how to interact with smart contract about dart_tron HOT 2 CLOSED

//class from web3dart you need contract abi and address
final DeployedContract _contract =
        DeployedContract(abi, contractAddress); 
    // contractAddress is EthereumAddress, You have to rewrite EthereumAddress  class to support Tron network address as well

  // Only this part changes to call other methods
    final _encodeParameters = _contract
        .function('transfer')
        .encodeCall([receiver!, _currentTransactionValue]);


    final block =
        await _getNowBlock(); // get now block from Tron protocol wallet/getnowblock

    // class from Tron package
    tron.TriggerSmartContract _value = tron.TriggerSmartContract(
        data: _encodeParameters,
        ownerAddress: hexToBytes(account.account.ethereumAddress.hex),
        contractAddress: hexToBytes(token!.ethAddress.hex));

     // class from Tron package
    any.Any parameter = any.Any(
        typeUrl: "type.googleapis.com/protocol.TriggerSmartContract",
        value: _value.writeToBuffer());

   // class from Tron package
    tron.Transaction_Contract _transactionContract = tron.Transaction_Contract(
      parameter: parameter,
      type: tron.Transaction_Contract_ContractType.TriggerSmartContract,
    );

    // class from Tron package
    tron.Transaction_raw rawData = tron.Transaction_raw(
        contract: [_transactionContract],
        expiration: fixnum.Int64(DateTime.now()
            .toUtc()
            .add(const Duration(hours: 1))
            .millisecondsSinceEpoch),
        timestamp: fixnum.Int64(
            (DateTime.now().toUtc().millisecondsSinceEpoch / 1000).round()),
        refBlockBytes: hexToBytes(block["raw_data"]["ref_block_bytes"]),
        refBlockHash: hexToBytes(block["raw_data"]["ref_block_hash"]),
        feeLimit: fixnum.Int64(10000000));

    // class from web3dart package
    Credentials credentials = account.account.accountCredentials;
    final trSignature = await credentials.signTron(rawData
        .writeToBuffer()); // I override  Credentials class on web3dart to sign tron

// class from tron package
    tron.Transaction _tr = tron.Transaction(
        rawData: rawData,
        signature: [hexToBytes(trSignature)]);

    final String signedTransacation = bytesToHex(_tr.writeToBuffer());
    final _send = {
      "transaction": signedTransacation,
    };

    final txId = await httpClient.normalPost(
        tronApi.buildApi("wallet/broadcasthex"),
        data: _send); // send transaction to network
    print("transaction id: ${txId["txId"]}");

  call() async{
    final DeployedContract _contract =
        DeployedContract(abi, contractAddress);
    final _encodeParameters =
        _contract.function('balanceOf').encodeCallWitoutSelector([address]);
    final Map<String, dynamic> _data = {
      "owner_address": "410000000000000000000000000000000000000000",
      "contract_address": "41a614f803b6fd780986a42c78ec9c7f77e6ded13c",
      "function_selector": "balanceOf(address)",
      "parameter": bytesToHex(_encodeParameters)
    };
    final data = await httpClient.normalPost(tronApi.buildApi("wallet/triggerconstantcontract"),data: _data);
  }