Using value given in first window in third window but first window opens the second window?

RootLearner

I have this as my mainwindow.h

#include "mainwindow.h"
#include<mainwindow.h>
#include "ui_mainwindow.h"

#include <QObject>

#include <QMessageBox>

#include <QProcess>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
//    lists::username = "hahah";

}

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

void MainWindow::on_pushButton_Search_clicked()
{
    QString movie = ui->movie_name->text();
    List = new lists(this);
    hide();
    List->show();
    int p = 10;

    qDebug()<<"emitted";
    //This slot gets executed and it's effect is not remained for later!!
    connect(this, SIGNAL(send_d(QString)), Third, SLOT(receive(QString)));
    emit send_d(movie);
    
    //
    connect(this, SIGNAL(send(QString,int)), List, SLOT(get_movie(QString,int)));
    emit send(movie, p);

}

I have second window as follows:

#include "lists.h"
#include "ui_lists.h"

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

}

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

void lists::get_movie(QString m, int d)
{
    a = m;
    ui->label->setText(a);
    num1 = d;
}


void lists::on_pushButton_clicked()
{
    
    qDebug()<<"hello";
    int num = 1;
    if (num==1)
    {
        Thi = new third(this);
        hide();
        Thi->show();
    }

}

After the pushbutton is clicked, third window is displayed. But I want to use the QString movie given in first window in the third window. My third.cpp is as follows:

#include "third.h"
#include "ui_third.h"

third::third(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::third)
{
    ui->setupUi(this);
    ui->label->setText(temp);//this label needs to show the movie entered in the mainwindow. 
}

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

void third::receive(QString a)
{
    temp = a;//I need movie entered in the first window
}

Using signals and slots like this, the effect does not last when I reach third window from second window. I know I can connect another signal from second window to the third window, but in my actual project, the signals are complex. So, I want to be able to solve in a simple program like this.
How do I get the QString 'movie' from first window to be shown in label of third.cpp without using 'connect' in second window?
As slots get executed immediately, I think I won't get the required text in label of third.ui? How do I approach this?
Thank you in advance!

SGaist

Hi,

What exactly is the goal of your GUI ?

From the looks of it might be some sort of wizard.

Fabien-B

Hi,
What do you mean by "the effect does not last" ? Does the slot ever get called ?
I see that you create List before connecting the signal. Is Third initialized at the time of connecting the signal ?
I don't see why it would works with List but not with Third...