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QXmlSimpleReader reader; reader.setContentHandler( &handler ); reader.parse( source ); file.close(); return 0; } The declaration of the handler class MyHandler can be seen in Listing 8-17. The class inherits from QXmlDefaultHandler, which is derived from QXmlContentHandler. The benefit of inheriting QXmlDefaultHandler is that the default handler class provides dummy implementations of all the methods that you otherwise would have had to implement as stubs. The methods in the handler class get called by the reader when something is encountered. You want to handle text and tags and know when the parsing process starts and ends, so the methods shown in the class declaration have been implemented. All methods return a bool value, which is used to stop the parsing if an error is encountered. All methods must return true for the reader to continue reading. Listing 8-17. The MyHandler SAX handler class class MyHandler : public QXmlDefaultHandler { public: bool startDocument(); bool endDocument(); bool startElement( const QString &namespaceURI, const QString &localName, const QString &qName, const QXmlAttributes &atts ); bool endElement( const QString &namespaceURI, const QString &localName, const QString &qName ); bool characters( const QString &ch ); }; All methods except startElement look more or less like the method shown in Listing 8-18. A simple text is printed to the debug console, and then true is returned. In the case of endElement (shown in the listing), an argument is printed as well. Listing 8-18. A simple handling class method bool MyHandler::endElement( const QString &namespaceURI, const QString &localName, const QString &qName ) { qDebug() << "End of element" << qName; return true; }

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esting is the process of ensuring that the code you write performs in the way it was intended Testing encompasses many different aspects that are relevant to a Pylons application For example, it is important the libraries do what they are supposed to, that the controllers return the correct HTML pages for the actions they are performing, and that the application behaves in a way that the users find intuitive Here are some of the many reasons why writing effective tests is a very good idea when developing a Pylons application: Fast refactoring: Over the course of most software development projects you ll find that a lot of the code you wrote at the very start of the project is modified before the final release.

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Any string that is possibly derived from untrusted data and is inserted into an HTML document must be HTML-escaped using the HTML escape function introduced in Section 10.5.1.

This isn t necessarily because the code contains bugs; it could be because requirements have changed or because you ve spotted a better way of implementing the same functionality If you have already written tests for the code you need to refactor and the tests pass after you ve updated the code, then you can be confident that the changes you made are unlikely to have introduced any unexpected bugs Ensuring simple design: If writing unit tests for a particular set of classes, methods, or functions turns out to be a difficult process, it is likely that the code is too complicated and not adequately exposing the API that another developer interacting with your code might eventually need The fact you are able to write a unit test for a piece of code goes some way to ensuring it is correctly designed.

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racca3141/UPC: Build a UPC-A label. - GitHub
27 Apr 2018 ... UPCMain . java is a command line program that takes in a 12 digit number and checks to see if it is a valid UPC-A barcode. It does this by ...

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The startElement method, shown in Listing 8-19, is slightly more complex. First, the element s name is printed; then the list of attributes passed through an QXmlAttributes object is printed. The QXmlAttributes is not a standard container, so you must iterate through it using an index variable instead of just using the foreach macro. Before the method ends, you return true to tell the reader that everything is working as expected. Listing 8-19. The startElement method lists the attributes of the element. bool MyHandler::startElement( const QString &namespaceURI, const QString &localName, const QString &qName, const QXmlAttributes &atts ) { qDebug() << "Start of element" << qName; for( int i=0; i<atts.length(); ++i ) qDebug() << " " << atts.qName(i) << "=" << atts.value(i); return true; } The reason for printing the qName instead of the namespaceURI or localName is that the qName is the tag name that you expect. Namespaces and local names are beyond the scope of this book. It is not very complicated to build an XML parser by implementing a SAX handler. As soon as you want to convert the XML data into custom data for your application, you should consider using SAX. Because the entire document is not loaded at once, the memory requirements of the application are reduced, which might mean that your application runs more quickly.

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Barcode4J is a free and flexible Java library for Barcode generation. This requires the ... in classpath. The following example shows generating UPC-A Barcode.

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