# QXmlDefaultHandler Class Reference
## [[QtXml](index.htm) module]
该QXmlDefaultHandler类提供了所有的XML处理程序类的默认实现。[More...](#details)
继承[QXmlContentHandler](qxmlcontenthandler.html)，[QXmlErrorHandler](qxmlerrorhandler.html)，[QXmlDTDHandler](qxmldtdhandler.html)，[QXmlEntityResolver](qxmlentityresolver.html)，[QXmlLexicalHandler](qxmllexicalhandler.html)和[QXmlDeclHandler](qxmldeclhandler.html)。
### Methods
* `__init__ (self)`
* `bool attributeDecl (self, QString eName, QString aName, QString type, QString valueDefault, QString value)`
* `bool characters (self, QString ch)`
* `bool comment (self, QString ch)`
* `bool endCDATA (self)`
* `bool endDocument (self)`
* `bool endDTD (self)`
* `bool endElement (self, QString namespaceURI, QString localName, QString qName)`
* `bool endEntity (self, QString name)`
* `bool endPrefixMapping (self, QString prefix)`
* `bool error (self, QXmlParseException exception)`
* `QString errorString (self)`
* `bool externalEntityDecl (self, QString name, QString publicId, QString systemId)`
* `bool fatalError (self, QXmlParseException exception)`
* `bool ignorableWhitespace (self, QString ch)`
* `bool internalEntityDecl (self, QString name, QString value)`
* `bool notationDecl (self, QString name, QString publicId, QString systemId)`
* `bool processingInstruction (self, QString target, QString data)`
* `(bool, QXmlInputSource ret) resolveEntity (self, QString publicId, QString systemId)`
* `setDocumentLocator (self, QXmlLocator locator)`
* `bool skippedEntity (self, QString name)`
* `bool startCDATA (self)`
* `bool startDocument (self)`
* `bool startDTD (self, QString name, QString publicId, QString systemId)`
* `bool startElement (self, QString namespaceURI, QString localName, QString qName, QXmlAttributes atts)`
* `bool startEntity (self, QString name)`
* `bool startPrefixMapping (self, QString prefix, QString uri)`
* `bool unparsedEntityDecl (self, QString name, QString publicId, QString systemId, QString notationName)`
* `bool warning (self, QXmlParseException exception)`
* * *
## Detailed Description
该QXmlDefaultHandler类提供了所有的XML处理程序类的默认实现。
这个类聚拢专门的处理程序类的功能，实现自定义处理程序的子类时，使其成为一个方便的起点[QXmlReader](qxmlreader.html)，特别是[QXmlSimpleReader](qxmlsimplereader.html)。从每一个基类的虚函数重新实现这个类，对于很多常见情况提供合理的默认行为。通过继承这个类，并重写这些功能，你可以专注于实现应用程序相关的处理程序的各个部分。
XML读取器必须被告知在分析过程中使用的不同种类的事件的处理程序。这意味着，虽然QXmlDefaultHandler提供的所有基类继承的函数的默认实现，我们仍然可以使用专门的处理程序为特定类型的事件。
例如， QXmlDefaultHandler两个子类[QXmlContentHandler](qxmlcontenthandler.html)和[QXmlErrorHandler](qxmlerrorhandler.html)，所以通过继承它，我们可以使用相同的处理器为以下两个读卡器功能：
```
xmlReader.setContentHandler(handler);
xmlReader.setErrorHandler(handler);
```
由于阅读器将通知解析错误的处理程序中，有必要重新实现[QXmlErrorHandler.fatalError](qxmlerrorhandler.html#fatalError)（ ）如果，例如，我们想停止这样的时候发生错误解析：
```
bool Handler.fatalError (const [QXmlParseException](qxmlparseexception.html) & exception)
{
qWarning() << "Fatal error on line" << exception.lineNumber()
<< ", column" << exception.columnNumber() << ":"
<< exception.message();
return false;
}
```
上面的函数返回False ，它告诉读者停止解析。继续使用相同的阅读器，就必须建立新的处理程序实例，并且设置了阅读器把它用在上面描述的方式。
重要的是要研究一些继承QXmlDefaultHandler的功能，并考虑他们为什么会在自定义处理程序来重新实现是非常有用的。自定义处理程序通常会重新实现[QXmlContentHandler.startDocument](qxmlcontenthandler.html#startDocument)（ ）准备处理程序的新内容。文档中的元素和其中的文本可以通过重新实现处理[QXmlContentHandler.startElement](qxmlcontenthandler.html#startElement)（ ）[QXmlContentHandler.endElement](qxmlcontenthandler.html#endElement)（）和[QXmlContentHandler.characters](qxmlcontenthandler.html#characters)（ ） 。您可能需要重新实现[QXmlContentHandler.endDocument](qxmlcontenthandler.html#endDocument)（）来对内容进行一些最后确定或验证，一旦该文件已被完全读取。
* * *
## Method Documentation
```
QXmlDefaultHandler.__init__ (self)
```
构造一个处理程序与子类使用[QXmlReader](qxmlreader.html)。
```
bool QXmlDefaultHandler.attributeDecl (self, QString eName, QString aName, QString type, QString valueDefault, QString value)
```
从重新实现[QXmlDeclHandler.attributeDecl](qxmldeclhandler.html#attributeDecl)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.characters (self, QString ch)
```
从重新实现[QXmlContentHandler.characters](qxmlcontenthandler.html#characters)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.comment (self, QString ch)
```
从重新实现[QXmlLexicalHandler.comment](qxmllexicalhandler.html#comment)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.endCDATA (self)
```
从重新实现[QXmlLexicalHandler.endCDATA](qxmllexicalhandler.html#endCDATA)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.endDocument (self)
```
