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October 1, 2019 02:17
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Using bytes32 with caver-js
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const Caver = require('caver-js'); | |
const caver = new Caver('https://api.baobab.klaytn.net:8651'); | |
const acct = caver.klay.accounts.privateKeyToAccount('your_private_key') | |
caver.klay.accounts.wallet.add(acct) | |
/* | |
We will use the following contract to demonstrate the use of bytes32: | |
pragma solidity 0.4.24; | |
contract StringStorage { | |
bytes32 storedData; | |
function set(bytes32 x) public { | |
storedData = x; | |
} | |
function get() public view returns (bytes32) { | |
return storedData; | |
} | |
} | |
*/ | |
// Use the following ABI for the above contract | |
const ABI = [ | |
{ | |
"constant": false, | |
"inputs": [ | |
{ | |
"name": "x", | |
"type": "bytes32" | |
} | |
], | |
"name": "set", | |
"outputs": [], | |
"payable": false, | |
"stateMutability": "nonpayable", | |
"type": "function" | |
}, | |
{ | |
"constant": true, | |
"inputs": [], | |
"name": "get", | |
"outputs": [ | |
{ | |
"name": "", | |
"type": "bytes32" | |
} | |
], | |
"payable": false, | |
"stateMutability": "view", | |
"type": "function" | |
} | |
]; | |
// assume there is a StringStorage contract deployed at 0x9252098B64E6904Fe9Cf4C8F5785e567869F4a21 | |
async function test() { | |
const contract = new caver.klay.Contract(ABI, '0x9252098B64E6904Fe9Cf4C8F5785e567869F4a21'); | |
const hexText = caver.utils.asciiToHex('test'); // Note that `fromAscii` is deprecated | |
const padded = caver.utils.padRight(hexText, 64); // Right padding | |
const txSet = contract.methods.set(padded); | |
txSet.send({ | |
from: acct.address, | |
gas: 3000000 | |
}) | |
.on('transactionHash', function(hash) { | |
console.log(">>> tx_hash: ", hash); | |
}) | |
.on('receipt', function(receipt) { | |
console.log(">>> receipt: ", receipt); | |
}) | |
.on('error', function (err) { | |
console.log(err); | |
}) | |
} | |
test(); |
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