File IO

fileio.cpp

#include "fileio.h"
#include <QFile>
#include <QTextStream>

FileIO::FileIO()
{

}

void FileIO::save(QString text){
    QFile file("text.txt");

    if(file.open(QIODevice::ReadWrite)){
    QTextStream stream(&file);
    stream << text << endl;
    }

    return;

}

FileIO::~FileIO()
{

}

fileio.h

#include <QObject>

#ifndef FILEIO_H
#define FILEIO_H


class FileIO : public QObject
{

    Q_OBJECT

public:
    FileIO();
    Q_INVOKABLE void save(QString text);
    ~FileIO();

};

#endif // FILEIO_H

main.cpp

#include <QApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include "fileio.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    engine.rootContext()->setContextProperty("FileIO", new FileIO());

    return app.exec();
}

main.qml

import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Window 2.2
import QtQuick.Dialogs 1.2

ApplicationWindow {
    title: qsTr("Hello World")
    width: 640
    height: 480
    visible: true

    TextArea {
        id: saveMe
        x: 200
        y: 84
    }

    Button {
        id: button1
        x: 283
        y: 266
        text: qsTr("Save")
        onClicked: FileIO.save(saveMe.text);
    }


}