solidity | Generic solidity smart-contracts | Blockchain library
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Generic solidity smart-contracts
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QUESTION
Can someone help me investigate why my Chainlink requests aren't getting fulfilled. They get fulfilled in my tests (see hardhat test etherscan events(https://kovan.etherscan.io/address/0x8Ae71A5a6c73dc87e0B9Da426c1b3B145a6F0d12#events). But they don't get fulfilled when I make them from my react app (see react app contract's etherscan events https://kovan.etherscan.io/address/0x6da2256a13fd36a884eb14185e756e89ffa695f8#events).
Same contracts (different addresses), same function call.
Updates:
Here's the code I use to call them in my tests
...ANSWER
Answered 2021-Jun-16 at 00:09Remove your agreement vars in MinimalClone.sol, and either have the user input them as args in your init() method or hardcode them into the request like this:
QUESTION
I write a simple contract to test the event like the following code:
...ANSWER
Answered 2021-Jun-14 at 16:18It's stored on the blockchain in the form of keccak256 hash of the event signature.
QUESTION
I have this code I have entered into Remix IDE, as ReceivedEther.sol, a standalone smart contract.
I've transferred 0.02 Ether to the smart contract, using MetaMask.
When I checked the smart contract's balance, it returns 200000000000000000, as expected.
If I try to use the transferEther function, however, and enter a number smaller than this - say, 0.005 ETH, or 50000000000000000 as the amount - it doesn't work using MetaMask.
When MetaMask prompts me it's never for that amount. It's for 0 ETH and 0.00322 gas fee (or whatever the gas is). Basically it always set the amount of ETH at 0 and only charges the fee.
Why can't I transfer an amount of ETH using this function in the Remix IDE with MetaMask?
...ANSWER
Answered 2021-Jun-13 at 21:44Your code sends ETH (stated in the _amount variable) from the smart contract to the _recipient. So it doesn't require any ETH to be sent in order to execute the transferEther() function.
If you want your contract to accept ETH, the function that accepts it (or the general fallback() or receive() function) needs to be marked as payable.
Example:
QUESTION
So I'm trying to learn to build NF token, and I cloned a repo. It's supposed to work with truffle. The thing is I have an error with the compiler, and I don't really understand. Indeed what I know is that the solidity compiler have problems with different versions, hence working with truffle CLI that works better with different versions projects.
So I tried to change to "pragma solidity >0.5.8 <0.6.0;", I did sudo truffle compile, and still have the error.
The error message I got is:
my typo `Source file requires different compiler version (current compiler is 0.7.4+commit.3f05b770.Emscripten.clang) - note that nightly builds are considered to be strictly less than the released version
I know that I need to find a good version of solidity and truffle, but I believe that my versions are okay :
Truffle v5.0.5 (core: 5.0.5) Solidity v0.5.0 (solc-js) Node v14.16.0
ANSWER
Answered 2021-Mar-16 at 11:01Change the compiler version in the truffle-config.js file to match the one your are using in your smart contract
QUESTION
Free TON Solidity. How to get hash from data encoded into cell? tvm.hash() analogue?
...ANSWER
Answered 2021-Jun-08 at 08:29Do You need hash of BOC? Check this function https://github.com/tonlabs/TON-SDK/blob/master/docs/mod_boc.md#get_boc_hash
BOC with one CELL equal to CELL itself.
In fact BOC starts from root CELL which point to other CELLs.
QUESTION
The Tron Network uses Solidity and has a lot of similarities to Ethereum.
I'm trying to use the OpenZeppelin contracts designed for Ethereum to run on the Tron Network.
I've chosen Solidity version 0.6.x which is supported by the tronbox compiler.
Is it possible to run OpenZeppelin contracts on the Tron Network?
...ANSWER
Answered 2021-Jun-07 at 13:33Is it possible to run OpenZeppelin contracts on the Tron Network?
Yes. For example this token uses an OpenZeppelin implementation of ERC20.
QUESTION
Free TON Solidity code or execution error. Can't understand my mistake, I already compact the code to the minimum:
cat ./SimpleStorage.sol
...ANSWER
Answered 2021-Jun-06 at 15:59You need to enable gas before You store variables. tvm.accept can do it.
QUESTION
when I try to run my contracts by using:
truffle migrate --network infura
I get thrown an error saying all my files require a higher pragma solidity version, in the error it says I'm currently using solc 0.5.16 yet I've ran
npm uninstall
and then
install
and when I run
NPM list or solcjs --version
it shows solc@0.8.4, could anyone help me identify the issue thanks.
...ANSWER
Answered 2021-Jun-05 at 15:36For some reason visual code choose a different solc compiler than the one i installed so when you run a solidity you have to use
solcjs --bin --base-path . ./file name
and that will use the solc that you installed using
npm install -g solc
Worked for me, hope it works for all of you
QUESTION
I would like to compute the sha256 of a string in a Free TON-Solidity contract, I do it by storing the string in a TvmBuilder and then passing it as a TvmSlice to sha256(), but the result is not correct (it doesn't match the one computed by sha256sum in my shell). Any idea why ?
Is the TvmBuilder adding some bits that are passed in the slice ?
...ANSWER
Answered 2021-Jun-04 at 08:47Yes, tvm builder is kind of TL-B scheme serializer as far as I understand
sha256() function in Free TON Solidity API only takes a TvmBuilder as input, You can compute the hash for a raw string.
Hashing arbitrary string is hashing its BOC , because BOC is the only structure tvm can understand
i think you may want to build BOC out of this string. builder builds cells and cell layout is made of slices + refs. it results in a tree structure of slices mixed with refs, which resolve in blockchain state.
your approach should work for small strings as well as it works with the whole blockchain state. that’s the only way tvm understands data
so hash of string is hash of a cell which has proofs for underlying cells
that’s the way i now understand it, hope that helps.
and if you have string less than 127 bytes, you can pass bytes instead and hash bytes packed in a single cell
tg @freeton_smartcontracts here where clever SmC guys can clarify , because i’m self learner, not really hands on SmC pro
maybe this or rust core sdk help you
QUESTION
function App(){
const [PopulateStudent] = useState(0);
const handleGet = asnyc (e) => {
e.preventDefault();
const result = await Certificate.methids.PopulateStudent("parameter1", "parameter2", "parameter3", "parameter4").call();
console.log(result)
}
return(
Fill
);
}
export default App;
ANSWER
Answered 2021-Jun-03 at 18:47There are two main types of operations when you're interacting with smart contracts. A (read-write) transaction and a (read-only) call.
The PopulateStudent() solidity function requires a transaction, because it modifies the contract state (saves the newly created Student struct to the contract storage).
If the students property (to which the PopulateStudent() stores) is public, you can call its autogenerated getter function (autogenerated - it doesn't need to be in your contract). For example:
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