Withdraw 函数 send 仅适用于 "address payable" 类型的对象

Question

pragma solidity >=0.6.0 <0.9.0;

//import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol"; ao importar este contracto o debaixo nao seria necessario mas usamos para ter um melhor entendimento do contrato

interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

  function description() external view returns (string memory);

  function version() external view returns (uint256);

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}

contract FundMe {

    //track de todos os endereços que interagiram com o contracto
    mapping(address => uint256) public addressToAmmountFunded;

    address public owner;

    //tudo o que é feito nos constructor() é automaticamente aplicado na criaçao do smart contract 
    constructor() {
    //como o primeiro msg.sender é o criador do smart contract fica automaticamente como owner
      owner = msg.sender;
    }

    function fund() public payable {
        uint256 minimunUSD = 500 * 10 ** 18; //define que minimunUSD tem de ser 50 mas é preciso multiplicar por 10^18 por estarmos a usar WEI
        require(getConversionRate(msg.value) >= minimunUSD, "You need to invest more than 500USD in xxx tokens!"); // Se valor enviado nao for suficiente o ele reverte a transacçao
        addressToAmmountFunded[msg.sender] += msg.value;
        //contrato que so aceita ETH por isso é necessario fazer uma conversao para um USD conversion rate
    }

    function getVersion() public view returns (uint256){
        AggregatorV3Interface priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e); // contrato definido encontrado em https://docs.chain.link/docs/ethereum-addresses/ que é ETH/USD
        return priceFeed.version();
    }

    function getPrice() public view returns(uint256){
        AggregatorV3Interface priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e);
        (,int256 answer,,,) = priceFeed.latestRoundData(); // O numero de virgulas representam as variaves em latest round data que nao estao a ser usadas
         return uint256(answer * 10000000000);
    }

    function getLatestUpdate() public view returns(uint256){
        AggregatorV3Interface priceFeed = AggregatorV3Interface(0x8A753747A1Fa494EC906cE90E9f37563A8AF630e);
        (,,,uint256 updatedAt,) = priceFeed.latestRoundData(); // O numero de virgulas representam as variaves em latest round data que nao estao a ser usadas
         return updatedAt;
    }
    // 1000000000
    function getConversionRate(uint256 ethAmount) public view returns(uint256){
        uint256 ethPrice = getPrice();
        uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1000000000000000000 ; //divisao por 10^18 casas decimais do ethereum
        return ethAmountInUsd;
    }

    //este modificador faz com que o codigo de withdraw() só corra depois de executar o require
    modifier onlyOwner {
      require(msg.sender == owner);
      _;
    }
    
    function withdraw() payable onlyOwner public {
      msg.sender.transfer(address(this).balance);
    }
}

在最后一个函数 withdraw() 中，我收到错误类型错误：“发送”和“转移”仅适用于“应付地址”类型的对象，而不适用于“地址”类型的对象。

我正在使用 REMIX 的编译器版本 0.8.7 IDE

我已经仔细检查了所有的智能合约，但我看不出任何解决方法。

我想用这个功能做的是检查存储在智能合约上的所有价值，并将其提取到部署智能合约的所有者地址

Answer 1

由于你修改了onlyOwner，只有所有者才能调用。所以 msg.sender 实际上是 owner。所有者应付款。如果您的代码中没有其他错误，这应该可以解决它：

     address payable owner;

Withdraw 函数 send 仅适用于 "address payable" 类型的对象

Withdraw function send is only available for objects of type "address payable"

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