使用轉賬 function 發送 ERC20 代幣

Question

我對 Solidity 編程很陌生，我目前正在嘗試在 Remix 中運行一個簡單的智能合約，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);
    }    
}

雖然我可以成功發送 BNB 並調用withdraw function 提供發送的值和我在 BSC 測試網中的錢包地址，但在運行transferERC20 function 時遇到問題。 我在調用此方法時得到的唯一 output 是以下消息：

氣體估計錯誤並顯示以下消息（見下文）。 事務執行可能會失敗。 是否要強制發送？ 內部 JSON-RPC 錯誤。 {“代碼”：-32000，“消息”：“執行恢復”}

我嘗試了幾個在 testnet.bscscan 網站上為 BNB 找到的不同地址，同時確保合約有足夠的資金進行轉賬，但我沒有成功。

有人可以建議我的合同/設置可能出了什么問題嗎？ 我是否正確進行此轉移？

Answer 1

• 修復構造器

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

• 確保滿足這些require語句

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

• 檢查您是否連接到正確的網絡