Blockchain 使用BNB从合同中购买代币时出现的问题

我正在创建这个智能合约，它创建并将所有代币添加到我的钱包中。 然后我把钱包里的所有代币都寄到我的合同里

然而，当我从另一个钱包里给BNB寄去合同时，我想让他归还我合同中的一些代币

执行此操作时，传输失败并发送以下错误消息：

警告！合同执行期间遇到错误[汽油用完]

佩剑是一种天然气，与天然气相反

交易详情：

智能合约：

pragma-solidity^0.8.0；
接口IERC20{
函数totalSupply（）外部视图返回（uint256）；
（地址账户）外部视图返回的功能余额（uint256）；
功能允许（地址所有者、地址使用者）外部视图返回（uint256）；
功能转移（地址接收人，uint256金额）外部返回（bool）；
职能部门批准（地址支出人，uint256金额）外部退货（bool）；
函数transferFrom（地址发送方、地址接收方、uint256金额）外部返回（bool）；
事件传输（地址索引自，地址索引至，uint256值）；
事件批准（地址索引所有者、地址索引支出者、uint256值）；}
合同ERC20Basic为IERC20{
字符串public常量name=“ByeSeel”；
字符串公共常量symbol=“BYS”；
uint8公共常量小数=18；
事件批准（地址索引令牌所有者、地址索引支出者、uint令牌）；
事件传输（地址索引自、地址索引至、uint令牌）；
映射（地址=>uint256）余额；
允许映射（地址=>mapping（地址=>uint256））；
uint256总电源=100*10**18；
对uint256使用SafeMath；
构造函数（）公共{
余额[消息发送方]=总供应量；
}
函数totalSupply（）公共覆盖视图返回（uint256）{
返回总供给；
}
函数平衡（地址令牌所有者）公共覆盖视图返回（uint256）{
返回余额[令牌所有者]；
}
函数传输（地址接收器，uint256 numTokens）公共覆盖返回（bool）{
require（numTokens根据BscScan上的事务详细信息，您尝试发送0.1个BNB，而不调用任何函数

您的合同既不具备接受传入BNB的功能，也不具备接受传入BNB的功能

因此，您需要做的就是实现
receive（）
函数

contract ERC20Basic is IERC20 {
    // rest of your code

    receive() external payable {
        // can call the buy() function
        buy();
    }
}

您可以在中看到，当您向合同发送100 wei（如果是BNB，则为100 jager）时，
receive（）
函数执行
buy（）
函数并生成
buy
事件日志

以下是在合同中实现的全部代码：

pragma solidity ^0.8.0;

interface IERC20 {

function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function allowance(address owner, address spender) external view returns (uint256);

function transfer(address recipient, uint256 amount) external returns (bool);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);


event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
    
}


contract ERC20Basic is IERC20 {

string public constant name = "ByeSeel";
string public constant symbol = "BYS";
uint8 public constant decimals = 18;


//event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
//event Transfer(address indexed from, address indexed to, uint tokens);


mapping(address => uint256) balances;

mapping(address => mapping (address => uint256)) allowed;

uint256 totalSupply_ = 100 * 10 ** 18;

using SafeMath for uint256;

constructor() public {
balances[msg.sender] = totalSupply_;
}

function totalSupply() public override view returns (uint256) {
return totalSupply_;
}

function balanceOf(address tokenOwner) public override view returns (uint256) {
    return balances[tokenOwner];
}

function transfer(address receiver, uint256 numTokens) public override returns (bool) {
    require(numTokens <= balances[msg.sender]);
    balances[msg.sender] = balances[msg.sender].sub(numTokens);
    balances[receiver] = balances[receiver].add(numTokens);
    emit Transfer(msg.sender, receiver, numTokens);
    return true;
}

function approve(address delegate, uint256 numTokens) public override returns (bool) {
    allowed[msg.sender][delegate] = numTokens;
    emit Approval(msg.sender, delegate, numTokens);
    return true;
}

