UDP client
lazarus / 38-Networking and Web Programming

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michoux · 2019-09-06 06:34

Hello,

I have an application that sends some UDP packets over network - I can
tell the APP to which IP data will be sent.
I would like to get this packets read in Lazarus. Any recommendations
where to start?

Thanks a lot. Michoux

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Thaddy · 2019-09-06 07:05

Look here for a good and simple example using synapse:
https://stackoverflow.com/questions/9786011/delphi-synapse-udp-client-
server
This also works cross-platform with Freepascal with the latest
synapse.

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michoux · 2019-09-06 07:58

Hello,

Thanks, good example.
But what bothers me is that read is done on timer.
I can not know when packet will be sent from other app.

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Remy Lebeau · 2019-09-06 19:44

Quote from: michoux on September 06, 2019, 09:58:08 amBut what bothers
me is that read is done on timer.
I can not know when packet will be sent from other app.

Then simply do the read in a worker thread instead.

Indy has a TIdUDPServer component that does the reading for you using
an internal worker thread, and then fires an OnUDPRead event whenever
a packet arrives.  You can choose whether that event is fired in the
context of the UI thread or the reading thread.