# QXmlInputSource Class Reference
## [[QtXml](index.htm) module]
該QXmlInputSource類提供??輸入數據為[QXmlReader](qxmlreader.html)子類。[More...](#details)
### Methods
* `__init__ (self)`
* `__init__ (self, QIODevice?dev)`
* `__init__ (self, QXmlInputSource)`
* `QString data (self)`
* `fetchData (self)`
* `QString fromRawData (self, QByteArray?data, bool?beginning?=?False)`
* `QChar next (self)`
* `reset (self)`
* `setData (self, QString?dat)`
* `setData (self, QByteArray?dat)`
### Static Members
* `int **[EndOfData](qxmlinputsource.html#EndOfData-var)**`
* `int **[EndOfDocument](qxmlinputsource.html#EndOfDocument-var)**`
* * *
## Detailed Description
該QXmlInputSource類提供??輸入數據為[QXmlReader](qxmlreader.html)子類。
的所有子類[QXmlReader](qxmlreader.html)閱讀從這個類的輸入XML文檔。
這個類識別數據通過讀取編碼聲明在XML文件中的編碼，如果找到一個，并使用相應的編碼讀出的數據。如果它沒有找到一個編碼聲明，那么它假定數據是用UTF -8或UTF-16 ，這取決于它是否能找到一個字節順序標記。
有兩種方法來填充數據輸入源：你可以用它構建[QIODevice](qiodevice.html)*使輸入源讀取該設備的數據。或者您也可以顯式設置數據與之一[setData](qxmlinputsource.html#setData)（）函數。
通常你要么建立在這一個工作QXmlInputSource[QIODevice](qiodevice.html)*或者你構造一個空QXmlInputSource和設置數據[setData](qxmlinputsource.html#setData)（ ） 。目前只有極少數情況下，您都需要混合這兩種方法。
該[QXmlReader](qxmlreader.html)子類使用[next](qxmlinputsource.html#next)（ ）函數按字符讀取輸入的字符。如果你想從頭開始，使用[reset](qxmlinputsource.html#reset)（ ） 。
該功能[data](qxmlinputsource.html#data)（）和[fetchData](qxmlinputsource.html#fetchData)如果你想做一件事，比解析，如其他數據（ ）是有用的顯示原始XML文件。使用QXmlInputClass在這種情況下的好處是，它會嘗試使用正確的編碼。
* * *
## Method Documentation
```
QXmlInputSource.__init__ (self)
```
構造一個其中不包含任何數據的輸入源。
**See also** [setData](qxmlinputsource.html#setData)（ ） 。
```
QXmlInputSource.__init__ (self, QIODevice?dev)
```
構造一個輸入源，并從設備獲取數據_dev_。如果_dev_是不是開放的，它在只讀模式打開。如果_dev_是0或不可能從設備讀取，輸入信號源將不包含任何數據。
**See also** [setData](qxmlinputsource.html#setData)（ ）[fetchData](qxmlinputsource.html#fetchData)（）和[QIODevice](qiodevice.html)。
```
QXmlInputSource.__init__ (self, QXmlInputSource)
```
```
QString QXmlInputSource.data (self)
```
返回輸入源中包含的數據或空字符串，如果輸入信號源不包含任何數據。
**See also** [setData](qxmlinputsource.html#setData)（ ）[QXmlInputSource](qxmlinputsource.html#QXmlInputSource)（）和[fetchData](qxmlinputsource.html#fetchData)（ ） 。
```
QXmlInputSource.fetchData (self)
```
該函數讀取從施工過程中設置的設備更多的數據。如果輸入源已經包含數據，這個功能會刪除該數據首次。
這個對象包含調用此函數后沒有數據，如果該對象沒有一個設備讀取數據，或者如果這個功能是無法從設備得到更多的數據構成。
有兩次，其中一個是隱含另一個函數調用來完成取：施工期間（使物體開始與一些初始數據如果有的話） ，以及在通話期間[next](qxmlinputsource.html#next)（ ） （如果數據已經用完） 。
你通常不需要，如果你用它來使用這個功能[next](qxmlinputsource.html#next)（ ） 。
**See also** [data](qxmlinputsource.html#data)（ ）[next](qxmlinputsource.html#next)（）和[QXmlInputSource](qxmlinputsource.html#QXmlInputSource)（ ） 。
```
QString QXmlInputSource.fromRawData (self, QByteArray?data, bool?beginning?=?False)
```
該函數讀取XML文件_data_并試圖識別的編碼。它把原始數據_data_成[QString](qstring.html)并返回它。它試圖盡力獲取XML文件的正確編碼。
If _beginning_誠然，這個函數假設數據開始于一個新的XML文檔的開始，并尋找一個編碼聲明。如果_beginning_是假的，它使用從調用之前確定的編碼轉換的原始數據。
```
QChar QXmlInputSource.next (self)
```
返回輸入源的下一個字符。如果這個函數達到可用數據的末尾時，它返回[QXmlInputSource.EndOfData](qxmlinputsource.html#EndOfData-var)。如果你的next（）之后調用，它會嘗試通過調用來獲取更多數據[fetchData](qxmlinputsource.html#fetchData)（ ） 。如果[fetchData](qxmlinputsource.html#fetchData)（ ）調用會導致新的數據，這個函數返回數據的第一個字符，否則返回[QXmlInputSource.EndOfDocument](qxmlinputsource.html#EndOfDocument-var)。
讀者如[QXmlSimpleReader](qxmlsimplereader.html)，將假設XML文檔的結尾已經達到，如果這個函數返回[QXmlInputSource.EndOfDocument](qxmlinputsource.html#EndOfDocument-var)，并且將檢查所提供的輸入是良好的。因此，重新實現這個函數的時候，一定要確保這種行為是重復是很重要的。
**See also** [reset](qxmlinputsource.html#reset)（ ）[fetchData](qxmlinputsource.html#fetchData)（ ）[QXmlSimpleReader.parse](qxmlsimplereader.html#parse)（）和[QXmlSimpleReader.parseContinue](qxmlsimplereader.html#parseContinue)（ ） 。
```
QXmlInputSource.reset (self)
```
這個函數設置使用的位置[next](qxmlinputsource.html#next)（）來返回的數據的開頭[data](qxmlinputsource.html#data)（ ） 。如果你想使用的輸入源不止一個解析，這是很有用的。
**Note:**在該情況下，底層的數據源是一個[QIODevice](qiodevice.html)在設備的當前位置是不會自動設置為輸入的開始。該設備做這個呼吁QIODevice.seek （ 0 ） 。
**See also** [next](qxmlinputsource.html#next)（ ） 。
```
QXmlInputSource.setData (self, QString?dat)
```
輸入源的數據集，以_dat_。
如果輸入源已經包含數據，這個功能會刪除該數據首次。
**See also** [data](qxmlinputsource.html#data)（ ） 。
```
QXmlInputSource.setData (self, QByteArray?dat)
```
這是一個重載函數。
數據_dat_通過正確的文本編解碼器通過了，它被設置之前。
* * *
## Member Documentation
```
int EndOfData
```
此構件應被視為常數。
```
int EndOfDocument
```
此構件應被視為常數。
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- 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