[HELP] Currency window/system

[..:D&G:..]

Hey guys, I am trying to make a window that is showing the real life currency exchange rates. Something like "£1 -> $1.56" the thing is I don't know how to get the real life currency and how to make it that simple, because google's currency thing gives me a longer number...

[t3wz]

You can use a site that provides the currency exchange in an api, something like this or this.

[..:D&G:..]

You can use a site that provides the currency exchange in an api, something like this or this.

Those are API's and I have to make a website for that, which I don't really want to atm, I want something simple

I found this https://www.google.com/finance/converter , But I don't know how to call it so I can select the currencies and amount in-game, and also display only the result of the conversion..

[t3wz]

[quote name=..&G:..]Those are API's and I have to make a website for that, which I don't really want to atm, I want something simple

I found this https://www.google.com/finance/converter , But I don't know how to call it so I can select the currencies and amount in-game, and also display only the result of the conversion..

you don't need to create a website...

fetchRemote ( "http://api.fixer.io/latest", 
    function ( response, error ) 
        if error == 0 then 
            response = fromJSON ( response ) -- the response is encoded in json, then we need to use fromJSON 
            print ( "1 EUR == "..response["rates"]["BRL"].." BRL" ) 
        else 
            print ( "error "..error.." when getting the currency." ) 
        end 
    end 
) 

[..:D&G:..]

[quote name=..&G:..]Those are API's and I have to make a website for that, which I don't really want to atm, I want something simple

I found this https://www.google.com/finance/converter , But I don't know how to call it so I can select the currencies and amount in-game, and also display only the result of the conversion..

you don't need to create a website...

fetchRemote ( "http://api.fixer.io/latest", 
    function ( response, error ) 
        if error == 0 then 
            response = fromJSON ( response ) -- the response is encoded in json, then we need to use fromJSON 
            print ( "1 EUR == "..response["rates"]["BRL"].." BRL" ) 
        else 
            print ( "error "..error.." when getting the currency." ) 
        end 
    end 
) 

And how do I use that? I never used a fetchRemote function before...

Like, how do I make a command like "/checkexchange 1 eur" ?

[t3wz]

[quote name=..&G:..]And how do I use that? I never used a fetchRemote function before...

Like, how do I make a command like "/checkexchange 1 eur" ?

fetchRemote gets the 'text' of a site (in this case http://api.fixer.io/latest) and send it as parameter of the function defined in the second parameter.

the response is something like that:

{ 
    "base": "EUR", 
    "date": "2015-08-14", 
    "rates": { 
        "AUD": 1.5122, 
        "BGN": 1.9558, 
        "BRL": 3.91, 
        "CAD": 1.4571, 
        "CHF": 1.0875, 
        "CNY": 7.1396, 
        "CZK": 27.028, 
        "DKK": 7.4633, 
        "GBP": 0.7145, 
        "HKD": 8.664, 
        "HRK": 7.5435, 
        "HUF": 310.69, 
        "IDR": 15387.8, 
        "ILS": 4.2187, 
        "INR": 72.62, 
        "JPY": 138.7, 
        "KRW": 1314.78, 
        "MXN": 18.326, 
        "MYR": 4.5583, 
        "NOK": 9.1375, 
        "NZD": 1.7033, 
        "PHP": 51.557, 
        "PLN": 4.1862, 
        "RON": 4.4257, 
        "RUB": 72.452, 
        "SEK": 9.4308, 
        "SGD": 1.5667, 
        "THB": 39.322, 
        "TRY": 3.1652, 
        "USD": 1.1171, 
        "ZAR": 14.293 
    } 
} 

... in JSON format, then we use fromJSON and convert it to Lua tables.

table = { 
    ["base"] = "EUR", 
    ["date"] = "2015-08-14", 
    ["rates"] = { 
        ["AUD"] = = 1.5122, 
        ["BGN"] = = 1.9558 
        ["BRL"] = 3.91, 
        ["CAD"] = 1.4571, 
        ["CHF"] = 1.0875, 
        ["CNY"] = 7.1396, 
        ["CZK"] = 27.028, 
        ["DKK"] = 7.4633, 
        ["GBP"] = 0.7145, 
        ["HKD"] = 8.664, 
        ["HRK"] = 7.5435, 
        ["HUF"] = 310.69, 
        ["IDR"] = 15387.8, 
        ["ILS"] = 4.2187, 
        ["INR"] = 72.62, 
        ["JPY"] = 138.7, 
        ["KRW"] = 1314.78, 
        ["MXN"] = 18.326, 
        ["MYR"] = 4.5583, 
        ["NOK"] = 9.1375, 
        ["NZD"] = 1.7033, 
        ["PHP"] = 51.557, 
        ["PLN"] = 4.1862, 
        ["RON"] = 4.4257, 
        ["RUB"] = 72.452, 
        ["SEK"] = 9.4308, 
        ["SGD"] = 1.5667, 
        ["THB"] = 39.322, 
        ["TRY"] = 3.1652, 
        ["USD"] = 1.1171, 
        ["ZAR"] = 14.293 
    } 
} 

