Hi!

I have a contract which receives wei, I wanna send there some tokens to keep by the contract. how to manage receiving token in contract? for currency there is receive() payble method, what about ERC20? I can call token.transferFrom() and transfer token from sender to the contract, and manage it, but what if some just send a token from their metamask wallet?? cant understand the idea =((

Guys, can someone explain the idea of receiving ERC20 token by a contract?

contract receives the token, and transfer it to another EOA?

Create a test event and emit it anch chrck what is haopening

I dont use remix.

This was for @elijah147

Ah I see

I can't understand idea when I send any token to the my contract, how should I handle this by contact?

But u can deploy it in ganache and test it

You should use other standars for that, example erc223 if I remember correctly

Or erc 777

need to put the final address of the transfer in arguments, record it, then make an automatic or on request transfer

the challenge would be to get multiple transfer from the same address to different ones

I believe the error happens on this function but i'm not 100 sure where it is failing I suspect is line 67

wooh go ant try to implement )

If I do it provides me an error

let me see if I can mimic it

@El_invader why u have those values there??

It was part of the call but it enforce me to remoce () and add ; at the end

But u are not adding nothin

idk i was sleepy as hell tbh

what would be the proper way to add it without causing exclusive error?

@El_invader
That code is soooooo messy

Using a +

true I fuckedup

Im going to be a bit hard. But if you need help to see whats wrong with that code you need to go back to programming basics

And why dont you use requires and put a revert reason???

Can you give me an example?

Like this?

Function name() public returns (bool success) {
require(name);
}

Yo dont know how a require works???
https://ethereum.stackexchange.com/questions/24969/solidity-how-can-we-write-a-error-message-in-require

Btw thanks yes I have an idea of how “require” works

I have been trying to find a contract using at least 0.8.12 but the closest one thats safe was BTT

One more question) Ok, I send some tokens from an address to my contract. Now when I look at token balance of my contract I see it. (token.balanceOf(address(this)))
But can contract track who send the tokens and track balance of received token by sender? aka erc20 wallet?

p.s. I know that I can write a custom func which transfer token from and address to contract and the manage it. but can contract track it somehow else?

Yes you could write your contract to have a function through which people could transfer tokens, and it tracks the senders. If people do plain transfers to the contract it can't track those senders since no contract code gets run

so, if contract receive plain transfer it's developer deal to handle this "common balance" somehow?

Yeah basically

huh. Thanks a tons man! It costs me a day to comprehend tokens behavior ... ))

No prob. Yeah a typical setup in this case is to have an ownerOnly function that can "rescue" these improperly sent tokens, sending them back to the address that sent them

Of course you need to go look up the transfers to get the sender addresses

Also useful for people that accidentally send other unrelated tokens to the contract

I typically write ERC20 and ERC721 "rescue" functions into my NFT contracts for this purpose

as I assume the contract owner have to provide sender address to the 'rescue' func, because contract dont know it. right?

Right

👍👍👍