How to get friends from XMPPRoster?

Question

I try like this:

XMPPRosterMemoryStorage *xmppRosterMemStorage = [[XMPPRosterMemoryStorage alloc] init];
XMPPRoster *xmppRoster = [[XMPPRoster alloc] initWithRosterStorage:xmppRosterMemStorage
                                         dispatchQueue:dispatch_get_main_queue()];
[xmppRoster addDelegate:self delegateQueue:dispatch_get_main_queue()];
xmppRoster.autoAcceptKnownPresenceSubscriptionRequests = true;
xmppRoster.autoFetchRoster = true;
[xmppRoster activate:xmppStream];
[xmppRoster fetchRoster];

But xmppRoster is empty. Why?

Answer 1

Roster items are stored in [xmppRosterMemStorage mainThreadManagedObjectContext], you can use it with NSFetchedResultsController as datasource for your UITableView, see iPhoneXMPP example in the XMPPFramework sources

Answer 2

If you do not want to use NSFetchedResultsController, you can get the JIDs of your roster from calling jidsForXMPPStream on the roster storage object.

Here's how I have used it -

- (void)xmppRosterDidEndPopulating:(XMPPRoster *)sender{
    [appDelegate.mContactHandler clearContacts];
    NSArray* jids = [mXmppRosterStorage jidsForXMPPStream:self.xmppStream];
    for (int i=0; i<jids.count; i++)
    {
        RosterContact* contact = [[RosterContact alloc]init];
        contact.jid = [jids objectAtIndex:i];
        [appDelegate.mContactHandler addContact:contact];
    }
    [self postResultNotification:kReload withResult:nil];
}

I have used XMPPRoster's delegate method to know when the roster have finished loading. I then extract the jid from the storage and create my own RosterContact object which is just a custom class I have created to store contact data. I then post a notification to reload the tableview where I am showing the contact list.

Here's my roster declaration -

mXmppRosterStorage = [[XMPPRosterCoreDataStorage alloc] init];

mXmppRoster = [[XMPPRoster alloc] initWithRosterStorage:mXmppRosterStorage];

mXmppRoster.autoFetchRoster = YES;
mXmppRoster.autoAcceptKnownPresenceSubscriptionRequests = YES;

I hope this will be useful.

Answer 3

Here is my solution for swift.

https://stackoverflow.com/a/50151198/2781720

func getList() {
  let query = try! XMLElement(xmlString: "<query xmlns='http://jabber.org/protocol/disco#items' node='all users'/>")
  let iq = XMPPIQ(type: "get", to: XMPPJID(string: "Your Host Name"), elementID: xmppStream.generateUUID(), child: query)
  iq?.addAttribute(withName: "id", stringValue: "get")
  xmppStream.send(iq)
}

extension YourClassName: XMPPRosterDelegate {

   func xmppRosterDidEndPopulating(_ sender: XMPPRoster!) {
     if let jids = xmppRoster.xmppRosterStorage.jids(for: xmppStream) as? [XMPPJID] {
       print("JIDS: \(String(describing: jids))")
       for item in jids {
         print(item.user)
       }
     }
   }
 }

Hope this helps!