从重新实现[QXmlContentHandler.endDocument](qxmlcontenthandler.html#endDocument)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.endDTD (self)
```
从重新实现[QXmlLexicalHandler.endDTD](qxmllexicalhandler.html#endDTD)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.endElement (self, QString namespaceURI, QString localName, QString qName)
```
从重新实现[QXmlContentHandler.endElement](qxmlcontenthandler.html#endElement)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.endEntity (self, QString name)
```
从重新实现[QXmlLexicalHandler.endEntity](qxmllexicalhandler.html#endEntity)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.endPrefixMapping (self, QString prefix)
```
从重新实现[QXmlContentHandler.endPrefixMapping](qxmlcontenthandler.html#endPrefixMapping)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.error (self, QXmlParseException exception)
```
从重新实现[QXmlErrorHandler.error](qxmlerrorhandler.html#error)（ ） 。
这个重新实现不执行任何操作。
```
QString QXmlDefaultHandler.errorString (self)
```
从重新实现[QXmlContentHandler.errorString](qxmlcontenthandler.html#errorString)（ ） 。
返回默认的错误字符串。
```
bool QXmlDefaultHandler.externalEntityDecl (self, QString name, QString publicId, QString systemId)
```
从重新实现[QXmlDeclHandler.externalEntityDecl](qxmldeclhandler.html#externalEntityDecl)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.fatalError (self, QXmlParseException exception)
```
从重新实现[QXmlErrorHandler.fatalError](qxmlerrorhandler.html#fatalError)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.ignorableWhitespace (self, QString ch)
```
从重新实现[QXmlContentHandler.ignorableWhitespace](qxmlcontenthandler.html#ignorableWhitespace)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.internalEntityDecl (self, QString name, QString value)
```
从重新实现[QXmlDeclHandler.internalEntityDecl](qxmldeclhandler.html#internalEntityDecl)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.notationDecl (self, QString name, QString publicId, QString systemId)
```
从重新实现[QXmlDTDHandler.notationDecl](qxmldtdhandler.html#notationDecl)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.processingInstruction (self, QString target, QString data)
```
从重新实现[QXmlContentHandler.processingInstruction](qxmlcontenthandler.html#processingInstruction)（ ） 。
这个重新实现不执行任何操作。
```
(bool, QXmlInputSource ret) QXmlDefaultHandler.resolveEntity (self, QString publicId, QString systemId)
```
从重新实现[QXmlEntityResolver.resolveEntity](qxmlentityresolver.html#resolveEntity)（ ） 。
Sets _ret_为0，从而使读取器使用的XML文件中提供的系统标识符。
```
QXmlDefaultHandler.setDocumentLocator (self, QXmlLocator locator)
```
从重新实现[QXmlContentHandler.setDocumentLocator](qxmlcontenthandler.html#setDocumentLocator)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.skippedEntity (self, QString name)
```
从重新实现[QXmlContentHandler.skippedEntity](qxmlcontenthandler.html#skippedEntity)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.startCDATA (self)
```
从重新实现[QXmlLexicalHandler.startCDATA](qxmllexicalhandler.html#startCDATA)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.startDocument (self)
```
从重新实现[QXmlContentHandler.startDocument](qxmlcontenthandler.html#startDocument)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.startDTD (self, QString name, QString publicId, QString systemId)
```
从重新实现[QXmlLexicalHandler.startDTD](qxmllexicalhandler.html#startDTD)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.startElement (self, QString namespaceURI, QString localName, QString qName, QXmlAttributes atts)
```
从重新实现[QXmlContentHandler.startElement](qxmlcontenthandler.html#startElement)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.startEntity (self, QString name)
```
从重新实现[QXmlLexicalHandler.startEntity](qxmllexicalhandler.html#startEntity)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.startPrefixMapping (self, QString prefix, QString uri)
```
从重新实现[QXmlContentHandler.startPrefixMapping](qxmlcontenthandler.html#startPrefixMapping)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.unparsedEntityDecl (self, QString name, QString publicId, QString systemId, QString notationName)
```
从重新实现[QXmlDTDHandler.unparsedEntityDecl](qxmldtdhandler.html#unparsedEntityDecl)（ ） 。
这个重新实现不执行任何操作。
```
bool QXmlDefaultHandler.warning (self, QXmlParseException exception)
```
从重新实现[QXmlErrorHandler.warning](qxmlerrorhandler.html#warning)（ ） 。
这个重新实现不执行任何操作。
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- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference