saving QPixmap to QIODevice gives SEGV error

[sattu]

Hello all,

I am trying to capture a screenshot of my Application in a QPixmap and then save it to a QIODevice. But it's giving segmentation fault.
Not able to figure out why.

Here's the code-

QPixmap pix =  QPixmap::grabWindow(QApplication::desktop()->winId());
 
ui.myLabel->setPixmap(pix);  //This is fine. Displays the Screenshot
ui.myLabel->setScaledContents(true);
 
QByteArray bArray;
QBuffer buffer(&bArray);
buffer.open(QIODevice::WriteOnly);
 
        qDebug()<<"before";
        pix.save(&buffer);  //Gives SEGV Error
        qDebug()<<"after";
 
buffer.close();

QPixmap pix =  QPixmap::grabWindow(QApplication::desktop()->winId());

ui.myLabel->setPixmap(pix);  //This is fine. Displays the Screenshot
ui.myLabel->setScaledContents(true);

QByteArray bArray;
QBuffer buffer(&bArray);
buffer.open(QIODevice::WriteOnly);

        qDebug()<<"before";
        pix.save(&buffer);  //Gives SEGV Error
        qDebug()<<"after";

buffer.close();

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Not able to figure out what the problem is.