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&#40;&#41; {
    QFile file("h:/test.txt"&#41;;
    if (!file.open(QFile::ReadOnly | QFile::Text&#41;&#41; 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(&#41;
}

Button {
    name: "Write file"
    anchors.right: parent.right
    anchors.bottom: parent.bottom
    onClicked: helper.writeFile(myText.text&#41;
}

}@

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?