How to use Web3.Utils.formatToEthereumUnits() to parse a BigUint?

[AlleniCode]

If I get a token's decimal, and a BigUInt balance, how to format it to a string? THX!

[dangell7]

        var options = TransactionOptions.defaultOptions
        options.gasPrice = .automatic
        options.gasLimit = .automatic
        options.nonce = .latest
        options.from = signor
        let parameters: [EthereumAddress] = [signor]
        let tokenBalanceTx = contract.read(
            "balanceOf",
            parameters: parameters as [AnyObject],
            extraData: Data(),
            transactionOptions: options
        )
        let result = try? tokenBalanceTx?.call()
        guard let tokenWei = result?["0"] as? BigUInt else {
            print("FAILED ON PARSE RESULT")
            self.getBalanceDelegate?.getEthBalanceFailure(error: ErrorCodes().getError("CRYP1")) //BADC1
            return
        }
        guard let tokenBalance = Web3.Utils.formatToEthereumUnits(tokenWei) else {
            print("FAILED ON FORMAT TOKEN BALANCE")
            self.getBalanceDelegate?.getEthBalanceFailure(error: ErrorCodes().getError("CRYP1")) //BADC1
            return
        }
        guard let tokenIntBalance = Double(tokenBalance)?.rounded(toPlaces: 0) else {
            self.getBalanceDelegate?.getEthBalanceFailure(error: ErrorCodes().getError("CRYP1")) //BADC1
            return
        }

[AlleniCode]

My test code:

// USDT       0xdac17f958d2ee523a2206206994597c13d831ec7
// decimals   6
// 0.3 USDT

let decimals = 6
let balanceWithDecimals = "300000"
let balanceWithSymbol = "0.3"

let big = BigUInt.init(balanceWithDecimals, Web3.Utils.Units.wei)!
let result = Web3.Utils.formatToPrecision(big, numberDecimals: decimals, formattingDecimals: 8, decimalSeparator: ".", fallbackToScientific: false)
print(result)  // Optional("0.300000")
if Float(balanceWithSymbol) == Float(result as! String) {
     print("right")
} else {
     print("wrong")
}

@dangell7 Is this right?

[dangell7]

Is this after calling getBalance?

Or are you creating variables for interaction with a smart contract?

[AlleniCode]

@dangell7 Yes. The 'big' constant with type 'BigUInt' is the balance I got from a samrt contract.
Some code here:

...
let tx = contract.read()
let txResult = try? tx.call() as [String: Any]
let balance = txResult?["somekey"]
let balanceString = Web3.Utils.formatToPrecision(balance as! BigUInt, numberDecimals: tokenDecimals, formattingDecimals: 8, decimalSeparator: ".", fallbackToScientific: false)!

[RaviRanjan-11]

You can use your own unit using web3Units

create Your Unit
let myUnit = Web3Units(rawValue: your deciamal Unit)

Fetch balance with web3 instance and your address
let balance = try? wInstance.eth.getBalance(address: yourEthAddress)

convert balance in to string
let balanceString = Web3.Utils.formatToEthereumUnits(balance ?? "0", toUnits: myUnit, decimals: 4)

[Iysbaera]

@AlleniCode Hey, do you still have this issue?