How to Withdraw Ether from a Contract

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I've been playing with Token contracts, so far so good, however once the Ether is sent and the tokens created, what happens to the Ether?

I have some Ether on the contract address, how do I withdraw it?

I guess it's not about the contract code but about the interface, I've been using Ethereum Wallet. The send funds screen only allows to fund the contract, not send from it.

Best Answer

The function would be something like this:

pragma solidity >=0.8.0;

function withdraw() {
    payable(msg.sender).transfer(address(this).balance);
}

Just make sure you only allow yourself to access it

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[Ethereum] How to Retrieve Remaining Tokens from ICO Contract

If your contract(s) are already deployed, you're out of luck.

On the other hand if you are still developing either the token or the crowdsale, there are a number of ways you can move the tokens around.

Firstly, the token balance on your crowd sale contract is just a value allocated within the token contract, so you can just have a function on your token contract allow you to directly reassign the balance from the crowd sale contract.

uint256 unsold = balances[saleaddress];
balances[saleaddress] = 0;
balances[someLocation] += unsold;

A better option perhaps, is to have the crowd sale contract handle it. In this case you can do something like

function withdrawUnsoldTokens()
{
    require(msg.sender == ownerAddress);
    ERC20 mytoken = new ERC20(tokenAddress);
    uint256 unsold = mytoken.balanceOf(this);
    mytoken.transfer(ownerAddress, unsold);
}

[Ethereum] Smart contract that accepts custom token

You must read this

The process is more complicated but it still does its job so I think it's worth it

Best Answer

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[Ethereum] How to Retrieve Remaining Tokens from ICO Contract

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