Hi all,

I'm having an issue and most likely I am doing this the wrong way but wondered if anyone could help.

Basically I want to take an exiting xml document, query it using xquery/xpath, and create a new xml document. Here's what I have so far:

XML
Qt Code: 
  1. <?xml version="1.0"?>
  2. <catalog>
  3.    <book id="bk101">
  4.       <author>Gambardella, Matthew</author>
  5.       <title>XML Developer's Guide</title>
  6.       <genre>Computer</genre>
  7.       <price>44.95</price>
  8.       <publish_date>2000-10-01</publish_date>
  9.       <description>An in-depth look at creating applications 
  10.       with XML.</description>
  11.    </book>
  12.    <book id="bk102">
  13.       <author>Ralls, Kim</author>
  14.       <title>Midnight Rain</title>
  15.       <genre>Fantasy</genre>
  16.       <price>5.95</price>
  17.       <publish_date>2000-12-16</publish_date>
  18.       <description>A former architect battles corporate zombies, 
  19.       an evil sorceress, and her own childhood to become queen 
  20.       of the world.</description>
  21.    </book>
  22.    <book id="bk103">
  23.       <author>Corets, Eva</author>
  24.       <title>Maeve Ascendant</title>
  25.       <genre>Fantasy</genre>
  26.       <price>5.95</price>
  27.       <publish_date>2000-11-17</publish_date>
  28.       <description>After the collapse of a nanotechnology 
  29.       society in England, the young survivors lay the 
  30.       foundation for a new society.</description>
  31.    </book>
  32.    <book id="bk104">
  33.       <author>Corets, Eva</author>
  34.       <title>Oberon's Legacy</title>
  35.       <genre>Fantasy</genre>
  36.       <price>5.95</price>
  37.       <publish_date>2001-03-10</publish_date>
  38.       <description>In post-apocalypse England, the mysterious 
  39.       agent known only as Oberon helps to create a new life 
  40.       for the inhabitants of London. Sequel to Maeve 
  41.       Ascendant.</description>
  42.    </book>
  43.    <book id="bk105">
  44.       <author>Corets, Eva</author>
  45.       <title>The Sundered Grail</title>
  46.       <genre>Fantasy</genre>
  47.       <price>5.95</price>
  48.       <publish_date>2001-09-10</publish_date>
  49.       <description>The two daughters of Maeve, half-sisters, 
  50.       battle one another for control of England. Sequel to 
  51.       Oberon's Legacy.</description>
  52.    </book>
  53.    <book id="bk106">
  54.       <author>Randall, Cynthia</author>
  55.       <title>Lover Birds</title>
  56.       <genre>Romance</genre>
  57.       <price>4.95</price>
  58.       <publish_date>2000-09-02</publish_date>
  59.       <description>When Carla meets Paul at an ornithology 
  60.       conference, tempers fly as feathers get ruffled.</description>
  61.    </book>
  62.    <book id="bk107">
  63.       <author>Thurman, Paula</author>
  64.       <title>Splish Splash</title>
  65.       <genre>Romance</genre>
  66.       <price>4.95</price>
  67.       <publish_date>2000-11-02</publish_date>
  68.       <description>A deep sea diver finds true love twenty 
  69.       thousand leagues beneath the sea.</description>
  70.    </book>
  71.    <book id="bk108">
  72.       <author>Knorr, Stefan</author>
  73.       <title>Creepy Crawlies</title>
  74.       <genre>Horror</genre>
  75.       <price>4.95</price>
  76.       <publish_date>2000-12-06</publish_date>
  77.       <description>An anthology of horror stories about roaches,
  78.       centipedes, scorpions  and other insects.</description>
  79.    </book>
  80.    <book id="bk109">
  81.       <author>Kress, Peter</author>
  82.       <title>Paradox Lost</title>
  83.       <genre>Science Fiction</genre>
  84.       <price>6.95</price>
  85.       <publish_date>2000-11-02</publish_date>
  86.       <description>After an inadvertant trip through a Heisenberg
  87.       Uncertainty Device, James Salway discovers the problems 
  88.       of being quantum.</description>
  89.    </book>
  90.    <book id="bk110">
  91.       <author>O'Brien, Tim</author>
  92.       <title>Microsoft .NET: The Programming Bible</title>
  93.       <genre>Computer</genre>
  94.       <price>36.95</price>
  95.       <publish_date>2000-12-09</publish_date>
  96.       <description>Microsoft's .NET initiative is explored in 
  97.       detail in this deep programmer's reference.</description>
  98.    </book>
  99.    <book id="bk111">
  100.       <author>O'Brien, Tim</author>
  101.       <title>MSXML3: A Comprehensive Guide</title>
  102.       <genre>Computer</genre>
  103.       <price>36.95</price>
  104.       <publish_date>2000-12-01</publish_date>
  105.       <description>The Microsoft MSXML3 parser is covered in 
  106.       detail, with attention to XML DOM interfaces, XSLT processing, 
  107.       SAX and more.</description>
  108.    </book>
  109.    <book id="bk112">
  110.       <author>Galos, Mike</author>
  111.       <title>Visual Studio 7: A Comprehensive Guide</title>
  112.       <genre>Computer</genre>
  113.       <price>49.95</price>
  114.       <publish_date>2001-04-16</publish_date>
  115.       <description>Microsoft Visual Studio 7 is explored in depth,looking at how Visual Basic, Visual C++, C#, and ASP+  environment.</description>
  116.    </book>
  117. </catalog>
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Here's the code:

