| 1 | /****************************************************************************
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| 2 | **
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| 3 | ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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| 4 | ** All rights reserved.
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| 5 | ** Contact: Nokia Corporation (qt-info@nokia.com)
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| 6 | **
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| 7 | ** This file is part of the documentation of the Qt Toolkit.
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| 8 | **
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| 9 | ** $QT_BEGIN_LICENSE:FDL$
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| 10 | ** Commercial Usage
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| 11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 12 | ** accordance with the Qt Commercial License Agreement provided with the
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| 13 | ** Software or, alternatively, in accordance with the terms contained in a
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| 14 | ** written agreement between you and Nokia.
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| 15 | **
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| 16 | ** GNU Free Documentation License
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| 17 | ** Alternatively, this file may be used under the terms of the GNU Free
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| 18 | ** Documentation License version 1.3 as published by the Free Software
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| 19 | ** Foundation and appearing in the file included in the packaging of this
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| 20 | ** file.
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| 21 | **
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| 22 | ** If you have questions regarding the use of this file, please contact
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| 23 | ** Nokia at qt-info@nokia.com.
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| 24 | ** $QT_END_LICENSE$
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| 25 | **
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| 26 | ****************************************************************************/
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| 27 |
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| 28 | /*!
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| 29 | \example xml/xmlstreamlint
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| 30 | \title XML Stream Lint Example
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| 31 |
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| 32 | The XML Stream Lint example provides a simple command line utility that
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| 33 | accepts a file name as its single argument and writes it to the standard
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| 34 | output file.
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| 35 |
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| 36 | The specified file is parsed using an QXmlStreamReader object and written
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| 37 | to the standard output file using an QXmlStreamWriter object. If the file
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| 38 | does not contain a well-formed XML document or the use of namespaces in
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| 39 | the document is incorrect, a description of the error is printed to
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| 40 | the standard error file and will appear in the console.
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| 41 |
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| 42 | \section1 Basic Operation
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| 43 |
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| 44 | The main function of the example opens the file specified by the user
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| 45 | for input (\c inputFile), and it uses QFile to access the standard output
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| 46 | file.
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| 47 |
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| 48 | Reading XML is handled by an instance of the QXmlStreamReader class, which
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| 49 | operates on the input file object; writing is handled by an instance of
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| 50 | QXmlStreamWriter operating on the output file object:
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| 51 |
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| 52 | \snippet examples/xml/xmlstreamlint/main.cpp 0
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| 53 |
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| 54 | The work of parsing and rewriting the XML is done in a while loop, and is
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| 55 | driven by input from the reader:
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| 56 |
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| 57 | \snippet examples/xml/xmlstreamlint/main.cpp 1
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| 58 |
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| 59 | If more input is available, the next token from the input file is read
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| 60 | and parsed. If an error occurred, information is written to the standard
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| 61 | error file via a stream, and the example exits by returning a non-zero
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| 62 | value from the main function.
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| 63 |
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| 64 | \snippet examples/xml/xmlstreamlint/main.cpp 2
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| 65 |
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| 66 | For valid input, the writer is fed the current token from the reader,
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| 67 | and this is written to the output file that was specified when it was
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| 68 | constructed.
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| 69 |
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| 70 | When there is no more input, the loop terminates, and the example can
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| 71 | exit successfully.
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| 72 | */
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