Read tags from a xml string

Helson

Hello, all right?

I have the string below on a QString.

qDebug() << data;
"<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><ns2:listarAlgo xmlns:ns2="http://soap.myws.com.br/"><return><codigo>1111</codigo><dataNascimento>1999-01-01</dataNascimento><email>my@email.com</email><nome>MyName</nome><sexo>F</sexo><grauInstrucao/><identificador>349</identificador><usuario><codigo>111</codigo><email>my@email.com</email><login>MyLogin</login><nome>MyName</nome><senha>Seinha</senha></usuario></return></ns2:listarAlgo></soap:Body></soap:Envelope>"

And I need get the text value of tags into "<return></return>"

QString data = ... string above
QXmlStreamReader xml(data);
	while(!xml.atEnd()){	
				qDebug() << xml.name();
				qDebug() << xml.readElementText();	
				xml.readNext();		
	}

But this code not iterate over all elements.
It prints only:

"" 
"" 
"Envelope"

then exit of while loop.

also tried otherwise with "xml.readNextStartElement();" outside while loop, and he return "Body" and exit while loop...
Is there any way I can iterate over all the elements?

My best regards!

SGaist

Hi,

You have the XBEL example that you can take inspiration from.

Hope it helps

Helson

SGaist, with that example I checked that an error stops the while loop:

QXmlStreamReader::UnexpectedElementError

Current code:

	while(!xml.atEnd()){		
		qDebug() << xml.name();
		qDebug() << xml.readElementText();	
		xml.readNext();
		if (xml.hasError()) {
			qDebug() << xml.error();  //Return 1 = QXmlStreamReader::UnexpectedElementError			
                }
	}

The xml to be parsed:

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<ns2:listarAlgo xmlns:ns2="http://soap.myws.com.br/">
	<return>
		<codigo>1111</codigo>
		<dataNascimento>1999-01-01</dataNascimento>
		<email>my@email.com</email>
		<nome>MyName</nome>
		<sexo>F</sexo>
		<grauInstrucao/>
		<identificador>349</identificador>
		<usuario><codigo>111</codigo>
		<email>my@email.com</email>
		<login>MyLogin</login>
		<nome>MyName</nome>
		<senha>Seinha</senha>
		</usuario>
	</return>
</ns2:listarAlgo>
</soap:Body>
</soap:Envelope>

Output console: 
"" 
"" 
"Envelope" 
1

Bagavathi

Find the required tag (in your case <return> tag).
Process the data.

    while(xml.tokenType() != QXmlStreamReader::EndDocument) {
        if(xml.tokenType() == QXmlStreamReader::StartElement &&
                (xml.name().compare("return", Qt::CaseInsensitive)==0)) {
                // ------------- todo ---------------------
                // Process the data
       }
       xml.readNext();
    }

Helson

@Bagavathi

You code works so fine!
How can I get all tags inside <return> and get childs of <usuario></usuario> ?

<return>   <<<<<<<<<<<<<<
      <codigo>1111</codigo>
      <dataNascimento>1999-01-01</dataNascimento>
      <email>my@email.com</email>
      <nome>MyName</nome>
      <sexo>F</sexo>
      <grauInstrucao/>
      <identificador>349</identificador>
      <usuario>  < <<<<<<<<<<<<<<<<
           <codigo>111</codigo>
               <email>my@email.com</email>
              <login>MyLogin</login>
              <nome>MyName</nome>
              <senha>Seinha</senha>
     </usuario>
  </return>

My best regards!

Bagavathi

@Helson

Please refer the below Article, this may help you lot.

Qt5 Tutorial QtXML DOM Reading - 2015

Helson

Thank you, my first question is solved.

My second is: how can I get all child of <return><return>?

SGaist

You have to get down five level deep:

Envelope
Body
listarAlgo
return
usuario

The easiest way is to make a function that parses each element and call it once you found it. Again the Bookmark example shows that nicely.