# QXmlNodeModelIndex Class Reference
## [[QtXmlPatterns](index.htm) module]
该QXmlNodeModelIndex类标识从子类中的XML节点模型的节点[QAbstractXmlNodeModel](qabstractxmlnodemodel.html)。[More...](#details)
### Types
* `enum DocumentOrder { Precedes, Is, Follows }`
* `enum NodeKind { Attribute, Comment, Document, Element, ..., Text }`
### Methods
* `__init__ (self)`
* `__init__ (self, QXmlNodeModelIndex other)`
* `int additionalData (self)`
* `int data (self)`
* `object internalPointer (self)`
* `bool isNull (self)`
* `QAbstractXmlNodeModel model (self)`
### Special Methods
* `bool __eq__ (self, QXmlNodeModelIndex other)`
* `int __hash__ (self)`
* `bool __ne__ (self, QXmlNodeModelIndex other)`
* * *
## Detailed Description
该QXmlNodeModelIndex类标识从子类中的XML节点模型的节点[QAbstractXmlNodeModel](qabstractxmlnodemodel.html)。
QXmlNodeModelIndex是一个索引到一个[XML node model](qabstractxmlnodemodel.html)。它包含:
* A pointer to an [XML node model](qabstractxmlnodemodel.html), which is returned by [model](qxmlnodemodelindex.html#model)(), and
* Some data, which is returned by [data](qxmlnodemodelindex.html#data)(), [internalPointer](qxmlnodemodelindex.html#internalPointer)(), and [additionalData](qxmlnodemodelindex.html#additionalData)().
因为QXmlNodeModelIndex是故意一个简单的类,它没有成员函数来访问节点的属性。例如,它不具有用于获取节点的名称或属性或子节点的列表的功能。如果你发现你需要找回这种从查询结果的信息,有两种方法来进行。
* Send the output of your [XQuery](index.htm) to an [XML receiver](qabstractxmlreceiver.html), or
* Let your [XQuery](index.htm) do all the work to produce the desired result.
第二个案例是通过例子来说明。假设你要填充列表控件与一组结果元素的某些属性的值。你可以写一个[XQuery](index.htm)返回元素集合,然后你会写遍历结果元素,得到他们的属性,并提取所需的字符串值的代码。但更简单的办法,那就是增加你的[XQuery](index.htm)寻找所需的属性值。然后,所有你所要做的就是评估[XQuery](index.htm)使用的版本[QXmlQuery.evaluateTo](qxmlquery.html#evaluateTo)()为填充[QStringList](qstringlist.html),您可以直接发送到您的Widget 。
QXmlNodeModelIndex不强加任何限制`data`看重的QXmlNodeModelIndex应包含的内容。数据的含义左到相关的[node model](qabstractxmlnodemodel.html)。因为QXmlNodeModelIndex依赖于特定的子类[QAbstractXmlNodeModel](qabstractxmlnodemodel.html)它的存在,你可以创建QXmlNodeModelIndex的一个实例的唯一方法是通过询问节点模型与为您创建一个[QAbstractXmlNodeModel.createIndex](qabstractxmlnodemodel.html#createIndex)( ) 。由于该功能是受保护的,它通常是一个好主意,写一个公共函数,从参数是适合您的特定节点的模型创建一个QXmlNodeModelIndex 。
一个默认的构造节点索引据说是空,即,[isNull](qxmlnodemodelindex.html#isNull)( )返回True 。
QXmlNodeModelIndex和[QAbstractXmlNodeModel](qabstractxmlnodemodel.html)遵循用于相同的设计图案[QModelIndex](qmodelindex.html)和[QAbstractItemModel](qabstractitemmodel.html)。
* * *
## Type Documentation
```
QXmlNodeModelIndex.DocumentOrder
```
标识特定的节点比较运算符,应使用。
| Constant | Value | Description |
| --- | --- | --- |
| `QXmlNodeModelIndex.Precedes` | `-1` | 标志着`\<\<`运营商。测试第一个操作数是否优先于第二个文件中。 |
