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I am creating programs that send and receive files using TCP protocol.
A client and server modules are created and communication between them is through "System.Net.Sockets". Thread is needed for listening to client connection request.
The connection between server and client is restricted to 30 minutes. In my program, the server module enables a 30 min timer when there is a client connection . The timer tick method should be called to disconnect the client after 30 min.
Problem is the tick method is not executed even though the timer is enabled. Pls help if you know where have got wrong. Thanks in advance.
My code at server module:
<u>listen to client</u>
th = new Thread(new ThreadStart(ListenForPeers));
th.IsBackground = true;
th.Start();
<u>ListenForPeers</u>
public void ListenForPeers()
{
//=====Standard socket method======
serversocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
serversocket.Blocking = true ;
IPHostEntry IPHost = Dns.Resolve(server);
string []aliases = IPHost.Aliases;
PAddress[] addr = IPHost.AddressList;
IPEndPoint ipepServer = new IPEndPoint(System.Net.IPAddress.Parse(IP_ADDRESS.Text), 8090);
serversocket.Bind(ipepServer);
serversocket.Listen(-1);
while (runThread) //<<====Start thread to listen to client connection, when server is ready ===
{
clientsock = serversocket.Accept();
if ( clientsock.Connected )
{
total_clients_connected++; // increment client connection counter
if(connectionTimer.Enabled == false) //<<===Enable the timer if it is not able==
{ connectionTimer.Enabled = true; //<<=== Start 30 min timer
}
Thread tc = new Thread(new ThreadStart(listenclient)); //listen to client command call
tc.IsBackground = true;
tc.Start();
}
}
}
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I can see one flaw in the code. Your server app allows n clients to connect, each processed on their own thread while it's the listener thread that seems to be maintaining a timeout check with only one timer. Thus the actual timeout would be 30 mins since the last client connected!
That aside there's not enough code / information here to really determine the issue. I assume you're using the System.Windows.Forms flavour of Timer rather then System.Timers.Timer ?
Duration set to 1800000 (ms)?
I'm largely language agnostic
After a while they all bug me 
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Hi,
Thanks for pointing my flaw. I manage to use System.Threading.Timer to solve my problem
Thanks alot.
Rdgs
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Hello
I am trying to access/read registry of a remote system. I am using RemoteRegistry but is giving Exception : Attempted to perform an unauthorized operation. So i want change the permission to read registry programmatically.
Thanks
Devesh Mishra
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The point of permissions is that they stop you doing things you're not allowed to. Now, if you could change them remotely, what would the point be ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Thanks for your reply..
But tell me how can i change the permission through program and i dont want to change the permission remotely. I want to change the permission by running that application on remote system. is it possible ???
Thanks
Devesh Mishra
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It is possible, I've seen it before, google it.
There are 10 types of people in the world, those who understand binary and those who dont.
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That error is saying the account your code is running under doesn't have the permissions to read the registry on the remote machine. You simply cannot get around this.
You have to use an account that the remote machine can authenticate, such as a Domain Admin account in a domain or AD environment.
In a workgroup environment, the account your code runs under must exist on all the machines you want to connect to AND all those accounts must have the same password.
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Hi,
While executing following line i an getting XML exception
<br />
XslTransform xslt = new XslTransform();<br />
XPathNavigator navigator = xsldoc.CreateNavigator(); try<br />
{<br />
xslt.Load(navigator, null, null);<br />
}<br />
catch(Exception ex)<br />
{<br />
logger.Error("Ex:" + ex.Message + ":" + ex.StackTrace);<br />
}<br />
<br />
Sometimes the above code throws exception with stack strace given below.
<br />
(19,2) :<br />
at System.Xml.Xsl.Compiler.Compile(NavigatorInput input, XmlResolver xmlResolver, Evidence evidence)<br />
at System.Xml.Xsl.XslTransform.Compile(XPathNavigator stylesheet, XmlResolver resolver, Evidence evidence)<br />
at System.Xml.Xsl.XslTransform.Load(XPathNavigator stylesheet, XmlResolver resolver, Evidence evidence)<br />
I looked at MSDN for these function which mentions that this will work only on .Net FrameWork 1.1
On my machine. I have 1.1, 1.1 with hotfixes, 2.0 and 3.0. FrameWork installed.