function allowance(address owner, address delegate) public override view returns (uint) {
    return allowed[owner][delegate];
}

function transferFrom(address owner, address buyer, uint256 numTokens) public override returns (bool) {
    require(numTokens <= balances[owner]);
    require(numTokens <= allowed[owner][msg.sender]);

    balances[owner] = balances[owner].sub(numTokens);
    allowed[owner][msg.sender] = allowed[owner][msg.sender].sub(numTokens);
    balances[buyer] = balances[buyer].add(numTokens);
    emit Transfer(owner, buyer, numTokens);
    return true;
}

event Received(address, uint);
 receive() external payable {
 emit Received(msg.sender, msg.value);
}

 }

library SafeMath {
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
  assert(b <= a);
  return a - b;
}

function add(uint256 a, uint256 b) internal pure returns (uint256) {
  uint256 c = a + b;
  assert(c >= a);
  return c;
} }

contract DEX {

    event Bought(uint256 amount);
    event Sold(uint256 amount);
    
    
    IERC20 public token;
    
    constructor() public {
        token = new ERC20Basic();
    }
    
    function buy() payable public {
        uint256 amountTobuy = msg.value;
        uint256 dexBalance = token.balanceOf(address(this));
        require(amountTobuy > 0, "You need to send some Ether");
        require(amountTobuy <= dexBalance, "Not enough tokens in the reserve");
        token.transfer(msg.sender, amountTobuy);
        emit Bought(amountTobuy);
    }
    
    function sell(uint256 amount) public {
        require(amount > 0, "You need to sell at least some tokens");
        uint256 allowance = token.allowance(msg.sender, address(this));
        require(allowance >= amount, "Check the token allowance");
        token.transferFrom(msg.sender, address(this), amount);
        payable(msg.sender).transfer(amount);
        emit Sold(amount);
    }
    
    receive() external payable {
        buy();
    }

}

pragma-solidity^0.8.0；
接口IERC20{
函数totalSupply（）外部视图返回（uint256）；
（地址账户）外部视图返回的功能余额（uint256）；
功能允许（地址所有者、地址使用者）外部视图返回（uint256）；
功能转移（地址接收人，uint256金额）外部返回（bool）；
职能部门批准（地址支出人，uint256金额）外部退货（bool）；
函数transferFrom（地址发送方、地址接收方、uint256金额）外部返回（bool）；
事件传输（地址索引自，地址索引至，uint256值）；
事件批准（地址索引所有者、地址索引支出者、uint256值）；
}
合同ERC20Basic为IERC20{
字符串public常量name=“ByeSeel”；
字符串公共常量symbol=“BYS”；
uint8公共常量小数=18；
//事件批准（地址索引令牌所有者、地址索引支出者、uint令牌）；
//事件传输（地址索引自、地址索引至、uint令牌）；
映射（地址=>uint256）余额；
允许映射（地址=>mapping（地址=>uint256））；
uint256总电源=100*10**18；
对uint256使用SafeMath；
构造函数（）公共{
余额[消息发送方]=总供应量；
}
函数totalSupply（）公共覆盖视图返回（uint256）{
返回总供给；
}
函数平衡（地址令牌所有者）公共覆盖视图返回（uint256）{
返回余额[令牌所有者]；
}
函数传输（地址接收器，uint256 numTokens）公共覆盖返回（bool）{
require（numTokens）当您将BNB发送到合同时，我的答案中的代码片段会对您最初提出的错误问题作出反应。它允许您将BNB发送到合同，因此您（或任何用户）可以稍后调用
sell（）
函数，合同现在有BNB发送回用户。它不会返回任何代币…如果你想购买代币，你需要直接调用
buy（）
函数，或者从
receive（）
函数中调用。@EvertonFigueiredo我更新了我的答案，并给出了调用
buy（）的示例
receive（）
函数中的
函数……您能指定“不工作”是什么意思吗？我能够在Remix中成功地发送ETH（对于BNB应该是相同的），并且没有遇到任何问题：1）在
ERC20Basic
（它们已在
IERC20
中定义）并部署
DEX
。2）部署DEX将
100*10**18
令牌发送到我的部署者地址。3）然后我从同一（部署者）向合同发送了100 wei地址并收到100个令牌。@EvertonFigueiredo我用代码更新了答案。使用Solidity 0.8.1I编译后，我将buy（）放在receive（）上从ERC20Basic内部。这一定是错误。这是有道理的。用户在发送事务时与
DEX
合同交互-而不是与
ERC20Basic
交互。因此
DEX
合同需要实现
recieve（）
功能。很高兴它现在可以工作了。
pragma solidity ^0.8.0;

