"CreditCard" need help

hello guys somebody has an idea how i can make a counter where you put in the creditcard (FloppyDisk) in and it shows you how much money is on it? and you can enter a command and add money from counter to card or add money from card to counter? thx for helping :-) sry if my english is wrong :)/>/> im from germany

Should this be in Ask A Pro? Oh, well.
Yes and no.
Yes, it's possible, but no, you can't do it. Why? Because I'm doing it first. :)/>/>

tiin57, on 01 September 2012 - 07:25 PM said:

but no, you can't do it.

Anyone can do it. Especially if they make it faster than you.

Sorry, didn't quite realize that that would be taken seriously. My above post was a joke.

I would suggest having a secure server to store the credit information rather than my initial idea of hosting the amount directly on the card. The accounts should also have a PIN to prevent theft and fraud, as anyone who has the most basic knowledge of LUA would be able to do (changing the card registered name/number to match other accounts).

I could help more, but I am afraid I know very little about programming in this language. If I can be directed to a list of commands, I can help set it up.

Already did It :D/>/>

But then my friend destroyed the server…

then this guy is unucky ^^^^^^
xD

This is Team Econ's project :)/>/>

Indeed.

local function getMoney()
local creditCard = fs.open("disk/creditCard", "r")
local money = creditCard.readAll()
creditCard.close()
return money
end
local function addMoney(toAdd)
local creditCard = fs.open("disk/creditCard", "w")
local newMoney = getMoney() + toAdd
if newMoney < 0 then
  creditCard.close()
  return false
else
  creditCard.write(newMoney)
  creditCard.close()
  return true
end
end

Copy and paste this into any program you want to use a credit card inside of. Congrats, you now have the base of a working credit card system. Do note that this offers no protection whatsoever from people stealing your (fake) money.

getMoney returns the amount of money on the first credit card inserted into the drive.
addMoney returns true/false depending on if the transfer went through.

For example, if I wanted to make a shop:

if getMoney() < 50 then
print("You don't have enough money!")
else
addMoney(-50) --negative values take money away
redstone.setOutput("right", true) -- this can be changed
os.sleep(1)
redstone.setOutput("right", false)
end
disk.eject(side) -- change side to the side that your drive is on
-- this gives them their credit card back.

KillaVanilla, on 17 September 2012 - 12:56 AM said:

local function getMoney()
local creditCard = fs.open("disk/creditCard", "r")
local money = creditCard.readAll()
creditCard.close()
return money
end
local function addMoney(toAdd)
local creditCard = fs.open("disk/creditCard", "w")
local newMoney = getMoney() + toAdd
if newMoney < 0 then
  creditCard.close()
  return false
else
  creditCard.write(newMoney)
  creditCard.close()
  return true
end
end

Copy and paste this into any program you want to use a credit card inside of. Congrats, you now have the base of a working credit card system. Do note that this offers no protection whatsoever from people stealing your (fake) money.

getMoney returns the amount of money on the first credit card inserted into the drive.
addMoney returns true/false depending on if the transfer went through.

For example, if I wanted to make a shop:

if getMoney() < 50 then
print("You don't have enough money!")
else
addMoney(-50) --negative values take money away
redstone.setOutput("right", true) -- this can be changed
os.sleep(1)
redstone.setOutput("right", false)
end
disk.eject(side) -- change side to the side that your drive is on
-- this gives them their credit card back.

This is an excellent example of a bad economy system.
Anyone can do "edit disk/creditCard" and become a billionaire.

Leonardoas26, on 17 September 2012 - 02:50 AM said:

KillaVanilla, on 17 September 2012 - 12:56 AM said:

–code snip–

This is an excellent example of a bad economy system.
Anyone can do "edit disk/creditCard" and become a billionaire.

Which is why I said that it was the BASIS of an economy system. This was a quick job, to demonstrate how to do something. I see your point, though.

To OP:
Perhaps, instead of having the amount of credits be stored on the credit card, have each register send a rednet/http request to a server that authorizes the transaction and modifies the amount stored. The credit card could only have it's ID attached, and something identifying it as a credit card.

Sounds like an awesome idea, however I would like it to be amateurish so I could hack myself moneys…lol >8)

yes the code is a bad economy :)/>/>.
i made an internet which everybody can use, cause its on a server.
i thinked about it to make an "CreditCard-InGame-Server". My only problem is, that if i would set the worth of a creditcard
to zero, and somebody earns money and i reboot the server or ingame-server the money will be gone. so i ask you
my idea is SOMETHING LIKE this so pls no posts like "this would not work…"

CreditCard1234 = 0
id, name = rednet.receive()
if name == "CreditCard1234" then
id, password = rednet.receive()
if password == "1234" then
CreditCard1234 = CreditCard1234+10
print(CreditCard1234)
10
else
end
end

os.reboot() or something else… so i want to make online banking that works like this:
everybody have a card.
somebody puts in a card in the counter.
the program on the card is called "startup".
the program sends(CreditCard1234) to the server located somewhere else.
the server waits for password and (i dont write it down but you can select want you want to + or -) + money or - money.
so this is my basic idea.
but i dont know how to do this:
the worth must be the same after rebooting ingame- or minecraftserver.

thx for replies :D/>/>
bb lixowurm

lixowurm. could i see the internet? :)/>/>


tell me the ip.


tekkit or 1.4.1 on minecraft?

yes IceCream, join hamachi network : 082-242-487
i have CC1.41 no tekkit
bb :)/>/>

CapturetheBomb, on 01 September 2012 - 09:51 PM said:

I would suggest having a secure server to store the credit information rather than my initial idea of hosting the amount directly on the card. The accounts should also have a PIN to prevent theft and fraud, as anyone who has the most basic knowledge of LUA would be able to do (changing the card registered name/number to match other accounts).

I could help more, but I am afraid I know very little about programming in this language. If I can be directed to a list of commands, I can help set it up.

yes thats how i want to make it. there is a wiki http://computercraft...aft_Wiki_-_Home here are informations about API
commands… it helped me a lot

I think for the post about how you were to do it, you should instead of it being variable to save the account info set it up to open a desperate file and to read it to a variable…kinda like this

Handle = fs.open(username, "r")
Bal = to number(handle.read all())

That

Topic's a little old, bro.

Indeed. The amount of black magic here is a little dangerous. Locked to prevent further necromancy.