4 replies to this topic

[gollark8]

I am trying to log my airship parking locations.

I have a gps system set up.When I try to run it,I get the error in the title.There is also a disk drive with a disk in it beside the computer.

local flightlog = fs.open("disk/flightlog")
while true do
local pos = gps.locate()
print(pos)
file.write(pos)
sleep(10)
end

Edited by gollark8, 14 December 2013 - 10:48 AM.

[MKlegoman357]

There are a few problems with your code:

1. fs.open takes 2 arguments: path to the file and in which mode to open that file (read, write, read bytes, etc.):

2. There is no file variable in your code. I think you meant flightlog.

3. gps.locate returns 3 variables: x, y and z coordinates of the computer.

Fixed code would look like this:

local flightlog = fs.open("disk/flightlog", "a") --// Open the file in append mode, so we could add text to the file.

while true do
  local x, y, z = gps.locate()
  local pos = x .. ", " .. y .. ", " .. z
  print(pos)
  flightlog.writeLine(pos) --// Write a line in the file
  sleep(10)
end

You also never close the file. You can close it by using the close method in the file handle:

flightlog.close()

--// When you close the file it is properly saved to the computer.
--// After you close it you can no longer use the file handle to read/write a file

[CoderPuppy]

You need to tell it what mode to open the file in:

fs.open("disk/flightlog", "w")

w for write
r for read

[Bomb Bloke]

fs.open() requires two parameters: A string, and another string.

Eg, fs.open("disk/flightlog","w")

Edit: lolninja

Edited by Bomb Bloke, 14 December 2013 - 11:18 AM.

[Ajt86]

If you want to locate a computer or turtle like a real GPS you could use three servers, and put all three distances in a GPS algorithm. Or you could log every single movement of the turtle (which wouldn't be real GPS)