interface IERC20 {

function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function allowance(address owner, address spender) external view returns (uint256);

function transfer(address recipient, uint256 amount) external returns (bool);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);


event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
    
}


contract ERC20Basic is IERC20 {

string public constant name = "ByeSeel";
string public constant symbol = "BYS";
uint8 public constant decimals = 18;


//event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
//event Transfer(address indexed from, address indexed to, uint tokens);


mapping(address => uint256) balances;

mapping(address => mapping (address => uint256)) allowed;

uint256 totalSupply_ = 100 * 10 ** 18;

using SafeMath for uint256;

constructor() public {
balances[msg.sender] = totalSupply_;
}

function totalSupply() public override view returns (uint256) {
return totalSupply_;
}

function balanceOf(address tokenOwner) public override view returns (uint256) {
    return balances[tokenOwner];
}

function transfer(address receiver, uint256 numTokens) public override returns (bool) {
    require(numTokens <= balances[msg.sender]);
    balances[msg.sender] = balances[msg.sender].sub(numTokens);
    balances[receiver] = balances[receiver].add(numTokens);
    emit Transfer(msg.sender, receiver, numTokens);
    return true;
}

function approve(address delegate, uint256 numTokens) public override returns (bool) {
    allowed[msg.sender][delegate] = numTokens;
    emit Approval(msg.sender, delegate, numTokens);
    return true;
}

function allowance(address owner, address delegate) public override view returns (uint) {
    return allowed[owner][delegate];
}

function transferFrom(address owner, address buyer, uint256 numTokens) public override returns (bool) {
    require(numTokens <= balances[owner]);
    require(numTokens <= allowed[owner][msg.sender]);

    balances[owner] = balances[owner].sub(numTokens);
    allowed[owner][msg.sender] = allowed[owner][msg.sender].sub(numTokens);
    balances[buyer] = balances[buyer].add(numTokens);
    emit Transfer(owner, buyer, numTokens);
    return true;
}

event Received(address, uint);
 receive() external payable {
 emit Received(msg.sender, msg.value);
}

 }

library SafeMath {
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
  assert(b <= a);
  return a - b;
}

function add(uint256 a, uint256 b) internal pure returns (uint256) {
  uint256 c = a + b;
  assert(c >= a);
  return c;
} }

contract DEX {

    event Bought(uint256 amount);
    event Sold(uint256 amount);
    
    
    IERC20 public token;
    
    constructor() public {
        token = new ERC20Basic();
    }
    
    function buy() payable public {
        uint256 amountTobuy = msg.value;
        uint256 dexBalance = token.balanceOf(address(this));
        require(amountTobuy > 0, "You need to send some Ether");
        require(amountTobuy <= dexBalance, "Not enough tokens in the reserve");
        token.transfer(msg.sender, amountTobuy);
        emit Bought(amountTobuy);
    }
    
    function sell(uint256 amount) public {
        require(amount > 0, "You need to sell at least some tokens");
        uint256 allowance = token.allowance(msg.sender, address(this));
        require(allowance >= amount, "Check the token allowance");
        token.transferFrom(msg.sender, address(this), amount);
        payable(msg.sender).transfer(amount);
        emit Sold(amount);
    }
    
    receive() external payable {
        buy();
    }

}