Calling sane_get_devices() before each sane_open() something helps isolate the problem? I am trying to develop a program that works a dozen devices at the same time. Asurvey of all the devices at each operation seems to me something strange.
On 07/31/2012 06:23 PM, m. allan noah wrote: > It is possible that this is a bug in that backend. perhaps you should > call sane_get_devices again? > > allan > > On Tue, Jul 31, 2012 at 10:13 AM, Aleksandr Dezhin <me at dezhin.net> wrote: >> Hello, >> >> As I wrote, I'm trying to develop web interface for SANE. I am developing it >> using Python.I do not want to lock device so that other WSGI-proccess >> instances can access it. Atypical code flow is as follows: >> >> sane_init() >> sane_get_devices() >> >> // user selected device, showing page with capabilities >> sane_open(device_id) >> sane_get_option_description() >> sane_close() >> >> // user requested to scan page >> sane_open(device_id) >> sane_control_option() >> sane_start() >> sane_read() >> sane_cancel() >> sane_close() >> >> // program exitting >> sane_exit() >> >> Canon LiDE 210 with genesys backend or HPLIP works as expected, but Mustek >> Bearpaw 1200 CU Plus with gt68xx fails open_device() secondly, after >> sane_close(). If I skip first open()/close() - second block works correctly. >> What is this? Bug or feature? >> >> Sorry I can not give an example of a simple program in C. If it helps I can >> send a link to the repository with my application. It contains some modified >> version of the python C extension from pysane. >> >> Thanks. >> >> -- >> sane-devel mailing list: sane-devel at lists.alioth.debian.org >> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel >> Unsubscribe: Send mail with subject "unsubscribe your_password" >> to sane-devel-request at lists.alioth.debian.org > >