Qt Code: 
  1. QFile file("books.xml");
  2.     QDomDocument doc("books");
  3.  
  4.     if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
  5.         return 0;
  6.     if (!doc.setContent(&file)) {
  7.         file.close();
  8.         return 0;
  9.     }
  10.     file.close();
  11.  
  12.     QByteArray outArray;
  13.     QBuffer buffer(&outArray);
  14.     buffer.open(QIODevice::ReadWrite);
  15.  
  16.     QByteArray inArray = doc.toByteArray();
  17.     QBuffer inBuffer(&inArray);
  18.     inBuffer.open(QIODevice::ReadOnly);
  19.  
  20.     QXmlQuery qry(QXmlQuery::XQuery10);
  21.  
  22.     qry.setFocus(&inBuffer);
  23.     qry.setQuery("/catalog/book/price");
  24.  
  25.     if (qry.isValid()){
  26.         qry.evaluateTo(&buffer);
  27.      }
  28.  
  29.     cout << QString::fromUtf8(outArray.constData()).toStdString() << endl;
  30.  
  31.     QDomDocument newDoc;
  32.     QDomNode xml = newDoc.createProcessingInstruction("xml", "version=\"1.0\"");
  33.  
  34.     QDomElement newRoot = newDoc.createElement("records");
  35.  
  36.     QDomDocument otherDoc;
  37.  
  38.     QString errorMsg;
  39.     int errorLine;
  40.     int errorColumn;
  41.  
  42.     if (!otherDoc.setContent(outArray, &errorMsg, &errorLine))
  43.         cout << errorMsg.toStdString() << ' ' << errorLine << ':' << errorColumn << endl;
  44.  
  45.     newRoot.appendChild(otherDoc);
  46.  
  47.     newDoc.appendChild(xml);
  48.     newDoc.appendChild(newRoot);
  49.  
  50.     cout << newDoc.toString().toStdString() << endl;
  51.  
  52.     buffer.close();
  53.     inBuffer.close();
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And here's the output:
<price>44.95</price><price>5.95</price><price>5.95</price><price>5.95</price><price>5.95</price><price>4.95</price><price>4.95</price><price>4.95</price><price>6.95</price><price>36.95</price><price>36.95</price><price>49.95</price>
unexpected character 1:-1073743404
<?xml version="1.0"?>
<records>
<price>44.95</price>
</records>


Any help is greatly appreciated!

-ck