[Qt-interest] QProgressBar kind of functionality withQProgressDialog (Size of file being copied not known)

[Usman Ajmal]

Many thanks Ben.

Frankly i din get any help from those posts :)
Could not understand how do i use event loops. Anyways i am looking into it.
lets see.
On Thu, May 28, 2009 at 11:09 PM, Ben Swerts <benswerts at telenet.be> wrote:

>
> HI Usman,
>
> I hope you understood from the other posts that you need to let the
> eventloop spin (e.g. QApplication::processEvents) such that the
> QProgressDialog can be shown. There are, however, a few other caveats you
> should be aware of:
>
> - QProgressDialog is only shown after the specified minimumDuration(). The
> default value is 4 seconds, but as you mentioned that the process runs for
> a
> few minutes you don't have to worry about that.
>
> - The progress bar can be made moving by setting the same minimum and
> maximum value. I had to perform a workaround (Qt 4.3.3) to actually get it
> to move in the QProgressDialog:
>
>  progressDialog->setRange(0, 1);
>  progressDialog->setValue(0);
>  progressDialog->setRange(0, 0);
>
> I don't know whether this fix is still needed with the latest version of
> Qt.
>
> Hope it helps.
> Greets,
>
>
>        Ben
>
> > Let me rephrase my question:
> >
> > Can i show the progress of my operation with the help of a blue fluid
> > moving to and from in the bar of QProgressDialog?
> >
> > I want such functionality because i don't know the size of the operation.
> >
> > I went through QProgressDialog class reference but invain. Kindly suggest
> > something.
> >
> > Thanks
> >
> >
> > On Mon, May 25, 2009 at 12:33 PM, Usman Ajmal <uzmanajmal at gmail.com>
> > wrote:
> >
> >
> >       Hi,
> >       I set setMaximum() and setMinimum(), of QProgressBar, equal to zero
> > which gave be the ability to show a kinda progress without showing the
> > percentage of the operation completed. It only showed a blue fluid moving
> > to and from in the bar which showed that something is being copied.
> >
> >       Now i want to have the same kind of progress presentation with
> > QProgressDialog but i could not see anything showing up when i start the
> > operation. I don't see even the dialog.
> >
> >       Following z the snippet from my code: In following code 'line' is
> > QString and 'image' is QTextStream.
> >
> >       QProgressDialog progress("Copying files...", "Abort Copy", 0, 0,
> > this);
> >       while (!line.isNull())
> >                   {
> >                       if (progress.wasCanceled())
> >                            break;
> >                       line = in.readLine();
> >                       image<<line<<endl;
> >
> >                   }
> >
> >       What else do i need to add here?
> >
> >       Thanks.
> >
> >       --
> >       Usman
> >
> >
>
>
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