Re: Buffered-Unbuffered data in AS?
Re: Buffered-Unbuffered data in AS?
- Subject: Re: Buffered-Unbuffered data in AS?
- From: "Philippe GRUCHET" <email@hidden>
- Date: Thu, 04 Jul 2002 17:22:09 +0100
Hi!
Is there anybody else to do this test?
Thank you very much!
Strange.
I can read up to:
--start script
set theString to " 123456789ABCDEF"
repeat 6 times
set theString to theString & theString
end repeat
-- theString is now 1K characters or one block
set f to open for access file "Macintosh HD:foo.txt" with write permission
repeat 2975 times --and not 8192 times
write theString to f
end repeat -- f now contains 2.9Mb of data
close access f
try
set f to open for access file "Macintosh HD:foo.txt"
set s to read f
close access f
length of s -- result is 3046400 and not 8388608
on error
close access f
display dialog ,
"Out of memory" buttons "Quit" default button 1 with icon 2
end try
--end script
>
From: Chris Espinosa <email@hidden>
>
>
Could you verify that you're not just running into the Script Editor's
>
limitation on displaying data in the event log and results window? Our
>
internal testing shows that AppleScript is able to read much larger
>
files -- the following test worked up to 16Mb but failed (woth an
>
out-of-memory error) at 32Mb:
>
>
set theString to " 123456789ABCDEF"
>
repeat 6 times
>
set theString to theString & theString
>
end repeat
>
-- theString is now 1K characters or one block
>
set f to open for access file "Macintosh HD:foo.txt" with write
>
permission
>
repeat 8192 times -- change this number
>
write theString to f
>
end repeat -- f now contains 8Mb of data
>
close access f
>
>
set f to open for access file "Macintosh HD:foo.txt"
>
set s to read f
>
close access f
>
length of s -- should be 8388608
>
>
Chris Espinosa
>
Apple
>
> Right!
>
> I've just found a size limit: lower than 20K from an external data
>
> fork.
>
> From 20K, AS doesn't handle buffered data correctly.
>
> And from inside the Script Editor (events window), we can see that
>
> data are not loaded at all!
>
>
>
> So, from 20K and more, data must be cut into segments.
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