Query this with sexp, receiving a list of contacts which matched.
If successful, then the out_contacts is set to newly allocated SList
of Contact(s), which should be freed with
util_free_object_slist.
Note: sexp can be obtained through BookQuery, by
converting it to a string with to_string.
| this |
an BookClient |
| sexp |
an S-expression representing the query |
| out_contacts | |
| cancellable |
a Cancellable; can be null |
|
true if successful, false otherwise. |