# QDomDocument Class Reference
## [[QtXml](index.htm) module]
该QDomDocument类表示XML文档。[More...](#details)
继承[QDomNode](qdomnode.html)。
### Methods
* `__init__ (self)`
* `__init__ (self, QString name)`
* `__init__ (self, QDomDocumentType doctype)`
* `__init__ (self, QDomDocument x)`
* `QDomAttr createAttribute (self, QString name)`
* `QDomAttr createAttributeNS (self, QString nsURI, QString qName)`
* `QDomCDATASection createCDATASection (self, QString data)`
* `QDomComment createComment (self, QString data)`
* `QDomDocumentFragment createDocumentFragment (self)`
* `QDomElement createElement (self, QString tagName)`
* `QDomElement createElementNS (self, QString nsURI, QString qName)`
* `QDomEntityReference createEntityReference (self, QString name)`
* `QDomProcessingInstruction createProcessingInstruction (self, QString target, QString data)`
* `QDomText createTextNode (self, QString data)`
* `QDomDocumentType doctype (self)`
* `QDomElement documentElement (self)`
* `QDomElement elementById (self, QString elementId)`
* `QDomNodeList elementsByTagName (self, QString tagname)`
* `QDomNodeList elementsByTagNameNS (self, QString nsURI, QString localName)`
* `QDomImplementation implementation (self)`
* `QDomNode importNode (self, QDomNode importedNode, bool deep)`
* `QDomNode.NodeType nodeType (self)`
* `(bool, QString errorMsg, int errorLine, int errorColumn) setContent (self, QByteArray data, bool namespaceProcessing)`
* `(bool, QString errorMsg, int errorLine, int errorColumn) setContent (self, QString text, bool namespaceProcessing)`
* `(bool, QString errorMsg, int errorLine, int errorColumn) setContent (self, QIODevice dev, bool namespaceProcessing)`
* `(bool, QString errorMsg, int errorLine, int errorColumn) setContent (self, QXmlInputSource source, bool namespaceProcessing)`
* `(bool, QString errorMsg, int errorLine, int errorColumn) setContent (self, QByteArray buffer)`
* `(bool, QString errorMsg, int errorLine, int errorColumn) setContent (self, QString text)`
* `(bool, QString errorMsg, int errorLine, int errorColumn) setContent (self, QIODevice dev)`
* `(bool, QString errorMsg, int errorLine, int errorColumn) setContent (self, QXmlInputSource source, QXmlReader reader)`
* `QByteArray toByteArray (self, int indent = 1)`
* `QString toString (self, int indent = 1)`
* * *
## Detailed Description
该QDomDocument类表示XML文档。
该QDomDocument类代表整个XML文档。从概念上讲,它是文档树的根,并提供主要访问到文档的数据。
由于元素,文本节点,注释,处理指令等,不能在文档的上下文之外存在,文件类还包含创建这些对象所需的工厂函数。创建节点对象有一个[ownerDocument](qdomnode.html#ownerDocument)( )函数并将它们与在文档的背景下,他们创建的。将使用DOM类最经常是[QDomNode](qdomnode.html), QDomDocument ,[QDomElement](qdomelement.html)和[QDomText](qdomtext.html)。
解析后的XML是由可以使用各种QDom类访问对象树内部表示。只有所有QDom类_reference_在内部树的对象。一旦引用他们和QDomDocument本身最后QDom对象被删除在DOM树中的内部对象会被删除。
完成创作元素,文本节点等的使用在这个类中提供的各种工厂的功能。使用QDom类的默认构造函数只会造成无法操纵或插入到文档中的空对象。
该QDomDocument类有多种功能,用于创建文件的数据,例如,[createElement](qdomdocument.html#createElement)( )[createTextNode](qdomdocument.html#createTextNode)( )[createComment](qdomdocument.html#createComment)( )[createCDATASection](qdomdocument.html#createCDATASection)( )[createProcessingInstruction](qdomdocument.html#createProcessingInstruction)( )[createAttribute](qdomdocument.html#createAttribute)()和[createEntityReference](qdomdocument.html#createEntityReference)( ) 。其中的一些功能有支持命名空间的版本,即[createElementNS](qdomdocument.html#createElementNS)()和[createAttributeNS](qdomdocument.html#createAttributeNS)( ) 。该[createDocumentFragment](qdomdocument.html#createDocumentFragment)()函数是用于保存文件的部分,这是用于操作复杂的文件是有用的。
