如何用我自己的ERC20代币铸造ERC1155

Question

我正试图用我自己的ERC20铸造我的ERC1155 nft，所以我做了以下操作：

1-创建了ERC20的变量

ERC20 public FCG = FCG<br> 

并且在构造函数中，我传递ERC20代币合约的地址

FCG = ERC20(0x0fC5025C764cE34df352757e82f7B5c4Df39A836);

2-在我的薄荷功能中，我执行了以下代码

function mintCharacterPublic(address to, uint256 id, uint256 amount) public payable returns(bool){
require(to != address(0), "ERC1155: mint to the zero address");
require(FCG.approve(address(this), MINT_PRICE), "can't approve your token");
require(uint256(FCG.allowance(msg.sender, address(this))) >= MINT_PRICE, "Not enough of  tokens");
FCG.transferFrom(msg.sender, address(this), MINT_PRICE);
mintCharacter(to, id, amount);
_balances[id][to] +=amount;
return true;
}

但当我尝试铸造时，它不适用，它会抛出"；代币不够"；所以我认为approve函数不能正确运行。

这是我的代币智能合约

// SPDX-License-Identifier: MIT
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
pragma solidity ^0.8.2;
contract Token {
mapping(address => uint) public balances;
mapping(address => mapping(address => uint))  public allowance;
uint  public totalSupply = 1000000 * 10 ** 18;
string public name = "FightClub Token";
string public symbol = "FCT";
uint public decimals = 18;

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

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

function balanceOf(address owner) public  view returns(uint) {
return balances[owner];
}

function transfer(address to, uint value) public  returns(bool) {
require(balanceOf(msg.sender) >= value, 'balance too low');
balances[to] += value;
balances[msg.sender] -= value;
emit Transfer(msg.sender, to, value);
return true;
}

function transferFrom(address from, address to, uint value) public  returns(bool) {
require(balanceOf(from) >= value, 'balance too low');
require(allowance[from][msg.sender] >= value, 'allowance too low');
balances[to] += value;
balances[from] -= value;
emit Transfer(from, to, value);
return true;   
}

function approve(address spender, uint value) public returns (bool) {
allowance[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;   
}
}

Answer 1

这必须是一个分两步的过程：

1. 用户authorize是您花费代币的合同
2. 用户调用mintCharacterPublic

您的合同不能授予自己使用发起人代币的权限。require(FCG.approve(address(this), MINT_PRICE), "can't approve your token");意味着eip-721合同将其自己的批准设置为MINT_PRICE，而不是最终用户的。