Sockets (again)

[Phil Davis]

Bob -

Don't use EOF. It's broken since forever ago.

I've done both of the following methods with success:

-- either --

End your data stream with a CR, and then on the receiving end "read from 
socket XYZ for 1 line". This assumes that the data stream itself doesn't 
contain any CRs. I normally base64-encode the data stream, then replace 
CR with empty in the encoded string. This doesn't interfere with 
base64Decoding on the receiving end - it'll still work fine.

-- or --

Make line 1 of your data stream an integer that is the number of bytes 
in line 2 of your data stream
Make line 2 of your data stream the data you want to send

Then on the receiving end, do a two-step:
- read from socket XYZ for 1 line
- put it into tDataLength
- read from socket XYZ for tDataLength bytes


That's all I got :-)
Phil Davis



On 4/4/23 1:47 PM, Bob Sneidar via use-livecode wrote:
> I have sockets working in my File Server Agent, but only using non-blocking calls, that is using "with message". Removing the "with message" bit does not return any response from the server agent.
>
> For instance I send a payload using
> write payload to socket tSocket with message "messageReceived"
> The messageReceived handler gets triggered, and I can then
> read from socket tSocket until EOF -- or other delimiter
> it will then contain the response from the File Server Agent.
>
> If however I use
> write payload to socket tSocket -- blocking
> read from socket tSocket until EOF -- or some other delimiter doesn't matter
>
> the call times out and nothing ends up in the it or result variables.
>
> I can (and have) made the non-blocking method work, but that means I have to send all the files I want to transfer all at once, because if I send them one at a time, I need to know if the last transfer succeeded before continuing.
>
> Does anyone have an example of a blocking socket server? The example in Livecode Lessons really only focuses on non-blocking calls.
>
> Bob S
>
>
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-- 
Phil Davis
(503) 307-4363