Receive Contact from the this for
the gived uid.
If successful, then the out_contact is set to newly allocated
Contact, which should be freed with
unref.
| this |
an BookClient |
| uid |
a unique string ID specifying the contact |
| out_contact |
an Contact for given |
| cancellable |
a Cancellable; can be null |
|
true if successful, false otherwise. |