LBnet and TCP

[Tasp]

Is the LBnet.dll capable of using TCP comms?

It works UDP without any issues. But have now moved onto requiring TCP connections instead.

DLL can be found here for those that need a UDP version, LBNet on Github

[Chris Iverson]

Yeah, the same DLL can do TCP and TLS as well.

Most of the code is fairly similar for doing TCP. Just take UDP out of the function name, and most of the UDP test code will work the same. The only ones that don't convert are UDPSendTo and UDPReceiveFrom(and UDPConnectFrom).


I should make a separate file to show the wrapper functions for just TCP, though, and a full proper release.

You can get the full WrapperFunctions.bas file here:

github.com/iversc/lbnet/blob/master/WrapperFunctions.bas


With those wrapper functions in place, here's a quick little TCP demo implementing a tiny bit of HTTP:

   call OpenLBNetDLL

   input "press ENTER to begin.";a

   connectServer$  = "www.google.com"
   port$ = "80"
   timeout = 0
   hSock = Connect(connectServer$, port$, timeout)
   if IsSocketInvalid(hSock) then
       print "Connect() failed. - ";GetError()
       goto [doEnd]
   end if

   print "Connect() successful."

   crlf$ = chr$(13) + chr$(10)
   lf$ = chr$(10)
   request$ = "GET / HTTP/1.1" + crlf$ + _
              "Host: google.com" + crlf$ + crlf$

   lenRequest = len(request$)
   print "Send() - ";UDPSend(hSock, request$, lenRequest)

[respLoop]
   timer 0
   print "Waiting for response..."
   ret = IsReadAvailable(hSock, 0)

   if ret = 0 then
       print "Still waiting..."

       timer 1000, [respLoop]
       wait
   end if

[doReceive]

   bufLen = 1024
   buf$ = space$(bufLen)

   num = Receive(hSock, buf$, bufLen)
   theError = GetError()

   if num = -1 then
       if theError = 10101 or theError = 10054 then
           print "Connection closed or reset by peer."
       else
           print "Socket error occurred. - ";theError
       end if

       goto [doClose]
   end if


   print "Response - ";left$(buf$, num)

[doClose]
   a = CloseSocket(hSock)

[doEnd]
   call CloseLBNetDLL

[Tasp]

I'm sure there was a TCP Server demo code on one of your original versions/posts but cannot find it anywhere?

In the wrapper code, I dont see anything specific to TCP? Are you saying we can use UDPxxxxxx functions but it will work in a TCP enviroment?

[Chris Iverson]

I think I've accidentally overwritten them when I was adding features to the DLL. I'll get a new proper example written up and included.


And I meant that the TCP versions of a lot of the functions just don't have UDP in the name.

UDPConnect/Connect, UDPCreateListenSocket/CreateListenSocket, UDPSend/Send, UDPReceive/Receive, UDPClose/CloseSocket.

[Chris Iverson]

I've pushed a new change to github, adding two new files: test-tcp-client.bas and test-tcp-server.bas.

Click those links to get the source code for those files. Should work fine with the already-available LBNet DLL.

[cryptomen]

Where can I download LBNet.DLL?

[Rod]

The first post has Chris’s link to GitHub