Regards
Abhi Lahare
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Hello,
I have a strange problem. I want to send some objectes over Ethernet (UDP One packet is one object) After that I Deserialize the data, but I get allways an exception that there is an Invalid binaryheader. I don't have any idea how I can solve it.
my code is
<br />
int size = socket.Receive(buf);<br />
BinaryFormatter serializer = new BinaryFormatter();<br />
MemoryStream ms = new MemoryStream(buf,0,size);<br />
ms.Seek(0, SeekOrigin.Begin);<br />
LogMessage logMessage = (LogMessage)serializer.Deserialize(ms);<br />
Console::WriteLine("{0}", logMessage.ToString());<br />
ms.Close();<br />
and the sending function:
<br />
MemoryStream ms = new MemoryStream();<br />
BinaryFormatter serializer = new BinaryFormatter();<br />
<br />
serializer.Serialize(ms, logMessage);<br />
ms.Flush();<br />
ms.Seek(0, SeekOrigin.Begin);<br />
<br />
byte[] data = ms.ToArray();<br />
socket.Send(data);<br />
ms.Close();<br />
I have checked the MemoryStream and there is the whole data available (Sending and receiving)
LogMessage
Best regards
Hansjörg
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Are you serializing and deserializing using the same .NET Frameowrk / Operating System?
If you are serializing in, for instance, .NET Framework and the deserializing in .NET Compact Framework, this will be an issue.
Otherwise, you can use the XML Serializer, if platform/framework is your problem
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I use the same computer, same plattform and the both projects are in the same solution from vs2005..
I want to use the binary formatter, because I think it is faster and this is needed in my case.
Best regards
Hansjörg
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Maybe it is a good idea to use the SOAP serializer first for debugging purposes. It is easier to review to XML then. It is not very difficult to switch back to the binary serializer once it all works.
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with the soap formatter I have one problem. If I serialize my object then I get a NullReferenceException. The problem it seems that it is a DateTime field. If this field is not inside the class (other data are strings) all works fine.
Do you have any idea?
Best regards
Hansjörg
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I'm not very experienced with this topic. A NullReferenceExpetion means that soemthing is wrong with an object. Likely causes are that you forgot to assign memory (using new) or maybe you try to use an object that no longer exists. Best way to solve this is stepping through the suspected code using the debugger and checking the object values.
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I have checked it...the object that gives the exception is a DateTime value...and this value is okay. I have no idea why...
Best regards
Hansjörg
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I saw you posted this question in another post. There you mentioned other parameters. Did you check these as well? Also check all other variables you use. Somtimes these errors really are obscure, but it is almost certain you did something wrong. You also may try slight code variations, just to see if these work. Fi replace parameters with constant values, replace the datetime by anonther type of object etc. Just keep trying. It may take you two or three days before you find out.
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I have tried a lot of things and now I have found out the problem. For coding I use c++/cli and there it seems that it is not possible to use the DateTime^, but you have to use DateTime...
Best regards
Hansjörg
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I have seen some funny stuff when closing MemoryStream, remove those .Close() for now. If that is the problem, what does work is placing it in a using block.
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It doesn't help...
With the XmlSerializer it works...(but there I have a problem with the DateTime..I have to set there the XmlIgnoreattribute
Best regards
Hansjörg
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as in subject. And put in into array string.
Training makes perfect....
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Hello,
System.IO.Directory.GetFiles method helps you here.
I returns an array of Filennames.
All the best,
Martin
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thanks Martin.
It really help me. I got all what i want from that.
Training makes perfect....
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Glad I could help!
All the best,
Martin
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Need to write a windows service which reads the mails stores on exchange server and should store into local database.
can any body describe with example,
please urgent
thanks in adavance....
Rahul
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