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Referencia de la Clase QDomDocument

The QDomDocument class represents an XML document.XMLThe QDomDocument class represents the entire XML document. Conceptually, it is the root of the document tree, and provides the primary access to the document's data. Más...

#include <qdom.h>

Diagrama de herencias de QDomDocument
QDomNode QDomNode

Lista de todos los miembros.

Métodos públicos

 QDomDocument ()
Q_EXPLICIT QDomDocument (const QString &name)
Q_EXPLICIT QDomDocument (const QDomDocumentType &doctype)
 QDomDocument (const QDomDocument &x)
QDomDocumentoperator= (const QDomDocument &)
 ~QDomDocument ()
QDomElement createElement (const QString &tagName)
QDomDocumentFragment createDocumentFragment ()
QDomText createTextNode (const QString &data)
QDomComment createComment (const QString &data)
QDomCDATASection createCDATASection (const QString &data)
QDomProcessingInstruction createProcessingInstruction (const QString &target, const QString &data)
QDomAttr createAttribute (const QString &name)
QDomEntityReference createEntityReference (const QString &name)
QDomNodeList elementsByTagName (const QString &tagname) const
QDomNode importNode (const QDomNode &importedNode, bool deep)
QDomElement createElementNS (const QString &nsURI, const QString &qName)
QDomAttr createAttributeNS (const QString &nsURI, const QString &qName)
QDomNodeList elementsByTagNameNS (const QString &nsURI, const QString &localName)
QDomElement elementById (const QString &elementId)
QDomDocumentType doctype () const
QDomImplementation implementation () const
QDomElement documentElement () const
bool setContent (const QCString &text, bool namespaceProcessing, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (const QByteArray &text, bool namespaceProcessing, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (const QString &text, bool namespaceProcessing, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (QIODevice *dev, bool namespaceProcessing, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (const QCString &text, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (const QByteArray &text, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (const QString &text, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (QIODevice *dev, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (QXmlInputSource *source, QXmlReader *reader, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
QDomNode::NodeType nodeType () const
bool isDocument () const
QString toString () const
QString toString (int) const
QCString toCString () const
QCString toCString (int) const
 QDomDocument ()
Q_EXPLICIT QDomDocument (const QString &name)
Q_EXPLICIT QDomDocument (const QDomDocumentType &doctype)
 QDomDocument (const QDomDocument &x)
QDomDocumentoperator= (const QDomDocument &)
 ~QDomDocument ()
QDomElement createElement (const QString &tagName)
QDomDocumentFragment createDocumentFragment ()
QDomText createTextNode (const QString &data)
QDomComment createComment (const QString &data)
QDomCDATASection createCDATASection (const QString &data)
QDomProcessingInstruction createProcessingInstruction (const QString &target, const QString &data)
QDomAttr createAttribute (const QString &name)
QDomEntityReference createEntityReference (const QString &name)
QDomNodeList elementsByTagName (const QString &tagname) const
QDomNode importNode (const QDomNode &importedNode, bool deep)
QDomElement createElementNS (const QString &nsURI, const QString &qName)
QDomAttr createAttributeNS (const QString &nsURI, const QString &qName)
QDomNodeList elementsByTagNameNS (const QString &nsURI, const QString &localName)
QDomElement elementById (const QString &elementId)
QDomDocumentType doctype () const
QDomImplementation implementation () const
QDomElement documentElement () const
bool setContent (const QCString &text, bool namespaceProcessing, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (const QByteArray &text, bool namespaceProcessing, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (const QString &text, bool namespaceProcessing, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (QIODevice *dev, bool namespaceProcessing, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (const QCString &text, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (const QByteArray &text, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (const QString &text, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (QIODevice *dev, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
bool setContent (QXmlInputSource *source, QXmlReader *reader, QString *errorMsg=0, int *errorLine=0, int *errorColumn=0)
QDomNode::NodeType nodeType () const
bool isDocument () const
QString toString () const
QString toString (int) const
QCString toCString () const
QCString toCString (int) const

Amigas

class QDomNode

Descripción detallada

The QDomDocument class represents an XML document.

