XML parsing

akshay123

I am new to Qt

I am developing application to parse the XML file. But the File format looks like this

<Class name="ABC">
    <LayoutEntry name="ABB"            type="class:ABB"/>
    <LayoutEntry name="ACC"            type="class:ACC"/>
    <LayoutEntry name="ADD"            type="class:ADD"/>
 </Class>

 <Class name="ABB">   //Declared  in class ABC
    <LayoutEntry name="ABB1"            type="class:ABB1"/>
    <LayoutEntry name="ABB2"            type="class:ABB2"/>
  </Class>

  <Class name="ABB1">  //Declared in class ABB
    <LayoutEntry name="ABB1"            value=ABB1"/>
  </Class>

  <Class name="ABB2">
    <LayoutEntry name="ABB2"            value=ABB2"/>
  </Class>

Please some one suggest me for any library or method in Qt to parse this type of XML . Thanks

Edit: Added code tags -- @Wieland

JohanSolo

You should give a look at the docs. If you only want to read files, QXmlStreamReader does everything you need.

akshay123

since you can see that there is a class inside class i.e nested class , Which library will be fine for doing this

yuvaram

Hi @akshay123 ,

Slide modification in have made for the XML provided, i have added root tag <ClassRoot>.
Below program may help you.
void xmlparsing::DecodeXML()
{
qDebug()<<Q_FUNC_INFO<<endl;
QDomDocument DdocObj;
QFile fobj("class.xml");
if (!fobj.open(QIODevice::ReadOnly ))
{
qWarning() << "Error ::"<<fobj.errorString() << endl;
}
DdocObj.setContent(&fobj);
fobj.close();
QDomElement root =DdocObj.documentElement();

if(root.tagName().compare("ClassRoot")==0){
    QDomNodeList CNode1 = root.childNodes();
    for(int i=0;i<CNode1.size();i++){
        QDomElement element = CNode1.item(i).toElement();
        if(element.tagName().compare("Class")==0){
            qDebug()<<"name :"<<element.attribute("name")<<endl;
            DecodeClassElement(element);
        }else{
            qDebug()<<"Tag name does not exist ::"<<element.tagName()<<endl;
        }
    }
}else{
    qWarning() << "Wrong XML" << endl;
}

}

void xmlparsing::DecodeClassElement(QDomElement element)
{
QDomNodeList CNode2 = element.childNodes();
for(int i=0;i<CNode2.length();i++){
QDomElement ele2 = CNode2.at(i).toElement();
qDebug()<<"Element :"<<ele2.tagName()<<endl;
qDebug()<<"name :"<<ele2.attribute("name")<<endl;
qDebug()<<"type :"<<ele2.attribute("type")<<endl;
qDebug()<<"value :"<<ele2.attribute("value")<<endl;
}
}

jsulm

@akshay123 As @yuvaram suggested you should first fix your XML: what you posted is not valid XML. A XML document must have exactly one root node (change Root to what ever you like):

<Root>
<Class name="ABC">
    <LayoutEntry name="ABB"            type="class:ABB"/>
    <LayoutEntry name="ACC"            type="class:ACC"/>
    <LayoutEntry name="ADD"            type="class:ADD"/>
 </Class>

 <Class name="ABB">   //Declared  in class ABC
    <LayoutEntry name="ABB1"            type="class:ABB1"/>
    <LayoutEntry name="ABB2"            type="class:ABB2"/>
  </Class>

  <Class name="ABB1">  //Declared in class ABB
    <LayoutEntry name="ABB1"            value=ABB1"/>
  </Class>

  <Class name="ABB2">
    <LayoutEntry name="ABB2"            value=ABB2"/>
  </Class>
</Root>

yuvaram

Hi @jsulm
I have already mentioned that line to be added root element, please look again. I have added <ClassRoot> tag.

jsulm

@yuvaram I know and I wrote that in my post. I just wanted to add the whole XML document, so it is more clear what we mean.

akshay123

Thanks @yuvaram @jsulm @yuvaram . he XML which i have posted here is not in proper format . Since the XML is very big i wanted to post a small snippet of it . Thanks for your help .