refreshing labels

[marcel]

You set the numbers too fast. The label doesn't get the chance to update.
You should use a QTimer with an interval of 100-200ms. Connect its timeout signal to a slot in which you update the label with a new value. Then you will be able to see something.

[ht1]

Thanks Marcel, but I think something else than speed is the problem.
The code that I designated as (//main code here) is very long and takes a long time to compile. The labels have about a minute to refresh. Maybe the labels don't refresh because the processor is 100% busy with doing the math?

[jacek]

Maybe the labels don't refresh because the processor is 100% busy with doing the math?

Yes, you block the Qt's event loop and Qt can't redraw anything or even process user's input. You can avoid this by invoking QCoreApplication::processEvents() from time to time or using QTimer to drive your loop. A third option is to move those computations to a thread.

[jpn]

In other words, events don't get processed during a busy loop. When you change the contents of a label, a few events get scheduled (to update the label). But no event reaches its receiver until you return the control to the event loop. One simple but a bit ugly solution is to force the application to process its events:

for (int kk=1; kk<100; kk++)
{
    //main code is here
    Label->setNum(kk);
    QApplication::processEvents(); // <--
}

for (int kk=1; kk<100; kk++)
{
    //main code is here
    Label->setNum(kk);
    QApplication::processEvents(); // <--
}

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