不能多次退出Crowdsale

Question

我使用的是众包合同(如下所示)，在Ropsten网络上，我刚刚设定了创建目标:1 ETH，将其发送到众包地址，然后我可以撤回到受益人地址，但当我第二次发送ETH时，我不能再撤回它了。

我发现自己需要一个Crowdsale代码，可以随时撤回创建，也需要一种自动将ETH从众包发送到ETH地址的方法，就像有人向众包发送1条ETH一样：

• 那个人收到代币
• Crowdsale将该ETH发送到特定的ETH地址
• 该地址的所有者可以随时/多次提取该地址。

这是我正在尝试使用的代码，但只有第一次提取有效(第二次退出)

pragma solidity ^0.4.18;

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

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


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

    /**
     * Constructor function
     *
     * Setup the owner
     */
    constructor(
        address ifSuccessfulSendTo,
        uint fundingGoalInEthers,

        uint milietherCostOfEachToken,
        address addressOfTokenUsedAsReward
    ) public {
        beneficiary = ifSuccessfulSendTo;
        fundingGoal = fundingGoalInEthers * 1 ether;

        price = milietherCostOfEachToken * 0.0001 ether;
        tokenReward = token(addressOfTokenUsedAsReward);
    }

    /**
     * Fallback function
     *
     * The function without name is the default function that is called whenever anyone sends funds to a contract
     */
    function () payable public {

        uint amount = msg.value;
        balanceOf[msg.sender] += amount;
        amountRaised += amount;
        tokenReward.transfer(msg.sender, amount * 10**18 / price);
       emit FundTransfer(msg.sender, amount, true);
    }


    /**
     * Check if goal was reached
     *
     * Checks if the goal or time limit has been reached and ends the campaign
     */
    function checkGoalReached() public  {
        if (amountRaised >= fundingGoal){
            fundingGoalReached = true;
            emit GoalReached(beneficiary, amountRaised);
        }

    }


    /**
     * Withdraw the funds
     *
     * Checks to see if goal or time limit has been reached, and if so, and the funding goal was reached,
     * sends the entire amount to the beneficiary. If goal was not reached, each contributor can withdraw
     * the amount they contributed.
     */
    function safeWithdrawal() public  {
        if (!fundingGoalReached) {
            uint amount = balanceOf[msg.sender];
            balanceOf[msg.sender] = 0;
            if (amount > 0) {
                if (msg.sender.send(amount)) {
                   emit FundTransfer(msg.sender, amount, false);
                } else {
                    balanceOf[msg.sender] = amount;
                }
            }
        }

        if (fundingGoalReached && beneficiary == msg.sender) {
            if (beneficiary.send(amountRaised)) {
               emit FundTransfer(beneficiary, amountRaised, false);
            } else {
                //If we fail to send the funds to beneficiary, unlock funders balance
                fundingGoalReached = false;
            }
        }
    }

Answer 1

要自动将资金发送到受益人地址，您可以使用transfer

function () payable public {

    uint amount = msg.value;
    balanceOf[msg.sender] += amount;
    amountRaised += amount;
    tokenReward.transfer(msg.sender, amount * 10**18 / price);
    emit FundTransfer(msg.sender, amount, true);

    // Forward funds immediately to beneficiary
    beneficiary.transfer(amount);
}