事务失败错误

Question

当我加上下面的一行时-

require(msg.value > 0.1 ether);

我得到了以下错误-

Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending?
execution reverted

它的原因是什么，我如何解决？

这是我最聪明的合同-

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.0 <0.9.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC1155/ERC1155.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Strings.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Counters.sol";


contract Tokens is ERC1155 {

using Counters for Counters.Counter;
Counters.Counter private _tokenIds;

constructor() ERC1155("https://ipfs.io/ipfs/bafybeic3yphboh7wtzr6rr4zz/NFT{id}") {
}

function uri(uint256 tokenId) override public pure returns (string memory) {

    return(
        string(abi.encodePacked(
            "https://ipfs.io/ipfs/bafybeic3yphboh7wtzr6rr4zz/NFT",
            Strings.toString(tokenId),
            ".jpg"
        ))
    );
}

function mintNFT(uint256 amount) public returns (uint256)
{
    _tokenIds.increment();
    uint256 newItemId = _tokenIds.current();
    _mint(msg.sender, newItemId, amount, "");
    return newItemId;
}

function purchaseNFT(address from, uint id, uint amount) public payable {
    require(ERC1155.balanceOf(from, id) >= amount);
    require(msg.value > 1 ether);
    ERC1155.safeTransferFrom(from, msg.sender, id, amount, "");
}

function approve(address to) public
{
    ERC1155.setApprovalForAll(to, true);
}

}

Answer 1

你的智能合同代码起作用了。添加此条件时可能会出现问题：

require(msg.value > 0.1 ether);

是在REMIX中，您不会在部署和运行值文本框下面的msg.value文本框中设置值。总之，当您调用purchaseNft()时，必须在值文本框内设置值(参见此图像)。我对您的功能进行了改进，特别是您可以看到以下代码：

function purchaseNFT(address to, uint id, uint amount) public payable {
        address from = msg.sender;
        require(ERC1155.balanceOf(from, id) >= amount, "Error on balanceOf() line!");
        require(msg.value > 0.1 ether, "Error on check msg.value line!");
        ERC1155.safeTransferFrom(from, to, id, amount, "");
    }

我将msg.sender设置为from变量，因为当您编写ERC1155时，安全传输来自(from，msg.sender，id，and，"")；在智能契约代码中，关于msg.sender的值是您的智能契约地址，而不是用户钱包地址。