Re: VB.NET Socket - Multiple clients to server

From: User (guest_at_guest.com)
Date: 08/18/04 

Date: Wed, 18 Aug 2004 15:52:39 GMT

Let's say that I run this raw code.

Private MyTcpListener As System.Net.Sockets.TcpListener
Private MySocket As Socket

Dim MyPort as int32
MyPort = 1000

Dim ipHostInfo As IPHostEntry = Dns.GetHostByName(Dns.GetHostName())
   Dim MyIPAddress As IPAddress = ipHostInfo.AddressList(0)
Dim localEndPoint As New IPEndPoint(MyIPAddress, MyPort)

MyTcpListener = New Net.Sockets.MyTcpListener(localEndPoint)
MyTcpListener.Start()

[...]

'Looping periodically on MyTcpListener to see if any client try to
' connect
If Not (MyTcpListener.Pending()) Then
    Exit Sub
else
    MySocket = MyTcpListener.AcceptSocket
End If

For a new connection MySocket will containt information about the new
client information (port, IP).

If I want many clients being able to connect to this server, do I have
to create an array of MySocket? Then any new accepted client would be
indexed (from i=0 to n, n=max connect allowed). That index would be
useful for me.

And I wouldn't have to care anymore with port number? Is that right?

How would I connect a "datareceive event" from any client?

Thanks you!

Michael D. Ober wrote:

> In TCP communications, the listener application binds to an advertised port.
> When a client connects to that port, the IP Stack sends a port number to the
> server. The "accept" call binds that port as well as a new port on the
> server and then sends back the new port on the server. Basically what
> happens is that the communications link is taken to a random port pair - one
> on the client and one on the server. Accept then resets the listener to
> wait for the next connection request. To keep track of your clients, you
> simply need to keep track of the sockets used by accept.
>
> Mike Ober.
>
> "User" <guest@guest.com> wrote in message
> news:OPJUc.25312$X12.22077@edtnps84...
>
>>I thought that a port number was unique to one socket? Is that right?
>>
>>In my implementation, I use the port number as an identifier for the
>>client connection. If I use one socket, is there a unique identifier
>>for any accepted connection?
>>
>>Thank you!
>>
>>
>>
>>Jon Skeet [C# MVP] wrote:
>>
>>
>>>User <guest@guest.com> wrote:
>>>
>>>
>>>>I tried to find the information over the internet but didn't find any
>>>>answers.
>>>>
>>>>I'm looking for a server side code example of winsock accepting many
>>>>clients. I know that in VB.NET it is not implemented like in VB6. What
>>>>I've done is one client per socket. Meaning that each client used a
>>>>different port on the server, but I find it annoying.
>>>>
>>>>I would like to have all clients to connect to the server using one
>
> port.
>
>>>
>>>Just because they're using different sockets doesn't mean that clients
>>>have to connect to different ports. Just use MyTcpListener and call keep
>>>AcceptTcpClient or AcceptSocket and everything will be fine.
>>>
>>
>
>

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