Gets all the UID-s the extra data is set for.
The out_uids should be freed with g_slist_free_full (uids, g_free); when no longer needed.
| this |
an BookCache |
| extra |
an extra column value to search for |
| out_uids |
return location to store the UIDs to |
| cancellable |
optional Cancellable object, or null |
|
Whether succeeded. |