Failing for no reason

I get an Attempt to index ? (a function value) on line 5 for no reason

Code (screenshot API)

Spoiler

local term=term.native
local screen={}
screen.__index=term
setmetatable(screen,screen)
local w, h = term.getSize() –Erroring line #5
local blink=true
local color={}
color.text=colors.white
color.background=colors.black
color[2^0]="1"
color[2^1]="2"
color[2^2]="3"
color[2^3]="4"
color[2^4]="5"
color[2^5]="6"
color[2^6]="7"
color[2^7]="8"
color[2^8]="9"
color[2^9]="10"
color[2^10]="11"
color[2^11]="12"
color[2^12]="13"
color[2^13]="14"
color[2^14]="15"
color[2^15]="16"
local vscreen={}
vscreen.tcolor={}
vscreen.text={}
vscreen.bcolor={}

local function dtcolor() return 1 end
local function dbcolor() return 32768 end
local function dtext() return " " end

for y=0,h+1 do
vscreen.tcolor[y]={}
vscreen.text[y]={}
vscreen.bcolor[y]={}
vscreen.tcolor[y].__index=dtcolor
vscreen.text[y].__index=dtext
vscreen.bcolor[y].__index=dbcolor
setmetatable(vscreen.tcolor[y],vscreen.tcolor[y])
setmetatable(vscreen.text[y],vscreen.text[y])
setmetatable(vscreen.bcolor[y],vscreen.bcolor[y])
end

screen.write=function(_sText)
local x,y=term.getCursorPos()
for i=1,_sText:len() do
vscreen.text[y][x+i-1]=_sText:sub(i,i)
vscreen.tcolor[y][x+i-1]=color.text
vscreen.bcolor[y][x+i-1]=color.background
end
term.write(_sText)
end

screen.setTextColor=function(_nColor)
color.text=_nColor
term.setTextColor(_nColor)
end

screen.setTextColour=function(_nColor)
color.text=_nColor
term.setTextColour(_nColor)
end

screen.setBackgroundColor=function(_nColor)
color.background=_nColor
term.setBackgroundColor(_nColor)
end

screen.setBackgroundColour=function(_nColor)
color.background=_nColor
term.setBackgroundColour(_nColor)
end

screen.clear=function()
for y=1,h do
for x=1,w do
vscreen.text[y][x]=" "
vscreen.tcolor[y][x]=colors.text
vscreen.bcolor[y][x]=color.background
end
end
term.clear()
end

screen.clearLine=function()
local x,y=term.getCursorPos()
for x=1,w do
vscreen.text[y][x]=" "
vscreen.tcolor[y][x]=color.text
vscreen.bcolor[y][x]=color.background
end
term.clearLine()
end

screen.setCursorBlink=function(_bBlink)
blink=_bBlink
term.setCursorBlink(_bBlink)
end

screen.scroll=function(n)
if n > 0 then
for i=1,n do
for y=1,h do
for x=1,w do
vscreen.tcolor[y][x]=vscreen.tcolor[y+1][x]
vscreen.bcolor[y][x]=vscreen.bcolor[y+1][x]
vscreen.text[y][x]=vscreen.text[y+1][x]
end
end
end
else
for i=n,-1 do
for y=h,1,-1 do
for x=1,w do
vscreen.tcolor[y][x]=vscreen.tcolor[y-1][x]
vscreen.bcolor[y][x]=vscreen.bcolor[y-1][x]
vscreen.text[y][x]=vscreen.text[y-1][x]
end
end
end
end
term.scroll(n)
end

function get()
return screen
end

function takeScreenshot(_sPath)
local xp,yp=term.getCursorPos()
local file=fs.open(_sPath,"w")
file.write("{\\rtf1{\\fonttbl{\\f0\\fnil\\fcharset0 Courier New;}}{\\colortbl;\\red240\\green240\\blue240;\\red235\\green136\\blue68;\\red195\\green84\\blue205;\\red102\\green137\\blue211;\\red222\\green222\\blue108;\\red65\\green205\\blue52;\\red216\\green129\\blue152;\\red67\\green67\\blue67;\\red153\\green153\\blue153;\\red40\\green118\\blue151;\\red123\\green47\\blue190;\\red37\\green49\\blue146;\\red81\\green48\\blue26;\\red59\\green81\\blue26;\\red179\\green49\\blue44;\\red30\\green27\\blue27;\\red0\\green0\\blue0;}\\sa0")
local bcolor
for y=1,h do
for x=1,w do
bcolor=color[vscreen.bcolor[y][x]]
if bcolor=="16" then
bcolor="17"
end
if y==yp and x==xp and blink then
if vscreen.text[y][x]==" " then
file.write("\\cf"..color[vscreen.tcolor[y][x]].."\\highlight"..bcolor.." _")
else
file.write("\\cf"..color[vscreen.tcolor[y][x]].."\\ul\\highlight"..bcolor.." "..vscreen.text[y][x].."\\ulnone")
end
else
file.write("\\cf"..color[vscreen.tcolor[y][x]].."\\highlight"..bcolor.." "..vscreen.text[y][x])
end
end
file.write("\\highlight0\\par")
end
file.write("}")
file.close()
end

Also, Can someone PLEASE give me some kind of walkthrough on how taking a cc screenshot would work? :(/>

1)
term.native is a function, not a table. To receive the table you want, you must call that function:

term = term.native ()

The error message explains this too, you're "attempting to index (use as a table) a function"

2)
Overwrite all of term's functions to write to a buffer while still writing to the screen. When you want to take a screenshot, simply read the buffer.

1) thanks!
2) i have no idea how to do that, please explain

1) np
2) I would like to write an explenation here, but I'm on my phone right now and typing goes sloooow… Maybe you can take a look at this program to get an idea about how it's done?

It is important to note that term.native was a table until the version that added term.current() and changed how terminal redirecting worked.

Lyqyd, on 17 May 2015 - 05:43 PM said:

It is important to note that term.native was a table until the version that added term.current() and changed how terminal redirecting worked.

I figured it was enough to link him to the wiki page, thanks for the clarification though.

thanks for the effort, but that program's pastebin was 404

SOLVED thank you for the help