Thanks, Richard. This was along the lines I was thinking. I'll see
how the performance works for our specific situation. We have a lot
going on in the main application while this "conversation" is taking
place between the two apps, but I think it will work fine.
Richard
On Dec 7, 2006, at 3:26 PM, Richard Gaskin wrote:
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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