Question

我试图在以太坊测试网上设置一个基本的众筹，我使用的可靠性代码是

中的基本示例。

按照该指南中所述的步骤进行操作。

问题首先是由于第一行，以太坊钱包不接受编译的代码： contract token { function transfer(address receiver, uint amount){ } }

具体来说，它的函数返回一个未使用的局部变量的警告，并且不会编译。除了在函数中定义空变量之外，还有其他方法吗？

第二个问题是在它如上所述进行了修改后，它可以工作。但是当它将令牌发送到发送以太币的钱包时，金额总是锁定在0.00令牌上。

完整代码：

pragma solidity ^0.4.2;
contract token { function transfer(address receiver, uint amount){ receiver; amount; } }

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;
    bool fundingGoalReached = false;
    event GoalReached(address beneficiary, uint amountRaised);
    event FundTransfer(address backer, uint amount, bool isContribution);
    bool crowdsaleClosed = false;

    /* data structure to hold information about campaign contributors */

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

    /* The function without a name is the default function that is called whenever anyone sends funds to a contract */
    function () payable {
        if (crowdsaleClosed) throw;
        uint amount = msg.value;
        balanceOf[msg.sender] = amount;
        amountRaised += amount;
        tokenReward.transfer(msg.sender, amount / price);
        FundTransfer(msg.sender, amount, true);
    }

    modifier afterDeadline() { if (now >= deadline) _; }

    /* checks if the goal or time limit has been reached and ends the campaign */
    function checkGoalReached() afterDeadline {
        if (amountRaised >= fundingGoal){
            fundingGoalReached = true;
            GoalReached(beneficiary, amountRaised);
        }
        crowdsaleClosed = true;
    }


    function safeWithdrawal() afterDeadline {
        if (!fundingGoalReached) {
            uint amount = balanceOf[msg.sender];
            balanceOf[msg.sender] = 0;
            if (amount > 0) {
                if (msg.sender.send(amount)) {
                    FundTransfer(msg.sender, amount, false);
                } else {
                    balanceOf[msg.sender] = amount;
                }
            }
        }

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

编辑：我忘了提及导致这一点的步骤，即令牌创建/股东协会使用指南中提供的代码。

Answer 1

我遇到了同样的问题。我通过实际定义transfer函数来解决它，因为ethereum.org中的示例提供了一个空函数。

我取而代之：

contract token { function transfer(address receiver, uint amount){  } }

由此：

contract token {    
    event Transfer(address indexed from, address indexed to, uint256 value);
    function transfer(address _to, uint256 _value) {
        if (_to == 0x0) throw;
        Transfer(msg.sender, _to, _value);
    }

}

对于您的第二个问题，您是否确实已确认创建的令牌是否已实际发送？你发给人群销售合同有多少以太？您的令牌似乎使用两位小数，如果您定义了每个令牌的以太网成本＆＃34;在示例中，您不应该向群众销售合同发送少于0.05的以太币。

希望它有所帮助！

以太坊，crowdsale将0.00令牌返还给钱包

1 个答案: