August 2018
Beginner to intermediate
153 pages
2h 15m
English
Content preview from Build Your First Ethereum DApp
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Chapter 5: Cross-contract Communication & Token Selling
In part 4 of this tutorial series on building DApps with Ethereum, we started building and testing our DAO contract. Now let’s go one step further and handle adding content and tokens to the story, as per our introduction.
Adding Tokens
For a contract to be able to interact with another contract, it needs to be aware of that other contract’s interface — the functions available to it. Since our TNS token has a fairly straightforward interface, we can include it as such in the contract of our DAO, above the contract StoryDao declaration and under our import statements:
contract LockableToken is Ownable { function totalSupply() public view returns (uint256); function balanceOf(address who) ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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