In Revolution, which function is better for calling a long-running
external process and reading data from the process in a non-blocking
format, for instance, streaming the output from tcpdump into a text
display?
Looking at the docs, it appears that "process" is what I want, but I saw
something that says that "open process" on OS X is only useful for
launching applications...not launching background command-line processes
and reading their output to stdout as one would expect to do on a
Unix-style platform. Since I am targeting OS X, I need to know how
others handle this.
Getting to this thread a bit late, but here is how I do a ping without
blocking anything else. It is very quick if the ping is successful,
but it's the failure delay that has to be allowed for.
**********
on mouseUp
put checkPing("www.garbageaddress.com")
end mouseUp
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
**********
As you can see, I redirect the output of a shell command to a text
file, then have a loop that keeps checking until the file is there.
Because the loop uses "wait with messages", it doesn't stop anything
else from happening. After that, I analyze the text in the file to see
how successful the ping was, before deleting the file.
Depending on how long you would expect the command to take, you can
adjust the wait time inside the loop and the number of times the loop
happens.
Cheers,
Sarah
_______________________________________________
use-revolution mailing list
[email protected]
Please visit this url to subscribe, unsubscribe and manage your subscription
preferences:
http://lists.runrev.com/mailman/listinfo/use-revolution