该文件的整个内容设置与[setContent](qdomdocument.html#setContent)( ) 。这个函数解析它通过为XML文档的字符串,并创建DOM树,代表该文件。使用根元素可用[documentElement](qdomdocument.html#documentElement)( ) 。可使用获得的文件的文字表述[toString](qdomdocument.html#toString)( ) 。
**Note:**DOM树可能最终保留了大量的内存,如果XML文档是很大的。对于大的XML文档,[QXmlStreamReader](qxmlstreamreader.html)或[QXmlQuery](qxmlquery.html)类可能是更好的解决方案。
它可以使用插入来自另一个文档中的节点插入到文档中[importNode](qdomdocument.html#importNode)( ) 。
可以得到所有具有带有特定标记的元素的列表[elementsByTagName](qdomdocument.html#elementsByTagName)()或与[elementsByTagNameNS](qdomdocument.html#elementsByTagNameNS)( ) 。
该QDom类通常使用如下:
```
QDomDocument doc("mydocument");
[QFile](qfile.html) file("mydocument.xml");
if (!file.open([QIODevice](qiodevice.html).ReadOnly))
return;
if (!doc.setContent(&file)) {
file.close();
return;
}
file.close();
// print out the element names of all elements that are direct children
// of the outermost element.
[QDomElement](qdomelement.html) docElem = doc.documentElement();
[QDomNode](qdomnode.html) n = docElem.firstChild();
while(!n.isNull()) {
[QDomElement](qdomelement.html) e = n.toElement(); // try to convert the node to an element.
if(!e.isNull()) {
cout << qPrintable(e.tagName()) << endl; // the node really is an element.
}
n = n.nextSibling();
}
// Here we append a new element to the end of the document
[QDomElement](qdomelement.html) elem = doc.createElement("img");
elem.setAttribute("src", "myimage.png");
docElem.appendChild(elem);
```
一旦`doc`和`elem`走出去的范围,表示XML文档的整个内部树被删除。
若要使用这样的DOM代码使用的文件:
```
QDomDocument doc("MyML");
[QDomElement](qdomelement.html) root = doc.createElement("MyML");
doc.appendChild(root);
[QDomElement](qdomelement.html) tag = doc.createElement("Greeting");
root.appendChild(tag);
[QDomText](qdomtext.html) t = doc.createTextNode("Hello World");
tag.appendChild(t);
[QString](qstring.html) xml = doc.toString();
```
关于文档对象模型更多信息,请参阅文档对象模型(DOM )[Level 1](http://www.w3.org/TR/REC-DOM-Level-1/)和[Level 2 Core](http://www.w3.org/TR/DOM-Level-2-Core/)规格。
* * *
## Method Documentation
```
QDomDocument.__init__ (self)
```
构造一个空文档。
```
QDomDocument.__init__ (self, QString name)
```
创建文档并设置文档类型的名称_name_。
```
QDomDocument.__init__ (self, QDomDocumentType doctype)
```
创建具有文档类型的文档_doctype_。
**See also** [QDomImplementation.createDocumentType](qdomimplementation.html#createDocumentType)( ) 。
```
QDomDocument.__init__ (self, QDomDocument x)
```
构造的副本_x_。
副本的数据是共享的(浅拷贝) :修改一个节点也将改变其他。如果你想使一个深拷贝,使用[cloneNode](qdomnode.html#cloneNode)( ) 。
```
QDomAttr QDomDocument.createAttribute (self, QString name)
```
[](qdomattr.html)
[创建一个名为新的属性_name_该可插入一个元素,例如运用](qdomattr.html)[QDomElement.setAttributeNode](qdomelement.html#setAttributeNode)( ) 。
If _name_是不是一个有效的XML名称,这个函数的行为受约束[QDomImplementation.InvalidDataPolicy](qdomimplementation.html#InvalidDataPolicy-enum)。
**See also** [createAttributeNS](qdomdocument.html#createAttributeNS)( ) 。
```
QDomAttr QDomDocument.createAttributeNS (self, QString nsURI, QString qName)