| `QXmlNodeModelIndex.Follows` | `1` | 标志着`\>\>`运营商。测试第一个操作数是否遵循第二文档中。 |
| `QXmlNodeModelIndex.Is` | `0` | 标志着`is`运营商。测试两个节点是否有相同的节点标识。 |
```
QXmlNodeModelIndex.NodeKind
```
确定了一种节点。
| Constant | Value | Description |
| --- | --- | --- |
| `QXmlNodeModelIndex.Attribute` | `1` | 标识属性节点 |
| `QXmlNodeModelIndex.Text` | `64` | 识别文本节点 |
| `QXmlNodeModelIndex.Comment` | `2` | 标识一个注释节点 |
| `QXmlNodeModelIndex.Document` | `4` | 标识一个文档节点 |
| `QXmlNodeModelIndex.Element` | `8` | 标识一个元素节点 |
| `QXmlNodeModelIndex.Namespace` | `16` | 标识一个命名空间节点 |
| `QXmlNodeModelIndex.ProcessingInstruction` | `32` | 识别处理指令。 |
请注意,可选的XML声明的XML文档的最开始并不是一个处理指令
**See also** [QAbstractXmlNodeModel.kind](qabstractxmlnodemodel.html#kind)( ) 。
* * *
## Method Documentation
```
QXmlNodeModelIndex.__init__ (self)
```
默认构造函数。创建一个项目,是`null`。
**See also** [isNull](qxmlnodemodelindex.html#isNull)( ) 。
```
QXmlNodeModelIndex.__init__ (self, QXmlNodeModelIndex other)
```
标准的拷贝构造函数。创建[QXmlNodeModelIndex](qxmlnodemodelindex.html)例如,它是一个拷贝_other_。
```
int QXmlNodeModelIndex.additionalData (self)
```
返回第二数据值。该节点的索引保存两个数据值。[data](qxmlnodemodelindex.html#data)( )返回第一个。
**See also** [data](qxmlnodemodelindex.html#data)( ) 。
```
int QXmlNodeModelIndex.data (self)
```
返回第一个数据值。该节点的索引保存两个数据值。[additionalData](qxmlnodemodelindex.html#additionalData)( )返回第二个。
**See also** [additionalData](qxmlnodemodelindex.html#additionalData)( ) 。
```
object QXmlNodeModelIndex.internalPointer (self)
```
返回第一个数据值作为一个void *指针。
**See also** [additionalData](qxmlnodemodelindex.html#additionalData)( ) 。
```
bool QXmlNodeModelIndex.isNull (self)
```
返回True如果[QXmlNodeModelIndex](qxmlnodemodelindex.html)是一个默认的构造值,否则返回False 。
空[QXmlNodeModelIndex](qxmlnodemodelindex.html)不代表任何节点,并且可以与同时使用[QAbstractXmlNodeModel](qabstractxmlnodemodel.html)。
```
QAbstractXmlNodeModel QXmlNodeModelIndex.model (self)
```
[](qabstractxmlnodemodel.html)
[返回](qabstractxmlnodemodel.html)[QAbstractXmlNodeModel](qabstractxmlnodemodel.html)该节点的索引指。[QXmlNodeModelIndex](qxmlnodemodelindex.html)不拥有[QAbstractXmlNodeModel](qabstractxmlnodemodel.html)并没有保持其一生的轨迹,因此这个指针将吊着如果[QAbstractXmlNodeModel](qabstractxmlnodemodel.html)首先释放。
有实例的,因为没有setter的节点模型[QXmlNodeModelIndex](qxmlnodemodelindex.html)实例仅创建[QAbstractXmlNodeModel.createIndex](qabstractxmlnodemodel.html#createIndex)( ) 。
```
bool QXmlNodeModelIndex.__eq__ (self, QXmlNodeModelIndex other)
```
```
int QXmlNodeModelIndex.__hash__ (self)
```
```
bool QXmlNodeModelIndex.__ne__ (self, QXmlNodeModelIndex other)
```
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- 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