使用介面從其他智能合約購買代幣

我有兩個單獨的契約，比如說Token和BuyFrom。

pragma solidity >=0.4.22 <0.7.0;

interface InterfaceToken {
   function invest(address contributor) external payable;
}

contract Token {
   string public name = "Token";
   string public symbol = "TKN";
   uint public decimals = 0;
   uint tokenPrice = 1000000000000000;

   uint public supply;
   address public founder;
   address payable public deposit;

   mapping(address => uint) public balances;

   constructor(address payable _deposit, address _founder) public{
       supply = 300000;
       deposit = _deposit;
       founder = _founder;
       balances[founder] = supply;
   }

   function invest(address contributor) public payable {
       uint tokens = msg.value / tokenPrice;

       balances[contributor] += tokens;
       balances[founder] -= tokens;

       deposit.transfer(msg.value);
   }
}

我想BuyFrom使用界面購買代幣。但它不起作用。

pragma solidity >=0.4.22 <0.7.0;

import 'Token.sol';

contract BuyFrom {
   address payable private token;

   constructor(address payable _token) public {
       token = _token;
   }

   function buyToken(address contributor) external payable {
      InterfaceToken(token).invest(contributor);
   }
}

我做錯了什麼？

由於InterfaceToken(token).invest是外部呼叫（即，對另一個合約中的函式），您需要傳遞您的函式收到的值。

換句話說，改變這個：

InterfaceToken(token).invest(contributor);

對此：

InterfaceToken(token).invest.value(msg.value)(contributor);

引用自：https://ethereum.stackexchange.com/questions/83520