On Tue, Feb 9, 2010 at 6:24 AM, Josh Mellicker <[email protected]> wrote:
> We have been experimenting with many combinations of syntax variants for
> "open process"/"read from process" to communicate with various command-line
> driven executables.
>
> We are using a callback loop to read from process, and have tried from 1 to
> 800 milliseconds to try and speed up response.
>
> We have tried read from process until lf, until cr, until eof, until empty,
> etc.
>
> Things are working, but there is always about a 4 - 5 second latency in the
> "read from process". Usually this doesn't matter, but in our current project
> it needs to be within a second or less.
>
>
> So, I am wondering:
>
> 1. Is there something we could do to eliminate this delay, some syntax we
> haven't yet tried?
>
> 2. Have other developers noticed this latency in the Rev I/O pipeline?
>
> 3. Would writing an Rev external that served as a middleman between Rev and a
> command-line driven executable eliminate this problem and provide near real
> time communication?
>
> 4. Is there another way to communicate with command-line driven executables
> (other than "shell", which doesn't provide for a callback loop to monitor
> output)
I use shell with the output piped to a text file that I can monitor.
Here is an example script that I use for pinging:
function checkPing pIP
put specialFolderPath("Desktop") & "/ping.txt" into tFileName
if there is a file tFileName then delete file tFileName
put "ping -c1 -n " & pIP into tShellCmd
put " > " & tFileName & " 2>&1 &" after tShellCmd
get shell(tShellCmd)
put 0 into timeCheck
repeat 50 times
add 1 to timeCheck
wait 1 tick with messages
if there is a file tFileName then
put URL ("file:" & tFileName) into tRes
if tRes is empty then next repeat -- file created but no result yet
put wordOffset("loss", tRes) into tWord
if tWord = 0 then next repeat -- file created but result
not complete
-- if there is a file tFileName then delete file tFileName
put word tWord-2 of tRes into tPercent
if tPercent = "0%" then return true
else return false
end if
end repeat
if there is a file tFileName then delete file tFileName
return false
end checkPing
Cheers,
Sarah
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