How to read a xml file in qt?

[Gokulnathvc]

Help me in giving a sample or simple application on how to read the contents of the xml file in QT
?

[wysota]

int main() {
  QFile file("file.xml");
  file.open(QIODevice::ReadOnly|QIODevice::Text);
  QDomDocument doc;
  doc.setContent(&file);
  return 0;
}

int main() {
  QFile file("file.xml");
  file.open(QIODevice::ReadOnly|QIODevice::Text);
  QDomDocument doc;
  doc.setContent(&file);
  return 0;
}

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[Gokulnathvc]

It says QDomDocument has incomplete type name.

[wysota]

Too bad. After writing over 200 posts you should know how to include header files and enable Qt modules.

[Gokulnathvc]

I have added header file and class. still it says this error

[Zlatomir]

Also include the QDomNode and QDomElement (not sure if this is the issue, but you will probably use that classes) and don't forget to add QT += xml in the .pro file (then rebuild).

[Gokulnathvc]

The following code works fine.

QFile* file = new QFile("C:\\persons.xml");
        QFile txtfile("xmldata.txt");
 
        /* If we can't open it, let's show an error message. */
        if (!file->open(QIODevice::ReadOnly | QIODevice::Text)) {
                QMessageBox::critical(this,
                                      "QXSRExample::parseXML",
                                      "Couldn't open example.xml",
                                      QMessageBox::Ok);
                return;
        }
        /* QXmlStreamReader takes any QIODevice. */
        QXmlStreamReader xml(file);
        while (!xml.atEnd() && !xml.hasError())
        {
            xml.readNext();
            if (xml.isStartElement())
            {
                QString name = xml.name().toString();
                if (name == "firstname" || name == "surname" ||
                    name == "email" || name == "website")
                {
                    txtfile.open(QIODevice::WriteOnly | QIODevice::Text);
                    txtfile.write("Element Name:");
                    txtfile.write("\r\n");
                    txtfile.write(name.toStdString().c_str());
                    txtfile.write("\r\n");
                    txtfile.write("Text:");
                    txtfile.write("\r\n");
                    txtfile.write(xml.readElementText().toStdString().c_str());
                    txtfile.write("\r\n");
                }
            }
        }
        if (xml.hasError())
        {
            QMessageBox::warning(NULL,"Error",xml.errorString(),QMessageBox::Ok);
        }
        else if (xml.atEnd())
        {
           QMessageBox::warning(NULL,"End","Reached End!!!",QMessageBox::Ok);
        }
 
    txtfile.close();
    file->close();

QFile* file = new QFile("C:\\persons.xml");
        QFile txtfile("xmldata.txt");

        /* If we can't open it, let's show an error message. */
        if (!file->open(QIODevice::ReadOnly | QIODevice::Text)) {
                QMessageBox::critical(this,
                                      "QXSRExample::parseXML",
                                      "Couldn't open example.xml",
                                      QMessageBox::Ok);
                return;
        }
        /* QXmlStreamReader takes any QIODevice. */
        QXmlStreamReader xml(file);
        while (!xml.atEnd() && !xml.hasError())
        {
            xml.readNext();
            if (xml.isStartElement())
            {
                QString name = xml.name().toString();
                if (name == "firstname" || name == "surname" ||
                    name == "email" || name == "website")
                {
                    txtfile.open(QIODevice::WriteOnly | QIODevice::Text);
                    txtfile.write("Element Name:");
                    txtfile.write("\r\n");
                    txtfile.write(name.toStdString().c_str());
                    txtfile.write("\r\n");
                    txtfile.write("Text:");
                    txtfile.write("\r\n");
                    txtfile.write(xml.readElementText().toStdString().c_str());
                    txtfile.write("\r\n");
                }
            }
        }
        if (xml.hasError())
        {
            QMessageBox::warning(NULL,"Error",xml.errorString(),QMessageBox::Ok);
        }
        else if (xml.atEnd())
        {
           QMessageBox::warning(NULL,"End","Reached End!!!",QMessageBox::Ok);
        }

    txtfile.close();
    file->close();

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XML file is

<?xml version="1.0" encoding="iso-8859-1" ?>
<persons>
<person>
<firstname>John</firstname>
<surname>Doe</surname>
<email>john.doe@example.com</email>
<website>http://en.wikipedia.org/wiki/John_Doe</website>
</person>
<person>
<firstname>Jane</firstname>
<surname>Doe</surname>
<email>jane.doe@example.com</email>
<website>http://en.wikipedia.org/wiki/John_Doe</website>
</person>
<person>
<firstname>Matti</firstname>
<surname>Meikäläinen</surname>
<email>matti.meikalainen@example.com</email>
<website>http://fi.wikipedia.org/wiki/Matti_Meikäläinen</website>
</person>
</persons>