approve method
Future<String>
approve(
- String owner_PrivateKey,
- dynamic contractadd,
- dynamic spenderadd,
- dynamic approve_value,
Approve the passed address to spend the specified amount of tokens on behalf of owner. owner_PrivateKey : Owner Private key. contractAdd : Token Address. spenderadd : The address which will spend the funds. approve_value : The amount of tokens to be spent.
Implementation
Future<String> approve(
String owner_PrivateKey, contractadd, spenderadd, approve_value) async {
final String privateKey = owner_PrivateKey;
final credentials = await EthPrivateKey.fromHex(privateKey);
final EthereumAddress contractAddr = EthereumAddress.fromHex(contractadd);
final contract = DeployedContract(
ContractAbi.fromJson(abiString, 'XRC20'), contractAddr);
final tokenApprove = contract.function('approve');
final EthereumAddress spender = EthereumAddress.fromHex(spenderadd);
final approve = await Transaction.callContract(
contract: contract,
function: tokenApprove,
parameters: [spender, BigInt.from(approve_value)]);
final approvel = await client.sendTransaction(credentials, approve,
chainId: null, fetchChainIdFromNetworkId: true);
return ('$approvel');
}