```
[](qdomattr.html)
[创建一个具有可插入一个元素的命名空间支持一个新的属性。该属性的名称是_qName_和命名空间URI为_nsURI_。该功能还将](qdomattr.html)[QDomNode.prefix](qdomnode.html#prefix)()和[QDomNode.localName](qdomnode.html#localName)( )为适当的值(取决于_qName_) 。
If _qName_是不是一个有效的XML名称,这个函数的行为受约束[QDomImplementation.InvalidDataPolicy](qdomimplementation.html#InvalidDataPolicy-enum)。
**See also** [createAttribute](qdomdocument.html#createAttribute)( ) 。
```
QDomCDATASection QDomDocument.createCDATASection (self, QString data)
```
[](qdomcdatasection.html)
[创建字符串一个新的CDATA节_value_能够被插入到文档中,例如运用](qdomcdatasection.html)[QDomNode.appendChild](qdomnode.html#appendChild)( ) 。
If _value_包含不能被存储在一个CDATA节的字符,这个函数的行为受约束[QDomImplementation.InvalidDataPolicy](qdomimplementation.html#InvalidDataPolicy-enum)。
**See also** [QDomNode.appendChild](qdomnode.html#appendChild)( )[QDomNode.insertBefore](qdomnode.html#insertBefore)()和[QDomNode.insertAfter](qdomnode.html#insertAfter)( ) 。
```
QDomComment QDomDocument.createComment (self, QString data)
```
[](qdomcomment.html)
[创建字符串新评论_value_能够被插入到文档中,例如运用](qdomcomment.html)[QDomNode.appendChild](qdomnode.html#appendChild)( ) 。
If _value_包含不能被存储在XML注释字符,这个函数的行为受约束[QDomImplementation.InvalidDataPolicy](qdomimplementation.html#InvalidDataPolicy-enum)。
**See also** [QDomNode.appendChild](qdomnode.html#appendChild)( )[QDomNode.insertBefore](qdomnode.html#insertBefore)()和[QDomNode.insertAfter](qdomnode.html#insertAfter)( ) 。
```
QDomDocumentFragment QDomDocument.createDocumentFragment (self)
```
[
创建一个新的文档片段,可用于保存文件的部分,例如做文档树的复杂的操作时。
](qdomdocumentfragment.html)
```
QDomElement QDomDocument.createElement (self, QString tagName)
```
[](qdomelement.html)
[创建一个名为新元素_tagName_能够被插入到DOM树中,例如运用](qdomelement.html)[QDomNode.appendChild](qdomnode.html#appendChild)( ) 。
If _tagName_是不是一个有效的XML名称,这个函数的行为受约束[QDomImplementation.InvalidDataPolicy](qdomimplementation.html#InvalidDataPolicy-enum)。
[QDomNode.insertAfter](qdomnode.html#insertAfter)( )
**See also** [createElementNS](qdomdocument.html#createElementNS)( )[QDomNode.appendChild](qdomnode.html#appendChild)()和[QDomNode.insertBefore](qdomnode.html#insertBefore)( ) 。
```
QDomElement QDomDocument.createElementNS (self, QString nsURI, QString qName)
```
[](qdomelement.html)
[创建一个具有可插入到DOM树中的命名空间支持的新元素。元素的名称是_qName_和命名空间URI为_nsURI_。该功能还将](qdomelement.html)[QDomNode.prefix](qdomnode.html#prefix)()和[QDomNode.localName](qdomnode.html#localName)( )为适当的值(取决于_qName_) 。
If _qName_是一个空字符串,返回一个空元素不管无效的数据策略是否被设置。
**See also** [createElement](qdomdocument.html#createElement)( ) 。
```
QDomEntityReference QDomDocument.createEntityReference (self, QString name)
```
[](qdomentityreference.html)
[创建一个名为一个新的实体引用_name_能够被插入到文档中,例如运用](qdomentityreference.html)[QDomNode.appendChild](qdomnode.html#appendChild)( ) 。
If _name_是不是一个有效的XML名称,这个函数的行为受约束[QDomImplementation.InvalidDataPolicy](qdomimplementation.html#InvalidDataPolicy-enum)。
**See also** [QDomNode.appendChild](qdomnode.html#appendChild)( )[QDomNode.insertBefore](qdomnode.html#insertBefore)()和[QDomNode.insertAfter](qdomnode.html#insertAfter)( ) 。
```
QDomProcessingInstruction QDomDocument.createProcessingInstruction (self, QString target, QString data)
```
[](qdomprocessinginstruction.html)
