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errors. VWD has a built-in editor that provides a rich environment to create error-free XML documents. Stop debugging, and return to VWD and the Solution Explorer. Double-click the TechnoratiBlockDefinition.xml file to open it in the VWD editor. To take advantage of the features in VWD s editor, we need to attach the Popfly Block Definition XML schema file, called BlockSchema.xsd, to the document; you can find it in the root folder of the SDK ( XSD means XML schema definition). VWD uses these schema files to validate and help you create XML documents. XML schemas are a standard way to define the structure of an XML document. To attach the schema file to the document, go to the Properties window (see Figure 9-23).

efficient choice, so the automatic setting always works, but you gain performance if you specify the connection to be queued.

That e-mail must work this way will actually be quite obvious if you think for a moment about the Bcc blind carbon-copy header Unlike the To and Cc headers, which make it to the e-mail s destination and let each recipient see who else was sent that e-mail, the Bcc header names people who you want to receive the mail without any of the other recipients knowing Blind copies let you quietly bring a message to someone s attention without alerting the other readers of the e-mail The existence of a header like Bcc that can be present when you compose a message but disappear as it is sent raises two points: Your e-mail client edits your message s headers before sending it.

Let s go back to the TextThread and TextDevice classes from the beginning of the chapter. Instead of having the text thread call the text device to pass the text, a signal will be sent. The signal will go from the text thread to the text device receding in the main thread. The new TextThread class can be seen in Listing 12-26. The highlighted lines show the changes that have been made to add a signal and a stop method. In the earlier versions, the class depended on a global flag variable that indicated that the threads should halt execution; in this version, that flag, m_stop, is internal and is set using the stop method. To allow the signal, the Q_OBJECT macro has been added as well as a signals section and an actual signal, writeText, carrying a QString as argument. Listing 12-26. The TextThread with the writeText signal class TextThread : public QThread { Q_OBJECT public: TextThread( const QString& text ); void run(); void stop(); signals: void writeText( const QString& ); private: QString m_text; bool m_stop; }; The TextDevice class has been turned into a thread it now inherits QThread and has the same stop mechanism as the TextThread class. (The class declaration can be seen in Listing 12-27.) The highlighted lines show the Q_OBJECT macro, a public slots section, and the actual slot (write) that accepts a QString as argument. Listing 12-27. The TextDevice class declared as a thread class TextDevice : public QThread { Q_OBJECT

Besides removing the Bcc header so that none of the e-mail's recipients gets a copy of it, the client typically adds headers as well, such as a unique message ID, and perhaps the name of the e-mail client itself (an e-mail open on my desktop right now, for example, identifies the X-Mailer that sent it as YahooMailClassic ) An e-mail can pass across SMTP toward a destination address that is mentioned nowhere in the e-mail headers or text itself and can do this for the most legitimate of reasons..

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