abicontract-developmenteventsremixsolidity
I want to watch a Solidity contract using the Mist browser. I know how to do that and it needs the address and the json. I have the address, but I don't have the json. I do have the source code.
Can I generate the json from the source code and/or the Ethereum address?
Fill in the JSON Interface field in Mist (Ethereum Wallet) with the contract ABI (Application Binary Interface) that is listed in Ethereum Alarm Clock 1.0.0 documentation - Scheduler ABI and the contract will be loaded.
This works with versions 0.5.1 and 0.6.2, but NOT with 0.7.2.
A bug report has been lodged on github.com - Cannot load Ethereum Alarm Clock Scheduler Contract in 0.7.2 . Working in 0.6.2 . #515 . This bug has been fixed in 0.7.6 (but the Mist freezing issue when The DAO contract is in the contracts watchlist is still a problem).
The security features refers to the checksum on the address. Before the checksum feature was introduced, addresses like 0x6c8f2a135f6ed072de4503bd7c4999a1a17f824b were all lowercase. I entered this address in etherchain.org and copied the equivalent checksummed address which is 0x6C8f2A135f6ed072DE4503Bd7C4999a1a17F824B. Both versions should work in the Ethereum Wallet.
A bug report has been lodged.
A similar screen is also displayed in 0.5.1
You might want to try downloading the old 0.6.2 version of Ethereum Wallet and see if you can load the contract in your screen. The issue you are encountering may be a bug in the new version.
And check that you are using the Main network (menu Develop -> Network).
While submitting the bug report, I when through the recommended steps to check. One of these steps was to load the console (menu Develop -> Toggle Developer Tools -> Wallet UI). The 0.7.2 console showed the message Error: CONNECTION ERROR: Couldn't connect to node on IPC. (...).
I know the question is old, but I had some problems with this so I will share what helped me.
To import the ABI from a JSON file, you can use the following code (assuming you already have your web3 Object):
var fs = require('fs');
var jsonFile = "pathToYourJSONFile/project.json";
var parsed= JSON.parse(fs.readFileSync(jsonFile));
var abi = parsed.abi;
var YourContract= new web3.eth.Contract(abi, 0x12345678912345678912345678912345678912);
You can read more about it here: https://web3js.readthedocs.io/en/1.0/web3-eth-contract.html
Update 01/2020: Since Typescript 2.9, reading JSON Files is supported directly. So if you try to get the ABI or Bytecode from within a Typescript Project (Angular, React, ...) simply go to your tsconfig.json and set:
{
"compilerOptions": {
"resolveJsonModule": true,
"esModuleInterop": true
}
}
You can then use import ContractName from 'path/to/contract/ContractName.json'
to import your Contracts and get the Abi with ContractName.abi.
Cheers
Best Answer
The JSON is called an ABI.
You do need the source code, as you have, and one way to get the ABI is to paste it in Remix IDE, compile it, and then click the 'ABI' button to copy the ABI into your clipboard.