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Thread: XML Dom parsing function

  1. 13th May 2010, 04:46 #1
    FoleyX90
    FoleyX90 is offline Novice
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    Lightbulb XML Dom parsing function

    Hi, everyone! I wanted to thank everybody for the help they've gave me while I've been on these forums. Now, it's my turn to contribute toward this community. I recently wrote a function to read from an XML file using a path. This supports attributes AND indexing. Here it is:
    Qt Code: 
    1. QString XmlUtils::GetData(QString path)
    2. {
    3.     QDomDocument doc("myDocument");
    4.     QFile *xmlFile = new QFile("file.xml");
    5.     doc.setContent(xmlFile);
    6.     QDomElement docElement = doc.documentElement();
    7.     QDomNode node;
    8.     node = docElement.firstChild();
    9.  
    10.     QStringList pathFiles;
    11.     QString returnString;
    12.     pathFiles = path.split("/");
    13.     int curindex = 0;
    14.  
    15.     for(int i = 0; i < pathFiles.length(); i++)
    16.     {
    17.         QString curpath = pathFiles[i];
    18.         if(curpath.startsWith('@'))
    19.         {
    20.             node = node.parentNode();
    21.             curpath = curpath.remove('@');
    22.             returnString = node.attributes().namedItem(curpath).nodeValue();
    23.         }
    24.         else
    25.         {
    26.             if(curpath.contains('['))
    27.             {
    28.                 QStringList subPathFile = curpath.split('[');
    29.                 QString subIndex = subPathFile[1];
    30.                 subIndex = subIndex.remove(']');
    31.                 QString subNode = subPathFile[0];
    32.                 for(int x = 0; x < node.parentNode().childNodes().length(); x++)
    33.                 {
    34.                     if(node.nodeName() == subNode)
    35.                     {
    36.                         if(pathFiles[i] == pathFiles.back())
    37.                         {
    38.                             if(node.parentNode().childNodes().item(subIndex.toInt()).nodeName() == subNode)
    39.                                 returnString = node.parentNode().childNodes().item(subIndex.toInt()).firstChild().nodeValue();
    40.                             break;
    41.                         }
    42.                         else
    43.                             node = node.parentNode().childNodes().item(subIndex.toInt());
    44.                     }
    45.                 }
    46.                node = node.firstChild();
    47.  
    48.             }
    49.             else
    50.             {
    51.                 for(int x = 0; x < node.parentNode().childNodes().length(); x++)
    52.                     {
    53.                         if(node.nodeName() == pathFiles[i])
    54.                         {
    55.                             if(pathFiles[i] == pathFiles.back())
    56.                             {
    57.                                     if(node.nodeName() == pathFiles[i])
    58.                                         returnString = node.firstChild().nodeValue();
    59.                                     break;     
    60.                             }
    61.  
    62.                         }
    63.                         else
    64.                             node = node.nextSibling();
    65.                     }
    66.                 node = node.firstChild();
    67.             }
    68.         }
    69.  
    70.     }
    71.     return returnString;
    72. }
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    How to use it:
    Say you have the xml file:

    <xml>
    <Family>
    <Foley>Justin</Foley>
    <Foley>Ashley</Foley>
    <Foley>Gavin</Foley>
    </Family>
    </xml>

    And you want to get the value of 'Ashley.'
    What you would do is:
    QString name = XmlUtils->GetData("Family/Foley[1]");
    The variable, 'name' would now be index [1] of the nodeset, 'Foley'. Please, enjoy and let me know if anybody does not understand. Praise is also accepted.
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  2. 13th May 2010, 04:58 #2
    FoleyX90
    FoleyX90 is offline Novice
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    Default Re: XML Dom parsing function

    add the code:
    Qt Code: 
    1. node = node.firstChild();
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    right after line: 22. This will support early attributing. I.E. Family/@Foley/Foley[0]/@First if your XML looks like this:

    Qt Code: 
    1. <xml>
    2. <Family Name="Foley">
    3. <Foley First="Justin">Justin</Foley>
    4. <Foley First="Ashley">asdf</Foley>
    5. <Foley>Gavin</Foley>
    6. </Family>
    7. </xml>
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  3. 13th May 2010, 07:17 #3
    Lykurg
    Lykurg is offline Guru
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    Default Re: XML Dom parsing function

    Did you notice QXmlQuery? It makes exactly what your custom function does...
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  4. 13th May 2010, 15:25 #4
    FoleyX90
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    Default Re: XML Dom parsing function

    No, I did not. Thank you for enlightening me.

    UPDATED CODE:

    Qt Code: 
    1. QString XmlUtils::GetData(QString path)
    2. {
    3.     QDomDocument doc("myDocument");
    4.     QFile *xmlFile = new QFile("personaldata.xml");
    5.     doc.setContent(xmlFile);
    6.     QDomElement docElement = doc.documentElement();
    7.     QDomNode node;
    8.     node = docElement.firstChild();
    9.  
    10.     QStringList pathFiles;
    11.     QString returnString;
    12.     pathFiles = path.split("/");
    13.  
    14.     for(int i = 0; i < pathFiles.length(); i++)
    15.     {
    16.         QString curpath = pathFiles[i];
    17.         if(curpath.startsWith('@'))
    18.         {
    19.             curpath = curpath.remove('@');
    20.             QString rightNode = pathFiles[i-1];
    21.             if(rightNode.contains('['))
    22.             {
    23.                 QStringList rightNodeChildren = rightNode.split('[');
    24.                 rightNode = rightNodeChildren[0];
    25.             }
    26.                 if(node.nodeName() != rightNode)
    27.                     node = node.parentNode();
    28.             return node.attributes().namedItem(curpath).nodeValue();
    29.         }
    30.         else
    31.         {
    32.             if(curpath.contains('['))
    33.             {
    34.                 QStringList subPathFile = curpath.split('[');
    35.                 QString subIndex = subPathFile[1];
    36.                 subIndex = subIndex.remove(']');
    37.                 QString subNode = subPathFile[0];
    38.                 for(unsigned int x = 0; x < node.parentNode().childNodes().length(); x++)
    39.                 {
    40.                     if(node.nodeName() == subNode)
    41.                     {
    42.                         if(pathFiles[i] == pathFiles.back())
    43.                         {
    44.                             if(node.parentNode().childNodes().item(subIndex.toInt()).nodeName() == subNode)
    45.                                // return node.parentNode().childNodes().item(subIndex.toInt()).nodeName();
    46.                                 returnString = node.parentNode().childNodes().item(subIndex.toInt()).firstChild().nodeValue();
    47.                             break;
    48.                         }
    49.                         else
    50.                             node = node.parentNode().childNodes().item(subIndex.toInt());
    51.                     }
    52.                 }
    53.                 if(node.hasChildNodes())
    54.                     node = node.firstChild();
    55.  
    56.             }
    57.             else
    58.             {
    59.                 for(unsigned int x = 0; x < node.parentNode().childNodes().length(); x++)
    60.                     {
    61.                         if(node.nodeName() == pathFiles[i])
    62.                         {
    63.                             if(pathFiles[i] == pathFiles.back())
    64.                             {
    65.                                     if(node.nodeName() == pathFiles[i])
    66.                                         returnString = node.firstChild().nodeValue();
    67.                                     break;
    68.                             }
    69.  
    70.                         }
    71.                         else
    72.                             node = node.nextSibling();
    73.                     }
    74.                 if(node.hasChildNodes())
    75.                     node = node.firstChild();
    76.             }
    77.         }
    78.  
    79.     }
    80.     return returnString;
    81. }
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