У меня есть следующий контракт на голосование :
pragma solidity ^0.4.11;
/// @title Voting with delegation.
contract Ballot {
// This declares a new complex type which will
// be used for variables later.
// It will represent a single voter.
struct Voter {
uint weight; // weight is accumulated by delegation
bool voted; // if true, that person already voted
address delegate; // person delegated to
uint vote; // index of the voted proposal
}
// This is a type for a single proposal.
struct Proposal {
bytes32 name; // short name (up to 32 bytes)
uint voteCount; // number of accumulated votes
}
address public chairperson;
// This declares a state variable that
// stores a `Voter` struct for each possible address.
mapping(address => Voter) public voters;
// A dynamically-sized array of `Proposal` structs.
Proposal[] public proposals;
/// Create a new ballot to choose one of `proposalNames`.
function Ballot(bytes32[] proposalNames) internal {
chairperson = msg.sender;
voters[chairperson].weight = 1;
// For each of the provided proposal names,
// create a new proposal object and add it
// to the end of the array.
for (uint i = 0; i < proposalNames.length; i++) {
// `Proposal({...})` creates a temporary
// Proposal object and `proposals.push(...)`
// appends it to the end of `proposals`.
proposals.push(Proposal({
name: proposalNames[i],
voteCount: 0
}));
}
}
function getProposalsCount() public constant returns(uint) {
return proposals.length;
}
function getProposal(uint index) public constant returns(bytes32, uint) {
return (proposals[index].name, proposals[index].voteCount);
}
// Give `voter` the right to vote on this ballot.
// May only be called by `chairperson`.
function giveRightToVote(address voter) public {
// If the argument of `require` evaluates to `false`,
// it terminates and reverts all changes to
// the state and to Ether balances. It is often
// a good idea to use this if functions are
// called incorrectly. But watch out, this
// will currently also consume all provided gas
// (this is planned to change in the future).
require((msg.sender == chairperson) && !voters[voter].voted && (voters[voter].weight == 0));
voters[voter].weight = 1;
}
/// Delegate your vote to the voter `to`.
function delegate(address to) public {
// assigns reference
Voter storage sender = voters[msg.sender];
require(!sender.voted);
// Self-delegation is not allowed.
require(to != msg.sender);
// Forward the delegation as long as
// `to` also delegated.
// In general, such loops are very dangerous,
// because if they run too long, they might
// need more gas than is available in a block.
// In this case, the delegation will not be executed,
// but in other situations, such loops might
// cause a contract to get "stuck" completely.
while (voters[to].delegate != address(0)) {
to = voters[to].delegate;
// We found a loop in the delegation, not allowed.
require(to != msg.sender);
}
// Since `sender` is a reference, this
// modifies `voters[msg.sender].voted`
sender.voted = true;
sender.delegate = to;
Voter storage delegate2 = voters[to];
if (delegate2.voted) {
// If the delegate already voted,
// directly add to the number of votes
proposals[delegate2.vote].voteCount += sender.weight;
} else {
// If the delegate did not vote yet,
// add to her weight.
delegate2.weight += sender.weight;
}
}
/// Give your vote (including votes delegated to you)
/// to proposal `proposals[proposal].name`.
function vote(uint proposal) public {
Voter storage sender = voters[msg.sender];
require(!sender.voted);
sender.voted = true;
sender.vote = proposal;
// If `proposal` is out of the range of the array,
// this will throw automatically and revert all
// changes.
proposals[proposal].voteCount += sender.weight;
}
/// @dev Computes the winning proposal taking all
/// previous votes into account.
function winningProposal() public constant
returns (uint winningProposal2)
{
uint winningVoteCount = 0;
for (uint p = 0; p < proposals.length; p++) {
if (proposals[p].voteCount > winningVoteCount) {
winningVoteCount = proposals[p].voteCount;
winningProposal2 = p;
}
}
}
// Calls winningProposal() function to get the index
// of the winner contained in the proposals array and then
// returns the name of the winner
function winnerName() public constant
returns (bytes32 winnerName2)
{
winnerName2 = proposals[winningProposal()].name;
}
}
Я развернул его по адресу rinkeyby (0xC9F933b8326FF672259445459FA720667939A7a9) с начальным массивом ['яблоко', 'апельсин', 'манго']. Когда я пытаюсь запустить следующие функции из web3js, я получаю значения 0x или null. Вот код javascript:
var Web3 = require('web3');
if (typeof window.web3 !== "undefined" && typeof window.web3.currentProvider !== "undefined") {
var web3 = new Web3(window.web3.currentProvider);
} else {
var web3 = web3.setProvider(new web3.providers.HttpProvider());
}
var selectedAccount;
web3.eth.getAccounts(function (err, accounts) { if (!err && accounts.length > 0) selectedAccount = accounts[0]; });
var abiArray = [{ "constant": false, "inputs": [{ "name": "proposal", "type": "uint256" }], "name": "vote", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [{ "name": "", "type": "uint256" }], "name": "proposals", "outputs": [{ "name": "name", "type": "bytes32" }, { "name": "voteCount", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "chairperson", "outputs": [{ "name": "", "type": "address" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "name": "to", "type": "address" }], "name": "delegate", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "winningProposal", "outputs": [{ "name": "winningProposal2", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "getProposalsCount", "outputs": [{ "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [{ "name": "voter", "type": "address" }], "name": "giveRightToVote", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [{ "name": "", "type": "address" }], "name": "voters", "outputs": [{ "name": "weight", "type": "uint256" }, { "name": "voted", "type": "bool" }, { "name": "delegate", "type": "address" }, { "name": "vote", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [{ "name": "index", "type": "uint256" }], "name": "getProposal", "outputs": [{ "name": "", "type": "bytes32" }, { "name": "", "type": "uint256" }], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "winnerName", "outputs": [{ "name": "winnerName2", "type": "bytes32" }], "payable": false, "stateMutability": "view", "type": "function" }, { "inputs": [{ "name": "proposalNames", "type": "bytes32[]" }], "payable": false, "stateMutability": "nonpayable", "type": "constructor" }];
var MyContract = web3.eth.contract(abiArray);
var contractInstance = MyContract.at('0xC9F933b8326FF672259445459FA720667939A7a9');
function get_data() {
var callback = function (error, result) {
if (!error) {
console.log(result);
}
else {
console.error(error);
}
};
contractInstance.getProposalsCount(callback);
contractInstance.getProposal(0, callback);
contractInstance.getProposal(1, callback);
contractInstance.chairperson(callback);
}
Вы должны передать массив строк следующим образом ["0x123...", "0x345..."]