Realy a newbie at this but i cant get it to work, thanx for sharing this code first. I made it this far, i always get unable to save image (path is ok to where it wants to save and extension). My code till now:

Qt Code: 
  1. void ImageViewer::save()
  2. {
  3.  	// construct a filter of all supported formats
  4. 	QString filter;
  5. 	QImage image;
  6. 	QList<QByteArray> formats = QImageWriter::supportedImageFormats();
  7. 	foreach (QString format, formats)
  8. 	{
  9. 		filter += QString("%1 files (*.%2);;").arg(format.toUpper()).arg(format);
  10. 	}
  11.  
  12. 	// remove unnecessary chars from the end of the filter
  13. 	if (filter.endsWith(";;"))
  14. 	{
  15. 		filter.chop(2);
  16. 	}
  17.  
  18. 	// get save file name
  19. 	QString selectedFilter;
  20. 	QString s = QFileDialog::getSaveFileName(this, "Save image as", QDir::currentPath(), filter, &selectedFilter);
  21.  
  22. 	if (!s.isEmpty())
  23.     	{
  24.  
  25. 	// check for the selected format
  26. 	QString format = selectedFilter.split(" ").at(0);
  27. 	QFileInfo fi(s);
  28.  
  29. 	if (!fi.suffix().endsWith(format, Qt::CaseInsensitive))
  30. 	{
  31. 		// remove possible incorrect suffix
  32. 		s.chop(fi.suffix().length());
  33. 		 // set correct suffix
  34. 		s += "." + format.toLower();
  35. 	}
  36.  
  37. 	// save image in the selected format
  38. 	if (!image.save(s, format.toAscii().constData()))
  39. 	{
  40. 		QMessageBox::information(this, "Image Viewer", QString("Unable to save %1.").arg(s));
  41. 	}
  42. 	}
  43. }
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