"IOS XMPP" using Xmppframewok (v): Friends List

Transferred from: http://www.cnblogs.com/dyingbleed/archive/2013/05/17/3082226.html

Friends List

Buddy List, called roster in XMPP, roster?

Get roster requires client to send <iq/> label to XMPP server-side query

An IQ request:

<iq type= "Get"

from= "[Email protected]"

to= "example.com"

Id= "1234567" >

<query xmlns= "Jabber:iq:roster"/>

<iq/>

The Type property, which describes the IQ as a get, is similar to HTTP, requesting information from the server side

From property, message source, here is your JID

To attribute, message destination, here is the server domain name

ID attribute, which marks the request ID, when the server finishes processing a request for a get type of IQ, the response result type IQ ID is the same as the ID of the request IQ

<query xmlns= "Jabber:iq:roster"/> sub-tab, stating that the client needs to query roster

-(void) Queryroster {    nsxmlelement *query = [nsxmlelement elementwithname:@ "Query" xmlns:@ "Jabber:iq:roster"];    Nsxmlelement *iq = [nsxmlelement elementwithname:@ "IQ"];    Xmppjid *myjid = Self.xmppStream.myJID;    [IQ addattributewithname:@ "from" stringValue:myJID.description];    [IQ addattributewithname:@ "to" stringValue:myJID.domain];    [IQ addattributewithname:@ "id" stringvalue:[self Generateid]];    [IQ addattributewithname:@ "type" stringvalue:@ "get"];    [IQ addchild:query];    [Self.xmppstream Sendelement:iq];}

An IQ response:

<iq type= "Result"

Id= "1234567"

to= "[Email protected]" >

<query xmlns= "Jabber:iq:roster" >

<item jid= "[email protected]" name= "Xiao Yan"/>

<item jid= "[email protected]" name= "Xiao Qiang"/>

<query/>

<iq/>

The type attribute, which describes the result of the IQ, is the results of the query

<query xmlns= "Jabber:iq:roster"/> Label Sub-label <item/>, for the child of the query, that is, roster

The item tag's properties, including the friend's JID, and other optional attributes, such as nicknames.

By implementing

-(BOOL) Xmppstream: (xmppstream *) sender Didreceiveiq: (Xmppiq *) IQ;

Method

When the content of the <iq/> Tag is received, the Xmppframework framework callbacks the method

-(BOOL) Xmppstream: (Xmppstream *) sender Didreceiveiq: (XMPPIQ *) IQ {    if ([@ "result" isEqualToString:iq.type]) {        nsxmlelement *query = iq.childelement;        if ([@ "Query" IsEqualToString:query.name]) {            Nsarray *items = [query children];            For (nsxmlelement *item in items) {                NSString *jid = [item attributestringvalueforname:@ "Jid"];                Xmppjid *xmppjid = [Xmppjid Jidwithstring:jid];                [Self.roster Addobject:xmppjid];}}}    

"IOS XMPP" using Xmppframewok (v): Friends List