[Ethereum] abi.decoder in solidity

abisolidityweb3js

Im trying to decode a bytes memory _data parameter directly in a smart contract.

Im currently running:

var data = await abi.encode("120000000000000000000", user2, OCcontract1.address, "120000000000000000000", OCcontract2);

So with its types

data abi.encode(BN, address, address,BN, address);

now within a function I want to use the solidity equivalent of abi.decode but running directly on the smart contract.

Any pointer will really help.

Best Answer

This did the trick for me:

functionName(data){
    uint _amount;
    address _receiver;
    address _tokenLeadContract;
    uint _expectedAmount;
    address _expectedSC;
    (_amount, _receiver, _tokenLeadContract, _expectedAmount, _expectedSC) = abi.decode(data, (uint, address, address, uint, address));
 }

Related Solutions

[Ethereum] TypeError: Data location must be “memory” for parameter in function, but none was given

From this:

pragma solidity^0.5.0;

contract Contract {
    string public name;

    function Contracts(string passedName) public {
        name = passedName;
    }

    function setName(string newName) public {
        name = newName;

    }

}

To This:

pragma solidity^0.5.0;

contract Contract {
    string public name;

    function Contracts(string memory passedName) public {
        name = passedName;
    }

    function setName(string memory newName) public {
        name = newName;

    }

}

Make sure to use "" to wrap text. Using '' will give you:

transact to Contract.Contracts errored: Error encoding arguments: SyntaxError: JSON.parse: unexpected character at line 1 column 2 of the JSON data

[Ethereum] Solidity: data type conversion from bytes to address/string/uint/int [ any library available? ]

https://solidity.readthedocs.io/en/v0.5.2/types.html?highlight=bytes#dynamically-sized-byte-array

Bytes is a not a value type according to the docs, and is actually a dynamically-sized array.

This library can convert uint to Bytes32 and vice-versa, if that helps any.

Best Answer

Related Solutions

[Ethereum] TypeError: Data location must be “memory” for parameter in function, but none was given

[Ethereum] Solidity: data type conversion from bytes to address/string/uint/int [ any library available? ]

Related Topic