Writing Subchild with DOM

[Aashu10]

I already have an XML file, I need to write under a Header, Below i have show a my XML file.

<MAIN_HEADER>
  
  <HEADER1>
  //it's child
  </HEADER1>

  <HEADER2>
  //it's child>
  </HEADER2>

  <HEADER3>
  //EMPTY
  </HEADER3>
  
  <HEADER4>
  //it's child
  </HEADER4>

</MAIN_HEADER>
  

I need to write child and subchild inside HEADER3 . Below is my code.

QFile file(output);
    if(!file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        qDebug()<<"file doesnt exists";
    }
    QDomDocument domDocument;
    if( !domDocument.setContent( &file ) )
    {
        qDebug()<<"Error";

        return;
    }

    QDomElement topElement = domDocument.documentElement();
    QDomNode domNode = topElement.firstChild();
    while(!domNode.isNull())
    {
                    QDomElement domElement = domNode.toElement();
                    if(!domElement.isNull())
                    {

        if(domElement.tagName() == "HEADER3")
        {
            for(int i=0; i<List.count();i++)
            {
                QDomElement node = domDocument.createElement("CHILD");
                node.setAttribute("Name", List[i].Filename);
                node.setAttribute("Value", List[i].value);
                domElement.appendChild(node);
                if(List[i].subChild.size() != 0)
                {
                    QDomElement subNode =   domDocument.createElement("SubChild");
                    subNode.setAttribute("Name", List[i].SubChild);
                    node.appendChild(subNode);
                }
            }
        }


                }
domNode = domNode.nextSibling();
            }
    file.close();

    QFile outfile( output);
    if( !outfile.open( QIODevice::WriteOnly | QIODevice::Text ) )
    {
        qDebug()<<"Error";
    }

    QTextStream stream1( &outfile );
    stream1 << dom.toString();
    outfile.close();

This code gets stuck inside while loop, I'm not so sure about the hierarchy in this code. I just want to write the contents in <HEADER3>

[JohanSolo]

@Aashu10 said:

My code get's stuck when i compile it. I am very new to DOM Parser.

Please elaborate what you mean? Getting stuck when compiling? What is the error?

[Aashu10]

No error, It's just stuck, When i debuged it. I found it's stuck in the while loop.

[JohanSolo]

@Aashu10 said:

No error, It's just stuck, When i debuged it. I found it's stuck in the while loop.

OK, so the code compiles.

I think you never go to the next node... it just reads forever and ever the first node of you document.

[Aashu10]

Any suggestion how to bypass this?

[JohanSolo]

Well, at some point you must read you document, i.e. go from one node to the other. At the end of the loop you should do something like domNode = domeNode.nextSibling(). If you don't do so, you're endlessly reading the first node of your document, as I've told you before.

[Aashu10]

Ah! Thank you! @JohanSolo Now it goes through the loop properly, but the contents of the header is still empty. I just debugged, found out it never goes into

if(domElement.text() == "HEADER3")

I am not sure about hierarchy in the code. but the hierarchy in my XML file is as shown in this XML file

@JohanSolo I have edited the code accordingly

[JohanSolo]

@Aashu10 said:

if(domElement.text() == "HEADER3")

I am not sure about hierarchy in the code. but the hierarchy in my XML file is as shown in this XML file

Use tagName(), text() returns the text contained in a tag.

[Aashu10]

Yes! @JohanSolo Now it goes inside the loop, but does not write the contents inside HEADER3. This time i have no idea why. I have updated the code. Please do take a look.

[JohanSolo]

I don't see any obvious mistake. Note that I've never used QDomDocument to write a file. It's such a waste of memory according to me...

Edit: you should get a look at the returned value of appendChild to check that everything went fine.

[Aashu10]

Thanks for replying, How do i check the return value of that. Sorry not so proficient with DomDocument.

[JohanSolo]

@Aashu10 said:

Thanks for replying, How do i check the return value of that. Sorry not so proficient with DomDocument.

Have a look at the doc