[创建一个新的处理指令可以被插入到文档中,例如运用](qdomprocessinginstruction.html)[QDomNode.appendChild](qdomnode.html#appendChild)( ) 。此功能设置为处理指令的目标_target_以及将数据_data_。
If _target_是不是一个有效的XML名称,或者数据,如果包含不能出现在一个处理指令字符,这个函数的行为受约束[QDomImplementation.InvalidDataPolicy](qdomimplementation.html#InvalidDataPolicy-enum)。
**See also** [QDomNode.appendChild](qdomnode.html#appendChild)( )[QDomNode.insertBefore](qdomnode.html#insertBefore)()和[QDomNode.insertAfter](qdomnode.html#insertAfter)( ) 。
```
QDomText QDomDocument.createTextNode (self, QString data)
```
[](qdomtext.html)
[创建字符串的文本节点_value_能够被插入到文档树,例如运用](qdomtext.html)[QDomNode.appendChild](qdomnode.html#appendChild)( ) 。
If _value_包含不能被保存为一个XML文档(即使在字符引用的形式)的字符数据的字符,这个函数的行为受约束[QDomImplementation.InvalidDataPolicy](qdomimplementation.html#InvalidDataPolicy-enum)。
**See also** [QDomNode.appendChild](qdomnode.html#appendChild)( )[QDomNode.insertBefore](qdomnode.html#insertBefore)()和[QDomNode.insertAfter](qdomnode.html#insertAfter)( ) 。
```
QDomDocumentType QDomDocument.doctype (self)
```
[
返回此文件的文件类型。
](qdomdocumenttype.html)
```
QDomElement QDomDocument.documentElement (self)
```
[
返回文档的根元素。
](qdomelement.html)
```
QDomElement QDomDocument.elementById (self, QString elementId)
```
[](qdomelement.html)
[返回其ID等于元件_elementId_。如果被发现与ID号的元素,这个函数返回一个](qdomelement.html)[null element](qdomnode.html#isNull)。
由于QDomClasses不知道哪个属性是元素的ID ,这个函数返回一个永远[null element](qdomnode.html#isNull)。这可能会改变在未来的版本。
```
QDomNodeList QDomDocument.elementsByTagName (self, QString tagname)
```
[](qdomnodelist.html)
[返回](qdomnodelist.html)[QDomNodeList](qdomnodelist.html),包含所有文件中的名称元素_tagname_。节点列表的顺序是它们在元素树的先序遍历出现的顺序。
**See also** [elementsByTagNameNS](qdomdocument.html#elementsByTagNameNS)()和[QDomElement.elementsByTagName](qdomelement.html#elementsByTagName)( ) 。
```
QDomNodeList QDomDocument.elementsByTagNameNS (self, QString nsURI, QString localName)
```
[](qdomnodelist.html)
[返回](qdomnodelist.html)[QDomNodeList](qdomnodelist.html)包含所有的文件与本地名称的元素_localName_和命名空间的URI_nsURI_。节点列表的顺序是它们在元素树的先序遍历出现的顺序。
**See also** [elementsByTagName](qdomdocument.html#elementsByTagName)()和[QDomElement.elementsByTagNameNS](qdomelement.html#elementsByTagNameNS)( ) 。
```
QDomImplementation QDomDocument.implementation (self)
```
[](qdomimplementation.html)
[返回](qdomimplementation.html)[QDomImplementation](qdomimplementation.html)对象。
```
QDomNode QDomDocument.importNode (self, QDomNode importedNode, bool deep)
```
[
进口的节点_importedNode_从另一个文件于本文件。_importedNode_仍然在原始文档中,该函数创建一个可以在此文档中使用的副本。
](qdomnode.html)
[该函数返回输入节点属于这个文件。返回的节点没有父。这是不可能的导入](qdomnode.html)[QDomDocument](qdomdocument.html)和[QDomDocumentType](qdomdocumenttype.html)节点。在这种情况下,该函数返回一个[null node](qdomnode.html#isNull)。
If _deep_诚然,这个功能的进口不仅节点_importedNode_但它的整个子树,如果它是假的,只有_importedNode_是进口的。这个论点_deep_有对无影响[QDomAttr](qdomattr.html)和[QDomEntityReference](qdomentityreference.html)节点,因为的后代[QDomAttr](qdomattr.html)节点总是进口和那些[QDomEntityReference](qdomentityreference.html)节点永远不会进口。
此函数的行为是稍有不同,这取决于节点类型:
| Node Type | Behavior |
| --- | --- |
| [QDomAttr](qdomattr.html) | The owner element is set to 0 and the specified flag is set to true in the generated attribute. The whole subtree of _importedNode_ is always imported for attribute nodes: _deep_ has no effect. |
