Save and load txt file

[jjocram]

Hi, I'm writing a simple program with Qt 5.0 and I'd be interested, via a button, to save the written text of a text in a .Txt file in the same folder where there are all the program files.
Then, again using a button, I'd be interested to open a file manager window and choose here another text file which is opened in the text.
Sorry for the various repetition of the word text; cordial greetings.
This is the code:
@import QtQuick 2.0
import Ubuntu.Components 0.1
Rectangle {
width: 300
height: 300
color: "lightgray"

    TextArea {
            id:testo
            width: units.gu(37)
            height: units.gu(6)
            contentWidth: units.gu(30)
            contentHeight: units.gu(60)
            activeFocusOnPress : true

           }
     Column{
       anchors.centerIn: parent
       spacing: parent.width/6

       Button{
           id: exitButton
           text: "load"


             }
       Button{
           id:savebutton
           text:"save"
           onClicked:???????
             }
            }
        }@

[utcenter]

Just create a QObject derived class, add a read and write slot and implement using QFile, register the class to QML, instantiate it in QML and connect it to the signals of your buttons.

[jjocram]

Thanks for your reply can you give me an example, please

[Jens]

There is a pretty simple example here:

http://www.developer.nokia.com/Community/Wiki/Reading_and_writing_files_in_QML

It is Qt Quick 1 though so it will require a bit of adaptation.

[utcenter]

Here is a quick and basic example for QtQuick2 - paths are hardcoded, since it is just an example:

The FileHelper custom QML element:

@class FileHelper : public QObject {
Q_OBJECT
public:
explicit FileHelper(QObject *parent = 0) : QObject(parent) {}

public slots:
void writeFile(const QString &text) {
QFile file("h:/test.txt");
if (!file.open(QFile::WriteOnly | QFile::Text)) return;
QTextStream out(&file);
out << text;
file.close();
}

QString readFile() {
    QFile file("h:/test.txt");
    if (!file.open(QFile::ReadOnly | QFile::Text)) return "";
    QTextStream in(&file);
    QString temp = in.readAll();
    file.close();
    return temp;
}    

};@

Register the element to the engine in main.cpp:

@#include <QtQuick>

int main(int argc, char *argv[]) {
...
qmlRegisterType<FileHelper>("FileHelpers", 1, 0, "FileHelper");
...
}@

And last - the QML:

@import QtQuick 2.0
import FileHelpers 1.0

Rectangle {
width: 360
height: 360

FileHelper {
    id: helper
}

TextEdit {
    id: myText
    anchors.fill: parent
    text: "test"
}

Button {
    name: "Read file"
    anchors.left: parent.left
    anchors.bottom: parent.bottom
    onClicked: myText.text = helper.readFile()
}

Button {
    name: "Write file"
    anchors.right: parent.right
    anchors.bottom: parent.bottom
    onClicked: helper.writeFile(myText.text)
}

}@

[jjocram]

Thank you very much for the answer.
When i start my program the terminal gives me this error:
@2 module "FileHelpers" is not installed@

How can I fix?

[utcenter]

Did you register the class, i.e. the second step of my example?