[HELP] String variable

Hello everyone.

I trying to read lines from one file. This certain file have:
FIRST FILE

Hayden
Joao
Maria
Urso

And so on… because i can add more names if i want.

In my program, i need to read this lines to compare with the name in the file inside de Floppy disk:
Lets think in this example, this variable

ler = "Hayden"

Ok…

Now i want to compare with the first file if the variable "ler" is inside in any of the lines of the "FIRST FILE".

hFile = fs.open("configs/gerentes", "r")
	 repeat
		  texto[i] = hFile.readLine()
		  i = i + 1
	 until texto[i] == "" or lines[i] == nil -- THIS LINE IS GIVING ERROR!
   hFile.close()

   for k, v in pairs(lines) do
	 if lines[v] == "--bler" then
		   lines[v] = ""
	 end
   end

if ler == v then
	-- continue etc...

I am getting error in this line:

texto[i] = hFile.readLine()

Well, you didn't give the exact error line, but the two only possible errors with this line are both "Attempt to index nil"
It's either because you haven't declared the texto table anywhere, add texto = {} somewhere at the top of your code,
or hFile is nil, meaning "configs/gerentes" can't be opened.

Anavrins, on 27 April 2016 - 01:48 AM said:

Well, you didn't give the exact error line, but the two only possible errors with this line are both "Attempt to index nil"
It's either because you haven't declared the texto table anywhere, add texto = {} somewhere at the top of your code,
or hFile is nil, meaning "configs/gerentes" can't be opened.

Look again. Error updated.

Anavrins correctly guessed your issue. Either texto or hFile is nil.

You've now got two lines in your post saying different lines in the code are erroring. You're still failing to quote the actual error.

I notice you're trying to treat "lines" as a table. That'll fail for the exact same reason treating "texto" as a table will fail - you haven't declared either as such. It looks like you only want to use one of the two variable names.

Even if you fix that, your logic is still broken in that you're trying to compare against "v" outside of the loop "v" is localised to. You'd need to do it inside the "for" loop that iterates through lines/texto/whatever.

FWIW, I'd write things like this:

local ler, found = "Hayden", false

for line in io.lines("configs/gerentes") do
	if line == ler then
		found = true
		break
	end
end

if found then ...

Bomb Bloke, on 27 April 2016 - 02:24 AM said:

You've now got two lines in your post saying different lines in the code are erroring. You're still failing to quote the actual error.

I notice you're trying to treat "lines" as a table. That'll fail for the exact same reason treating "texto" as a table will fail - you haven't declared either as such. It looks like you only want to use one of the two variable names.

Even if you fix that, your logic is still broken in that you're trying to compare against "v" outside of the loop "v" is localised to. You'd need to do it inside the "for" loop that iterates through lines/texto/whatever.

FWIW, I'd write things like this:

local ler, found = "Hayden", false

for line in io.lines("configs/gerentes") do
	if line == ler then
		found = true
		break
	end
end

if found then ...

I've tryied this:

hFile = fs.open("configs/gerentes", "r")
	 for line in hFile.readLine() do -- ERROR IN THIS LINE
		  if line == ler then local passou = true end
   hFile.close()

but the error is:

attempt to call string

Sticking an iterator function into a "for" loop doesn't work like that. You have to specifically provide a function - io.lines() returns one, hFile.readLine() doesn't. Hence if you wanted to do things that way, you'd provide the function pointer itself without calling it yourself:

local ler, passou, hFile = "Hayden", false, fs.open("configs/gerentes", "r")

for line in hFile.readLine do  --# Note lack of brackets; function is called by the loop itself.
	if line == ler then
		passou = true
		break
	end
end

hFile.close()

if passou then ...

Hello people.

How can i read each line in a file and save as in variable, dont creating each variable to each line, because the lines can be multiple.
Example:

FILE 1:

Hayden Almeida
Tio cocota
Maria

and the program i am executing, i want to save each line separetly.

Atention: the "FILE 1" can contain more then these 3 names… so i need a loop to read until dont have more names in it.

Something like

local file = fs.open(path, "r")
local lines = {}
for line in file.readLine do
  table.insert(lines, line)
end

Will result in the lines table containing each lines of your file, lines[1] will contain "Hayden Almeida", lines[2] will have "Tio cocota", etc…

Anavrins, on 27 April 2016 - 06:07 PM said:

Something like

local file = fs.open(path, "r")
local lines = {}
for line in file.readLine do
  table.insert(lines, line)
end

Will result in the table lines containing each line of your file, lines[1] will be the first line, lines[2] will be the second, etc…

And how can i compair with some name, like this??

if lines[1] == "Hayden Almeida" then

Hayden_Almeida, on 27 April 2016 - 06:10 PM said:

And how can i compair with some name, like this??

if lines[1] == "Hayden Almeida" then

Exactly.

Anavrins, on 27 April 2016 - 06:13 PM said:

Hayden_Almeida, on 27 April 2016 - 06:10 PM said:

And how can i compair with some name, like this??

if lines[1] == "Hayden Almeida" then

Exactly.

ERROR in this line:

for line in hFile.readLine() do

attempt to call string


MY CODE:

hFile = fs.open("configs/gerentes", "r")
   local lines = {}
for line in hFile.readLine() do
    table.insert(lines, line)
   end
   hFile.close()

You put brackets after readLine, they shouldn't be there…

More on the generic for loop here.

Maybe gmatch('\n')
This will tell you to make a table containing each line of the file, but excludes \\n

Then you just type line = lines[80000000]

Anavrins, on 27 April 2016 - 06:19 PM said:

You put brackets after readLine, they shouldn't be there…

for line in hFile.readLine() do

Where are brackets here?

everyOS, on 27 April 2016 - 07:09 PM said:

Maybe gmatch('\n')
This will tell you to make a table containing each line of the file, but excludes \\n

Then you just type line = lines[80000000]

More like :

local lines = {}
local file = fs.open(path, "r")
local data = file.readAll()
file.close()
for token in gmatch("[^\n]+") do
  lines[#lines+1] = token
end

Creator, on 27 April 2016 - 07:33 PM said:

More like :

lines[#lines+1] = token

Try table.insert

everyOS, on 27 April 2016 - 07:39 PM said:

Creator, on 27 April 2016 - 07:33 PM said:

More like :

lines[#lines+1] = token

Try table.insert

More like you did not get the point of my correction.

By the way, table.insert is just a wrap around this:

lines[#lines+1] = token

Hayden_Almeida, on 27 April 2016 - 07:11 PM said:

for line in hFile.readLine() do

Where are brackets here?

Just look at my code again, readLine shouldn't have () after it, that's why your code errors.

SOLVED!

This works:

local lines = {}
   local hFile = fs.open("configs/gerentes", "r")
   for lines in hFile.readLine do
    if lines == ler then passou = true end
    print(linha)
    sleep(0.5)
   end
   hFile.close()

Threads merged… You don't need two for the one question.