transferFrom method

Future<String> transferFrom(String contractAddres_, dynamic _spenderAddr, dynamic receiver_Address, dynamic transferfrom_value, dynamic SpenderPrivatekey, dynamic ownerAddress,)

Transfer tokens from one address to another contractAddres_ : Token Address. _spenderAddr : Spender Address is The address which you want to send tokens from. reciever_Address : Reciever Address is The address which you want to transfer to. spenderPrivateKey: Spender's Private key. ownerAddress : Token Owner Address. transferfrom_value : the amount of tokens to be transferred.

Implementation

Future<String> transferFrom(
    String contractAddres_,
    _spenderAddr,
    receiver_Address,
    transferfrom_value,
    SpenderPrivatekey,
    ownerAddress) async {
  final EthereumAddress contractAddr =
      EthereumAddress.fromHex(contractAddres_);

  final contract = DeployedContract(
      ContractAbi.fromJson(abiString, 'XRC20'), contractAddr);
  final tokenTransferFrom = contract.function('transferFrom');
  final EthereumAddress spender = EthereumAddress.fromHex(_spenderAddr);
  final EthereumAddress receiver = EthereumAddress.fromHex(receiver_Address);
  final EthereumAddress ownAddr = EthereumAddress.fromHex(ownerAddress);
  final BigInt parsed__value = BigInt.parse('1000000000000000000');

  final nonce = await client.getTransactionCount(spender);
  final gasPrice = await client.getGasPrice();
  final transferFrom = await Transaction.callContract(
    contract: contract,
    function: tokenTransferFrom,
    parameters: [
      ownAddr,
      receiver,
      BigInt.from(transferfrom_value) * parsed__value
    ],
    from: spender,
    gasPrice: gasPrice,
    nonce: nonce,
    maxFeePerGas: null,
    maxPriorityFeePerGas: null,
  );
  final String spender_privateKey = SpenderPrivatekey;

  final credentials = await EthPrivateKey.fromHex(spender_privateKey);

  final transferForms = await client.sendTransaction(
      credentials, transferFrom,
      chainId: null, fetchChainIdFromNetworkId: true);
  return ('$transferForms');
}