how to show and hide Qlabel continuously on mainwindow

Hello all,
I am new to Qt, please tell me how to show and hide the Qlabel message continuously on my mainwindow...

Here is my code..

MainWindow.cpp

Code:

---

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    label=ui->label;
 
display();
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::display()
{
    while(1)
    {
        label->show();
        sleep(1000);
        label->hide();
    }
}

---

when i run the program mainwindow is not comming...and no errors are comming..
Please help me..
Thank you.

First of all loop in MainWindow::display is "never ending story". Thus MainWindow constructor is blocking application.
Second UI need working event loop but You are blocking her. Read about QTimer.

Thank you for the reply....can u please provide with an example code..
I didn't get ur point..

Thanks in advance..

Method display should be defined as slot and looks like :

Code:

---

void MainWindow::display()
{
    label->setVisible(!label->isVisible());// Set the status of the opposite
    QTimer::singleShot(500,this,SLOT(display()));// call display() after 500 ms
}

---

Quote:

---

Originally Posted by Lesiok

Method display should be defined as slot and looks like :

Code:

---

void MainWindow::display()
{
    label->setVisible(!label->isVisible());// Set the status of the opposite
    QTimer::singleShot(500,this,SLOT(display()));// call display() after 500 ms
}

---

---

Thanks for the reply sir..

I was placed that method...but when i run my program..it is showing that..
"The program has unexpectedly finished."

Thanks in advance..

Run your program in your debugger. When it crashes look at where it crashed in the back trace you will likely be given.