Read JSON with QJsonObject

Question

I'm writing a couple test functions as it's my first time with Qt and trying to understand the bits I need to develop my end project. Here are the functions:

#include "money.h"
#include "ui_money.h"
#include <QNetworkAccessManager>
#include <QUrl>
#include <QNetworkRequest>
#include <QString>
#include <QJsonArray>
#include <QJsonDocument>



Money::Money(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Money)
{
    ui->setupUi(this);
}

Money::~Money()
{
    delete ui;
}

void Money::on_getJsonData_clicked()
{
    QNetworkAccessManager *manager = new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)),
            this, SLOT(replyFinished(QNetworkReply*)));

    manager->get(QNetworkRequest(QUrl("http://scarjamoney.no-ip.biz")));


}

void Money::replyFinished(QNetworkReply* Reply)
{
    QString string = Reply->readAll();
    QJsonDocument document = QJsonDocument::fromJson(string.toUtf8());

    if(document.isArray()){
        QJsonArray valuesA = document.array();

        foreach (const QJsonValue write, valuesA){
            //ui->textEdit->setText("dentro");
            QString text = QString::number(write.toDouble());

            //qDebug() << "ciao" << text;

            ui->textEdit->append(text);
        }
    }
    else if(document.isObject()){
        QJsonObject valuesO = document.object();
        foreach (const QJsonValue write, valuesO){
            ui->textEdit->append("inside");
        }

        ui->textEdit->append("it's an object");
    }

}

In case of a test json reply in array form eg:

[1,2]

everything works, instead in a test for objects like:

{"firstValue":1,"secondValue":2}

I get the following error compiling:

C:\Qt\Tools\QtCreator\bin\Money\money.cpp:53: error: variable 'QJsonObject valuesO' has initializer but incomplete type
     QJsonObject valuesO = document.object();
C:\Qt\Tools\QtCreator\bin\Money\money.cpp:53: error: invalid use of incomplete type 'class QJsonObject'
     QJsonObject valuesO = document.object();

Why won't it convert my test json document into an object?

Thanks in advance, James

Arpegius · Accepted Answer · 2014-04-17 09:09:27Z

18

You forget to include QJsonObject:

#include <QJsonDocument>
#include <QJsonValue>
#include <QJsonArray>
#include <QJsonObject>

answered Apr 17, 2014 at 9:09

Arpegius

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1 Comment

James Over a year ago

ahhh.... sometimes so simple... could kick myself, spent about an hour looking at it aswell!! Thanks

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