main.cpp

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// ======================================================================
//  main.cpp
// ======================================================================
//                   This file is a part of the book 
//             "Qt 5.10 Professional programming with C++"
//                       http://qt-book.com
// ======================================================================
//  Copyright (c) 2017 by Max Schlee
// ======================================================================

#include <QtXml>

// ----------------------------------------------------------------------
QDomElement makeElement(      QDomDocument& domDoc, 
                        const QString&      strName,
                        const QString&      strAttr = QString::null,
                        const QString&      strText = QString::null
                       )
{
    QDomElement domElement = domDoc.createElement(strName);

    if (!strAttr.isEmpty()) {
        QDomAttr domAttr = domDoc.createAttribute("number");
        domAttr.setValue(strAttr);
        domElement.setAttributeNode(domAttr);
    }

    if (!strText.isEmpty()) {
        QDomText domText = domDoc.createTextNode(strText);
        domElement.appendChild(domText);
    }
    return domElement;
} 

// ----------------------------------------------------------------------
QDomElement contact(      QDomDocument& domDoc, 
                    const QString&      strName, 
                    const QString&      strPhone,
                    const QString&      strEmail
                   )
{
    static int nNumber = 1;

    QDomElement domElement = makeElement(domDoc, 
                                         "contact", 
                                         QString().setNum(nNumber)
                                        );
    domElement.appendChild(makeElement(domDoc, "name", "", strName));
    domElement.appendChild(makeElement(domDoc, "phone", "", strPhone));
    domElement.appendChild(makeElement(domDoc, "email", "", strEmail));

    nNumber++;

    return domElement;
}

// ----------------------------------------------------------------------
int main()
{
    QDomDocument doc("addressbook");
    QDomElement  domElement = doc.createElement("addressbook");
    doc.appendChild(domElement);

    QDomElement contact1 = 
        contact(doc, "Piggy", "+49 631322187", "piggy@mega.de");

    QDomElement contact2 = 
        contact(doc, "Kermit", "+49 631322181", "kermit@mega.de");

    QDomElement contact3 = 
        contact(doc, "Gonzo", "+49 631322186", "gonzo@mega.de");

    domElement.appendChild(contact1);
    domElement.appendChild(contact2);
    domElement.appendChild(contact3);

    QFile file("addressbook.xml");
    if(file.open(QIODevice::WriteOnly)) {
        QTextStream(&file) << doc.toString();
        file.close();
    }
    return 0;
}