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create a client to chat with facebook
NullReferenceException: Object reference not set to an instance of an object.    at Matrix.Net.ClientSocket.Send(Byte[] bData)
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talaviss@gmail.com 2011-08-14, 12:07 #1
Member since Aug 2011 · 4 posts
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Subject: create a client to chat with facebook
2011-08-14 12:58:05->XmppClientOnSendXmlMatrix.TextEventArgs
2011-08-14 12:58:05->xmppClient_OnErrorSystem.NullReferenceException: Object reference not set to an instance of an object.
   at Matrix.Net.ClientSocket.Send(Byte[] bData)
2011-08-14 12:58:17->XmppClientOnSendXmlMatrix.TextEventArgs
2011-08-14 12:58:17->XmppClientOnSendXmlMatrix.TextEventArgs
2011-08-14 12:59:17->xmppClient_OnCloseMatrix.EventArgs

My client code is as follows:

            xmppClient.OnBeforeSasl += xmppClient_OnBeforeSasl;
            xmppClient.OnError += xmppClient_OnError;
            xmppClient.OnAuthError += new EventHandler<Matrix.Xmpp.Sasl.SaslEventArgs>(xmppClient_OnAuthError);
            xmppClient.OnMessage += new EventHandler<MessageEventArgs>(xmppClient_OnMessage);
            xmppClient.OnClose += new EventHandler<Matrix.EventArgs>(xmppClient_OnClose);
            xmppClient.OnLogin += xmppClient_OnLogin;
            xmppClient.OnSendXml += XmppClientOnSendXml;
            xmppClient.OnReceiveXml += XmppClientOnReceiveXml;
            xmppClient.Show = Matrix.Xmpp.Show.chat;
            xmppClient.Hostname = "chat.facebook.com";
            xmppClient.XmppDomain = "chat.facebook.com";



         
                xmppClient.Send(new Message
                {
                    To = "oren.farber@chat.facebook.com",
                    From = "tal.avissar@chat.facebook.com",
                    Type = MessageType.chat,
                    Body = "Just Testing the XMPP SDK"
                });
       
            xmppClient.Open();
 
            xmppClient.Send(new Message
            {
                To = "firstname.lastname@chat.facebook.com",
                From = "firstname2.lastname2@chat.facebook.com",
                Type = MessageType.chat,
                Body = "Just Testing the XMPP SDK2"
            });
       

            Console.ReadLine();

i'm getting the above error NullReferenceException: Object reference not set to an instance of an object.
   at Matrix.Net.ClientSocket.Send(Byte[] bData)
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Alex 2011-08-14, 12:52 #2
Member since Feb 2003 · 4449 posts · Location: Germany
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The library is all async. When the open call returns it started the process of connecting. You can't send a message directly after open.
Wait until you got the OnRosterEnd event or the first OnPresence event.
You also don't need to add from on outgoing packets. The server stamps all outgoing packets with the correct address.

Alex
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talaviss@gmail.com 2011-08-14, 14:22 #3
Member since Aug 2011 · 4 posts
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I keep receiving not authorized response from facebook

i'm using
   static private void xmppClient_OnBeforeSasl(object sender, Matrix.Xmpp.Sasl.SaslEventArgs e)
        {
            Log("xmppClient_OnBeforeSasl" );
            e.Auto = false;
            e.SaslMechanism = Matrix.Xmpp.Sasl.SaslMechanism.DIGEST_MD5;
                 
        }

and
           xmppClient.Username = "myealfacebookusername";
            xmppClient.Password = myrealfacebookpassword";

but recieivng in response

XmppClientOnSendXml<response xmlns="urn:ietf:params:xml:ns:xmpp-sasl">dXNlcm5hbWU9InRhbGF2aXNzQGdtYWlsLmNvbSIscmVhbG09ImNoYXQuZmFjZWJvb2suY29tIixub25jZT0iQUM2MjNGODYxQ0UyOTlFOENGQTI3QTdERDhFMTExODUiLGNub25jZT0iOGNkN2Y3ZTNjMmU5MDM3NGY1NTJmZTdiZDRiNDc3YmIzNjMyMTQ1MmM1ZmVlNDc3MGNjNGY0NTA5MDQwMWE2MSIsbmM9MDAwMDAwMDEscW9wPWF1dGgsZGlnZXN0LXVyaT0ieG1wcC9jaGF0LmZhY2Vib29rLmNvbSIsY2hhcnNldD11dGYtOCxyZXNwb25zZT00OWJjOTk2NmZjNTAwZWVjMzQ2NGFkNmU2MjhjM2Q3ZA==</response>
2011-08-14 15:18:29->XmppClientOnReceiveXml<failure xmlns="urn:ietf:params:xml:ns:xmpp-sasl">
  <not-authorized />

also i have tried:
 
            e.Auto = false;
            e.SaslMechanism = Matrix.Xmpp.Sasl.SaslMechanism.X_FACEBOOK_PLATFORM;

            e.SaslProperties = new Matrix.Xmpp.Sasl.Processor.Facebook.
            {
                ApiKey = API_KEY,
                ApiSecret = API_SECRET,
                SessionKey = "220a1692fd81e15165aa930f02.1-xxxxxxxx"   
        };

but still not authorize, maybe beacuse my session  id is expired? how can i fetch easily the session id if i have a desktop client?
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talaviss@gmail.com 2011-08-14, 16:18 #4
Member since Aug 2011 · 4 posts
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ok I solved my problem.

but still when i want to authenticate with FB and perform

http://www.facebook.com/login.php?api_key=myapikey&con…

i recieve back the json

perms=offline_access%2Cxmpp_login&session=%7B%22session_key%22%3A%22ce1f3c8512ef3af17d13fab9.0-694458257%22%2C%22uid%22%3A694458257%2C%22expires%22%3A0%2C%22secret%22%3A%22463df26dc4f995ced459fd708f27e269%22%2C%22base_domain%22%3A%22mydomain.com%22%2C%22sig%22%3A%2208e2a9bde419540095c4cbfa49413b2a%22%7D

from this long http response what sould i assign to the SessionKey parameter?
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talaviss@gmail.com 2011-08-14, 16:32 #5
Member since Aug 2011 · 4 posts
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Subject: session_key oAuth 2.0
from what i know Facebook have deprecated the session_key and now with thw oAuth 2.0 mechanism you have to supplu the
access_token

http://developers.facebook.com/docs/authentication/

http://stackoverflow.com/questions/4435692/facebook-gettin…
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Alex 2011-08-14, 20:48 #6
Member since Feb 2003 · 4449 posts · Location: Germany
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for user&password auth please follow this link to see what your valid credentials should be:
http://www.facebook.com/sitetour/chat.php

for X-FACEBOOK-PlATFORM authentication please read the following:
http://www.ag-software.net/matrix-xmpp-sdk/matrix-develope…

Both authentication mechanism work without problems in MatriX.

Alex
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