Richard Miller wrote:
The computer in question is not set up with networking.
I'm not sure if UDP on the same machine is prevented even without
external networking enabled. Maybe someone here can explain.
But if all you need is to pass some info from one app to another,
depending on the frequency of the exchange you may find using a file
isn't a bad option.
While it's true that accessing a file's contents is relatively slow,
that is relative. More importantly, checking for the existence of a
file is much faster than checking its contents, in many cases quite
acceptably so.
You could conceivably have the listening app check a folder in
specialFolderPath("temporary") for a file of a specific and
unlikely-to-be-used name (e.g., "MySpecialDataFile34583895"), using a
timer set for, say, once every half-second or so, depending on the
frequency you need (could be less, could be more; the less often it
checks the better of course).
The sending app would write to that file any time it needs to send info
to the other app, and the other app would see that it's there and if it
is then it reads it, deletes the file, and does whatever it needs with
the data:
on ListenForData
put (specialFolderPath("temporary")&"/MySpecialDataFile34583895" \
into tTempFile
if there is a file tTempFile then
put url ("file:"&tTempFile) into tMyData
delete file tTempFile
-- do something with the data here:
end if
send "ListenForData" to me in 500 millisecs -- half a second
end ListenForData
On a relatively slow Mac (1GHz G4) it takes about a quarter millisecond
to get the file name using specialFolderPath and check its existence.
If you get the file name only once and store it in a variable, the time
to just check for its existence drops to only 0.0165 ms:
local sTempFile
on InitListening
put (specialFolderPath("temporary")&"/MySpecialDataFile34583895" \
into sTempFile
ListenForData
end InitListening
on ListenForData
if there is a file sTempFile then
put url ("file:"&sTempFile) into tMyData
delete file sTempFile
-- do something with the data here:
end if
send "ListenForData" to me in 500 millisecs
end ListenForData
--
Richard Gaskin
Managing Editor, revJournal
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