Web3j, how to correctly byte encode multiple data?
Web3j, how to correctly byte encode multiple data?
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Hackuz · External communityPost link
External question — Ethereum Stack Exchange
Author: Hackuz
Original post: https://ethereum.stackexchange.com/questions/113014
License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/
Adaptation: HTML converted to plain text; contact email addresses removed.
I am interacting with a smart contract and i do not understand correctly how to encode the data using Web3j to interact with the smart contract since I had never interacted with a contract that required multiple byte-encoded data.
//this is a small example of what i have
//Solidity example contract
pragma solidity 0.8.7;
contract example {
function exampleFunction(bytes memory params){
//Decode Data.
(address[] memory array0, uint numberExample, address[] memory array1) = abi.decode(params, (address[], uint, address[]));
//do more...
}
}
//Web3j
//prepare example data
List<String> array0 = new ArrayList<String>();
array0.add("0x......");
array0.add("0x......");
BigInteger numberExample = new BigInteger("4234242342424");
List<String> array1 = new ArrayList<String>();
array1.add("0x......");
array1.add("0x......");
//this is my problem as it is my first time sending encoded data.
byte[] params = ????;
//how to correctly encode the data?
//load contract
MixExecutor Contract = example.load(exampleContractAddress, web3j, transactionManager, gasPrice, gasLimit);
//Execute function
TransactionReceipt Tx = Contract.exampleFunction(params).sendAsync().get();
String hash = Tx.getTransactionHash();
//Contract Wrap
public RemoteCall<TransactionReceipt> exampleFunction(byte[] params) {
final Function function = new Function(
FUNC_EXAMPLEFUNCTION,
Arrays.<Type>asList(new org.web3j.abi.datatypes.DynamicBytes(params),
Collections.<TypeReference<?>>emptyList());
return executeRemoteCallTransaction(function);
}
//I tried this but when executing the smart contract it gave an error.
String data = Arrays.<Type>asList(
//array0
new org.web3j.abi.datatypes.DynamicArray<org.web3j.abi.datatypes.Address>(
org.web3j.abi.datatypes.Address.class,
org.web3j.abi.Utils.typeMap(
array0, org.web3j.abi.datatypes.Address.class
)
),
///numberExample
new org.web3j.abi.datatypes.generated.Uint256(numberExample),
//array1
new org.web3j.abi.datatypes.DynamicArray<org.web3j.abi.datatypes.Address>(
org.web3j.abi.datatypes.Address.class,
org.web3j.abi.Utils.typeMap(
array1, org.web3j.abi.datatypes.Address.class
)
)
).toString();
byte[] params = data.getBytes();
I think this might help me, I'll keep looking.
I wonder if I will have to change the smart contract so that instead of receiving a data bytes it receives a Struct.
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phaze · External communityPost link
External answer — Ethereum Stack Exchange
Author: phaze
Original post: https://ethereum.stackexchange.com/a/113033
License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/
Adaptation: HTML converted to plain text; contact email addresses removed.
web3.eth.abi.encodeParameters(
['address[]', 'uint256', 'address[]'],
[
['0x000000000000000000000000000000000000dEaD', '0x000000000000000000000000000000000000dEaD'],
'14',
['0x000000000000000000000000000000000000dEaD'],
]
);
You can read more about it in the docs:
https://web3js.readthedocs.io/en/v1.2.11/web3-eth-abi.html
There's also
encodeFunctionCall
to encode a full function with parameters.
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Quoted from Forex.com.bd-Editorial External answer — Ethereum Stack Exchange Author: phaze Source score (net votes, not local likes): 0 Original post: https://ethereum.stackexchange.com/a/113033 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. web3.eth.abi.encodeParameters( ['address[]', 'uint256', 'address[]'], [ ['0x000000000000000000000000000000000000dEaD', '0x000000000000000000000000000000000000dEaD'], '14', ['0x000000000000000000000000000000000000dEaD'], ] ); You can read more about it in the docs: https://web3js.readthedocs.io/en/v1.2.11/web3-eth-abi.html There's also encodeFunctionCall to encode a full function with parameters.
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