nPagesToPrint

The number of pages that will be printed.

Note that this value is set during print preparation phase (%GTK_PRINT_STATUS_PREPARING), so this value should never be get before the data generation phase (%GTK_PRINT_STATUS_GENERATING_DATA). You can connect to the signal@Gtk.PrintOperation::status-changed signal and call method@Gtk.PrintOperation.get_n_pages_to_print when print status is %GTK_PRINT_STATUS_GENERATING_DATA.

This is typically used to track the progress of print operation.