# QXmlDefaultHandler Class Reference
## [[QtXml](index.htm) module]
該QXmlDefaultHandler類提供了所有的XML處理程序類的默認實現。[More...](#details)
繼承[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
該QXmlDefaultHandler類提供了所有的XML處理程序類的默認實現。
這個類聚攏專門的處理程序類的功能,實現自定義處理程序的子類時,使其成為一個方便的起點[QXmlReader](qxmlreader.html),特別是[QXmlSimpleReader](qxmlsimplereader.html)。從每一個基類的虛函數重新實現這個類,對于很多常見情況提供合理的默認行為。通過繼承這個類,并重寫這些功能,你可以專注于實現應用程序相關的處理程序的各個部分。
XML讀取器必須被告知在分析過程中使用的不同種類的事件的處理程序。這意味著,雖然QXmlDefaultHandler提供的所有基類繼承的函數的默認實現,我們仍然可以使用專門的處理程序為特定類型的事件。
例如, QXmlDefaultHandler兩個子類[QXmlContentHandler](qxmlcontenthandler.html)和[QXmlErrorHandler](qxmlerrorhandler.html),所以通過繼承它,我們可以使用相同的處理器為以下兩個讀卡器功能:
```
xmlReader.setContentHandler(handler);
xmlReader.setErrorHandler(handler);
```
由于閱讀器將通知解析錯誤的處理程序中,有必要重新實現[QXmlErrorHandler.fatalError](qxmlerrorhandler.html#fatalError)( )如果,例如,我們想停止這樣的時候發生錯誤解析:
```
bool Handler.fatalError (const [QXmlParseException](qxmlparseexception.html) & exception)
{
qWarning() << "Fatal error on line" << exception.lineNumber()
<< ", column" << exception.columnNumber() << ":"
<< exception.message();
return false;
}
```
上面的函數返回False ,它告訴讀者停止解析。繼續使用相同的閱讀器,就必須建立新的處理程序實例,并且設置了閱讀器把它用在上面描述的方式。
重要的是要研究一些繼承QXmlDefaultHandler的功能,并考慮他們為什么會在自定義處理程序來重新實現是非常有用的。自定義處理程序通常會重新實現[QXmlContentHandler.startDocument](qxmlcontenthandler.html#startDocument)( )準備處理程序的新內容。文檔中的元素和其中的文本可以通過重新實現處理[QXmlContentHandler.startElement](qxmlcontenthandler.html#startElement)( )[QXmlContentHandler.endElement](qxmlcontenthandler.html#endElement)()和[QXmlContentHandler.characters](qxmlcontenthandler.html#characters)( ) 。您可能需要重新實現[QXmlContentHandler.endDocument](qxmlcontenthandler.html#endDocument)()來對內容進行一些最后確定或驗證,一旦該文件已被完全讀取。
* * *
## Method Documentation
```
QXmlDefaultHandler.__init__ (self)
```
構造一個處理程序與子類使用[QXmlReader](qxmlreader.html)。
```
bool QXmlDefaultHandler.attributeDecl (self, QString?eName, QString?aName, QString?type, QString?valueDefault, QString?value)
```
從重新實現[QXmlDeclHandler.attributeDecl](qxmldeclhandler.html#attributeDecl)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.characters (self, QString?ch)
```
從重新實現[QXmlContentHandler.characters](qxmlcontenthandler.html#characters)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.comment (self, QString?ch)
```
從重新實現[QXmlLexicalHandler.comment](qxmllexicalhandler.html#comment)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.endCDATA (self)
```
從重新實現[QXmlLexicalHandler.endCDATA](qxmllexicalhandler.html#endCDATA)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.endDocument (self)
```
從重新實現[QXmlContentHandler.endDocument](qxmlcontenthandler.html#endDocument)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.endDTD (self)
```
從重新實現[QXmlLexicalHandler.endDTD](qxmllexicalhandler.html#endDTD)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.endElement (self, QString?namespaceURI, QString?localName, QString?qName)
```
從重新實現[QXmlContentHandler.endElement](qxmlcontenthandler.html#endElement)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.endEntity (self, QString?name)
```
從重新實現[QXmlLexicalHandler.endEntity](qxmllexicalhandler.html#endEntity)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.endPrefixMapping (self, QString?prefix)
```
從重新實現[QXmlContentHandler.endPrefixMapping](qxmlcontenthandler.html#endPrefixMapping)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.error (self, QXmlParseException?exception)
```
從重新實現[QXmlErrorHandler.error](qxmlerrorhandler.html#error)( ) 。
這個重新實現不執行任何操作。
```
QString QXmlDefaultHandler.errorString (self)
```
從重新實現[QXmlContentHandler.errorString](qxmlcontenthandler.html#errorString)( ) 。
返回默認的錯誤字符串。
```
bool QXmlDefaultHandler.externalEntityDecl (self, QString?name, QString?publicId, QString?systemId)
