Getting a variable from a deployed contract

[Atomzwieback]

Hey,

i nearly googled for an hour but i didnt found a way to get a public variable value of a existing deployed contract.
Is some one able to give me a small hint?

I created a contract object with address and abi and tried then to call a getter or smt but id didnt worked.

[zemse]

Can you share what error do you get?

[Atomzwieback]

Error: unknown account #0 (operation="getAddress", code=UNSUPPORTED_OPERATION, version=providers/5.1.2)

Im not sure if i have to provide the contract the provider signer or a wallet.
I want to get the uniswapV2Pair adress from the contract.

[zemse]

Are you using metamask? If that's the case, maybe there are no accounts enabled for your site. Can you try doing window.ethereum.enable()? It should bring a metamask popup and ask you to "connect" an account to the site. After that subsequent queries should not result into this error.

[Atomzwieback]

nope using quicknode for bsc but i found out a way.

[Atomzwieback]

Done found the solution myself.

[sentiasa]

Can you please post the answer? I am stuck with the similar thing.

[algj]

@sentiasa have you found the solution?

[ricmoo]

@sentiasa @algi Can you please post code or examples of what you are trying to do? I don't fully understand what the OP was attempting to do, so not sure how to help without more context. :)

[algj]

I figured out! Left quick explanation.

[algj]

Solidity example:

uint256 public startBlock;
uint256 public lastRewardBlock;
IBEP20 public rewardToken;

then abi should look like this:

let abi = [
"function startBlock() view returns (uint256)",
"function lastRewardBlock() view returns (uint256)",
"function rewardToken() view returns (IBEP20)"
]

Solidity variables are basically async functions (without any arguments)

[ricmoo]

Depending on what IBEP20 is you likely need to use something else as the return type (e.g. if it is another contract, you need address, if it is a struct, you need the struct tuple definition).