QXmlDefaultHandler

QXmlDefaultHandler is a class in the Qt framework that provides a default implementation for the QXmlErrorHandler interface. It is used to handle errors that occur during XML parsing. When an XML parser encounters an error, it will call methods on an error handler object. QXmlDefaultHandler provides empty implementations for most of these methods, meaning it does not actively report errors by default.

To use QXmlDefaultHandler, you typically subclass it and reimplement the specific error handling methods you are interested in. These methods include error(), fatalError(), and warning(). By overriding these, you can define how your application should react to different types of XML parsing issues. For instance, you might log the error message, display a dialog to the user, or attempt to recover from non-fatal errors.

The primary purpose of QXmlDefaultHandler is to serve as a convenient base class. Instead of having to implement all the methods of QXmlErrorHandler from scratch, developers can inherit from QXmlDefaultHandler and only override the methods relevant to their error handling strategy. This simplifies the process of integrating XML parsing error reporting into Qt applications.