How to get balances with wallet address and list token addresses?-CodePudding

Hi I'm new to blockchain, truffle and Solidity and I've been stuck on this problem for quite long. I want to get all token balances given a wallet address and the token contract addresses using a contract, but I keep encountering

Error: Returned error: VM Exception while processing transaction: revert

whenever I test my contract.

Here's the code of my contract in Solidity:

pragma solidity ^0.8.17;

import {IERC20} from './IERC20.sol';

contract UtilityContract {
    function getBalances(address walletAddress, address[] memory tokenAddresses) public view returns (address[] memory, uint[] memory) {
        uint len = tokenAddresses.length;
        uint[] memory balances = new uint256[](len);
        for (uint i=0; i<len; i  ) {
            balances[i] = IERC20(tokenAddresses[i]).balanceOf(walletAddress);
        }
        return (tokenAddresses, balances);
    }
}

and here's my test code:

const ADDRESS = "0xF977814e90dA44bFA03b6295A0616a897441aceC"; // some wallet address with token balance
const TOKENS = [    // token contract addresses
    "0x111111111117dC0aa78b770fA6A738034120C302",
    "0xC943c5320B9c18C153d1e2d12cC3074bebfb31A2",
];

const UtilityContract = artifacts.require('UtilityContract.sol');
contract('UtilityContract', ()=> {
    it('getBalances', async ()=> {
        const utilityContract = await UtilityContract.new();
        const output = await utilityContract.getBalances(ADDRESS, TOKENS);
        console.log(output);
    });
});

Here's a screenshot of the error: revert error

I imported the IERC20 interface to use the balanceOf function but for some reason it does not work.

CodePudding user response：

Please try this line into your code.. address() convert your wallet string to a valid wallet address format.

IERC20(tokenAddresses[i]).balanceOf(address(walletAddress));

CodePudding user response：

The error is coming from the following line

IERC20(tokenAddresses[i]).balanceOf(walletAddress);

It is most probably related with your input parameters. make sure that token address is actually valid ERC20 token.

so instead of passing token addresses directly, It is safer to create/deploy IERC20 token and pass address of the deployed token into getBalances function for testing.