with the table we can convert 1 EUR to 1 USD for example with table["rates"]["USD"] and make a command like this:

currencies = {} -- table that will store all the currencies. 
  
function updateCurrencies ( ) -- function that will get the currencies from the site and update him at the table 
    fetchRemote ( "http://api.fixer.io/latest", 
        function ( response, error ) 
            if error == 0 then 
                local decode = fromJSON ( response ) 
                currencies = decode["rates"] --set the currencies table equal to the response of the fetchRemote function 
            else 
                print ( "error "..error.." when getting the currency." ) 
            end 
        end 
    ) 
    return true 
end 
  
updateCurrencies() -- call the function for the first time 
  
setTimer ( updateCurrencies, 1 * 3600000, 0 ) -- update the values (call the function again) every one hour. 
  
function convertCommand ( thePlayer, cmd, currency, number ) -- command: /convert [currency] [number] (ex: /convert USD 2 will convert 2 EURs to 2 USDs) 
    if currency and number and tonumber(number) and tonumber(number) > 0 then 
        if currencies[currency] then -- if is a valid currency 
            local number = tonumber ( number ) 
            local result = currencies[currency] * number 
            outputChatBox ( number.." EUR == "..result.." "..currency, thePlayer, 0, 255, 0 ) 
        else 
            outputChatBox ( "Invalid currency", thePlayer, 255, 0, 0 ) 
        end 
    else 
        outputChatBox ( "Syntax: /convert [currency] [number]", thePlayer, 255, 0, 0 ) 
    end 
end 
addCommandHandler ( "convert", convertCommand ) 

hope u understand.

obs: the values (in the site) are updated daily (so there's no need to use fetchRemote every hour, that's just an example..)

Edited August 16, 2015 by Guest

[..:D&G:..]

The "updateCurrencies" function I didn't understand, but how do I convert USDs to Pounds for example? That function converts Euros to other thing. I see that the default currency is Euro, but how do I convert something different than Euros?

[t3wz]

as written in the page:

Rates are quoted against the Euro by default. Quote against a different currency by setting the base parameter in your request.

[url=http://api.fixer.io/latest?base=USD]http://api.fixer.io/latest?base=USD[/url] 

and what you don't understood in updateCurrencies function?

[..:D&G:..]

You added the function in the fetchRemote and I don't get how that works...

Also, I did this to change the currency but it doesn't seem to work, it gives me invalid currency after I try to convert something

---EDIT

It shows me that the currency is invalid only when I try to convert the same currency... But it work. Any idea how to get the currency that I've set so I can change where it says "EUR =="?

function updateCurrencies ( currency )  
    fetchRemote ( "http://api.fixer.io/latest?base="..currency, 
        function ( response, error ) 
            if error == 0 then 
                local decode = fromJSON ( response ) 
                currencies = decode["rates"]  
            else 
                print ( "error "..error.." when getting the currency." ) 
            end 
        end 
    ) 
    return true 
end 
  
--updateCurrencies()  
  
setTimer ( updateCurrencies, 1 * 3600000, 0 )  
  
function updateCurrencyLink(thePlayer, cmd, currency) 
    updateCurrencies(currency) 
    outputChatBox(currency, thePlayer) 
end 
addCommandHandler("setcurrency", updateCurrencyLink) 

[t3wz]

[...] It shows me that the currency is invalid only when I try to convert the same currency... But it work. Any idea how to get the currency that I've set so I can change where it says "EUR =="?

updateCurrencies function only gets the currencies from the site, it does not return anything useful.

