Error in retrieving datas through socket

cmrhema · August 11th, 2007, 03:08 AM

Hello,

We are currently using a program where we recieve the details from the client. It is recieved through sockets.
It is working fine. i.e. When we start the program afresh we do get details properly. We recieve the data as strings and we store in a list box.But after two or three days we have an error stating as below

System.NullReferenceException: Object reference not set to an instance of an object.
at System.Windows.Forms.ListBox.ItemArray.IndexOf(Obj ect item, Int32 stateMask)
at System.Windows.Forms.ListBox.ObjectCollection.AddI nternal(Object item)
at System.Windows.Forms.ListBox.ObjectCollection.Add( Object item)
at StepIIServer.Server.RunClient2() in E:\stepII\Server.cs:line 346
8/7/2007 8:19:26 PM Error :$<MSG.Info.ServerLogin>
$DeviceName=352022000365427
$Software=steppII_2.4.3_final
$Hardware=STEPPII-55
$LastValidPosition=$GPRMC,145245.573,A,2941.6635,N ,07659.7630,E,0.00,2.34,070807,,
$IMEI=352022000365427
$PhoneNumber=
$LocalIP=117.96.20.147
$CmdVersion=2
$SUCCESS
$<end>
&IMEI=352022000365427,Distance=63936,
&GPRMC,145240.574,A,2941.6635,N,07659.7630,E,0. 00, 2.34,070807,,
<end>

and another error stating
ping
System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.Socket.Receive(Byte[] buffer)
at StepIIServer.Server.RunClient2() in E:\stepII\Server.cs:line 288
8/7/2007 5:51:34 AM Error :&IMEI=352022000370849,Distance=1487,
&GPRMC,001830.515,A,2943.0151,N,07658.9818,E,0. 00, 8.79,070807,,
<end>

Will you please help

thanks
Hemalatha

BrainWave · August 14th, 2007, 09:30 AM

Perhaps if you post the source around line 346 and 288 of E:\stepII\Server.cs it will be easier to say what might be going wrong...

cmrhema · August 21st, 2007, 10:33 PM

Thanks for the reply BrainWave
I am putting on the code(a part of as it is very huge)

Code:

if (text7 == "DeviceName")
                            {
                               [u] text2 = textArray2[1];</u>                                text2 = this.GetUnitNoString(text2);
                                string text5 = DateTime.Now.ToString() + ":  Client " + text2 + "  Connected :  " + text3;

                                //text5 
                                this.lbMsgLog.Items.Add(text3);

The Underlined part is place where the error is thrown.

thanks and regards
cmrhema

BrainWave · August 22nd, 2007, 03:07 AM

Are you sure the error occurs where you've underlined? It seems more likely that it happens at:

Code:

this.lbMsgLog.Items.Add(text3);

In that case, I'm no expert - I haven't used ListBox much. Could it be that text3 is null? I don't know how ListBox would react to that...

You haven't posted anything about the second exception, but that might be a follow on exception.

cmrhema · August 22nd, 2007, 04:51 AM

Thanks for the reply. Infact I was referring to the second exception.
The first exception has been solved. It was indeed a null value being sent.