```
從重新實現[QXmlDeclHandler.externalEntityDecl](qxmldeclhandler.html#externalEntityDecl)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.fatalError (self, QXmlParseException?exception)
```
從重新實現[QXmlErrorHandler.fatalError](qxmlerrorhandler.html#fatalError)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.ignorableWhitespace (self, QString?ch)
```
從重新實現[QXmlContentHandler.ignorableWhitespace](qxmlcontenthandler.html#ignorableWhitespace)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.internalEntityDecl (self, QString?name, QString?value)
```
從重新實現[QXmlDeclHandler.internalEntityDecl](qxmldeclhandler.html#internalEntityDecl)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.notationDecl (self, QString?name, QString?publicId, QString?systemId)
```
從重新實現[QXmlDTDHandler.notationDecl](qxmldtdhandler.html#notationDecl)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.processingInstruction (self, QString?target, QString?data)
```
從重新實現[QXmlContentHandler.processingInstruction](qxmlcontenthandler.html#processingInstruction)( ) 。
這個重新實現不執行任何操作。
```
(bool, QXmlInputSource?ret) QXmlDefaultHandler.resolveEntity (self, QString?publicId, QString?systemId)
```
從重新實現[QXmlEntityResolver.resolveEntity](qxmlentityresolver.html#resolveEntity)( ) 。
Sets _ret_為0,從而使讀取器使用的XML文件中提供的系統標識符。
```
QXmlDefaultHandler.setDocumentLocator (self, QXmlLocator?locator)
```
從重新實現[QXmlContentHandler.setDocumentLocator](qxmlcontenthandler.html#setDocumentLocator)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.skippedEntity (self, QString?name)
```
從重新實現[QXmlContentHandler.skippedEntity](qxmlcontenthandler.html#skippedEntity)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.startCDATA (self)
```
從重新實現[QXmlLexicalHandler.startCDATA](qxmllexicalhandler.html#startCDATA)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.startDocument (self)
```
從重新實現[QXmlContentHandler.startDocument](qxmlcontenthandler.html#startDocument)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.startDTD (self, QString?name, QString?publicId, QString?systemId)
```
從重新實現[QXmlLexicalHandler.startDTD](qxmllexicalhandler.html#startDTD)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.startElement (self, QString?namespaceURI, QString?localName, QString?qName, QXmlAttributes?atts)
```
從重新實現[QXmlContentHandler.startElement](qxmlcontenthandler.html#startElement)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.startEntity (self, QString?name)
```
從重新實現[QXmlLexicalHandler.startEntity](qxmllexicalhandler.html#startEntity)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.startPrefixMapping (self, QString?prefix, QString?uri)
```
從重新實現[QXmlContentHandler.startPrefixMapping](qxmlcontenthandler.html#startPrefixMapping)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.unparsedEntityDecl (self, QString?name, QString?publicId, QString?systemId, QString?notationName)
```
從重新實現[QXmlDTDHandler.unparsedEntityDecl](qxmldtdhandler.html#unparsedEntityDecl)( ) 。
這個重新實現不執行任何操作。
```
bool QXmlDefaultHandler.warning (self, QXmlParseException?exception)
```
從重新實現[QXmlErrorHandler.warning](qxmlerrorhandler.html#warning)( ) 。
這個重新實現不執行任何操作。
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- QSqlError Class Reference
- QSqlField Class Reference
- QSqlIndex Class Reference
- QSqlQuery Class Reference
- QSqlQueryModel Class Reference
- QSqlRecord Class Reference
- QSqlRelation Class Reference
- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
- QSqlResult Class Reference
- QSqlTableModel Class Reference
- Qt4.7文檔翻譯:Qt樣式單參考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
- QSslKey Class Reference
- QSslSocket Class Reference
- 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