使用转账功能发送 ERC20 代币

Question

我对 Solidity 编程还很陌生，我目前正在尝试在 Remix 中运行一个简单的智能合约，如下所示：

pragma solidity ^0.8.0;

import "github.com/OpenZeppelin/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol";

contract Swap  {
    address public owner;
    uint256 public balance;
    
    event TransferReceived(address _from, uint _amount);
    event TransferSent(address _from, address _destAddr, uint _amount);
    
    constructor() {
        owner = msg.sender;
    }
    
    receive() payable external {
        balance += msg.value;
        emit TransferReceived(msg.sender, msg.value);
    }    
    
    function withdraw(uint amount, address payable destAddr) public {
        require(msg.sender == owner, "Only owner can withdraw funds"); 
        require(amount <= balance, "Insufficient funds");
        
        destAddr.transfer(amount);
        balance -= amount;
        emit TransferSent(msg.sender, destAddr, amount);
    }
    
    function transferERC20(IERC20 token, address to, uint256 amount) public {
        require(msg.sender == owner, "Only owner can withdraw funds"); 
        uint256 erc20balance = token.balanceOf(address(this));
        require(amount <= erc20balance, "balance is low");
        token.transfer(to, amount);
        emit TransferSent(msg.sender, to, amount);
    }    
}

虽然我可以成功发送 BNB 并调用 withdraw 函数，提供发送的值和我在 BSC 测试网中的钱包地址，但我在运行 transferERC20 函数时遇到了问题。调用此方法时我得到的唯一输出是以下消息：

气体估算错误并显示以下消息（见下文）。这 事务执行可能会失败。是否要强制发送？ 内部 JSON-RPC 错误。 {“代码”：-32000，“消息”：“执行 还原”}

我尝试了几个在 testnet.bscscan 网站上为 BNB 找到的不同地址，同时确保合约有足够的资金进行转账，但我没有成功。

有人可以建议我的合同/设置可能出了什么问题吗？我是否正确地进行了这种转移？

Answer 1

• 修复构造器

  constructor() {
        // payable allows payment of ether with a call.
        owner = payable(msg.sender);
    }
  

• 确保满足require 声明

    require(msg.sender == owner, "Only owner can withdraw funds"); 
    require(amount <= balance, "Insufficient funds");
  

• 检查您是否连接到正确的网络