Unable to connect websockets using QT

[gully]

Hi,

I have gone through the code from the following link http://doc.qt.io/qt-5/qtwebsockets-examples.html .Took the same and put it in my code. However I am not able to connect to my websocket. The websocket is not opening on click of the button

//websocketimpl.h
#ifndef WEBSOCKETCLIENTIMPL_H
#define WEBSOCKETCLIENTIMPL_H
#include <QtCore/QObject>
#include <QtWebSockets/QWebSocket>


class websocketclientimpl : public QObject
{
    Q_OBJECT
public:
    explicit websocketclientimpl(const QUrl &url, QObject *parent = Q_NULLPTR);

Q_SIGNALS:
    void closed();

private Q_SLOTS:
    void onConnected();
    void onTextMessageReceived(QString message);

private:
    QWebSocket m_webSocket;
    QUrl m_url;
    bool m_debug;
};

#endif // WEBSOCKETCLIENTIMPL_H

#include "websocketclientimpl.h"
#include <QtCore/QDebug>
#include <QJsonObject>
#include <QJsonDocument>
#include <qbytearray.h>
QT_USE_NAMESPACE

websocketclientimpl::websocketclientimpl(const QUrl &url,QObject *parent) :
    QObject(parent),
    m_url(url)

{
    //if (m_debug)
        qDebug() << "WebSocket server:" << url;
    connect(&m_webSocket, &QWebSocket::connected, this, &websocketclientimpl::onConnected);
    connect(&m_webSocket, &QWebSocket::disconnected, this, &websocketclientimpl::closed);
    m_webSocket.open(QUrl(url));
}

void websocketclientimpl::onConnected()
{

        qDebug() << "WebSocket connected";
    connect(&m_webSocket, &QWebSocket::textMessageReceived,
            this, &websocketclientimpl::onTextMessageReceived);
    QJsonObject subscriptionObject;
    subscriptionObject.insert("subchannel","1234");
    QJsonDocument doc(subscriptionObject);
    QByteArray ba = doc.toJson();

    m_webSocket.sendTextMessage(QString(ba));
}

void websocketclientimpl::onTextMessageReceived(QString message)
{

        qDebug() << "Message received:" << message;
    //m_webSocket.close();
}

#ifndef WEBSOCKETOPERATIONS_H
#define WEBSOCKETOPERATIONS_H
#include<QtCore>

class websocketoperations
{
public:
    websocketoperations();
    void createWebsocketConnection();

};

#endif // WEBSOCKETOPERATIONS_H

#include "websocketoperations.h"
#include "websocketclientimpl.h"
#include <QDebug>

websocketoperations::websocketoperations()
{

}
void websocketoperations::createWebsocketConnection()
{
    websocketclientimpl client(QUrl(QStringLiteral("ws://localhost:8910/zoutboundws")));

}

#include "livechart.h"
#include "ui_livechart.h"
#include "websocketoperations.h"

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

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

void livechart::on_buttonStartWebsocketConnection_clicked()
{
    websocketoperations wsOperationsObj;
    wsOperationsObj.createWebsocketConnection();

}

void livechart::on_stopWebsocketConnection_clicked()
{

}

Can anyone help me,where I am going wrong.

[jsulm]

@gully You declare local variables which are destroyed when the method finishes:

void websocketoperations::createWebsocketConnection()
{
    websocketclientimpl client(QUrl(QStringLiteral("ws://localhost:8910/zoutboundws"))); // local variable!

}

void livechart::on_buttonStartWebsocketConnection_clicked()
{
    websocketoperations wsOperationsObj; // local variable
    wsOperationsObj.createWebsocketConnection();

}

[gully]

@jsulm What would be the solution then ?Do I need to wait forever in a infinite loop? I am pretty newbie in C++

[jsulm]

@gully Declare those variables as class members:

class livechart
{
...
private:
    websocketoperations wsOperationsObj
}

If you're C++ newbie then I would suggest to take time to learn C++, else it could be hard to use Qt.

[gully]

@jsulm Thanks a lot..it worked.. I would also try to add a pull request to the qt code...the example itself created the confusion.

[mrjj]

@gully
Hi
Can you show what example?