Known factors:
1. I don't know what size message will be returned.
2. The message always ends in CR LF
3. The message is always printable ASCII (not Unicode).
Date: Thu, 4 Dec 2008 09:48:52 +1300From: [EMAIL PROTECTED]: [EMAIL PROTECTED]:
Re: [DUG] Indy Sockets - How to Receive AsynchronouslyAlso, I guess the type of
data and your message layer has a big impact on how you design your data
receiver.
in my own client/servers where I control the protocol, all my messages first
send an 8byte size packet.. So my read queue is constantly just doing ASize :=
StrToInt( '$'+ReadString(8) ) { 8 byte hex } and this is looping.. as soon as I
get a successful size I can then read the specific size of data into a message
object and continue polling. If I need to send very large data like binary
files,, I break it down into smaller packets encapsulated in messages using the
above method.
On Thu, Dec 4, 2008 at 9:31 AM, Eric A <[EMAIL PROTECTED]> wrote:
Kyley, No program design yet. Questions: 1) Inside the thread - do I have to
implement a timer event to periodically check the buffer (since there's no
"data received" event)? 2) What properties do I read to determine if there's
received data available? 3) Do I need to use another Indy component in
conjunction with the TCPClient for the buffering etc? Paul, I'll take a look
at that site. Are you using ICS extensively? Thanks,Eric
Date: Thu, 4 Dec 2008 09:21:03 +1300From: [EMAIL PROTECTED]: [EMAIL PROTECTED]:
Re: [DUG] Indy Sockets - How to Receive Asynchronously
Indy is blocking, so typically on the client side, you would create a waiting
thread that you sit the TCPClient inside and loop a readtimeout until the
resultbuffer has some data. At that point produce a local event so that your
main thread can grab the TCPClient and read the information.
without knowing your actual program design and how your TCP layer interacts
with your main application its hard to offer any detailed advise, sorry.
On Thu, Dec 4, 2008 at 9:14 AM, Paul <[EMAIL PROTECTED]> wrote:
Indy works blocking only
Use ICS instead, they work blocking or non blocking.
check www.overbyte.be
Paul
----- Original Message -----
From: Eric A
To: Delphi UsersGroup
Sent: Wednesday, December 03, 2008 8:55 PM
Subject: [DUG] Indy Sockets - How to Receive Asynchronously
I have a situation where I need to communicate with a communications server
using Indy TCP sockets. After sending the command the server returns an "OK"
response with a second or two to acknowledge the acceptance of the command,
however the reponse from the end device (returned via the server) may take
several minutes to eventuate (or a else the sever returns a timeout message).
I need to be able to buffer the responses, be aware of when new strings
arrinve, and carry on with other tasks. This threading aspect shouldn't be an
issue as I understand that Indy is naturally multitrheaded by design. I'm not
familiar with using the Indy sockets and since there's no "received data event"
(due to the nature of the design) I'm wondering how I capture the asynchronous
responses sensibly? Does anyone have some code to show me how to use the Indy
10 TCPClient component in this way (for the receive part) ? Its probably
pretty simple but I need to get my head around it quickly. Thanks Eric
Start searching now Rental properties galore.
_______________________________________________NZ Borland Developers Group -
Delphi mailing listPost: [EMAIL PROTECTED]:
http://delphi.org.nz/mailman/listinfo/delphiUnsubscribe: send an email to
[EMAIL PROTECTED] with Subject: unsubscribe
_______________________________________________NZ Borland Developers Group -
Delphi mailing listPost: [EMAIL PROTECTED]:
http://delphi.org.nz/mailman/listinfo/delphiUnsubscribe: send an email to
[EMAIL PROTECTED] with Subject: unsubscribe-- Kyley HarrisHarris
Software+64-21-671-821
MSN NZ Travel Get inspired - dream, research, plan and book your next holiday
online with _______________________________________________NZ Borland
Developers Group - Delphi mailing listPost: [EMAIL PROTECTED]:
http://delphi.org.nz/mailman/listinfo/delphiUnsubscribe: send an email to
[EMAIL PROTECTED] with Subject: unsubscribe-- Kyley HarrisHarris
Software+64-21-671-821
_________________________________________________________________
Get inspired - dream, research, plan and book your next holiday online with MSN
NZ Travel
http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Ftravel%2Emsn%2Eco%2Enz&_t=771497011&_r=MSN_NZ_travel_hmtagline&_m=EXT_______________________________________________
NZ Borland Developers Group - Delphi mailing list
Post: [email protected]
Admin: http://delphi.org.nz/mailman/listinfo/delphi
Unsubscribe: send an email to [EMAIL PROTECTED] with Subject: unsubscribe
