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我试图通过元掩码支付合约地址并让它调用一个 buyTokens 函数,但交易一直失败。合约有足够的代币余额,因为我通过元掩码成功地将 ERC20 代币发送到了合约地址。只有当我将以太币发送到合约地址时,它才会失败。我尝试了默认的气体限制,并尝试在 metamask 中将气体设置为 200000。请帮我。

我在本地主机 genache 上运行

pragma solidity ^0.5.0;

import "./Token.sol";

// rate is 1 token = 0.01 ether

contract Crowdsale {

    constructor() public {
        rate = 100;
        on = true;
    }

    Token public token;
    address payable wallet;
    uint256 public rate;
    bool on;

    event TokenPurchase(address recipient, uint256 numPaid, uint256 numTokensPurchased);

    function buyTokens() public payable {
        
        require(msg.value > 0 && on == true);
        uint256 tokenAmount = _getTokenAmount(msg.value);
        require(token.balanceOf(address(this)) >= tokenAmount);
        token.transfer(msg.sender, tokenAmount);
        emit TokenPurchase( msg.sender, msg.value, tokenAmount);

    }
    
    function () external payable{
        buyTokens();
    }
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1 回答 1

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直接打电话试试buyTokensfallback功能只能依靠 2300 gas 可用,不足以调用buyTokens

https://solidity.readthedocs.io/en/v0.5.0/contracts.html?highlight=fallback#fallback-function

于 2020-07-07T13:08:07.087 回答