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 3 years ago
source link: https://learnblockchain.cn/question/1695
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我想写一个USDT归集转账的合约，想在这个归集合约里面调用USDT的transferForm接口，可是调用的时候报错了。 | 登链社区 | 技术问答

40 我想写一个USDT归集转账的合约，想在这个归集合约里面调用USDT的transferForm接口，可是调用的时候报错了。

我调用的合约代码如下：

    function collect() public {
        for (uint i; i < userList.length - 1; i++) {
            
            uint256 allowance = handler.allowance(userList[i], gather_address);
            
            handler.transferFrom(userList[i], gather_address, allowance);
        }
    }

错误提示信息如下：

###### Gas estimation failed

**

Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending?
Internal JSON-RPC error. { "code": -32000, "message": "execution reverted" }

调用在归集合约中调用 USDT 合约的 allowance，balanceof 接口都正常。希望能帮忙。谢谢

最佳答案 2020-11-24 19:43

把 hander 接口定义的 transferFrom 的返回值去掉。
这个是因为 USDT 没有完全遵循 ERC20 标准

Tiny熊 - 布道者
擅长：智能合约,以太坊 | 采纳率 47% | 回答于 2020-11-24 19:43

report

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