Blockchain By Example

Ending the sale

The only remaining part of our contract is the functionality to end the sale. We previously stated that our sale will be a fixed-price, fixed-period sale. In this sale, the owner will be able to end the sale at any time. In the real world, this would not be ideal, and would be a red flag to any potential investors. The code is defined as follows:

function endSale() public {   require(msg.sender == owner);   require(tokenContract.transfer(owner,                                  tokenContract.balanceOf(this)));   msg.sender.transfer(address(this).balance);}

The endSale() function first transfers all remaining tokens from the address of our ERC-20 contract to the address of the contract owner. It then transfers the ether held by the sale contract to the same address. ...