Qt progressbar update value

cdcc0606

I have a progressbar in my code.
ui->progressBar->setRange(0, Nbr_TSendConfig);
ui->progressBar->setValue(0);
ui->progressBar->show();
Here is part of my code.
while(sendleft.length()>0)
{
bool flag;
flag=true;

            taille=sendleft.indexOf(";;;;");
            send=sendleft.left(taille);
            sendleft.remove(0,taille+4);
            if(!data1.sendCardConfig(flag,send,taille))
            {
                QMessageBox::critical(this, tr("Erreur"), tr("Echec de la configuration!"), QMessageBox::Ok);
                ui->progressBar->hide();
                return 0;
            }
            nbr_T++;
            ui->progressBar->setValue(nbr_T);
        }

with this code, sometimes it works fine. But sometimes, il blocks the update of the progress bar, and after a few seconds it jumps to 100% directly at the end.
Why this happens? Is my code lack of something? How can I fix it?

mrjj

Hi
Your while loop might kill the global event loop and all stops to draw.
Try calling
qApp->processEvents();
in the loop.
This is just a workaround. If you need longer lasting loops you should
try to avoid for loops and see if u can design a solution using signals and slots.
Or use a thread.

In any case if for LOOP in the GUI thread too much . all will stop to work. :)

cdcc0606

you are right, now it works fine.