QString::toInt() fails when converting a QString from another class - c++

Question

I want to convert a QString from another class toInt, but it seams to fail because the result is 0 while it should be 5 and the rest of the code works.
Because I am new to C/Qt and find classes a bit confusing, I think I have done something wrong with my classes.
widget.cpp
#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent) :
QWidget(parent),
ui(new Ui::Widget)
{
ui->setupUi(this);
}
Widget::~Widget()
{
delete ui;
}
void Widget::on_pushButton_clicked()
{
MyClass tmp;
int myNumber = tmp.m_replyStr.toInt();
ui->lcdNumber->display(myNumber);
}
MyClass::MyClass()
{
m_manager = new QNetworkAccessManager(this);
connect( m_manager, SIGNAL(finished(QNetworkReply*)),
this, SLOT(replyFinished(QNetworkReply*)));
}
void MyClass::fetch()
{
m_manager->get(QNetworkRequest(QUrl("http://example.tld/test.html"))); // html contains only the number 5
}
void MyClass::replyFinished(QNetworkReply* pReply)
{
QByteArray data=pReply->readAll();
QString str(data);
m_replyStr = str;
}
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QObject>
#include <QNetworkAccessManager>
#include <QUrl>
#include <QNetworkRequest>
#include <QNetworkReply>
namespace Ui {
class Widget;
}
class Widget : public QWidget
{
Q_OBJECT
public:
explicit Widget(QWidget *parent = 0);
~Widget();
private slots:
void on_pushButton_clicked();
private:
Ui::Widget *ui;
};
class MyClass : public QObject
{
Q_OBJECT
public:
MyClass();
void fetch();
QString m_replyStr;
public slots:
void replyFinished(QNetworkReply*);
private:
QNetworkAccessManager* m_manager;
};
#endif // WIDGET_H

Answer 1

You're accessing m_replyStr of a newly initialised instance tmp, which doesn't set anything into its m_replyStr. So it has the default-initialised value of "empty string."
EDIT
Based on your follow-up question, perhaps you were looking for something like this?
class MyClass;
class Widget : public QWidget
{
Q_OBJECT
public:
Widget(MyClass &myClassInstance, QWidget *parent = 0);
~Widget();
private slots:
void on_pushButton_clicked();
private:
Ui::Widget *ui;
MyClass *myClass;
};
Widget::Widget(MyClass &myClassInstance, QWidget *parent = 0)
: QWidget(parent)
, ui(new Ui::Widget)
, myClass(&myClassInstance)
{
ui->setupUi(this);
}
void Widget::on_pushButton_clicked()
{
int myNumber = myClass->m_replyStr.toInt();
ui->lcdNumber->display(myNumber);
}