The QXmlSimpleReader class provides an implementation of a simple XML parser. More...

Inheritance diagram for QtXml.QXmlSimpleReader:

Collaboration diagram for QtXml.QXmlSimpleReader:

Public Member Functions
	QXmlSimpleReader ()


override void	CreateProxy ()

new bool	Feature (string name)


override bool	Feature (string name, ref bool ok)


override bool	HasFeature (string name)


override bool	HasProperty (string name)


override bool	Parse (QXmlInputSource input)


virtual bool	Parse (QXmlInputSource input, bool incremental)


virtual bool	ParseContinue ()


override void	SetFeature (string name, bool value)


new void	Dispose ()

Public Member Functions inherited from QtXml.QXmlReader
	QXmlReader ()

	QXmlReader (QXmlReader copy)

new bool	Feature (string name)


new void	Dispose ()

Protected Member Functions
	QXmlSimpleReader (System.Type dummy)

Protected Member Functions inherited from QtXml.QXmlReader
	QXmlReader (System.Type dummy)

Properties
override QXmlContentHandler	ContentHandler `[get, set]`


override IQXmlDTDHandler	DTDHandler `[get, set]`


override IQXmlDeclHandler	DeclHandler `[get, set]`


override IQXmlEntityResolver	EntityResolver `[get, set]`


override IQXmlErrorHandler	ErrorHandler `[get, set]`


override IQXmlLexicalHandler	LexicalHandler `[get, set]`


Properties inherited from QtXml.QXmlReader
abstract QXmlContentHandler	ContentHandler `[get, set]`


abstract IQXmlDTDHandler	DTDHandler `[get, set]`


abstract IQXmlDeclHandler	DeclHandler `[get, set]`


abstract IQXmlEntityResolver	EntityResolver `[get, set]`


abstract IQXmlErrorHandler	ErrorHandler `[get, set]`


abstract IQXmlLexicalHandler	LexicalHandler `[get, set]`


virtual System.IntPtr	SmokeObject `[get, set]`

Additional Inherited Members
Protected Attributes inherited from QtXml.QXmlReader
SmokeInvocation	interceptor

Detailed Description

The QXmlSimpleReader class provides an implementation of a simple XML parser.

This XML reader is suitable for a wide range of applications. It is able to parse well-formed XML and can report the namespaces of elements to a content handler; however, it does not parse any external entities. For historical reasons, Attribute Value Normalization and End-of-Line Handling as described in the XML 1.0 specification is not performed.

The easiest pattern of use for this class is to create a reader instance, define an input source, specify the handlers to be used by the reader, and parse the data.

For example, we could use a QFile to supply the input. Here, we create a reader, and define an input source to be used by the reader:

QXmlSimpleReader xmlReader;

QXmlInputSource *source = new QXmlInputSource(file);

A handler lets us perform actions when the reader encounters certain types of content, or if errors in the input are found. The reader must be told which handler to use for each type of event. For many common applications, we can create a custom handler by subclassing QXmlDefaultHandler, and use this to handle both error and content events:

Handler *handler = new Handler;

xmlReader.setContentHandler(handler);

xmlReader.setErrorHandler(handler);

If you don't set at least the content and error handlers, the parser will fall back on its default behavior—and will do nothing.

The most convenient way to handle the input is to read it in a single pass using the parse() function with an argument that specifies the input source:

bool ok = xmlReader.parse(source);

if (!ok)

std::cout << "Parsing failed." << std::endl;

If you can't parse the entire input in one go (for example, it is huge, or is being delivered over a network connection), data can be fed to the parser in pieces. This is achieved by telling parse() to work incrementally, and making subsequent calls to the parseContinue() function, until all the data has been processed.

A common way to perform incremental parsing is to connect the readyRead() signal of a network reply a slot, and handle the incoming data there. See QNetworkAccessManager.

Aspects of the parsing behavior can be adapted using setFeature() and setProperty().

xmlReader.setFeature("http://xml.org/sax/features/namespace-prefixes", true);

QXmlSimpleReader is not reentrant. If you want to use the class in threaded code, lock the code using QXmlSimpleReader with a locking mechanism, such as a QMutex.

Constructor & Destructor Documentation

QtXml.QXmlSimpleReader.QXmlSimpleReader ( System.Type dummy )

protected

QtXml.QXmlSimpleReader.QXmlSimpleReader ( )

Constructs a simple XML reader.

Member Function Documentation

override void QtXml.QXmlSimpleReader.CreateProxy ( )

virtual

Reimplemented from QtXml.QXmlReader.

new void QtXml.QXmlSimpleReader.Dispose ( )

new bool QtXml.QXmlSimpleReader.Feature ( string name )

Reimplemented from QXmlReader::feature().

See also setFeature().

