objective c - How to add buddy/user in group in xmpp iphone? -

i have wrote code creating room. using had created room in openfire.

-(void)creategroup:(nsstring*)groupname {       xmpproomcoredatastorage *rosterstorage = [[xmpproomcoredatastorage alloc] init];                   xmpproom = [[xmpproom alloc] initwithroomstorage:rosterstorage jid:[xmppjid jidwithstring:[nsstring stringwithformat:@"%@@conference.%@/%@",groupname,@"server",self.strusername]] dispatchqueue:dispatch_get_main_queue()];        [xmpproom activate:[self xmppstream]];       [xmpproom joinroomusingnickname:@"nickname" history:nil];       [xmpproom adddelegate:self delegatequeue:dispatch_get_main_queue()];       [self performselector:@selector(configurenewroom) withobject:nil afterdelay:5];    } -(void)configurenewroom {     [xmpproom fetchconfigurationform];     [xmpproom configureroomusingoptions:nil]; } 

now want add buddy/users in group. how can ? in advance.

// using done

    xmpproommemorystorage *roommemorystorage = [[xmpproommemorystorage alloc] init];     nsstring *strjid = [nsstring stringwithformat:@"%@@conference.%@/%@",groupname,strhostname,self.strusername];     self.xmpproom = [[xmpproom alloc] initwithroomstorage:roommemorystorage jid:[xmppjid jidwithstring:strjid] dispatchqueue:dispatch_get_main_queue()];     [self.xmpproom adddelegate:self delegatequeue:dispatch_get_main_queue()];     [self.xmpproom activate:self.xmppstream];     [self.xmpproom joinroomusingnickname:self.strusername history:nil];      //inviting     nsstring *strinvitedusername = [nsstring stringwithformat:@"%@@%@",personname,strhostname];     [self.xmpproom inviteuser:[xmppjid jidwithstring:strinvitedusername] withmessage:message];