LUA Version/ Platform Information

[JC]

Hi Folks,

I am coding using windows Lua Player. I want to display battery/memory information. The following works on my PSP but not on windows:

Code: Select all

screen:print (10,10,"battery: " .. System.powerGetBatteryLifePercent(),Color.new(255,255,255))
screen:print (10,30,"Free Mem: " .. System.getFreeMemory(),Color.new(255,255,255))

screen.flip()
screen.waitVblankStart()

pad = Controls.read()
while not pad:start() do
  pad = Controls.read()
end

When I run this with the windows Lua player I get the following error:
error: sysinfo.lua:4: attempt to call field `getFreeMemory' (a nil value)

So it looks like the getFreeMemory function is not support under windows. Fair enough I don't really need it supported under windows. That said I would like to be able to run this code under windows. Is it possible to tell what version/platform the lua player is so I could do something like

Code: Select all

if System.Platform() == "windows" then 
    FreeMem = 0
else 
   FreeMem = System.getFreeMemory()
end 

screen:print (10,30,"Free Mem: " .. FreeMem ,Color.new(255,255,255))

Thanks,
JC

[Altair]

I dont know if you can check what platform its on, but I know "_VERSION" holds the interpreters version. You could check it anyways to make sure :)

[JC]

_VERSION returns LUA 5.0.2 on both windows and PSP.

Another thought I had was maybe I could suppress the error message, is that possible ?

[romero126]

perhaps since LUA checks for commands first

Check if they exist! as variables

if (System.powerGetBatteryLifePercent) then
do it here!

end

[be2003]

or change it up a bit, make a quick check at the beginning of the app to see what os it is on

currentos = ""
if System.powerGetBatteryLifePercent() then
currentos = "psp"
else
currentos = "pc"
end

and use the current os in all processes

function getPercent()
if currentos == "psp" then
return System.getBatteryLifePercent()
else
return "100"
end
end

[JC]

Thanks guys,

Both your suggestions will enable me to acheive what I want.