@aamer4yu, below is imglist, so it's not a list with pointers. Thanks anyway, I didn't know function qDeleteAll().
Qt Code: 
  1. QList <QImage> imglist;
To copy to clipboard, switch view to plain text mode 

@bluske
If what you say is true, then what happens if another process request memory and there's only more or less swap left, will it still not use the freed memory from that one process?