Implements QtXml.QXmlReader.

override bool QtXml.QXmlSimpleReader.HasFeature ( string name )

virtual

Reimplemented from QXmlReader::hasFeature().

Implements QtXml.QXmlReader.

override bool QtXml.QXmlSimpleReader.HasProperty ( string name )

virtual

Reimplemented from QXmlReader::hasProperty().

Implements QtXml.QXmlReader.

override bool QtXml.QXmlSimpleReader.Parse ( QXmlInputSource input )

virtual

Reimplemented from QXmlReader::parse().

Implements QtXml.QXmlReader.

virtual bool QtXml.QXmlSimpleReader.Parse	(	QXmlInputSource	input,
		bool	incremental
	)

virtual

Reads an XML document from input and parses it. Returns true if the parsing is completed successfully; otherwise returns false, indicating that an error occurred.

If incremental is false, this function will return false if the XML file is not read completely. The parsing cannot be continued in this case.

If incremental is true, the parser does not return false if it reaches the end of the input before reaching the end of the XML file. Instead, it stores the state of the parser so that parsing can be continued later when more data is available. In such a case, you can use the function parseContinue() to continue with parsing. This class stores a pointer to the input source input and the parseContinue() function tries to read from that input source. Therefore, you should not delete the input source input until you no longer need to call parseContinue().

If this function is called with incremental set to true while an incremental parse is in progress, a new parsing session will be started, and the previous session will be lost.

See also parseContinue() and QTcpSocket.

virtual bool QtXml.QXmlSimpleReader.ParseContinue ( )

virtual

Continues incremental parsing, taking input from the QXmlInputSource that was specified with the most recent call to parse(). To use this function, you must have called parse() with the incremental argument set to true.

Returns false if a parsing error occurs; otherwise returns true, even if the end of the XML file has not been reached. You can continue parsing at a later stage by calling this function again when there is more data available to parse.

Calling this function when there is no data available in the input source indicates to the reader that the end of the XML file has been reached. If the input supplied up to this point was not well-formed then a parsing error occurs, and false is returned. If the input supplied was well-formed, true is returned. It is important to end the input in this way because it allows you to reuse the reader to parse other XML files.

Calling this function after the end of file has been reached, but without available data will cause false to be returned whether the previous input was well-formed or not.

See also parse(), QXmlInputSource::data(), and QXmlInputSource::next().

override void QtXml.QXmlSimpleReader.SetFeature	(	string	name,
		bool	value
	)

virtual

Reimplemented from QXmlReader::setFeature().

Turns on the feature name if enable is true; otherwise turns it off.

The name parameter must be one of the following strings:

FeatureDefaultNotes

http://xml.org/sax/features/namespaces true If enabled, namespaces are reported to the content handler.

http://xml.org/sax/features/namespace-prefixes false If enabled, the original prefixed names and attributes used for namespace declarations are reported.

http://trolltech.com/xml/features/report-whitespace-only-CharData true If enabled, CharData that consist of only whitespace characters are reported using QXmlContentHandler::characters(). If disabled, whitespace is silently discarded.

http://trolltech.com/xml/features/report-start-end-entity false If enabled, the parser reports QXmlContentHandler::startEntity() and QXmlContentHandler::endEntity() events, so character data might be reported in chunks. If disabled, the parser does not report these events, but silently substitutes the entities, and reports the character data in one chunk.

See also feature(), hasFeature(), and SAX2 Features.

Implements QtXml.QXmlReader.

Property Documentation

override QXmlContentHandler QtXml.QXmlSimpleReader.ContentHandler

getset

Reimplemented from QXmlReader::contentHandler().

Reimplemented from QXmlReader::setContentHandler().

override IQXmlDeclHandler QtXml.QXmlSimpleReader.DeclHandler

getset

Reimplemented from QXmlReader::declHandler().

Reimplemented from QXmlReader::setDeclHandler().

override IQXmlDTDHandler QtXml.QXmlSimpleReader.DTDHandler

getset

Reimplemented from QXmlReader::DTDHandler().

Reimplemented from QXmlReader::setDTDHandler().

override IQXmlEntityResolver QtXml.QXmlSimpleReader.EntityResolver

getset

Reimplemented from QXmlReader::entityResolver().

Reimplemented from QXmlReader::setEntityResolver().

override IQXmlErrorHandler QtXml.QXmlSimpleReader.ErrorHandler

getset

Reimplemented from QXmlReader::errorHandler().

Reimplemented from QXmlReader::setErrorHandler().

override IQXmlLexicalHandler QtXml.QXmlSimpleReader.LexicalHandler

getset

Reimplemented from QXmlReader::lexicalHandler().

Reimplemented from QXmlReader::setLexicalHandler().

Public Member Functions

Protected Member Functions

Properties

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Property Documentation