http://www.cnblogs.com/joesen/p/3559516.html

pragma mark - 获取讨论组成员

• (void)getDiscussionMemberInfoWithSendIq:(discussionModel *)data
  {

  NSXMLElement *iq = [NSXMLElement elementWithName:@"iq"];
  NSXMLElement *getUsers = [NSXMLElement elementWithName:@"getUsers"];

  [iq addAttributeWithName:@"id" stringValue:@"SPUT4-6"];
  [iq addAttributeWithName:@"type" stringValue:@"get"];
  [iq addAttributeWithName:@"from" stringValue:[NSString stringWithFormat:@"%@",[xmppStream myJID]]];

  [getUsers addAttributeWithName:@"xmlns" stringValue:@"com:im:roominfo"];
  [getUsers addAttributeWithName:@"roomId" stringValue:[Unity jidWithName:data.roomKey]];

  [iq addChild:getUsers];

  [xmppStream sendElement:iq];
  }

pragma mark - 解析讨论组成员

• (void)analyticDiscussionMemberWithIq:(XMPPIQ *)iq
  {
  if ([@"result" isEqualToString:iq.type]) {
  NSXMLElement *member = iq.childElement;
  if ([@"mucinfo" isEqualToString:member.name])
  {
  NSMutableArray *memberArr = [[NSMutableArray alloc]init];
  NSArray *items = [member children];
  for (NSXMLElement *item in items) {
  discussionInfoModel *disInfo = [[discussionInfoModel alloc]init];
  disInfo.memberName = [item stringValue];
  disInfo.memberId = [item attributeStringValueForName:@"jid"];
  disInfo.memberPicUrl = [item attributeStringValueForName:@"headPhoto"];
  [memberArr addObject:disInfo];
  }

        if ([delegate respondsToSelector:@selector(passDiscussionMebmer:)]) {
            [delegate passDiscussionMebmer:memberArr];
        }
  
    }
  

  }

}