| [QDomDocument](qdomdocument.html) | Document nodes cannot be imported. |
| [QDomDocumentFragment](qdomdocumentfragment.html) | If _deep_ is true, this function imports the whole document fragment; otherwise it only generates an empty document fragment. |
| [QDomDocumentType](qdomdocumenttype.html) | Document type nodes cannot be imported. |
| [QDomElement](qdomelement.html) | Attributes for which [QDomAttr.specified](qdomattr.html#specified)() is true are also imported, other attributes are not imported. If _deep_ is true, this function also imports the subtree of _importedNode_; otherwise it imports only the element node (and some attributes, see above). |
| [QDomEntity](qdomentity.html) | Entity nodes can be imported, but at the moment there is no way to use them since the document type is read-only in DOM level 2. |
| [QDomEntityReference](qdomentityreference.html) | Descendants of entity reference nodes are never imported: _deep_ has no effect. |
| [QDomNotation](qdomnotation.html) | Notation nodes can be imported, but at the moment there is no way to use them since the document type is read-only in DOM level 2. |
| [QDomProcessingInstruction](qdomprocessinginstruction.html) | The target and value of the processing instruction is copied to the new node. |
| [QDomText](qdomtext.html) | The text is copied to the new node. |
| [QDomCDATASection](qdomcdatasection.html) | The text is copied to the new node. |
| [QDomComment](qdomcomment.html) | The text is copied to the new node. |
[QDomNode.insertAfter](qdomnode.html#insertAfter)( )[QDomNode.replaceChild](qdomnode.html#replaceChild)( )[QDomNode.removeChild](qdomnode.html#removeChild)( )[QDomNode.appendChild](qdomnode.html#appendChild)( )
**See also** [QDomElement.setAttribute](qdomelement.html#setAttribute)()和[QDomNode.insertBefore](qdomnode.html#insertBefore)( ) 。
```
QDomNode.NodeType QDomDocument.nodeType (self)
```
[
Returns `DocumentNode`。
```
(bool, QString errorMsg, int errorLine, int errorColumn) QDomDocument.setContent (self, QByteArray data, bool namespaceProcessing)
```
该函数从字节数组解析XML文档_data_并且将其设置为文件的内容。它会尝试检测文件的编码所要求的XML规范。
If _namespaceProcessing_诚然,解析器识别命名空间的XML文件中,并设置前缀名,本地名称和命名空间URI为适当的值。如果_namespaceProcessing_是假的,解析器确实没有命名空间的处理时,它读取XML文件。
](qdomnode.html#NodeType-enum)
[如果出现语法错误,这个函数返回False ,并且错误信息被放置在`*`_errorMsg_中的行号`*`_errorLine_并且在列号`*`_errorColumn_(除非相关指针设置为0 ) ,否则该函数返回True。各种错误信息的描述](qdomnode.html#NodeType-enum)[QXmlParseException](qxmlparseexception.html)类文档。需要注意的是,如果你想显示这些错误信息到您的应用程序的用户,他们将,除非他们明确地翻译英文显示。
If _namespaceProcessing_为真时,函数[QDomNode.prefix](qdomnode.html#prefix)( )返回一个字符串的所有元素和属性。它返回一个空字符串,如果该元素或属性没有前缀。
空白只包括文本节点被剥离,而不会出现在[QDomDocument](qdomdocument.html)。如果这种行为是不是需要,可以使用使用setContent ()重载,允许[QXmlReader](qxmlreader.html)要被提供。
If _namespaceProcessing_是假的,功能[QDomNode.prefix](qdomnode.html#prefix)( )[QDomNode.localName](qdomnode.html#localName)()和[QDomNode.namespaceURI](qdomnode.html#namespaceURIx)( )返回一个空字符串。
实体引用的处理方式如下:
* References to internal general entities and character entities occurring in the content are included. The result is a [QDomText](qdomtext.html) node with the references replaced by their corresponding entity values.
