jump to another condition from for loop in qt creator

[Mijaz]

my code is follows:

void first_page::Self_test()
{
   for(int value =0; value<=120; value++)

    {

   QObject::connect(ui->power_off, SIGNAL(clicked()), this, SLOT(on_power_off_clicked()));

        QThread::msleep(200);
        ui->progressBar->setValue(value);

        if(value <= 20)
        {
            ui->OS_status->setText("loading...");
           if(value ==20)
           {
                ui->OS_check->setStyleSheet("border-image: url(:/images/tick4.png)");
                ui->OS_status->setText("successful");
           }
        }

        if(value >20 && value<=40)
        {
            ui->HW_status->setText("loading...");
            if (value ==40)
            {
                ui->HW_check->setStyleSheet("border-image: url(:/images/tick4.png)");
                ui->HW_status->setText("successful");
            }

        }
        if(value >40 && value <= 60)
        {
            ui->Mem_status->setText("loading...");
            if (value ==60)
            {
             ui->Mem_check->setStyleSheet("border-image: url(:/images/tick4.png)");
             ui->Mem_status->setText("successful");
            }

        }
        if(value >60 && value<=80)
        {
            ui->CS_status->setText("loading...");
            if (value ==80)
            {
            ui->CS_check->setStyleSheet("border-image: url(:/images/tick4.png)");
            ui->CS_status->setText("successful");
            }
        }
        if(value >80 && value<=100)
        {
            ui->PM_status->setText("loading...");
            if (value ==100)
            {
            ui->PM_check->setStyleSheet("border-image: url(:/images/tick4.png)");
            ui->PM_status->setText("successful");
            }

        }
        if(value>100)
        {
            qDebug() << "wait";

        }

    }

    this->hide();
    second_page my_secondpage;
    my_secondpage.setModal(true);
    my_secondpage.exec();
    qDebug() << "jump to second page";
}

void first_page::on_power_off_clicked()
{
    system("shutdown -P now");
    qDebug() << "power_off pressed";
}
...................... 
my queries:
I have a button when it press the system should shutdown but above code not working as I want, even I have connect the on_power_off_clicked(). 
Please any can help?

[JonB]

@Mijaz

• You connect the same signal to the same slot 121 times. This is not a good idea.
• What are you using msleep() for?
• You set same stylesheet and text on same objects somewhere around 100 times. This is not a good idea.
• Your secondpage is a local variable, I don't know what "jump to second page" means to you.
• The title of your thread is "jump to another condition from for loop in qt creator". What does "jump to another condition from for loop" mean?
• Qt Creator is an IDE. It has nothing to do with whether you can do this sort of thing. That is just a C++ question.
• You do not say whether you see power_off pressed message or not. If you want help don't you think you ought to tell us whether it's hot or not?
• You do not check the result from system("shutdown -P now"); so nobody knows whether it works or not.
• Why 100 lines of code? Why loops? Just test whether your command works on a 10 line standalone program. Loops are irrelevant.

[TomZ]

@Mijaz start here;

https://www.learnqt.guide/events/working-with-events/

[Mijaz]

@JonB
First of all thank you for your comment.
Basically I want to design a spectrum analyzer UI on QT creator.
This is initial version of project.
I want to check the status of different modules before launch actual spectrum window. For that purpose I tried to write code let me explain what I want to do actually in this window.

As shown in picture there are three option for user "restart", "Stop" and "Shutdown"
I want to jump to another respective condition when one of the three button is pressed.

#include "first_page.h"
#include "ui_first_page.h"
#include "QDebug"

first_page::first_page(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::first_page)
{
    ui->setupUi(this);
    timer1 = new QTimer(this);
    connect(timer1, SIGNAL(timeout()), this,SLOT(my_delay1()));
    setWindowFlags(Qt::Dialog | Qt::FramelessWindowHint | Qt::WindowTitleHint);
    timer1->start(1000);


}

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

void first_page::Self_test()
{

   for(int value =0; value<=120; value++)

    {

    QObject::connect(ui->power_off, SIGNAL(clicked()), this, SLOT(on_power_off_clicked()));
        QThread::msleep(200);
        ui->progressBar->setValue(value);

        if(value <= 20)
        {
            ui->OS_status->setText("loading...");
           if(value ==20)
           {
                ui->OS_check->setStyleSheet("border-image: url(:/images/tick4.png)");
                ui->OS_status->setText("successful");
           }
        }

        if(value >20 && value<=40)
        {
            ui->HW_status->setText("loading...");
            if (value ==40)
            {
                ui->HW_check->setStyleSheet("border-image: url(:/images/tick4.png)");
                ui->HW_status->setText("successful");
            }

        }
        if(value >40 && value <= 60)
        {
            ui->Mem_status->setText("loading...");
            if (value ==60)
            {
             ui->Mem_check->setStyleSheet("border-image: url(:/images/tick4.png)");
             ui->Mem_status->setText("successful");
            }

        }
        if(value >60 && value<=80)
        {
            ui->CS_status->setText("loading...");
            if (value ==80)
            {
            ui->CS_check->setStyleSheet("border-image: url(:/images/tick4.png)");
            ui->CS_status->setText("successful");
            }
        }
        if(value >80 && value<=100)
        {
            ui->PM_status->setText("loading...");
            if (value ==100)
            {
            ui->PM_check->setStyleSheet("border-image: url(:/images/tick4.png)");
            ui->PM_status->setText("successful");
            }

        }
        if(value>100)
        {
            qDebug() << "wait";

        }

    }

    this->hide();
    second_page my_secondpage;
    my_secondpage.setModal(true);
    my_secondpage.exec();
    qDebug() << "jump to second page";
}

void first_page::my_delay1()
{
    Self_test();
    qDebug() << "selfTest started";
}

void first_page::on_restart_clicked()
{
    qDebug() << "restart pressed";
}

void first_page::on_pause_pross_clicked()
{
    qDebug() << "Pause pressed";
}

void first_page::on_power_off_clicked()
{
    // //    system("shutdown -P now");
        qDebug() << "power_off pressed";
}

I have pasted all the code related to this window. This is my first window that will popup after the startup window.

Please help me how I can do this?
If one of button from "restart", "Pause" and "shutdown " pressed then how I can jump to respective condition.
for example if "Pause" is pressed then it must stop the progressbarr and selftesting until "Resume" it.

[Mijaz]

@JonB
if the self test successful then it will jump to another window that is secondwindow which all functions of spectrum analyzer.

[Mijaz]

@JonB said in jump to another condition from for loop in qt creator:

What are you using msleep() for?

This msleep() is just used to slow down the progressbar process, without this msleep() the progress bar complete 100% within very short time and user cannot observe that.

[jsulm]

@Mijaz Did you actually address what @JonB pointed out? I mean, all the points.

[Mijaz]

@jsulm I tried to address the points.