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@tomconte
Created December 13, 2016 09:32
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Compiling and deploying an Ethereum Smart Contract, using solc and web3.
const fs = require('fs');
const solc = require('solc');
const Web3 = require('web3');
// Connect to local Ethereum node
const web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
// Compile the source code
const input = fs.readFileSync('Token.sol');
const output = solc.compile(input.toString(), 1);
const bytecode = output.contracts['Token'].bytecode;
const abi = JSON.parse(output.contracts['Token'].interface);
// Contract object
const contract = web3.eth.contract(abi);
// Deploy contract instance
const contractInstance = contract.new({
data: '0x' + bytecode,
from: web3.eth.coinbase,
gas: 90000*2
}, (err, res) => {
if (err) {
console.log(err);
return;
}
// Log the tx, you can explore status with eth.getTransaction()
console.log(res.transactionHash);
// If we have an address property, the contract was deployed
if (res.address) {
console.log('Contract address: ' + res.address);
// Let's test the deployed contract
testContract(res.address);
}
});
// Quick test the contract
function testContract(address) {
// Reference to the deployed contract
const token = contract.at(address);
// Destination account for test
const dest_account = '0x002D61B362ead60A632c0e6B43fCff4A7a259285';
// Assert initial account balance, should be 100000
const balance1 = token.balances.call(web3.eth.coinbase);
console.log(balance1 == 1000000);
// Call the transfer function
token.transfer(dest_account, 100, {from: web3.eth.coinbase}, (err, res) => {
// Log transaction, in case you want to explore
console.log('tx: ' + res);
// Assert destination account balance, should be 100
const balance2 = token.balances.call(dest_account);
console.log(balance2 == 100);
});
}
@ADitya024
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ADitya024 commented Apr 19, 2018

Hello guys,
I am facing a error : TypeError: Cannot read property 'bytecode' of undefined
occuring on line : const bytecode = output.contracts['Token'].bytecode;

@izotx
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izotx commented Jun 19, 2018

@ADitya024
Change it to:
output.contracts['Token']["bytecode"];

@shchye95
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Hi guys,

I am currently trying to adopt this source code for my school project. But may I know what is the folder structure for this project? Because I can't seemed to grasp how the code retrieve the Token.sol (Line 9)

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