Hi Lusty
use f.e. wireshark ( http://www.wireshark.org/ ) to capture all packets
"sent to" and "received from" your machines.
Then you'll know if the 7 sec delay is a problem caused by your machines or
by your code ;-).
Regards
Michael
----- Original Message -----
From: "Christopher Lusty" <lu...@hinterland.ca>
To: "ICS support mailing" <twsocket@lists.elists.org>
Sent: Wednesday, February 26, 2014 1:53 PM
Subject: Re: [twsocket] Multiple TCp clients
Sorry about the incomplete explanation.
It turns out that I had made an error and I was not allowing devices to
respond every time before attempting to switch to another device - problem
solved
It turns out that instrument response (every command is echoed back from
the instrument along with status information) to a command is sometimes
slow (up to 7 seconds) when I switch between instruments but this could
well be an instrument issue - for that, I have to visit with the
manufacturer, they have more sophisticated testing equipment.
Many thanks to all for the help.
Lusty
-----Original Message-----
From: François Piette
Sent: Tuesday, February 25, 2014 1:52 PM
To: 'ICS support mailing'
Subject: Re: [twsocket] Multiple TCp clients
By 'bogged down' I mean that I can send and receive, alternating
instruments but eventually
the instruments (or the software) stop working correctly
You have to better described "stop working correctly" if you want to
significant help. What happens (or doesn't)? Is there any error code or
exception? Put breakpoint, add display messages and all kind of debugging
stuff.
Do you have a postcard from Orillia, Ontario, Canada yet?
Honestly, I can't tell you: I have received more than 4000 postcards for
ICS registration. Send yours :-)
--
francois.pie...@overbyte.be
Embarcadero MVP
http://www.overbyte.be
http://francois-piette.blogspot.com
-----Message d'origine-----
De : TWSocket [mailto:twsocket-boun...@lists.elists.org] De la part de
Christopher Lusty
Envoyé : mardi 25 février 2014 19:27
À : ICS support mailing
Objet : Re: [twsocket] Multiple TCp clients
Thank you Francois,
I was considering trying the array but wasn't sure that it would improve
my results - having a single event handler is an excellent idea.
By 'bogged down' I mean that I can send and receive, alternating
instruments but eventually the instruments (or the software) stop working
correctly - my guess is that using only one OndataReceive event will so a
long way to resolving this
Do you have a postcard from Orillia, Ontario, Canada yet?
Regards
Lusty
-----Original Message-----
From: François Piette
Sent: Tuesday, February 25, 2014 1:07 PM
To: 'ICS support mailing'
Subject: Re: [twsocket] Multiple TCp clients
Hello Chris,
Don't use TWSocketServer.
You should create an array (or a list or any collection you like) or
TWSocket components. Then connect each TWSocket to his own instrument. You
may use the same event handlers for all the TWSocket, simply use the
Sender argument in each event to now who is who. All the sockets will work
in parallel without any problem, without using thread and without
requiring any synchronization with GUI components.
If I leave both instruments connected the system runs for a bit but
eventually gets bogged down.
Not sure by what you mean by "bogged down". Ru your app under the debugger
and report any exception. Also use madExcept to catch many errors with
memory allocation and things like using freed objects and so on.
--
francois.pie...@overbyte.be
Embarcadero MVP
http://www.overbyte.be
http://francois-piette.blogspot.com
-----Message d'origine-----
De : TWSocket [mailto:twsocket-boun...@lists.elists.org] De la part de
Christopher Lusty
Envoyé : lundi 24 février 2014 22:38
À : twsocket@lists.elists.org
Objet : [twsocket] Multiple TCp clients
Hello all,
I am trying to interface with some laboratory instruments, previously we
used RS-232, now we are working on the next generation of machines
The instruments act as servers, I have established reliable communications
with each of the instruments as individual units using WSocket as a
client.
Now, I would like to set it up such that I can talk to each instrument in
turn (it is never necessary to talk to more than one machine at a time).
As an experiment I have built a small app with two TWServers on board,
each
is connected to buttons to dis/connect, send the contents of an edit box
and
place the results in a memo. Each client represents a different
instrument.
The setup works reasonably well if I connect-send-disconnect each
instrument
in turn. If I leave both instruments connected the system runs for a bit
but
eventually gets bogged down. I have no problem with having to make and
break
when I switch machines except for the fact that sometimes the reconnect
can
take a few seconds which, of course, slows things.
Any suggestions for this TCP newbie as to how to use multiple clients
within
one piece of software would be greatly appreciated. I’d like to avoid
threading.
BTW – compiler is Delphi 7 (soon to be ported to XE2)
Best regards
Chris Lusty
(first time poster)
C.W. Lusty, PEng MBA
Hinterland Software Ltd.
Software manufacturers for the PC-Titrate family of products
www.titrate.com
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