XML

The QDomDocument class represents the entire XML document. Conceptually, it is the root of the document tree, and provides the primary access to the document's data.

Since elements, text nodes, comments, processing instructions, etc., cannot exist outside the context of a document, the document class also contains the factory functions needed to create these objects. The node objects created have an ownerDocument() function which associates them with the document within whose context they were created. The DOM classes that will be used most often are QDomNode, QDomDocument, QDomElement and QDomText.

The parsed XML is represented internally by a tree of objects that can be accessed using the various QDom classes. All QDom classes only reference objects in the internal tree. The internal objects in the DOM tree will get deleted once the last QDom object referencing them and the QDomDocument itself are deleted.

Creation of elements, text nodes, etc. is done using the various factory functions provided in this class. Using the default constructors of the QDom classes will only result in empty objects that cannot be manipulated or inserted into the Document.

The QDomDocument class has several functions for creating document data, for example, createElement(), createTextNode(), createComment(), createCDATASection(), createProcessingInstruction(), createAttribute() and createEntityReference(). Some of these functions have versions that support namespaces, i.e. createElementNS() and createAttributeNS(). The createDocumentFragment() function is used to hold parts of the document; this is useful for manipulating for complex documents.

The entire content of the document is set with setContent(). This function parses the string it is passed as an XML document and creates the DOM tree that represents the document. The root element is available using documentElement(). The textual representation of the document can be obtained using toString().

It is possible to insert a node from another document into the document using importNode().

You can obtain a list of all the elements that have a particular tag with elementsByTagName() or with elementsByTagNameNS().

The QDom classes are typically used as follows:

    QDomDocument doc( "mydocument" );
    QFile file( "mydocument.xml" );
    if ( !file.open( IO_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 docElem = doc.documentElement();

    QDomNode n = docElem.firstChild();
    while( !n.isNull() ) {
        QDomElement e = n.toElement(); // try to convert the node to an element.
        if( !e.isNull() ) {
            cout << 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 elem = doc.createElement( "img" );
    elem.setAttribute( "src", "myimage.png" );
    docElem.appendChild( elem );

Once doc and elem go out of scope, the whole internal tree representing the XML document is deleted.

To create a document using DOM use code like this:

    QDomDocument doc( "MyML" );
    QDomElement root = doc.createElement( "MyML" );
    doc.appendChild( root );

    QDomElement tag = doc.createElement( "Greeting" );
    root.appendChild( tag );

    QDomText t = doc.createTextNode( "Hello World" );
    tag.appendChild( t );

    QString xml = doc.toString();

For further information about the Document Object Model see http://www.w3.org/TR/REC-DOM-Level-1/ and http://www.w3.org/TR/DOM-Level-2-Core/. For a more general introduction of the DOM implementation see the QDomDocument documentation.


Documentación del constructor y destructor

QDomDocument::QDomDocument ( )

Constructs an empty document.

QDomDocument::QDomDocument ( const QString name)

Creates a document and sets the name of the document type to name.

QDomDocument::QDomDocument ( const QDomDocumentType doctype)

Creates a document with the document type doctype.

Ver también:
QDomImplementation::createDocumentType()
QDomDocument::QDomDocument ( const QDomDocument x)

Constructs a copy of x.

The data of the copy is shared (shallow copy): modifying one node will also change the other. If you want to make a deep copy, use cloneNode().

QDomDocument::~QDomDocument ( )

Destroys the object and frees its resources.

QDomDocument::QDomDocument ( )
Q_EXPLICIT QDomDocument::QDomDocument ( const QString name)
Q_EXPLICIT QDomDocument::QDomDocument ( const QDomDocumentType doctype)
QDomDocument::QDomDocument ( const QDomDocument x)
QDomDocument::~QDomDocument ( )

Documentación de las funciones miembro

QDomAttr QDomDocument::createAttribute ( const QString name)

Creates a new attribute called name that can be inserted into an element, e.g. using QDomElement::setAttributeNode().

