我正在使用web3.js v1.0.0-beta.34
和nodeJS v9.11.2
在smart contract
Kovan
上执行testnet
。同样的方法对我在Ropsten上使用另一个智能合约也适用。这是我通过回调收到的两个错误:
1。)
UnhandledPromiseRejectionWarning:错误:返回的错误:不足 资金。您尝试从中发送交易的帐户没有 足够的资金。必需183675000000并获得:0。
2。)
(节点:15422)UnhandledPromiseRejectionWarning:未处理的承诺 拒绝。该错误是由抛出异步内部引起的 没有捕获块或拒绝承诺 未使用.catch()处理。 (拒绝ID:1)
这是我的智能合约:
pragma solidity ^0.4.24;
contract Test2 {
address public customer;
bytes32 public productName;
struct Box {
uint size;
}
Box public box;
constructor() public {
box.size = 3;
customer = 0xDa3E3C75....;
productName = "0x576...";
}
function changeBox(uint _change) public {
box.size = _change;
}
function getBox() public returns (uint) {
return box.size;
}
}
下面是执行交易并使用web3和节点执行function changeBox
的JavaScript代码:
const Tx = require('ethereumjs-tx');
var Web3 = require('web3');
var web3 = new Web3(new Web3.providers.HttpProvider('https://kovan.infura.io/api_key'));
const contractAddress = '0x36075430619b21Fff798454e2D5C81E9C18DEe81';
var contractABI = new web3.eth.Contract(
[...json abi...], contractAddress);
var boxNum;
function changeBox(boxNum, callback) {
web3.eth.defaultAccount = "0x002D189c25958c60...";
const account = '0x002D189c2595...';
const privateKey = Buffer.from('240462d5...', 'hex');
const contractFunction = contractABI.methods.changeBox(Number(boxNum));
const functionAbi = contractFunction.encodeABI();
let estimatedGas;
let nonce;
contractFunction.estimateGas(function(error, gasAmount) {
if(!error) {
console.log('Estimated Gas : ' + gasAmount);
estimatedGas = gasAmount + 10000;
console.log('New Gas: ' + estimatedGas);
web3.eth.getTransactionCount(account).then(_nonce => {
nonce = _nonce.toString(16);
console.log("Nonce: " + nonce);
const txParams = {
gasPrice: estimatedGas,
gasLimit: 5000000,
to: contractAddress,
data: functionAbi,
from: account,
nonce: '0x' + nonce
};
const tx = new Tx(txParams);
tx.sign(privateKey);
const serializedTx = tx.serialize();
web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex')).on('receipt', receipt => {
callback(receipt);
});
});
}
else {
callback(error);
}
});
}
//calling the contract with value 6
changeBox(6, function(err, data) {
if (!err) {
console.log(data);
}
else {
console.log(err);
}});
答案 0 :(得分:3)
((Control)spOptionsValue.Children[loopIndex - 3]).Focus();
返回一个promiEvent,您可以在其上链接sendSignedTransaction
和then
:
catch
web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex'))
.on('receipt', receipt => {
callback(receipt);
}).then(() => {
// success
}).catch(() => {
// fail
});
之所以被抛出,是因为Promise被拒绝了,但是没有Unhandled promise rejection
处理程序。