#7 data uncaptured?
Hi,
I want to use Snoopy to trap data sent from my USB
slide scanner to the twain device driver before it send it
to the graphic application. I suspect the driver
makes "something" to the image. When it gets the
application it has some corrections I dont like and
cannot avoid. I should have spent more money on it, its
a dumb scanner (and maybe a dumb buyer...!).
I was able to trap the USB port and get a file with
some structure and protocols, but what seems to be
chunks of data doesnt change using very differnet slides
(a white and a black one, for instance). Moreover, the
log file is about 5 MB where it should be at least 22 MB
(the size of the image, 3372*2244*3colors=22700304 b
ytes). The log file size changes with scanning resolution
(as it should be), but it is always much smaller than the
raw data it is supposed to be transmitted. There could
be a compression layer somewhere, but It should give
different bytes for different slides, at least.
I tried the same procedure with my webcam, and the
logfile doesnt look different with without light in the
camera either...
Is possible the program is discarding some data or
recording it in another place?
Therer is also a little problem with select "all going
down" or "up" transactions. When I ask cut, it selects
and cuts well, but when it pastes on a new window, it
copies everything again, not what it was cutted.
Although the number of packets copied in the new file
is about half of the original amount. It seems that it cuts
the first half in the list, not the "ups" or "downs".
Thanks for the time,
Alejandro
aleparise@hotmail.com
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I'm getting the same behaviour here. While capturing data from my
scanner SnoopyPro stops at some point to capture data. This is
before the actual image data is transmitted. It always seems to stop
at the same point in the log.
I've re-run the test with usbsnoop 1.8 available from
http://benoit.papillault.free.fr/x-stats/get.php?location=../usbsnoop/sniff-bin-1.8.zip
- the log produced with this tool contains all data, including the
image data.
Logs are available on request
-Oliver
oliverschwartz@users.sourceforge.net