Frame.c build on Frame.b

os.loadApi("Frame.b")
c = {}
c.t = {}
c.c = {}
c.b = {}
MaxX,MaxY = 51,19
local function tT(x,y)
   if x < 100 then
      local a = "0"..x
   elseif x < 10 then
      local a = "00"..x
   else
      local a = x
   end
   if y < 100 then
      a = a.."0"..x
   elseif y < 10 then
      a = a.."00"..x
   else
      a = a..x
   end
   return a
end
function import(x,y)
   Frame.b.exportString(x,y)
   c.t[tT(x,y)] = istring:sub(1)
   c.c[tT(x,y)] = istring:sub(2)
   c.b[tT(x,y)] = istring:sub(3)
   istring = nil
end
function importArea(x1,y1,x2,y2)
   if x1 > 0 and x1 < x2 and y1 < 0 and y1 < y2 and x2 < MaxX and y2 < MaxY then
      while y1 < y2 + 1 do
         while x1 < x2 + 1 do
            import(x1,y1)
            x1 = x1 + 1
         end
         y1 = y1 + 1
      end
   else
      error("ivalid range")
   end
end