QProgressBar

[agupta]

I am new to QT...

I am trying to create an application which reads some data from the database... while retreving the data i want to show the progress bar.

Since i don't know how much amount of time will application take for retreving the data, so i m using the following code for creating busy progress bar.

@static int count;
progressbar = new QProgressBar(this);
@

on the START button click event i m setting

@progressBar->setMinimum(0);
progressBar->setMaximum(0);
progressBar->setValue(++count);@

If user wants to stop the process in between i have given a CANCEL button
on the CANCEL button click event i m setting

@progressBar->reset();@

But if I click on CANCEL button, the progress bar keeps on running, it doesn't reset.

Please let me know if i m missing something here.

[Edit: Code highlighting / Vass]

[vsorokin]

Try on cancel this:
@progressBar->setMaximum(100);
progressBar->setValue(0);@
For example.

And wrap your code in @ tags please (right button on panel)

[agupta]

I used the following code:

@void MainWindow::on_Start_Button_clicked()
{
progressBar->setMaximum(100);
progressBar->setValue(0);
}

void MainWindow::on_Stop_Button_clicked()
{
progressBar->reset();
}@

It show the progess as 0% constantly.
Please let me know what is wrong with the code.

[giesbert]

Hi,

if you set minimum and maximum, you tell progress bar its limits.
You aditionally have to set progressBar->setValue(amountDone); with amountDone = % done. then you will see progress.

[agupta]

Hi....
I don't know how much time will my application take for retreving the data, so in that case i m using the busy progressbar by setting maximum/minimum to 0/0.

@void MainWindow::on_Start_Button_clicked()
{
static int count = 0;
progressBar->setMaximum(0);
progressBar->setMinimum(0);
progressBar->setValue(count++);
}
void MainWindow::on_Stop_Button_clicked()
{
progressBar->reset();
}@

This shows me the busy progress bar, but if i click on Stop button the progress bar is not getting reset. Please let me know do i need to do anything else for resetting the progress bar.

[giesbert]

if min = max = 0, the progress bar is busy. To stop that, set min = 0, max = 1.

[agupta]

Thanks... it works :)

[andre]

Or, you simply hide the progress bar, since nothing is progressing anyway.