[sane-devel] gt68xx - sane_open() afrer sane_close()

[Aleksandr Dezhin]

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.
>>
>> --
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>
>