Approve with WalletConnect session?

[LongTien15]

I'm connecting to metamask app via wallet_connect_dart and want to swap DAI to ETH, so i want metamask to approve the smart contract to have some DAI but i dont know how ?

[xclud]

Hi,
You need to create an ERC20 object with DAI smart contract as the address.

final dai = ERC20(
    address: EthereumAddress.fromHex(
        '0x6b175474e89094c44da98b954eedeac495271d0f'),
    client: client,
);

Then call dai.balanceOf.

Please look at the example usage in the README.md file.

Does this solve your problem?

[LongTien15]

The client is from infuria node right? but i'm connecting to Metamask mobile app with this package https://pub.dev/packages/walletconnect_dart. So how can i use your package with metamask connection? I'm trying to swap erc20 tokens with Uniswap smart contract

[LongTien15]

`
Future transferTokensToSmartContract(List args) async {
DeployedContract contract =
await getContract(erc20ContractAddress, erc20ContractAbi);
print(contract.address);
ContractFunction transferFunc = contract.function('transferFrom');
// ContractFunction symbol = contract.function('symbol');
return transferFunc.encodeCall(args);
}

var xx = await uniSc.transferTokensToSmartContract([
EthereumAddress.fromHex(session.accounts.first),
EthereumAddress.fromHex('0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D'),
BigInt.from(0.00001 * pow(10, 18)),
]);

    var a = await EthereumWalletConnectProvider(connector).sendTransaction(
        from: session.accounts[0],
        to: '0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D',
        data: xx,
        value: BigInt.from(0.00001 * pow(10, 18)),
        gas: 1000000,
        gasPrice: BigInt.from(900000));

`
This is what is do

[xclud]

If you want to check if the wallet has some DIAs, it doesn't matter where you are querying the account balance. Infura in the example can be replaced with anything.

[LongTien15]

i want to swap dai for eth through uniswap v2 smart contract. and i can't access the amount of dai in my metamask wallet