you've to do something like this:

currencies = {} 
  
function updateCurrencies ( ) 
    fetchRemote ( "http://api.fixer.io/latest?base=USD", -- se, i'veh changed the url... 
        function ( response, error ) 
            if error == 0 then 
                local decode = fromJSON ( response ) 
                currencies = decode["rates"] 
            else 
                print ( "error "..error.." when getting the currency." ) 
            end 
        end 
    ) 
    return true 
end 
  
updateCurrencies() 
  
setTimer ( updateCurrencies, 1 * 3600000, 0 ) 
  
function convertCommand ( thePlayer, cmd, currency, number ) 
    if currency and number and tonumber(number) and tonumber(number) > 0 then 
        if currencies[currency] then 
            local number = tonumber ( number ) 
            local result = currencies[currency] * number 
            outputChatBox ( number.." USD == "..result.." "..currency, thePlayer, 0, 255, 0 ) -- changing EUR to USD doesn't change anything on the script, it's just a string... 
        else 
            outputChatBox ( "Invalid currency", thePlayer, 255, 0, 0 ) 
        end 
    else 
        outputChatBox ( "Syntax: /convert [currency] [number]", thePlayer, 255, 0, 0 ) 
    end 
end 
addCommandHandler ( "convert", convertCommand ) 

about fetchRemote, if you go to the wiki you'll see the parameters of this function, the second parameter (ignoring the optional) has to be an function (which will receive the 'results' of the fetch)

sorry if my explications is confusing you, my english does not help

[..:D&G:..]

The thing is that I want to set the default currency from a window, so I want to make a command to set it.

[t3wz]

[quote name=..&G:..]The thing is that I want to set the default currency from a window, so I want to make a command to set it.

Something like that?

Server:

local validCurrencies = {  
    ["AUD"] = true, 
    ["BGN"] = true, 
    ["BRL"] = true, 
    ["CAD"] = true, 
    ["CHF"] = true, 
    ["CNY"] = true, 
    ["CZK"] = true, 
    ["DKK"] = true, 
    ["GBP"] = true, 
    ["HKD"] = true, 
    ["HRK"] = true, 
    ["HUF"] = true, 
    ["IDR"] = true, 
    ["ILS"] = true, 
    ["INR"] = true, 
    ["JPY"] = true, 
    ["KRW"] = true, 
    ["MXN"] = true, 
    ["MYR"] = true, 
    ["NOK"] = true, 
    ["NZD"] = true, 
    ["PHP"] = true, 
    ["PLN"] = true, 
    ["RON"] = true, 
    ["RUB"] = true, 
    ["SEK"] = true, 
    ["SGD"] = true, 
    ["THB"] = true, 
    ["TRY"] = true, 
    ["USD"] = true, 
    ["ZAR"] = true, 
    ["EUR"] = true 
} 
  
  
function convert ( thePlayer, cmd, from, to, amount ) 
    if from and to and amount and tonumber(amount) and tonumber(amount) > 0 then 
        if validCurrencies[from] then 
            if validCurrencies[to] then 
                fetchRemote ( "http://api.fixer.io/latest?base="..from, 
                    function ( response, error ) 
                        if error == 0 then 
                            local results = fromJSON ( response ) 
                            triggerClientEvent ( thePlayer, "onResponse", thePlayer, from, to, tonumber ( amount ), results["rates"][to] ); 
                        else 
                            outputChatBox ( "Error "..error.." when getting the currency, contact an admin", thePlayer, 255, 0, 0 ) 
                        end 
                    end 
                ) 
            else 
                outputChatBox ( "Invalid currency (to)", thePlayer, 255, 0, 0 ) 
            end 
        else 
            outputChatBox ( "Invalid currency (from)", thePlayer, 255, 0, 0 ) 
        end 
    else 
        outputChatBox ( "Syntax: /convert [FROM] [TO] [AMOUNT]", thePlayer, 255, 0, 0 ) 
    end 
end 
addCommandHandler ( "convert", convert ) 

Client:

function onResponse ( from, to, amount, result ) 
    result = result * amount 
    outputChatBox ( "results sucesfully passed to the client. ("..result..")" ) 
    --[[ 
        here you use guiSetText or something like that. 
         
        parameters: 
         
        @ from      =   A currency (string), ex: EUR 
        @ to        =   A currency (string), ex: USD 
        @ amount    =   How much the player want to calculate (int), ex: 2 
        @ result    =   How much 'to' is 'from' (int), ex: $1.2 (without the $) 
    --]] 
end 
addEvent ( "onResponse", true ) 
addEventHandler ( "onResponse", root, onResponse ) 

of course you need to edit it (add the guis, remove the command if you want etc)

[..:D&G:..]

May I ask why you did "result = result * amount"? Just curious

[t3wz]

[quote name=..&G:..]May I ask why you did "result = result * amount"? Just curious

If the player wants to convert 20 EURs to x USDs for example,

result return how much is 1 USD, then we need to do that math to convert 1 USD to 20 USDs