c++ - Cannot get Sailfish contacts with QContactManager -

i try jolla's (sailfishos) phonebook contacts qcontactmanager.

qcontactmanager *manager = new qcontactmanager(); qlist<qcontact> results = manager->contacts(); 

results list contains 0 contact.
i check if there error:

qcontactmanager::error error; 

qcontactmanager's error code noerror.
then check available managers.

manager->availablemanagers() 

• org.nemomobile.contacts.sqlite
• invalid

• memory

  qcontactmanager *manager = new qcontactmanager();

  qcontactmanager *manager = new

  qcontactmanager("org.nemomobile.contacts.sqlite");

in both case: manager no error, manager->managername() result invalid.

on other hand, if create manager as:

qcontactmanager *manager = new qcontactmanager("memory"); 

... can use memory based qcontactmanager (for example save , contacts) normally.