# QXmlSerializer Class Reference
## [[QtXmlPatterns](index.htm) module]
该QXmlSerializer类是一个实现[QAbstractXmlReceiver](qabstractxmlreceiver.html)转化[XQuery](index.htm)输出为未格式化的XML 。[More...](#details)
继承[QAbstractXmlReceiver](qabstractxmlreceiver.html)。
通过继承[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
该QXmlSerializer类是一个实现[QAbstractXmlReceiver](qabstractxmlreceiver.html)转化[XQuery](index.htm)输出为未格式化的XML 。
QXmlSerializer的翻译[XQuery sequence](qabstractxmlreceiver.html#xquery-sequence)，一个通常的输出[QXmlQuery](qxmlquery.html)，转换成XML 。考虑例子：
```
[QXmlQuery](qxmlquery.html) query;
query.setQuery("doc('index.html')/html/body/p[1]");
QXmlSerializer serializer(query, myOutputDevice);
query.evaluateTo(&serializer);
```
首先它构造一个[query](qxmlquery.html)这会从文档的第一段`index.html`。然后，它会构造这个类的一个实例与[query](qxmlquery.html)和[myOutputDevice](qiodevice.html)。最后，它[evaluates](qxmlquery.html#evaluateTo)该[query](qxmlquery.html)，产生呼叫到串行器的回调函数的有序序列。回调的序列转换查询输出到XML ，并将其写入到[myOutputDevice](qiodevice.html)。
QXmlSerializer将：
* 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.
如果序列化过程中发生错误，结果是不确定的，除非该串行器通过调用驱动[QXmlQuery.evaluateTo](qxmlquery.html#evaluateTo)（ ） 。
如果生成的XML应当缩进和格式化的阅读，使用[QXmlFormatter](qxmlformatter.html)。
* * *
## Method Documentation
```
QXmlSerializer.__init__ (self, QXmlQuery query, QIODevice outputDevice)
```
构造一个使用的名称游泳池和消息处理程序序列化_query_，并写入到输出_outputDevice_。
_outputDevice_必须是有效的，非空的设备处于写模式打开，否则行为是未定义的。
_outputDevice_不得开[QIODevice.Text](qiodevice.html#OpenModeFlag-enum)因为这将导致输出不正确。本课程将确保行结束被序列化为符合XML规范。[QXmlSerializer](qxmlserializer.html)不采取所有权_outputDevice_。
```
QXmlSerializer.atomicValue (self, QVariant value)
```
从重新实现[QAbstractXmlReceiver.atomicValue](qabstractxmlreceiver.html#atomicValue)（ ） 。
```
QXmlSerializer.attribute (self, QXmlName name, QStringRef value)
```
```
QXmlSerializer.characters (self, QStringRef value)
```
从重新实现[QAbstractXmlReceiver.characters](qabstractxmlreceiver.html#characters)（ ） 。
```
QTextCodec QXmlSerializer.codec (self)
```
[
返回正在使用的序列，它的XML输出编码的编解码器。
](qtextcodec.html)
[**See also**](qtextcodec.html) [setCodec](qxmlserializer.html#setCodec)（ ） 。
```
QXmlSerializer.comment (self, QString value)
```
从重新实现[QAbstractXmlReceiver.comment](qabstractxmlreceiver.html#comment)（ ） 。
```
QXmlSerializer.endDocument (self)
```
从重新实现[QAbstractXmlReceiver.endDocument](qabstractxmlreceiver.html#endDocument)（ ） 。
```
QXmlSerializer.endElement (self)
```
从重新实现[QAbstractXmlReceiver.endElement](qabstractxmlreceiver.html#endElement)（ ） 。
```
QXmlSerializer.endOfSequence (self)
```
从重新实现[QAbstractXmlReceiver.endOfSequence](qabstractxmlreceiver.html#endOfSequence)（ ） 。
```
QXmlSerializer.namespaceBinding (self, QXmlName nb)
```
从重新实现[QAbstractXmlReceiver.namespaceBinding](qabstractxmlreceiver.html#namespaceBinding)（ ） 。
```
QIODevice QXmlSerializer.outputDevice (self)
```
[
将指针返回到输出设备。没有相应的功能，以_set_输出设备，因为输出设备必须传递给构造函数。该串行器并不需要它的IO设备的所有权。
```
QXmlSerializer.processingInstruction (self, QXmlName name, QString value)
```
](qiodevice.html)
[从重新实现](qiodevice.html)[QAbstractXmlReceiver.processingInstruction](qabstractxmlreceiver.html#processingInstruction)（ ） 。
```
QXmlSerializer.setCodec (self, QTextCodec codec)
```
设置编解码器串行器将用于其XML输出编码。输出的编解码器被设置为_outputCodec_。默认情况下，输出的编解码器被设置为一个用于`UTF-8`。该串行器并不需要编解码器的所有权。
**See also** [codec](qxmlserializer.html#codec)（ ） 。
```
QXmlSerializer.startDocument (self)
```
从重新实现[QAbstractXmlReceiver.startDocument](qabstractxmlreceiver.html#startDocument)（ ） 。
```
QXmlSerializer.startElement (self, QXmlName name)
```
从重新实现[QAbstractXmlReceiver.startElement](qabstractxmlreceiver.html#startElement)（ ） 。
```
QXmlSerializer.startOfSequence (self)
```
从重新实现[QAbstractXmlReceiver.startOfSequence](qabstractxmlreceiver.html#startOfSequence)（ ） 。
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- 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