FileSystem problem

[TheJebForge 0]

I want to make my bank system for my server, but I got problem when making bank network.

 

When server tries write a file, it got an error like fil = nil. I can't solve the problem, so please help me!

There's the code:

local com = require("component")
local ev = require("event")
local fs = require("filesystem")
local net = com.modem
net.open(15)
print("Opened Net. Waiting for commands")
while true do
  local _,_,from,port,_,message,nick,balance = ev.pull("modem_message")
  if message == "getInfo" then
    if fs.exists("bankAccounts/"..nick) then
      local fil = io.open("bankAccounts/"..nick,"r")
      bal = fil:read(1000)
      fil:close()
      net.send(from,15,nick,bal)
    else
      net.send(from,15,"no info")
    end
  end
  if message == "setInfo" then
    local fil = io.open("bankAccounts/"..nick,"wb")
    fil:write(balance)
    fil:close()
    net.send(from,15,"done it")
  end
end

[Gangsir 14]

It'd be useful to include the line the error message warns about. I can't find anything immediately wrong with the code.

[meigrafd 0]

What is if you change 'binary' write-mode to normal? -> "w" instead of "wb"

And does the directory 'bankAccounts/' exists?

Add something like

if not fs.isDir("bankAccounts") then
    fs.makeDir("bankAccounts")
end

before your loop..

And btw: instead of using ev.pull("modem_message") inside of a loop you should use event.listen("modem_message", <yourfunction>) but after that you still need something so script doesnt quit -> a loop

E.g.:

if not fs.isDir("bankAccounts") then
  fs.makeDir("bankAccounts")
end

function messageReceived(event, localAddress, remoteAddress, port, senderDistance, message, nick, balance)
  nick = nick or nil
  balance = balance or nil
  if message == "getInfo" then
    ...
  elseif message == "setInfo" then
    local fil = io.open("bankAccounts/"..nick, "w")
    fil:write(balance)
    fil:close()
    net.send(remoteAddress, 15, "done it")
  end
end
event.listen("modem_message", messageReceived)

while true do
  os.sleep(1)
end

[TheJebForge 0]

bankAccounts folder exists. Just it can't make a filestream. Error is: error to get global fil (got a nil).

When I try to switch from wb to w. Nothing happens. Same error.

With events anything is okay. Error appears when computer got a message and tries to make changes to file system.

[Gangsir 14]

Try attempting to find out where exactly fil is nil. Add the below to places where fil is used.

if fil == nil then
 print("Something's not right.")
end

Add the line number the if is at to the message printed, then run the program.

[TheJebForge 0]

Tried. It can't create filestream

[Negi 6]

Have you tried with an already-existing file ? And are you sure that your program is at the right work directory ? Programs start at the work directory of the shell, which by default is the root.