Also, I guess the type of data and your message layer has a big impact on how you design your data receiver.<div><br></div><div>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.<br>
<br><div class="gmail_quote">On Thu, Dec 4, 2008 at 9:31 AM, Eric A <span dir="ltr"><<a href="mailto:eaa603@hotmail.com">eaa603@hotmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>
Kyley,<br>
<br>
No program design yet. Questions:<br>
<br>
1) Inside the thread - do I have to implement a timer event to periodically check the buffer (since there's no "data received" event)? <br>
<br>
2) What properties do I read to determine if there's received data available? <br>
<br>
3) Do I need to use another Indy component in conjunction with the TCPClient for the buffering etc?<br>
<br>
<br>
Paul,<br>
<br>
I'll take a look at that site. Are you using ICS extensively?<br>
<br>
<br>
Thanks,<br>
Eric<br>
<br>
<br>
<br>
<br><br> <br>
<hr>
<br>
Date: Thu, 4 Dec 2008 09:21:03 +1300<br>From: <a href="mailto:kyleyharris@gmail.com" target="_blank">kyleyharris@gmail.com</a><br>To: <a href="mailto:delphi@delphi.org.nz" target="_blank">delphi@delphi.org.nz</a><br>Subject: Re: [DUG] Indy Sockets - How to Receive Asynchronously<div>
<div></div><div class="Wj3C7c"><br><br>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.<br>
<div><br></div>
<div>without knowing your actual program design and how your TCP layer interacts with your main application its hard to offer any detailed advise, sorry. <br><br>
<div>On Thu, Dec 4, 2008 at 9:14 AM, Paul <span dir="ltr"><<a href="mailto:paul.blommaerts@telenet.be" target="_blank">paul.blommaerts@telenet.be</a>></span> wrote:<br>
<blockquote style="padding-left:1ex;border-left:#ccc 1px solid">
<div>
<div><font face="Arial">Indy works blocking only</font></div>
<div><font face="Arial">Use ICS instead, they work blocking or non blocking.</font></div>
<div><font face="Arial">check <a href="http://www.overbyte.be/" target="_blank">www.overbyte.be</a></font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Paul</font></div>
<blockquote style="padding-right:0px;padding-left:5px;margin-left:5px;border-left:#000000 2px solid;margin-right:0px">
<div>
<div></div>
<div>
<div style="font:10pt arial">----- Original Message ----- </div>
<div style="background:#e4e4e4;font:10pt arial"><b>From:</b> <a title="eaa603@hotmail.com" href="mailto:eaa603@hotmail.com" target="_blank">Eric A</a> </div>
<div style="font:10pt arial"><b>To:</b> <a title="delphi@delphi.org.nz" href="mailto:delphi@delphi.org.nz" target="_blank">Delphi UsersGroup</a> </div>
<div style="font:10pt arial"><b>Sent:</b> Wednesday, December 03, 2008 8:55 PM</div>
<div style="font:10pt arial"><b>Subject:</b> [DUG] Indy Sockets - How to Receive Asynchronously</div>
<div><br></div>I have a situation where I need to communicate with a communications server using Indy TCP sockets. <br> <br>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.<br>
<br>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?<br> <br>
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.<br> <br>Thanks<br> <br>Eric<br>
<br>
<hr>
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