How to get amount from a transaction ?

[jdelobel]

Hi,

I want to get the amount in the transaction detail.

When i call:

tronWeb.trx.getTransaction("0daa9f2507c4e79e39391ea165bb76ed018c4cd69d7da129edf9e95f0dae99e2").then(result => {console.log(JSON.stringify(result))});

I got a result but no amount inside:

{"ret":[{"contractRet":"SUCCESS"}],"signature":["220307de6341f7b59ff9563f50db3ab23ae53df0548aacdc6b569b094463cddd81a0a1e3e06b19bf344f94e25e8e5625374e81232ce8fb404db447666562661600"],"txID":"0daa9f2507c4e79e39391ea165bb76ed018c4cd69d7da129edf9e95f0dae99e2","raw_data":{"contract":[{"parameter":{"value":{"data":"49774683000000000000000000000000ce3747fa895a899209c10ef1b4a41141b51b8a48e7636a372dc6d1fa95122bc282de912888dace410099e5c28d9a86ec9421be5800000000000000000000000000000000000000000000000000000000005029840000000000000000000000000000000000000000000000000000000000989680","owner_address":"41880e4776dfcf38dfe00d399d31738abc773634e8","contract_address":"41eb8f23b15acbc0245a4dbbd820b9bde368b02d61"},"type_url":"type.googleapis.com/protocol.TriggerSmartContract"},"type":"TriggerSmartContract"}],"ref_block_bytes":"cfbe","ref_block_hash":"071499db194adbc4","expiration":1551102345000,"fee_limit":10000000,"timestamp":1551102288525},"raw_data_hex":"0a02cfbe2208071499db194adbc440a8fe9da7922d5af001081f12eb010a31747970652e676f6f676c65617069732e636f6d2f70726f746f636f6c2e54726967676572536d617274436f6e747261637412b5010a1541880e4776dfcf38dfe00d399d31738abc773634e8121541eb8f23b15acbc0245a4dbbd820b9bde368b02d6122840149774683000000000000000000000000ce3747fa895a899209c10ef1b4a41141b51b8a48e7636a372dc6d1fa95122bc282de912888dace410099e5c28d9a86ec9421be5800000000000000000000000000000000000000000000000000000000005029840000000000000000000000000000000000000000000000000000000000989680708dc59aa7922d900180ade204"}

Do you know how i can have the transaction's amount?

Thanks!

[ferdinand026]

@jdelobel All parameters passed when triggering a smart contract are encoded according to the solidity abi encoding rules. And this is a guide for decoding parameters.

[jdelobel]

Hi,

Thanks for the doc.

I have tried the javascript function decodeParams finded in the doc:

async function decodeParams(types, output, ignoreMethodHash) {

    if (!output || typeof output === 'boolean') {
        ignoreMethodHash = output;
        output = types;
    }

    if (ignoreMethodHash && output.replace(/^0x/, '').length % 64 === 8)
        output = '0x' + output.replace(/^0x/, '').substring(8);

    const abiCoder = new AbiCoder();

    if (output.replace(/^0x/, '').length % 64)
        throw new Error('The encoded string is not valid. Its length must be a multiple of 64.');
    return abiCoder.decode(types, output).reduce((obj, arg, index) => {
        if (types[index] == 'address')
            arg = ADDRESS_PREFIX + arg.substr(2).toLowerCase();
        obj.push(arg);
        return obj;
    }, []);
}


async function main() {

    let data = '49774683000000000000000000000000ce3747fa895a899209c10ef1b4a41141b51b8a48e7636a372dc6d1fa95122bc282de912888dace410099e5c28d9a86ec9421be5800000000000000000000000000000000000000000000000000000000005029840000000000000000000000000000000000000000000000000000000000989680'

    result = await decodeParams(['address', 'uint256'], data, true)
    console.log('')
    console.log(result)
}
main();

and it seem the result does not contains the amount:

[
  '41ce3747fa895a899209c10ef1b4a41141b51b8a48',
  104659918954878265279567651122840997639927349909107451498849944124540751822424n
]

Maybe i have to do another step with the 104659918954878265279567651122840997639927349909107451498849944124540751822424n value?

Thanks.

[Satan-web3]

Obviously the output doesn't match the types. So you may need to find the correct abi.