- (void)sendSearchRequest:(NSString *)searchField

{

    NSXMLElement *iq = [NSXMLElementelementWithName:@"iq"];

    NSXMLElement *query = [NSXMLElementelementWithName:@"query"];

    [query addAttributeWithName:@"xmlns"stringValue:@"jabber:iq:roster"];

    

    NSXMLElement *item = [NSXMLElementelementWithName:@"item"];

    [item addAttributeWithName:@"jid"stringValue:@"白文龙@localhost"];

    [query addChild:item];

    

    NSXMLElement *item01 = [NSXMLElementelementWithName:@"item"];

    [item01 addAttributeWithName:@"jid"stringValue:@"456@localhost"];

    [query addChild:item01];

    

    [iq addChild:query];

    [iq addAttributeWithName:@"type"stringValue:@"set"];

    [xmppStream sendElement:iq];

    

}