Page 1 of 4

1. Overview
2. A high performance TCP/IP Socket Server COM object
3. An example server in VB
4. Wrap up

Comments

1. Ross Duncan
   11 May 2006 at 16:46

   I ran the server on one machine and the client on another and managed to get a connection and send some data. However after sending a few test messages "1234567890" I try and receive as string at the other end and it stops working. I put in extra calls in the event handlers and they don't get called. The sender thingks it has sent the data. The only way I can stop it is to open the connection again and then press send. Any ideas?
   
   Also when I close down the server, Windows2000 server won't let me delete the file even though it is not in the process list - is there some resource that needs closing in the code somewhere on exit?
   
   I am trying to get a reliable point to point comms for sending some string data.
   
   Ross D.
   
   
   
   
   
   
   
   

2. Len Holgate
   18 Sep 2005 at 22:25

   There was a stupid precedence error in the original code, this may be related to it?
   

   
   LPOLESTR pOle = ((lpa = (char*)mpData) == NULL) ? NULL : ATLA2WHELPER((LPWSTR) alloca(mlength + 1*2), _lpa, mlength);
   

   
   should be
   

   
   LPOLESTR pOle = ((lpa = (char*)mpData) == NULL) ? NULL : ATLA2WHELPER((LPWSTR) alloca((mlength + 1)*2), _lpa, mlength);
   

3. Len Holgate
   18 Sep 2005 at 22:22

   I'm afraid I don't have a free version of this code that includes client support.

4. Len Holgate
   18 Sep 2005 at 22:17

   Yes.

5. Oswaldo Romano Jr.
   19 May 2004 at 15:09

   may I use this library for a client application? do you have another dll to do this (with vb6)? great job

6. Oswaldo Romano Jr.
   18 May 2004 at 17:45
   the function Data.ReadString is not working - any idea? (Data.Read is working normally...) if you type in a terminal it's ok, but if you do a batch the routine stops...
7. Padma
   13 Feb 2004 at 13:32

   There're several useful Winsock tutorial on this site... But its not detailing enough considerations in helping newbie extend the tutorial into actual application environment.  One of them is providing a tutorial on preventing reentrancy when working high socket traffic scenario.
   

   
   Typical Winsock application logic when data arrives...
   

   
   1.  The Winsock_DataArrival event fires when client sockets send data to the listening socket server
   2.  On Data Arrival, Inspect the data received
   3.  Process the data received (e.g.  Lookup Databases, Refresh GUI, and others)
   

   
   When multiple data stream or even large chunk of data arrive while your code is Processing "time-instensive" routines/tasks will require u to implement a FIFO buffer into your code to ensure all incoming data are captured and processed properly...  I'm pleading for the community to add this logic to existing tutorial or post some sample code.  Thanks in advance.
   

8. Czar Eclarinal
   28 Oct 2003 at 04:38

   Does you server support multiple clients connecting simultaneously?

9. Developer Fusion Bot
   01 Jan 1999 at 00:00

   This thread is for discussions of A TCP/IP socket server object for Visual Basic.

Len has been programming for over 20 years, having first started with a Sinclair ZX-80. Now he runs his own consulting company, JetByte Limited. JetByte provides contract programming and consultanc...