Qt change picture on timer - c++

Question

I'm trying to change the image on QLabel in Qt.
At first, I did the basic set image as follows:
void MainWindow::setMainDisplayNew(QString imageName){
QPixmap pix7 = imageName;
QPixmap pix8 = pix7.scaled(QSize(720,480), Qt::KeepAspectRatio);
ui->mainDisplay->setStyleSheet(imageName);
ui->mainDisplay->setPixmap(pix8);
}
Now I want to change this so I can pass 2 arrays. List of images and duration they should appear for and I want the display to show them for the indicated duration.
void MainWindow::setMainDisplay(QString imageName[], int size)
{
for(unsigned int i=0; i<size; i++)
{
QTimer * timer = new QTimer(this);
timer->setSingleShot(true);
connect(timer, &QTimer::timeout, [=](){
setMainDisplayNew(imageName[i]);
timer->deleteLater(); // ensure we cleanup the timer
});
timer->start(3000);
}
}
EDIT
With the help of the responses, I reached the above code. I am sending the 3 images. It is display the final image after 3 seconds and stays as is... Any help?

Answer 1

while(true){
This is your problem. Qt is an event-driven framework. The while(true) prevents events from being processed. Such events include the timeout from the QTimer and updating of the GUI. You need to allow the function to exit.
In addition, you're not cleaning up your timers, so you're leaking memory every time you enter the function (although that's currently only once!). You can clean up with a call to deleteLater.
Using C++ 11, it would be something like this: -
for(int i=0; i<mySize; i++)
{
QTimer * timer = new QTimer(this);
timer->setSingleShot(true);
connect(timer, &QTimer::timeout, [=](){
setMainDisplayNew(imageName[i]);
timer->deleteLater(); // ensure we cleanup the timer
});
timer->start(duration[i]);
}