如何创建智能合约来转发 ERC20？

Question

I try to to create a contract that receive ERC20 token, then forward to destination address with below code, but it seems like it is not working correctly.

receive() external payable
    {
        emit Deposit(msg.sender, msg.value);
        ERC20 token = ERC20(TOKEN_ADDRESS);
        token.transfer(DESTINATION_ADDRESS,token.balanceOf(address(this));
    }

• Is there anyway to create contract like this with smartcontract?
• How I can change above code to make it work?

Thanks!

Answer 1

Is there anyway to create contract like this with smartcontract?

Yes.

How I can change above code to make it work?

You need to use approve() and transferFrom() of ERC-20 token standard to process token payments in smart contracts. payable keyword only concerns ETH payments, not token payments.

For more information how approve() mechanism work can be for example found here , though multiple tutorials exist on this topic.

Answer 2

Ok, I got it. The point that this receive() function is not trigger when sending token to the contract, so this code is not working at all.

And in my case, I think I have to create a contract to let the owner call and use ERC20 transfer function to transfer the token, because he is the token owner already, then he do not need to call approve and transferFrom function.