How To Send To Multiple Clients

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3 total messages Started by mike Sat, 07 Aug 2004 16:18

#5474

Author: mike
Date: Sat, 07 Aug 2004 16:18

54 lines
2729 bytes

Hope someone can help me with this, another socket problem.

I have a single Server Socket running in blocking mode, so each client has
its own thread. Everything I have tested works great.

Now, under some conditions the Server receives a message and the Server must
send a message to all the connected clients. So I declared a public routine
SendToAllClients(). The information that needs to be sent to all the clients
is also placed in a public variable.

So what I then do is the following:

In the receiving Server Thread;

           for( int i = 0; i <
Form1->ServerSocket2->Socket->ActiveConnections; i++ )
           {

                TServerClientWinSocket *ClientSocket =
static_cast<TServerClientWinSocket*>(
Form1->ServerSocket2->Socket->Connections[ i ] )           ;

                TMyServerThread *Thread              =
static_cast<TMyServerThread*>(
Form1->ServerSocket2->Socket->GetClientThread( ClientSocket ) ) ;



                if( Thread )
                {
                         Thread->InfoToSendToAllClients     =
DataToSendOutToClient           ;

                                                       ;
                        Thread->SendAnActionToSendToAClient()
;
                    }
                }

           }

So what I am trying to do is send the data contained in
DataToSendOutToClient to all the clients connected. Now everything seems to
work fine, that is the  public routine Thread->SendAnActionToSendToAClient()
does the send but what happens is shortly after the actual socket send takes
place the socket is dropped. There is no exception or error that I can see,
it just simply drops.

So my question is, in a threaded server socket, what is the proper way to
send a message to all connected clients.

Thanks for any information.

Mike

Re: How To Send To Multiple Clients

#5475

Author: Remy Lebeau (TeamB)
Date: Sun, 08 Aug 2004 21:27

23 lines
1833 bytes

"mike" <mfbrowne@earthlink.net> wrote in message
news:41166225$1@newsgroups.borland.com...

> what happens is shortly after the actual socket send takes
> place the socket is dropped. There is no exception or
> error that I can see, it just simply drops.

Please show your actual sending code.  Sockets don't just drop without
saying why, so there has to be an error being reported somewhere..

> So my question is, in a threaded server socket, what is the
> proper way to send a message to all connected clients.

Exactly what you are already doing - looping through the server's
connections sending to each one.  Although I have to question your use of
InfoToSendToAllClients.  What happens if a thread has not sent
InfoToSendToAllClients yet when another multi-client message comes through?
Is InfoToSendToAllClients overwritten?  Sounds like you need to implement
some kind of queing system, if you are not already doing so.


Gambit

Re: How To Send To Multiple Clients

#5479

Author: mike
Date: Tue, 10 Aug 2004 14:52

38 lines
2340 bytes

Remy,

Thanks for answering, but I was being really stupid. On the receiving end of
the broadcast I was closing the socket. It was test code from long ago that
I had forgotten about. I knew it was something stupid and it did not make
sense to me at all, then I found the test code and went "DAh".

Again thanks.

Mike
"Remy Lebeau (TeamB)" <gambit47.no.spam@no.spam.yahoo.com> wrote in message
news:41169ab1$1@newsgroups.borland.com...
>
> "mike" <mfbrowne@earthlink.net> wrote in message
> news:41166225$1@newsgroups.borland.com...
>
> > what happens is shortly after the actual socket send takes
> > place the socket is dropped. There is no exception or
> > error that I can see, it just simply drops.
>
> Please show your actual sending code.  Sockets don't just drop without
> saying why, so there has to be an error being reported somewhere..
>
> > So my question is, in a threaded server socket, what is the
> > proper way to send a message to all connected clients.
>
> Exactly what you are already doing - looping through the server's
> connections sending to each one.  Although I have to question your use of
> InfoToSendToAllClients.  What happens if a thread has not sent
> InfoToSendToAllClients yet when another multi-client message comes
through?
> Is InfoToSendToAllClients overwritten?  Sounds like you need to implement
> some kind of queing system, if you are not already doing so.
>
>
> Gambit
>
>

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