Ver también:
createAttributeNS()
QDomAttr QDomDocument::createAttribute ( const QString name)
QDomAttr QDomDocument::createAttributeNS ( const QString nsURI,
const QString qName 
)
QDomAttr QDomDocument::createAttributeNS ( const QString nsURI,
const QString qName 
)

Creates a new attribute with namespace support that can be inserted into an element. The name of the attribute is qName and the namespace URI is nsURI. This function also sets QDomNode::prefix() and QDomNode::localName() to appropriate values (depending on qName).

Ver también:
createAttribute()
QDomCDATASection QDomDocument::createCDATASection ( const QString data)
QDomCDATASection QDomDocument::createCDATASection ( const QString value)

Creates a new CDATA section for the string value that can be inserted into the document, e.g. using QDomNode::appendChild().

Ver también:
QDomNode::appendChild() QDomNode::insertBefore() QDomNode::insertAfter()
QDomComment QDomDocument::createComment ( const QString data)
QDomComment QDomDocument::createComment ( const QString value)

Creates a new comment for the string value that can be inserted into the document, e.g. using QDomNode::appendChild().

Ver también:
QDomNode::appendChild() QDomNode::insertBefore() QDomNode::insertAfter()
QDomDocumentFragment QDomDocument::createDocumentFragment ( )

Creates a new document fragment, that can be used to hold parts of the document, e.g. when doing complex manipulations of the document tree.

QDomDocumentFragment QDomDocument::createDocumentFragment ( )
QDomElement QDomDocument::createElement ( const QString tagName)
QDomElement QDomDocument::createElement ( const QString tagName)

Creates a new element called tagName that can be inserted into the DOM tree, e.g. using QDomNode::appendChild().

Ver también:
createElementNS() QDomNode::appendChild() QDomNode::insertBefore() QDomNode::insertAfter()
QDomElement QDomDocument::createElementNS ( const QString nsURI,
const QString qName 
)
QDomElement QDomDocument::createElementNS ( const QString nsURI,
const QString qName 
)

Creates a new element with namespace support that can be inserted into the DOM tree. The name of the element is qName and the namespace URI is nsURI. This function also sets QDomNode::prefix() and QDomNode::localName() to appropriate values (depending on qName).

Ver también:
createElement()
QDomEntityReference QDomDocument::createEntityReference ( const QString name)

Creates a new entity reference called name that can be inserted into the document, e.g. using QDomNode::appendChild().

Ver también:
QDomNode::appendChild() QDomNode::insertBefore() QDomNode::insertAfter()
QDomEntityReference QDomDocument::createEntityReference ( const QString name)
QDomProcessingInstruction QDomDocument::createProcessingInstruction ( const QString target,
const QString data 
)
QDomProcessingInstruction QDomDocument::createProcessingInstruction ( const QString target,
const QString data 
)

Creates a new processing instruction that can be inserted into the document, e.g. using QDomNode::appendChild(). This function sets the target for the processing instruction to target and the data to data.

Ver también:
QDomNode::appendChild() QDomNode::insertBefore() QDomNode::insertAfter()
QDomText QDomDocument::createTextNode ( const QString data)
QDomText QDomDocument::createTextNode ( const QString value)

Creates a text node for the string value that can be inserted into the document tree, e.g. using QDomNode::appendChild().

Atención:
All characters within an XML document must be in the range:

#x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]

This rule also applies to characters encoded as character entities and characters in CDATA sections. If you use this function to insert characters outside of this range, the document will not be well-formed.

If you want to store binary data in an XML document you must either use your own scheme to escape illegal characters, or you must store it in an external unparsed entity.

Ver también:
QDomNode::appendChild() QDomNode::insertBefore() QDomNode::insertAfter()
QDomDocumentType QDomDocument::doctype ( ) const

Returns the document type of this document.

QDomDocumentType QDomDocument::doctype ( ) const
QDomElement QDomDocument::documentElement ( ) const

Returns the root element of the document.

