Qlist returns Size as -1

Mathan M

Hi,

I am writing the list of portalsearchitems in an xml file. I can extract the info like Title,Owner but the Size returns -1. I need size for computing the space available.

Code Snippet:
main.qml

  for (var ii = 0; ii <= varidPortalSearchItemsCount -1 ;ii++)
                {
                    vartextJson += '{"title":"'+ idPortalSearchItems.results[ii].title +'"
                                    ,"owner":"'+ idPortalSearchItems.results[ii].owner +'"

                                    ,"size":"'+ idPortalSearchItems.results[ii].size +'"  //Size is just shown as -1


                                    }' + ',';
                }

Thanks In advance.

JohanSolo

@Mathan-M said in Qlist returns Size as -1:

  for (var ii = 0; ii <= varidPortalSearchItemsCount -1 ;ii++)

This looks odd to me: why don't you use

for ( var ii = 0; ii < varidPortalSearchItemsCount ; ++ii )

Mathan M

ok.

I am accessing the value of Object.

idPortalSearchItems.results[ii].size

In the object, just it store only -1 value.

mrjj

Hi
should it not be

idPortalSearchItems.results[ii].size() +

as its a function call?

Also, QList cannot return -1 as far as i know.
it returns 0 for empty list.

? Offline

Hi!
I was curious if this might be some JavaScript side effect with "size" being some predefined property or something like that. So, I've build a minimal example and no, no problems, works as expected for me. Can you verify that?

dataobject.h

#ifndef DATAOBJECT_H
#define DATAOBJECT_H

#include <QObject>
#include <QString>


class DataObject : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString title READ title WRITE setTitle NOTIFY titleChanged)
    Q_PROPERTY(int size READ size WRITE setSize NOTIFY sizeChanged)
public:
    explicit DataObject(const QString &t = QString(), int s = 0, QObject *parent = 0);
    QString title() const { return m_title; }
    void setTitle(const QString &t) {
        if (t == m_title)
            return;
        m_title = t;
        emit titleChanged(t);
    }
    int size() const { return m_size; }
    void setSize(int s) {
        if (s == m_size)
            return;
        m_size = s;
        emit sizeChanged(s);
    }

signals:
    void titleChanged(QString);
    void sizeChanged(int);
private:
    QString m_title;
    int m_size;
};

#endif // DATAOBJECT_H

dataobject.cpp

#include "dataobject.h"

DataObject::DataObject(const QString &t, int s, QObject *parent)
    : QObject(parent)
    , m_title(t)
    , m_size(s)
{
}

main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QList>
#include <QObject>
#include <QQmlContext>

#include "dataobject.h"

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QGuiApplication app(argc, argv);

    QList<QObject*> dataList;
    dataList << new DataObject("Cheyenne", 23);
    dataList << new DataObject("Greeneville", 42);
    dataList << new DataObject("Columbia", 666);

    QQmlApplicationEngine engine;
    engine.rootContext()->setContextProperty("dataModel", QVariant::fromValue(dataList));
    engine.load(QUrl(QLatin1String("qrc:/main.qml")));

    return app.exec();
}

main.qml

import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.0

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

    Text {
        id: txt
        anchors.fill: parent
    }
    Button {
        id: btn
        text: "Click me"
        anchors.bottom: parent.bottom
        anchors.left: parent.left
        onClicked: {
            for (var i=0; i<dataModel.length; ++i)
                txt.text += dataModel[i].title + " / " + dataModel[i].size + "\n";
        }
    }
}

p3c0

@Mathan-M You should also post other relevant information like what is results ? What does it return ?

Mathan M

Hi p3c0,

The results will back the portalItems information. If the portal consits of document, It will brings the type,name,owner,size and other relevant information and same applies to map like map type,name,owner,size. The object returns from the portal is perfect except the field Size. It just returning -1. I assume, the problem is not with server.

Thanks In advance.

p3c0

@Mathan-M What is document ? What is its datatype ? What are type,name,owner,size in that document ? Is it a C++ or Javascript object ?

? Offline

Is result of type QList<QObject*>?

Mathan M

yes, the return type will be Qlist

? Offline

@Mathan-M Ok, then have a look at my code above; that works as expected, what's different to your code?

Qlist returns Size as -1

Code Snippet: main.qml

Code Snippet:
main.qml