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Daemon script

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Offline HrClausen

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Daemon script
« on: 09 / April / 2015, 16:30:55 »
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I am working on an application where I generally want the camera to work as normal as possible, with the possibility of a script spying/intervening at selected hook-points.

It seems that whenever I run a script, it takes full control over the camera. Is it possible to run the script as a daemon?
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Offline reyalp

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Re: Daemon script
« Reply #1 on: 09 / April / 2015, 16:51:49 »
Quote from: HrClausen on 09 / April / 2015, 16:30:55
I am working on an application where I generally want the camera to work as normal as possible, with the possibility of a script spying/intervening at selected hook-points.

It seems that whenever I run a script, it takes full control over the camera. Is it possible to run the script as a daemon?
Not really, but you can write a script that passes most key presses through to the canon firmware. The test script posted in http://chdk.setepontos.com/index.php?topic=12244.0 and the contae script posted in http://chdk.setepontos.com/index.php?topic=11081.msg120840#msg120840 are examples.

Note that you cannot pass keys to CHDK in the same way, you would need to exit the script to interact with CHDK menus.
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Offline waterwingz

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    • Waterwingz
Re: Daemon script
« Reply #2 on: 09 / April / 2015, 19:44:24 »
Quote from: HrClausen on 09 / April / 2015, 16:30:55
Is it possible to run the script as a daemon?
Well, technically it's possible to have a script exit CHDK <ALT> mode and run while the camera is in "normal" operations mode.   The script can also re-enter <ALT> mode.   See exit_alt()  and enter_alt().

Here's a simplistic example :
Code: [Select]
--[[
@title daemon
@chdk_version 1.3
--]]
i=1
sleep(1000)
exit_alt()
repeat
   sleep(1000)
   draw_string(50, 50, i , 257, 258, 2)
   i=i+1
until false

But as reyalp will be quick to point out,  that's a mode where the script and camera behavior is somewhat undefined.    So you would have to try that at your own risk.
« Last Edit: 09 / April / 2015, 20:06:32 by waterwingz »
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Offline HrClausen

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Re: Daemon script
« Reply #3 on: 29 / April / 2015, 18:06:01 »
I made a small framework for this.

http://chdk.setepontos.com/index.php?topic=12351.new#new

So far I have only tried it wit a small demo example. But it seems to work neatly.

/HrClausen
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