QDomElement QDomDocument::documentElement ( ) const
QDomElement QDomDocument::elementById ( const QString elementId)
QDomElement QDomDocument::elementById ( const QString elementId)

Returns the element whose ID is equal to elementId. If no element with the ID was found, this function returns a null element.

Since the QDomClasses do not know which attributes are element IDs, this function returns always a null element. This may change in a future version.

QDomNodeList QDomDocument::elementsByTagName ( const QString tagname) const

Returns a QDomNodeList, that contains all the elements in the document with the name tagname. The order of the node list is the order they are encountered in a preorder traversal of the element tree.

Ver también:
elementsByTagNameNS() QDomElement::elementsByTagName()
QDomNodeList QDomDocument::elementsByTagName ( const QString tagname) const
QDomNodeList QDomDocument::elementsByTagNameNS ( const QString nsURI,
const QString localName 
)
QDomNodeList QDomDocument::elementsByTagNameNS ( const QString nsURI,
const QString localName 
)

Returns a QDomNodeList that contains all the elements in the document with the local name localName and a namespace URI of nsURI. The order of the node list is the order they are encountered in a preorder traversal of the element tree.

Ver también:
elementsByTagName() QDomElement::elementsByTagNameNS()
QDomImplementation QDomDocument::implementation ( ) const

Returns a QDomImplementation object.

QDomImplementation QDomDocument::implementation ( ) const
QDomNode QDomDocument::importNode ( const QDomNode importedNode,
bool  deep 
)
QDomNode QDomDocument::importNode ( const QDomNode importedNode,
bool  deep 
)

Imports the node importedNode from another document to this document. importedNode remains in the original document; this function creates a copy that can be used within this document.

This function returns the imported node that belongs to this document. The returned node has no parent. It is not possible to import QDomDocument and QDomDocumentType nodes. In those cases this function returns a null node.

If deep is TRUE, this function imports not only the node importedNode but its whole subtree; if it is FALSE, only the importedNode is imported. The argument deep has no effect on QDomAttr and QDomEntityReference nodes, since the descendents of QDomAttr nodes are always imported and those of QDomEntityReference nodes are never imported.

The behavior of this function is slightly different depending on the node types: Node Type Behaviour QDomAttr 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 Document nodes cannot be imported. QDomDocumentFragment If deep is TRUE, this function imports the whole document fragment; otherwise it only generates an empty document fragment. QDomDocumentType Document type nodes cannot be imported. QDomElement Attributes for which QDomAttr::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 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 Descendents of entity reference nodes are never imported: deep has no effect. QDomNotation 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 The target and value of the processing instruction is copied to the new node. QDomText The text is copied to the new node. QDomCDATASection The text is copied to the new node. QDomComment The text is copied to the new node.

Ver también:
QDomElement::setAttribute() QDomNode::insertBefore() QDomNode::insertAfter() QDomNode::replaceChild() QDomNode::removeChild() QDomNode::appendChild()
bool QDomDocument::isDocument ( ) const [virtual]

Returns TRUE.

Reimplementado de QDomNode.

bool QDomDocument::isDocument ( ) const [virtual]

Returns TRUE if the node is a document; otherwise returns FALSE.

If this function returns TRUE, it does not imply that this object is a QDomDocument; you can get the QDomDocument with toDocument().

Ver también:
toDocument()

Reimplementado de QDomNode.

QDomNode::NodeType QDomDocument::nodeType ( ) const [virtual]

Returns DocumentNode.

Reimplementado de QDomNode.

QDomNode::NodeType QDomDocument::nodeType ( ) const [virtual]
QDomDocument & QDomDocument::operator= ( const QDomDocument x)

Assigns x to this DOM document.

The data of the copy is shared (shallow copy): modifying one node will also change the other. If you want to make a deep copy, use cloneNode().

QDomDocument& QDomDocument::operator= ( const QDomDocument )
bool QDomDocument::setContent ( QXmlInputSource source,
QXmlReader reader,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. This function reads the XML document from the QXmlInputSource source and parses it with the QXmlReader reader.

