Can't get valid json object

[wabisuke2718]

I tried to parse json and get json object.
But I can't get valid json object.

Code

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QTcpSocket>
#include <QUrl>
#include <QString>

#include <QNetworkAccessManager>

#include <QJsonObject>
#include <QJsonDocument>
#include <QJsonParseError>

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

    /*
    QTcpSocket socket;
    //QUrl url("https://mstdn.jp/api/v1/timelines/public");
    //QString hostName = "mstdn.jp";
    QUrl url("https://teratail.com/questions/73911");
    QString hostName = "teratail.com";
    socket.connectToHost(hostName, 80);
    socket.write("GET " + url.toEncoded(QUrl::RemoveScheme | QUrl::RemoveAuthority) + " HTTP/1.1\r\nHost: " + hostName.toUtf8() + "\r\n\r\n");
    socket.waitForReadyRead(1000000);
    QString data = QString(socket.readAll());
    ui->textEdit->setText(data);
    socket.close();
    */

    manager = new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)),
            this, SLOT(replyFinished(QNetworkReply*)));

    //manager->get(QNetworkRequest(QUrl("http://qt-project.org")));
}

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

void MainWindow::replyFinished(QNetworkReply *reply)
{
    qDebug() << "replyFinished() called.";
    if (reply->error() == QNetworkReply::NoError) {
        QByteArray byteArray = reply->readAll();
        //ui->textEdit->setPlainText(byteArray);   //####if not comment out, json text is showed well.####

        QJsonParseError error;
        QJsonDocument jsonDocument = QJsonDocument::fromJson(byteArray, &error);
        QJsonObject jsonObject = jsonDocument.object();
        qDebug() << error.errorString();

        qDebug() << jsonObject.empty();

        QStringList keys = jsonObject.keys();
        qDebug() << keys;
        foreach (QString key, keys) {
            qDebug() << "key =" << key;
            QString value = jsonObject.value(key).toString();
            qDebug() << "value =" << value;
        }
    }
}

void MainWindow::on_pushButton_clicked()
{
    /*
    QNetworkRequest request(QUrl("https://mstdn.jp/api/v1/timelines/public"));
    request.setRawHeader("Content-Type", "application/x-www-form-urlencoded");
    QByteArray par = "";
    manager->post(request, par);
    */

    manager->get(QNetworkRequest(QUrl("https://mstdn.jp/api/v1/timelines/public")));
    //manager->get(QNetworkRequest(QUrl("http://memotiyou.blogspot.jp/2012/02/qt-c-qnetworkaccessmanager_4306.html")));
}

OUTPUT

replyFinished() called.
"no error occurred"
true
()

[VRonin]

Hint: add

qDebug() << "Is Object? " << jsonDocument.isObject();
qDebug() << "Is Array? " << jsonDocument.isArray();

before QJsonObject jsonObject = jsonDocument.object();

[wabisuke2718]

It went well!
Thank you!

CODE

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QTcpSocket>
#include <QUrl>
#include <QString>

#include <QNetworkAccessManager>

#include <QJsonObject>
#include <QJsonDocument>
#include <QJsonParseError>
#include <QJsonArray>

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

    /*
    QTcpSocket socket;
    //QUrl url("https://mstdn.jp/api/v1/timelines/public");
    //QString hostName = "mstdn.jp";
    QUrl url("https://teratail.com/questions/73911");
    QString hostName = "teratail.com";
    socket.connectToHost(hostName, 80);
    socket.write("GET " + url.toEncoded(QUrl::RemoveScheme | QUrl::RemoveAuthority) + " HTTP/1.1\r\nHost: " + hostName.toUtf8() + "\r\n\r\n");
    socket.waitForReadyRead(1000000);
    QString data = QString(socket.readAll());
    ui->textEdit->setText(data);
    socket.close();
    */

    manager = new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)),
            this, SLOT(replyFinished(QNetworkReply*)));

    //manager->get(QNetworkRequest(QUrl("http://qt-project.org")));
}

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

void MainWindow::replyFinished(QNetworkReply *reply)
{
    qDebug() << "replyFinished() called.";
    if (reply->error() == QNetworkReply::NoError) {
        QByteArray byteArray = reply->readAll();
        //ui->textEdit->setPlainText(byteArray);

        QJsonParseError error;
        QJsonDocument jsonDocument = QJsonDocument::fromJson(byteArray, &error);

        qDebug() << "Is Object? " << jsonDocument.isObject();
        qDebug() << "Is Array? " << jsonDocument.isArray();

        //qDebug() << jsonDocument.;
        QJsonArray jsonArray = jsonDocument.array();
        qDebug() << jsonArray.size();
        QStringList keys = jsonArray[0].toObject().keys();
        qDebug() << keys;
        foreach (QString key, keys) {
            qDebug() << "key =" << key;
            QString value = jsonArray[0].toObject().value(key).toString();
            qDebug() << "value =" << value;
        }

        QJsonObject jsonObject = jsonDocument.object();
        qDebug() << error.errorString();

        //qDebug() << jsonObject.empty();

        /*
        QStringList keys = jsonObject.keys();
        qDebug() << keys;
        foreach (QString key, keys) {
            qDebug() << "key =" << key;
            QString value = jsonObject.value(key).toString();
            qDebug() << "value =" << value;
        }
        */
    }
}

void MainWindow::on_pushButton_clicked()
{
    /*
    QNetworkRequest request(QUrl("https://mstdn.jp/api/v1/timelines/public"));
    request.setRawHeader("Content-Type", "application/x-www-form-urlencoded");
    QByteArray par = "";
    manager->post(request, par);
    */

    manager->get(QNetworkRequest(QUrl("https://mstdn.jp/api/v1/timelines/public")));
    //manager->get(QNetworkRequest(QUrl("http://memotiyou.blogspot.jp/2012/02/qt-c-qnetworkaccessmanager_4306.html")));
}