xmpp查询，头疼，

- (void)sendSearchRequest:(NSString *)searchField

{

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

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

    [query addChild:[NSXMLElementelementWithName:@"name"stringValue:@"hello"]];

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

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

    [iq addAttributeWithName:@"to"stringValue:@"456@localhost"];

    [iq addAttributeWithName:@"from"stringValue:@"123@localhost"];

    [iq addChild:query];

    [xmppStream sendElement:iq];

}