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{i} This page state about a scanner service in freedesktop. This document was started off a discussion at xdg mailing list : [[http://lists.freedesktop.org/archives/xdg/2007-January/009074.html|http://lists.freedesktop.org/archives/xdg/2007-January/009074.html]]
## Goals
* Monitor buttons
* Share devices
These feature imply that the software own the device handle, this is why the software expose acquisition API.
* Acquire image
## Achievement
This can be done through a dbus system wide daemon.
## DBus API
This is a rough draft of an API -- [[EtienneBersac|EtienneBersac]] 2007-01-28 22:21:45
* device_list [[GetDeviceList|GetDeviceList]]
* string [[GetDeviceInfo|GetDeviceInfo]] (device)
* option_list [[GetDeviceOptions|GetDeviceOptions]] (device)
* [[ShareDevice|ShareDevice]] (device, boolean)
* job [[StartScan|StartScan]] (device, settings)
* [[StopScan|StopScan]] (job)
* [[GetImage|GetImage]] (job)
/!\ How to monitor ? How to get buttons events ? How should the image be transferred back to the client?
* A file descriptor or device node might be one way for transferring the image quickly (sending it directly over D-BUS definitely wouldn't work).
Signals :
* device-plugged (device)
* device-unplugged
* button-pressed (device, button)
* job-done (job)
## Scanner access
Scanner access is done through the famous SANE library. Hope that HAL & SANE will work better together in the future in order to get devices from HAL.
## Sharing
SANE has a net scanning protocol. However, it shows some limitation (basically, it's too slow for huge image). What to do ?
* It would be nice to come up with a new protocol for this like the D-BUS one, maybe with some kind of compression, like bzip2. I wouldn't worry about breaking compatibility. -- [[DonaldStraney|DonaldStraney]]
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