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Author Topic: Obtaining available actions  (Read 797 times)

Nilwater

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Obtaining available actions
« on: December 02, 2013, 01:23:26 pm »

Hello!

I'm using Linux and trying to obtain all the current actions available to me in the game's current state.
For example at the default screen I would have these actions:
Code: [Select]
{ "Main" :
    { "a" : "View Announcements"
    , "b" : "Building"
    , "c" : "View Civilizations"
    , ... etc
    }
}

And if I press b to get the building menu I would simple get:
Code: [Select]
{ "Building :
    { "a" : "Armor Stand"
    , "b" : "Bed"
    , "c" : "Seat"
    , ... etc
    }
}
I've been trying to achieve this by reading the game's memory, however I am very unfamiliar with reading a process's memory and it proved to be very challenging.
Using scanmem I've been able to find simple things such as population count but I wasn't able to get even close to my actual goal.

Screen Scraping isn't really an option since font changes with tilesets and it doesn't seem like a clean solution.

If anyone has knowledge on how to tackle this problem, any help is appreciated. I'm not asking for someone to solve this problem for me, just any guidance or tips would help.

Thanks in advance!
« Last Edit: December 02, 2013, 01:44:41 pm by Nilwater »
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Quietust

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Re: Obtaining available actions
« Reply #1 on: December 02, 2013, 04:21:33 pm »

You aren't going to get anything useful from reading the game's memory because of how key bindings are implemented - what's actually going on is that each viewscreen has a special function which gets called for handling input, and those functions simply check for the keybindings they're meant to handle.

For an example, look at "interface.cpp" in the g_src folder (which is only present in the Linux version) and jump down to the "viewscreen_movieplayerst::feed" function.

The only way to do this reliably would be to detect the currently active viewscreen and its current state (which can be done using DFHack) and then look up the keybindings used there from a static list which you would prepare in advance.
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Nilwater

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Re: Obtaining available actions
« Reply #2 on: December 02, 2013, 07:23:12 pm »

Thanks a lot! That's exactly what I was looking for. Now I can use this in conjunction with dfhack-run. I'd probably want to integrate it into a plugin but dfhack-run will do the trick for now.
Thanks again!
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Quietust

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Re: Obtaining available actions
« Reply #3 on: December 02, 2013, 09:09:15 pm »

"dfhack-run" is nothing more than an alternative to running commands from the DFHack console, and commands can only come from plugins (C++) and scripts (Lua or Ruby).
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It's amazing how dwarves can make a stack of bones completely waterproof and magmaproof.
It's amazing how they can make an entire floodgate out of the bones of 2 cats.