why is my express middleware session undefined? - session

Question

I'm trying to use the express middleware for sessions (I'm not understanding but I feel that I am very close).
the reason I have ended up asking is that the express docs (http://expressjs.com/api.html#middleware) are calling it express.cookieSession where as everyone else (mostly on here) Ive seen discussing it have been calling it express.session. I'm really not sure now, I just have a big lump of possibly useful code ??? but every example I see is different ... how does it work?
var express = require('express')
, http = require('http');
, app = express();
store = new express.session.MemoryStore;
app.use(express.cookieParser());
//app.use(express.cookieSession());
app.use(express.session({secret:'whateverman',key:'express.sid',store:store}));
app.use(app.router);
app.all('/*',function(req,res,next){res.header("Access-Control-Allow-Origin","*");res.header("Access-Control-Allow-Headers","X-Requested-With");next();});
var server = http.createServer(app);
server.listen(8000);
var io = require('socket.io').listen(server);
io.sockets.on('connection',function(socket){
socket.on('reglogin',function(_){_.session.e='some#email.com';});
});
socket.on('reglogin' produces:
TypeError: Cannot set property 'e' of undefined
//-------------------------------update on question
if express is dependant on connect but express can access connects middleware as if it were its own, eg:
app.use(express.cookieSession()); //app is express
app.use(connect.cookieSession()); //does exactly the same
then surely the same logic would apply to socket.io which is dependant on express:
io.use(connect.CookieSession()); //io is socket.io
Am I wrong here? does Socket.io have the same .use method? update:(answer is no to io.use)
io.interoperate(app.use(express.cookieSession())); LOL
----------------------------UPDATE---------------------------------
I've followed the following npm modules guide lines in a despirate attemp to get sessions working and filed each and every time on handshake with no cookie:
express.io
session.socket.io
session.io + sessionstore
currently using the latter with console log:
warn - handshake error Could not find cookie with key: connect.sid