[DUG] progress callback

[Phil Middlemiss]

Without knowing anything about Datasnap or any other kind of middle ware 
you may be using (therefore this may be inappropriate or not the best 
way), I can think of a couple of ideas.

1) If you are using TCP/IP for communicating then just leave the 
connection open and send an update every second or so for the client to read

2) Whether you are using TCP/IP or not you could query the middle-ware 
every second or so, passing it an ID for the operation that you 
retrieved when it was initiated.

Either way, I think you will end up having to think about threading issues.

Hope I haven't misunderstood what you are asking.

Phil.

Alister Christie wrote:
> I'm in the process of porting a desktop BDE application to a multier 
> application (still using the BDE currently).  I'm using the standard 
> Datasnap stuff available in Delphi to do so (remote datamodules, 
> clientdatasets, providers etc...).  Some of the processes I want to 
> shift into the middle tier can take minutes to process and was 
> wondering how to display a progress bar while things are working in 
> the background.  I presume some sort of callback procedure would be 
> required so that the application can be updated from the middle tier 
> as to the progress of the operation.  Can anyone point me in the right 
> direction?
>
> Alister Christie
> Computers for People
> Ph: 04 471 1849 Fax: 04 471 1266
> http://www.salespartner.co.nz
> PO Box 13085
> Johnsonville
> Wellington
> _______________________________________________
> Delphi mailing list
> Delphi at ns3.123.co.nz
> http://ns3.123.co.nz/mailman/listinfo/delphi
>
>
>
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