Saving qwt plot as image

[giusepped]

I don't know if somebodyelse did the same question, but I'am unable to save the plot in other formats.
In my function I have

fileName = QFileDialog::getSaveFileName(this, tr("File name"), QString(),        "Graphic files (*.svg,*png)");
    QImage pixmap;
    print(pixmap);
 
   if( pixmap.save(fileName, "PNG" ))
		qDebug()<<"Saved";
   else
		qDebug()<<"Not saved";
 
    }

fileName = QFileDialog::getSaveFileName(this, tr("File name"), QString(),        "Graphic files (*.svg,*png)");
    QImage pixmap;
    print(pixmap);
    
   if( pixmap.save(fileName, "PNG" ))
		qDebug()<<"Saved";
   else
		qDebug()<<"Not saved";
    
    }

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I always get "Not saved". Why?
G