Getting Error while decoding data emitted from an event

[aduttya]

I am having the issue when running

const eventTypes = [ 'bytes', 'uint8', 'bool', 'uint256[]' ]      
const data = '0x6f6e2774206b6e6f772077686174204920616d20646f696e670000000000000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000192d4f6ea000000000000000000000000000000000000000000000000000000000074cd16000000000000000000000000000000000000000000000000000000000034bf100000000000000000000000000000000000000000000000000000000000bc61ba'
 const decoded = ethers.utils.defaultAbiCoder.decode(eventTypes, data);
tx address = https://mumbai.polygonscan.com/tx/0xd6478454240d913b45588a8a3f0371774b007de52e528d328a1f52e57acf55df

Is there any alternative way to do this smoothly?

[ricmoo]

Can you include the error? Also, the event ABI and full event would be helpful too. Keep in mind if the event has any indexed fields, those aren’t included in the data, but are instead in the topics.

[aduttya]

ABI:

[ { "anonymous": false, "inputs": [ { "indexed": false, "internalType": "bytes", "name": "_name", "type": "bytes" }, { "indexed": false, "internalType": "uint8", "name": "_no", "type": "uint8" }, { "indexed": false, "internalType": "bool", "name": "_present", "type": "bool" }, { "indexed": false, "internalType": "uint256[]", "name": "_amounts", "type": "uint256[]" } ], "name": "UserCreated", "type": "event" }, { "inputs": [ { "internalType": "string", "name": "_name", "type": "string" }, { "internalType": "uint8", "name": "rool_no", "type": "uint8" }, { "internalType": "bool", "name": "_present", "type": "bool" }, { "internalType": "uint256[]", "name": "_amounts", "type": "uint256[]" } ], "name": "setUser", "outputs": [], "stateMutability": "nonpayable", "type": "function" } ]

Event:

event UserCreated(bytes _name, uint8 _no, bool _present, uint [] _amounts);Error:
Error: overflow [ See: https://links.ethers.org/v5-errors-NUMERIC_FAULT-overflow ] (fault="overflow", operation="toNumber", value="50401351668743717650321385172486565092639414675270070699981441774216693153792", code=NUMERIC_FAULT, version=bignumber/5.7.0) reason: 'overflow', code: 'NUMERIC_FAULT', fault: 'overflow', operation: 'toNumber', value: '50401351668743717650321385172486565092639414675270070699981441774216693153792'

There are no indexed values

I am just looking to store some data through data field in a transaction. If I can get a guide for it would be very helpful

[ricmoo]

Thanks.

There is definitely something wrong with the ABI or the data. To encode a bytes, the first 32 bytes of the data represent the offset, in this case it should be 0x0000…080 (it must start with 62 0’s and then 80). But you can see there is a bunch of non-zero data in the first 32 bytes, it’s invalid data for that ABI.

Since the offset is a 32-byte number (i.e. 0x6f6e…), is huge, it is larger than the total data available, that is why it is a numeric overflow.

My guess is the ABI is incorrect. Where did you get it from?

[aduttya]

I deployed a new contract here https://mumbai.polygonscan.com/address/0x9eB46e3eA77d1d19356BE6862528668840B60083#code and it is working now.
let me check with different data structures and by the end of the day (IST timezone) if there is no issue I will close it.
Can you refer to any resources to get deep knowledge about data encoding in EVM?

[ricmoo]

Sure thing, here is a the specification: https://docs.soliditylang.org/en/v0.8.19/abi-spec.html#events

There are a lot of caveats and nuances though, so I would generally suggest you use the Interface class rather than the ABI coder directly. But it is definitely good to know. :)