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Date: Thu, 4 Dec 2008 09:48:52 +1300<BR>From: kyleyharris@gmail.com<BR>To: delphi@delphi.org.nz<BR>Subject: Re: [DUG] Indy Sockets - How to Receive Asynchronously<BR><BR>Also, I guess the type of data and your message layer has a big impact on how you design your data receiver.<BR>
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<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=EC_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>
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<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>
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<BR>Date: Thu, 4 Dec 2008 09:21:03 +1300<BR>From: <A href="mailto:kyleyharris@gmail.com">kyleyharris@gmail.com</A><BR>To: <A href="mailto:delphi@delphi.org.nz">delphi@delphi.org.nz</A><BR>Subject: Re: [DUG] Indy Sockets - How to Receive Asynchronously
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<DIV class=EC_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>
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<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">paul.blommaerts@telenet.be</A>></SPAN> wrote:<BR>
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<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/">www.overbyte.be</A></FONT></DIV>
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<DIV><FONT face=Arial>Paul</FONT></DIV>
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<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">Eric A</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=delphi@delphi.org.nz href="mailto:delphi@delphi.org.nz">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>
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