code and defined the block in a block definition file, we are ready to return to Popfly to test the code in a mashup. It will also give us an opportunity to explore block development using Popfly s block creator.

As you implement code that uses more advanced SMTP features, the details shown here will be more important, so let s look at what s happening First, the client (the smtplib library) sends an EHLO command (an extended successor to a more ancient command that was named, more readably, HELO) with your hostname in it The remote server responds with its hostname, and lists any optional SMTP features that it supports Next, the client sends the mail from command, which states the envelope sender e-mail address and the size of the message The server at this moment has the opportunity to reject the message (for example, because it thinks you are a spammer); but in this case, it responds with 250 Ok (Note that in this case, the code 250 is what matters; the remaining text is just a human-readable comment and varies from server to server.

Figure 12-2. The TextDialog in action The class declaration of the dialog class can be seen in Listing 12-37. The dialog class is called TextDialog and accepts TextAndNumber objects through the showText slot. There are more things to learn from the class declaration. You can see that the dialog uses a design made using Designer because it contains a Ui::TextDialog member variable. It also has a private slot that is intended to be connected to a user interface signal called buttonClicked.

) Then the client sends a rcpt to command, with the envelope recipient that we talked so much about earlier in this chapter; you can finally see that, indeed, it is transmitted separately from the text of the message itself when using the SMTP protocol If you were sending the message to more than one recipient, they would each be listed on the rcpt to line Finally, the client sends a data command, transmits the actual message (using verbose carriagereturn-linefeed line endings, you will note, per the Internet e-mail standard), and finishes the conversation The smtplib module is doing all this automatically for you in this example In the rest of the chapter, we will look at how to take more control of the process so you can take advantage of some more advanced features..

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