如何在 solidity "The constructor should be payable if you send value." 中解决这个错误？

Question

在此 solidity 代码中，finalizeRequest() 给出了运行时间错误。这是错误：

Campaign.finalizeRequest(uint256) 0x692...77b3a

transact to Campaign.finalizeRequest errored: VM error: revert.
revert  The transaction has been reverted to the initial state.
Note: The constructor should be payable if you send value.  Debug the transaction to get more information.

代码如下：

pragma solidity ^0.4.17;

contract Campaign {
    struct Request {
        string description;
        uint value;
        address  recipient;
        bool complete;
        uint approvalCount;
        mapping (address => bool) approvals;
    }

    address public manager;
    uint public minimumContribution;
    // address[] public approvers;
    mapping (address => bool) public approvers;
    Request[] public requests;
    uint public approversCount;


    function Campaign(uint minimum) public {
        manager=msg.sender;
        minimumContribution=minimum;
    }

    function contribute() public payable {
        require(msg.value>minimumContribution);
        // approvers.push(msg.sender);
        approvers[msg.sender]=true;
        approversCount++;
    }

    function createRequest(string description,uint value,address  recipient) public restricted {
        // require (approvers[msg.sender]);    
        Request memory newRequest=Request({description:description,value:value,recipient:recipient,complete:false,approvalCount:0});
        requests.push(newRequest);

    }

    function approveRequest(uint index) public {
        Request storage request=requests[index];

        require(approvers[msg.sender]);
        require(!request.approvals[msg.sender]);
        request.approvals[msg.sender]=true;
        request.approvalCount++;
    } 

    function finalizeRequest(uint index) public restricted {
        Request storage request = requests[index];

        require(request.approvalCount>=(approversCount/2));
        require(!request.complete);
        request.recipient.transfer(request.value);
        request.complete=true;

    } 

    modifier restricted() {
        require (msg.sender == manager);
        _;
    }
}

据我所知，当我在 finalizeRequest() 函数中注释掉 request.recipient.transfer(request.value); 时，不会抛出运行time 错误。所以错误似乎在这行代码中。

Answer 1

据我所知，您的 finalizeRequest() 函数包含定义的以太币传输 request.recipient.transfer(request.value);，因此您需要将 finalizeRequest() 设置为 payable。

将 finalizeRequest() 替换为：

function finalizeRequest(uint index) public restricted payable {
    Request storage request = requests[index];
    require(request.approvalCount>=(approversCount/2));
    require(!request.complete);
    request.recipient.transfer(request.value);
    request.complete=true;
}

Thumb Rule: Whenever you are sending or receiving ether in any function, mark it as payable.

您需要 payable 关键字的原因得到了很好的解释 here。

如何在 solidity "The constructor should be payable if you send value." 中解决这个错误？

How to resolve this error in solidity "The constructor should be payable if you send value."?

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