QProgressBar with QNetworkReply

Ketan Shah

Hi,
I am making an application which downloads zip files from internet and extracts it in a particular folder.
The code below shows a progressbar for downloading the files from internet.
what I want to do is to show a progressbar for both downloading and extracting, at present the progressbar for downloading is shown properly but unable to show it for extracting.
I want to set around 80% for downloading and the remaining 20% for extracting, how can I do this, can any one help me find out a solution for this.

@update::update(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::update)
{

bar = new QProgressBar (this);
bar->setStyle(new QPlastiqueStyle);
QNetworkRequest request(url);
currentDownload = manager.get(request);
connect(currentDownload, SIGNAL(downloadProgress(qint64,qint64)),
SLOT(downloadProgress(qint64,qint64)));
connect(currentDownload, SIGNAL(finished()),
SLOT(downloadFinished()));

}

void update::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
{
bar->setMaximum(bytesTotal);
bar->setValue(bytesReceived);
bar->show();
}@

Thanks in advance.

lgeyer

Why not just set a higher maximum? This way the progress bars end at 80% after the download.
@
void update::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
{
bar->setMaximum(bytesTotal + (bytesTotal * 0.25));
bar->setValue(bytesReceived);
bar->show();
}
@

Ketan Shah

Thanks it worked, downloading gets completed on 80%.
Now how can I allot the remaining 20% to unzip process, if you can then please help.

lgeyer

Well, just increase the value until you reach the maximum.
@
class update
{
...

private:
int _extractionStep;
}

void update::startExtraction()
{
// intermediateSteps depends on how your extraction works. if your
// extractionProgress() slot is for example called every percent
// extracted intermediateSteps will be 100.

_extractionStep = (bar->maximum() - bar->value()) / intermediateSteps;

}

void update::extractionProgress()
{
bar->setValue(bar->()value + _extractionStep);
}
@

Ketan Shah

Thanks for the help your code is working as expected, but for extracting I am using QProcess::execute, but this makes the GUI and the progressbar inactive.
The GUI and progressbar becomes active after QProcess::execute have finished its work, also I cannot use QProcess::start as it goes in the background and returns the exit code immediately.
The reason why I am using QProcess::execute is that it returns the exit code after completing the work.

Is there any way that can make QProcess::execute and progressbar work simulataneuosly ?
Can I use QThread ? if yes, how ?

Thanks for the help.

lgeyer

Use QProcess::start() and connect to the "QProcess::finished()":http://developer.qt.nokia.com/doc/qt-4.8/qprocess.html#finished signal, which is emitted as soon as the process has finished and passes the exit code to the slot.