[ANN] lua-evdev: interact with input devices on Linux
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- Subject: [ANN] lua-evdev: interact with input devices on Linux
- From: Joseph Wallace <tangent128@...>
- Date: 2014年8月19日 01:30:47 -0400
Hello, all;
I'm happy to announce a simple Lua 5.2 module I put together for using
the Linux evdev (EVent DEVice) and uinput (User-mode Input) APIs.
This can be useful for reading data from drawing tablets, game controllers,
as well as emulating keyboards, mice, tablets, and controllers.
The "Device" object is suitable for polling by cqueues if you like that
event loop,
but there are no special dependencies.
You can get it by installing the "evdev" rock,
or find the source and fuller documentation at
https://github.com/Tangent128/lua-evdev/tree/evdev-1.0
Here's hoping somebody else can have fun with it!
Example: Reading events from /dev/input/event* nodes:
---
local evdev = require "evdev"
-- (assuming event0 is the keyboard today)
local keyboard = evdev.Device "/dev/input/event0"
while true do
local timestamp, eventType, eventCode, value = keyboard:read()
if eventType == evdev.EV_KEY then
if eventCode == evdev.KEY_ESC then
break
end
if value == 0 then
print("Key Released:", eventCode)
else
print("Key Pressed:", eventCode)
end
end
end
Example: Creating a fake mouse:
---
local e = require "evdev"
local fakeMouse = e.Uinput "/dev/uinput"
-- register supported events
fakeMouse:useEvent(e.EV_KEY)
fakeMouse:useEvent(e.EV_REL)
fakeMouse:useKey(e.BTN_0)
fakeMouse:useKey(e.BTN_1)
fakeMouse:useRelAxis(e.REL_X,-100,100)
fakeMouse:useRelAxis(e.REL_Y,-100,100)
fakeMouse:init()
-- inject a few events; mouse move, button press, button release
fakeMouse:write(e.EV_REL, e.REL_X, -50)
fakeMouse:write(e.EV_REL, e.REL_Y, 0)
fakeMouse:write(e.EV_SYN, e.SYN_REPORT, 0)
fakeMouse:write(e.EV_KEY, e.BTN_0, 1)
fakeMouse:write(e.EV_SYN, e.SYN_REPORT, 0)
fakeMouse:write(e.EV_KEY, e.BTN_0, 0)
fakeMouse:write(e.EV_SYN, e.SYN_REPORT, 0)
-- dispose
fakeMouse:close()
---
"Tangent"
Joseph Wallace