This function doesn't change the features of the reader. If you want to use certain features for parsing you can use this function to set up the reader appropriate.

Ver también:
QXmlSimpleReader
bool QDomDocument::setContent ( const QCString text,
bool  namespaceProcessing,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)
bool QDomDocument::setContent ( const QCString text,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)
bool QDomDocument::setContent ( const QByteArray buffer,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. This function reads the XML document from the byte array buffer.

No namespace processing is performed.

bool QDomDocument::setContent ( const QCString buffer,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. This function reads the XML document from the C string buffer.

No namespace processing is performed.

Atención:
This function does not try to detect the encoding: instead it assumes that the C string is UTF-8 encoded.
bool QDomDocument::setContent ( const QByteArray text,
bool  namespaceProcessing,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)
bool QDomDocument::setContent ( const QString text,
bool  namespaceProcessing,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. This function reads the XML document from the string text. Since text is already a Unicode string, no encoding detection is done.

bool QDomDocument::setContent ( QIODevice dev,
bool  namespaceProcessing,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)
bool QDomDocument::setContent ( const QCString buffer,
bool  namespaceProcessing,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. This function reads the XML document from the C string buffer.

Atención:
This function does not try to detect the encoding: instead it assumes that the C string is UTF-8 encoded.
bool QDomDocument::setContent ( QIODevice dev,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)
bool QDomDocument::setContent ( const QByteArray buffer,
bool  namespaceProcessing,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)

This function parses the XML document from the byte array buffer and sets it as the content of the document. It tries to detect the encoding of the document as required by the XML specification.

If namespaceProcessing is TRUE, the parser recognizes namespaces in the XML file and sets the prefix name, local name and namespace URI to appropriate values. If namespaceProcessing is FALSE, the parser does no namespace processing when it reads the XML file.

If a parse error occurs, the function returns FALSE; otherwise it returns TRUE. If a parse error occurs and errorMsg, errorLine and errorColumn are not 0, the error message is placed in *errorMsg, the line number *errorLine and the column number in *errorColumn.

If namespaceProcessing is TRUE, the function QDomNode::prefix() returns a string for all elements and attributes. It returns an empty string if the element or attribute has no prefix.

If namespaceProcessing is FALSE, the functions QDomNode::prefix(), QDomNode::localName() and QDomNode::namespaceURI() return QString::null.

Ver también:
QDomNode::namespaceURI() QDomNode::localName() QDomNode::prefix() QString::isNull() QString::isEmpty()
bool QDomDocument::setContent ( QXmlInputSource source,
QXmlReader reader,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)
bool QDomDocument::setContent ( const QString text,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)
bool QDomDocument::setContent ( const QByteArray text,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)
bool QDomDocument::setContent ( QIODevice dev,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. This function reads the XML document from the IO device dev.

No namespace processing is performed.

bool QDomDocument::setContent ( QIODevice dev,
bool  namespaceProcessing,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. This function reads the XML document from the IO device dev.

bool QDomDocument::setContent ( const QString text,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. This function reads the XML document from the string text. Since text is already a Unicode string, no encoding detection is performed.

No namespace processing is performed either.

bool QDomDocument::setContent ( const QString text,
bool  namespaceProcessing,
QString errorMsg = 0,
int errorLine = 0,
int errorColumn = 0 
)
QCString QDomDocument::toCString ( int  indent) const

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. This function uses indent as the amount of space to indent subelements.

QCString QDomDocument::toCString ( int  ) const
QCString QDomDocument::toCString ( ) const
QCString QDomDocument::toCString ( ) const

Converts the parsed document back to its textual representation and returns a QCString for that is encoded in UTF-8.

Ver también:
toString()
QString QDomDocument::toString ( int  ) const
QString QDomDocument::toString ( int  indent) const

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. This function uses indent as the amount of space to indent subelements.

QString QDomDocument::toString ( ) const
QString QDomDocument::toString ( ) const

Converts the parsed document back to its textual representation.

Ver también:
toCString()

Documentación de las funciones relacionadas y clases amigas

QDomNode [friend]

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