即使我使用官方以太坊网页上的示例,也无法发送交易

Question

我用这个例子写了Crowdsale .但我无法发送事务,我的测试失败并出现错误:

 Contract: Crowdsale should accept payments after start:
     AssertionError: expected promise to be fulfilled but it was rejected with 'Error: VM Exception while processing the transaction: revert'

我试图将汽油价格设置为这样的交易,crowdsale.sendTransaction({value, from: buyer, gas: 4712388})但它对我没有帮助.

我的众筹:

pragma solidity ^0.4.16;

interface token {
  function transfer(address receiver, uint amount) external;
}

contract Crowdsale {
  address public beneficiary;
  uint public fundingGoal;
  uint public amountRaised;
  uint public deadline;
  uint public price;
  token public tokenReward;
  mapping(address => uint256) public balanceOf;

  event FundTransfer(address backer, uint amount, bool isContribution);

  function Crowdsale(
    address ifSuccessfulSendTo,
    uint fundingGoalInEthers,
    uint durationInMinutes,
    uint etherCostOfEachToken,
    address addressOfTokenUsedAsReward
  ) public {
    beneficiary = ifSuccessfulSendTo;
    fundingGoal = fundingGoalInEthers * 1 ether;
    deadline = now + durationInMinutes * 1 minutes;
    price = etherCostOfEachToken * 1 ether;
    tokenReward = token(addressOfTokenUsedAsReward);
  }

  function () public payable {
    uint amount = msg.value;
    balanceOf[msg.sender] += amount;
    amountRaised += amount;
    tokenReward.transfer(msg.sender, amount / price);
    FundTransfer(msg.sender, amount, true);
  }
}

我的测试(我以这些测试为例):

// You can find all those helpers here: https://github.com/OpenZeppelin/zeppelin-solidity/blob/master/test/helpers
import ether from '../helpers/ether';
import { advanceBlock } from '../helpers/advanceToBlock';
import { increaseTimeTo, duration } from '../helpers/increaseTime';
import latestTime from '../helpers/latestTime';

const BigNumber = web3.BigNumber;

const should = require('chai')
  .use(require('chai-as-promised'))
  .use(require('chai-bignumber')(BigNumber))
  .should();

const Crowdsale = artifacts.require('Crowdsale');
const Coin = artifacts.require('Coin');

contract('Crowdsale', accounts => {
  let startTime;

  let crowdsale;
  let token;

  const value = ether(8);
  const buyer = accounts[1];
  const tokenReward = accounts[2];
  const beneficiary = accounts[2];

  before(async () => {
    // Advance to the next block to correctly read time in the solidity "now" function interpreted by testrpc
    await advanceBlock();
  });

  beforeEach(async () => {
    token = await Coin.new();

    // Transfer an amount to address of token used as reward
    const tokenRewardAmount = 1000000;
    token.transfer(tokenReward, tokenRewardAmount);

    startTime = latestTime() + duration.minutes(1);

    crowdsale = await Crowdsale.new(beneficiary, 200, 30, 1, tokenReward);
  });

  it('should accept payments after start', async () => {
    await increaseTimeTo(startTime);
    await crowdsale.sendTransaction({value, from: buyer, gas: 4712388}).should.be.fulfilled;
  });
});

我的硬币:

pragma solidity ^0.4.19;

import 'zeppelin-solidity/contracts/token/ERC20/MintableToken.sol';

contract Coin is MintableToken {
  uint8 public decimals = 0;
  uint public initialSupply = 1000000 * 10 ** uint(decimals); // 1,000,000;
  string public name = "My Coin";
  string public symbol = "XMY";

  function Coin() public {
    totalSupply_ = initialSupply;
    balances[msg.sender] = totalSupply_;
  }
}

我正在开发一个"博彩公司",其中一个众筹代表一个事件.这意味着我将创建数十个众筹,我不能使用Zeppelin的众筹,因为它标记了一个令牌.那么,有没有其他方法来创建一个没有铸造令牌的众筹？我认为应该有其他的方式,因为以太坊的网页上的例子没有铸造工作,但由于某种原因,它对我不起作用.我的错误在哪里？我该如何解决这个问题？

Answer 1

据我了解您的问题，您正在尝试向您的众筹合同发送一些资金。

更改这一行：

await crowdsale.sendTransaction({value, from: buyer, gas: 4712388}).should.be.fulfilled;

对此：

await web3.eth.sendTransaction({
  from: buyer, 
  to: crowdsale,
  value: value,  
  gas: 4712388
}).should.be.fulfilled;