BeginAccept Question

[Nuno Magalhaes]

One thing I've noticed is that if I try that code on a simple form load
event it works ok like this:

....form load event...
Socket socket=new
Socket(AddressF amily.InterNetw ork,SocketType. Stream,Protocol Type.Tcp);
IPEndPoint ep=new IPEndPoint(IPAd dress.Parse(ser verIP),serverPo rt);
socket.Bind(ep) ;
socket.Listen(1 0);
socket.BeginAcc ept(new AsyncCallback(A cceptConnection ),socket);
....
private void AcceptConnectio n(IAsyncResult ar)
{
throw new Exception("Yuhu u");
}

But when I move this code into a private class it doesn't work.
Anyone knows why?

Below is the code:
---------------------------------------
using System;
using System.Net;
using System.Net.Sock ets;

namespace RTSPServer
{
public class TcpServer:IDisp osable
{
private Socket socket;
private Socket clientSocket;
public TcpServer(strin g serverIP,int serverPort)
{
clientSocket=nu ll;
socket=new
Socket(AddressF amily.InterNetw ork,SocketType. Stream,Protocol Type.Tcp);
IPEndPoint ep=new
IPEndPoint(IPAd dress.Any,555);//IPAddress.Parse (serverIP),serv erPort);
socket.Bind(ep) ;
socket.Listen(1 0);
socket.BeginAcc ept(new AsyncCallback(A cceptConnection ),socket);
}
private void AcceptConnectio n(IAsyncResult ar)
{
socket=(Socket) ar.AsyncState;
clientSocket=so cket.EndAccept( ar);
throw new Exception("TCP Accepted on
#"+clientSocket .RemoteEndPoint .ToString());
}
public void Dispose()
{
if(clientSocket !=null)
{
clientSocket.Cl ose();
}
socket.Close();
}
}
}

I think it has something to do with the callback that is *not* called.
If I do an Accept instead of a BeginAccept it works waits ok until a
client establish a connection... but the BeginAccept callback won't
work while inside the private class TcpServer.

I tried from a command line project also and it works but not when
called from a System.Windows. Forms.Form object.

[Nuno Magalhaes]

Here is the two sample codes:
http://pwp.netcabo.pt/0141404701/RTSPServer.cs
http://pwp.netcabo.pt/0141404701/TcpServer.cs

It's a very short program. I tried the TcpServer class on a Console
project and it works ok doing in the main thread:
TcpServer ts=new TcpServer(IPStr ing,555);
Console.Read()

But from a System.Windows. Forms.Form object, for example on the
Form_Load function it won't work.

It's a strange problem!

[Nuno Magalhaes]

If someone could test the two source files posted above, I would be
REALLY appreciated cause it's possibly a bug or something easy I'm not
seeing.

Thank you very much.

[Willy Denoyette [MVP]]

"Nuno Magalhaes" <nu************ @hotmail.com> wrote in message
news:11******** **************@ z14g2000cwz.goo glegroups.com.. .
| If someone could test the two source files posted above, I would be
| REALLY appreciated cause it's possibly a bug or something easy I'm not
| seeing.
|
| Thank you very much.
|

You must keep the TcpServer instance "alive", you set Server by creating an
instance of TcpServer in StartButton_Cli ck, but you don't use the variable
anywhere else in the program, so the JIT compiler reports the variable
'eligible for collection' by setting it's value to null.
Try with a static reference like this:
static TcpServer Server;
but better would be to redesign your application such that you don't create
an instance in a click handler, your handler should only call a method on
the class (StartServer, StopServer etc...).

Willy.

[Nuno Magalhaes]

None of the solutions actually worked but creating a thread and
determining if the client is connected (through a function) worked now.

Thanks for your reply.

Willy Denoyette [MVP] wrote:

"Nuno Magalhaes" <nu************ @hotmail.com> wrote in message
news:11******** **************@ z14g2000cwz.goo glegroups.com.. .
| If someone could test the two source files posted above, I would be
| REALLY appreciated cause it's possibly a bug or something easy I'm not
| seeing.
|
| Thank you very much.
|

You must keep the TcpServer instance "alive", you set Server by creating an
instance of TcpServer in StartButton_Cli ck, but you don't use the variable
anywhere else in the program, so the JIT compiler reports the variable
'eligible for collection' by setting it's value to null.
Try with a static reference like this:
static TcpServer Server;
but better would be to redesign your application such that you don't create
an instance in a click handler, your handler should only call a method on
the class (StartServer, StopServer etc...).

Willy.