Hi,
On 2006-01-18 00:08, Lorenzo Delana wrote:
> I have a Mustek BP 1200 CU PLUS scanner A4, that
/proc/bus/usb/devices
> describe as:
I have the same scanner and it works flawlessly. Also many
others use
this scanner.
> 1) I installed cvs version of sane-backend and when I
use scanimage the
> problem go in Segmentation Fault;
> to solve this I have to add a NULL POINTER check on the
line 461 of the code
> so that:
I assume this is in sanei/sanei_usb.c?
> -------------
> case USB_CLASS_PER_INTERFACE:
> if
(dev->config[0].interface[interface].altsetting)
> switch
(dev->config[0].interface[interface].altsetting[0].
> bInterfaceClass)
> {
> ----------------
> This because altsetting something got me a NULL, then
altsetting[0] is
> dereferencing a null pointer.
How can altsetting[0] be 0? This means that an interface
exists but no
altsetting. I'm not that used to the USB spec but I would be
surprised
if this is allowed. Anyway, if your scanner does this, it
can't scan
because it's broken. I rather assume that it happens with
some other
device connected to your USB. Could you try to find out
which device
behaves this way? And please send a log with USB debugging
enabled:
SANE_DEBUG_SANEI_USB=255 scanimage -L
As an alernative to a strangely acting device, there could
be a
problem with libusb. However, this is the first time I hear
about such
trouble.
I'll add some checks for altsetting !=0 to sanei_usb as they
don't
harm. But I think the problem is somewhere else.
> 3) as for 1) in tools/sane-find-scanner.c at line 627
Could you send the output of "sane-find-scanner -v
-v", please?
> 4) at backend/gt68xx_high.c
> I have commented out the check for the status, because
in this point the
> program blocks forever ( for my scanner ). changing
status = SANE_STATUS_GOOD
> for quickly replacement.
Which status exactly? Which line of the code? Please send a
log file
of a scan where it blocks (without your change).
Bye,
Henning
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