[Qt-interest] query on QProcess

[Chandru...]

you are using linux or windows ..?

 may be the xx.exe will have an improper buffer flush ...
 if linux try   " xx.exe  |  less"  and see if it takes exact time that
happens in qprocess stdOut() .....

On Mon, May 18, 2009 at 11:17 AM, Princy K. V. <princy.kv at nestgroup.net>wrote:

>  Hi,,
>
>  I have a query on QProcess..Plse see the code snippets below…
>
> The actual running time of xx.exe for a particular argument is 7
> minutes…But when  started from my qt application..it takes longer time,, and
> system become too slow,,cpu usage goes to 100 percentage…why is it so?? Is
> it due to memory leakage??
>
> Do I need to release memory allocated for Qprocess by using stmnt ‘ delete
> process’ or ‘delete this ‘ in destructor sufficient?Plse help…thanks in
> advance..
>
>
>
> void CMainWindow::Run()
>
> {
>
> process = new QProcess(this);
>
> connect(process, SIGNAL(readyReadStandardError()), this,
> SLOT(updateError()));
>
> connect(process, SIGNAL(readyReadStandardOutput()), this,
> SLOT(updateText()));
>
> connect(process, SIGNAL(finished(int)), this, SLOT(updateExit(int)));
>
> process->start("xx.exe" ,arguments);
>
> }
>
> void CMainWindow::updateText()
>
> {
>
> while(process->canReadLine())
>
> {
>
> QByteArray data = process->readLine(200);// The Application turns to not
> responding when a line is added to
>                               //listwidget..
>
>
>
>
>
> ui->listWidget->addItem(QString(data));
>
> QScrollBar *bar = ui->listWidget->verticalScrollBar();
>
> bar->setValue(bar->maximumHeight());
>
> ui->listWidget->setAutoScroll(true);
>
> ui->listWidget->scrollToBottom();
>
> ui->listWidget->repaint();
>
> }
>
> }
>
>
>
> Thanks & Regards,
>
> princy
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