# QXmlSerializer Class Reference
## [[QtXmlPatterns](index.htm) module]
該QXmlSerializer類是一個實現[QAbstractXmlReceiver](qabstractxmlreceiver.html)轉化[XQuery](index.htm)輸出為未格式化的XML 。[More...](#details)
繼承[QAbstractXmlReceiver](qabstractxmlreceiver.html)。
通過繼承[QXmlFormatter](qxmlformatter.html)。
### Methods
* `__init__ (self, QXmlQuery?query, QIODevice?outputDevice)`
* `atomicValue (self, QVariant?value)`
* `attribute (self, QXmlName?name, QStringRef?value)`
* `characters (self, QStringRef?value)`
* `QTextCodec codec (self)`
* `comment (self, QString?value)`
* `endDocument (self)`
* `endElement (self)`
* `endOfSequence (self)`
* `namespaceBinding (self, QXmlName?nb)`
* `QIODevice outputDevice (self)`
* `processingInstruction (self, QXmlName?name, QString?value)`
* `setCodec (self, QTextCodec?codec)`
* `startDocument (self)`
* `startElement (self, QXmlName?name)`
* `startOfSequence (self)`
* * *
## Detailed Description
該QXmlSerializer類是一個實現[QAbstractXmlReceiver](qabstractxmlreceiver.html)轉化[XQuery](index.htm)輸出為未格式化的XML 。
QXmlSerializer的翻譯[XQuery sequence](qabstractxmlreceiver.html#xquery-sequence)，一個通常的輸出[QXmlQuery](qxmlquery.html)，轉換成XML 。考慮例子：
```
[QXmlQuery](qxmlquery.html) query;
query.setQuery("doc('index.html')/html/body/p[1]");
QXmlSerializer serializer(query, myOutputDevice);
query.evaluateTo(&serializer);
```
首先它構造一個[query](qxmlquery.html)這會從文檔的第一段`index.html`。然后，它會構造這個類的一個實例與[query](qxmlquery.html)和[myOutputDevice](qiodevice.html)。最后，它[evaluates](qxmlquery.html#evaluateTo)該[query](qxmlquery.html)，產生呼叫到串行器的回調函數的有序序列。回調的序列轉換查詢輸出到XML ，并將其寫入到[myOutputDevice](qiodevice.html)。
QXmlSerializer將：
* Declare namespaces when needed,
* Use appropriate escaping, when characters can't be represented in the XML,
* Handle line endings appropriately,
* Report errors, when it can't serialize the content, e.g., when asked to serialize an attribute that is a top-level node, or when more than one top-level element is encountered.
如果序列化過程中發生錯誤，結果是不確定的，除非該串行器通過調用驅動[QXmlQuery.evaluateTo](qxmlquery.html#evaluateTo)（ ） 。
如果生成的XML應當縮進和格式化的閱讀，使用[QXmlFormatter](qxmlformatter.html)。
* * *
## Method Documentation
```
QXmlSerializer.__init__ (self, QXmlQuery?query, QIODevice?outputDevice)
```
構造一個使用的名稱游泳池和消息處理程序序列化_query_，并寫入到輸出_outputDevice_。
_outputDevice_必須是有效的，非空的設備處于寫模式打開，否則行為是未定義的。
_outputDevice_不得開[QIODevice.Text](qiodevice.html#OpenModeFlag-enum)因為這將導致輸出不正確。本課程將確保行結束被序列化為符合XML規范。[QXmlSerializer](qxmlserializer.html)不采取所有權_outputDevice_。
```
QXmlSerializer.atomicValue (self, QVariant?value)
```
從重新實現[QAbstractXmlReceiver.atomicValue](qabstractxmlreceiver.html#atomicValue)（ ） 。
```
QXmlSerializer.attribute (self, QXmlName?name, QStringRef?value)
```
```
QXmlSerializer.characters (self, QStringRef?value)
```
從重新實現[QAbstractXmlReceiver.characters](qabstractxmlreceiver.html#characters)（ ） 。
```
QTextCodec QXmlSerializer.codec (self)
```
[
返回正在使用的序列，它的XML輸出編碼的編解碼器。
](qtextcodec.html)
[**See also**](qtextcodec.html) [setCodec](qxmlserializer.html#setCodec)（ ） 。
```
QXmlSerializer.comment (self, QString?value)
```
從重新實現[QAbstractXmlReceiver.comment](qabstractxmlreceiver.html#comment)（ ） 。
```
QXmlSerializer.endDocument (self)
```
從重新實現[QAbstractXmlReceiver.endDocument](qabstractxmlreceiver.html#endDocument)（ ） 。
```
QXmlSerializer.endElement (self)
```
從重新實現[QAbstractXmlReceiver.endElement](qabstractxmlreceiver.html#endElement)（ ） 。
```
QXmlSerializer.endOfSequence (self)
```
從重新實現[QAbstractXmlReceiver.endOfSequence](qabstractxmlreceiver.html#endOfSequence)（ ） 。
```
QXmlSerializer.namespaceBinding (self, QXmlName?nb)
```
從重新實現[QAbstractXmlReceiver.namespaceBinding](qabstractxmlreceiver.html#namespaceBinding)（ ） 。
```
QIODevice QXmlSerializer.outputDevice (self)
```
[
將指針返回到輸出設備。沒有相應的功能，以_set_輸出設備，因為輸出設備必須傳遞給構造函數。該串行器并不需要它的IO設備的所有權。
```
QXmlSerializer.processingInstruction (self, QXmlName?name, QString?value)
```
](qiodevice.html)
[從重新實現](qiodevice.html)[QAbstractXmlReceiver.processingInstruction](qabstractxmlreceiver.html#processingInstruction)（ ） 。
```
QXmlSerializer.setCodec (self, QTextCodec?codec)
```
設置編解碼器串行器將用于其XML輸出編碼。輸出的編解碼器被設置為_outputCodec_。默認情況下，輸出的編解碼器被設置為一個用于`UTF-8`。該串行器并不需要編解碼器的所有權。
**See also** [codec](qxmlserializer.html#codec)（ ） 。
```
QXmlSerializer.startDocument (self)
```
從重新實現[QAbstractXmlReceiver.startDocument](qabstractxmlreceiver.html#startDocument)（ ） 。
```
QXmlSerializer.startElement (self, QXmlName?name)
```
從重新實現[QAbstractXmlReceiver.startElement](qabstractxmlreceiver.html#startElement)（ ） 。
```
QXmlSerializer.startOfSequence (self)
```
從重新實現[QAbstractXmlReceiver.startOfSequence](qabstractxmlreceiver.html#startOfSequence)（ ） 。
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- 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