* References to parameter entities occurring in the internal subset are included. The result is a [QDomDocumentType](qdomdocumenttype.html) node which contains entity and notation declarations with the references replaced by their corresponding entity values.
* Any general parsed entity reference which is not defined in the internal subset and which occurs in the content is represented as a [QDomEntityReference](qdomentityreference.html) node.
* Any parsed entity reference which is not defined in the internal subset and which occurs outside of the content is replaced with an empty string.
* Any unparsed entity reference is replaced with an empty string.
[QDomNode.prefix](qdomnode.html#prefix)( )[QString.isNull](qstring.html#isNull)( )[QString.isEmpty](qstring.html#isEmpty)( )
**Warning:**此功能不[reentrant](index.htm#reentrant)。
**See also** [QDomNode.namespaceURI](qdomnode.html#namespaceURIx)()和[QDomNode.localName](qdomnode.html#localName)( ) 。
```
(bool, QString errorMsg, int errorLine, int errorColumn) QDomDocument.setContent (self, QString text, bool namespaceProcessing)
```
这是一个重载函数。
该函数从字符串读取XML文档_text_,返回True,如果内容被成功解析,否则返回False 。自_text_已经是一个Unicode字符串,没有编码检测完成。
```
(bool, QString errorMsg, int errorLine, int errorColumn) QDomDocument.setContent (self, QIODevice dev, bool namespaceProcessing)
```
这是一个重载函数。
该函数读取从IO设备的XML文档_dev_,返回True,如果内容被成功解析,否则返回False 。
```
(bool, QString errorMsg, int errorLine, int errorColumn) QDomDocument.setContent (self, QXmlInputSource source, bool namespaceProcessing)
```
这是一个重载函数。
该函数从XML文档[QXmlInputSource](qxmlinputsource.html) _source_,返回True,如果内容被成功解析,否则返回False 。
此功能被引入Qt的4.5 。
```
(bool, QString errorMsg, int errorLine, int errorColumn) QDomDocument.setContent (self, QByteArray buffer)
```
这是一个重载函数。
该函数从字符串读取XML文档_text_,返回True,如果内容被成功解析,否则返回False 。自_text_已经是一个Unicode字符串,不进行任何编码检测。
不执行任何命名空间的处理要么。
```
(bool, QString errorMsg, int errorLine, int errorColumn) QDomDocument.setContent (self, QString text)
```
这是一个重载函数。
该函数读取从字节数组的XML文档_buffer_,返回True,如果内容被成功解析,否则返回False 。
不执行任何命名空间的处理。
```
(bool, QString errorMsg, int errorLine, int errorColumn) QDomDocument.setContent (self, QIODevice dev)
```
这是一个重载函数。
该函数读取从IO设备的XML文档_dev_,返回True,如果内容被成功解析,否则返回False 。
不执行任何命名空间的处理。
```
(bool, QString errorMsg, int errorLine, int errorColumn) QDomDocument.setContent (self, QXmlInputSource source, QXmlReader reader)
```
这是一个重载函数。
该函数从XML文档[QXmlInputSource](qxmlinputsource.html) _source_并与解析它[QXmlReader](qxmlreader.html) _reader_,返回True,如果内容被成功解析,否则返回False 。
此功能不会改变的特点_reader_。如果你想使用某些功能解析您可以使用此功能来设立适当的读者。
**See also** [QXmlSimpleReader](qxmlsimplereader.html)。
```
QByteArray QDomDocument.toByteArray (self, int indent = 1)
```
[](qbytearray.html)
[解析后的文档转换回其文字表述,并返回一个](qbytearray.html)[QByteArray](qbytearray.html)含有编码为UTF- 8的数据。
此函数使用_indent_由于空间的子元素缩进量。
**See also** [toString](qdomdocument.html#toString)( ) 。
```
QString QDomDocument.toString (self, int indent = 1)
```
解析后的文档转换回其文字表述。
此函数使用_indent_由于空间的子元素缩进量。
If _indent_为-1 ,任何空白都被添加。
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