On 3/20/07, ?tienne Bersac <bersac...@laposte.net> wrote: > Hi allan, > > > it would be nice if some of the linux gnome devels would engage in > > SANE discussions on the SANE lists. they might learn something about > > the hardware they are trying to support :) button handling comes up > > here quite a bit, you should search the archives of the sane-devel and > > sane-standard mailing lists. > > You know i'm contributing to this list. The discussion on Gnome derived > to SANE and thus, land here. Don't threat a Gnome devels complot ;P
just trying to make sure you guys were paying attention :) > > > 1. you need a piece of code that understands the button-reading > > protocol for every scanner that sane supports. you will end up > > replicating a fair bit of code that is already (hopefully) in > > sane-backends, esp. for devices that require a bit of initialization > > before they can communicate. > > ACK. I really don't want to have "buttons monitor backends" and > "acquisition backends". That's crazy to maintain. The HAL add-on will > use SANE and provide two dbus method (e.g. Reclaim and Release) in order > to transmit device ownership. > > > 2. what happens when the user fires up scanimage command line tool > > without pressing any buttons? how do we deal with the contention for > > the device? > > Don't use HAL :). > so now every linux distro that enables HAL support in SANE, locks their users out of the most commonly used frontend, just to get button support? i would rather see a more general, non-linux specific method of handling buttons. how about a daemon that runs, gets the sane device list in the normal way, and then monitors each of the found devices for button presses as regular sane options. when a press is found, and there is a configured event to run, it sane_close() that device and fork/exec another frontend, passing it the device name as an arg. when the child exits, the daemon could regrab? on linux, sane_get_devices and other such functions might have the ability to use a more advanced device finding capability? allan -- "The truth is an offense, but not a sin"
