Questions tagged [solidity]
Solidity is a contract-oriented, high-level language whose syntax is similar to that of JavaScript and it is designed for writing smart contracts in Ethereum to run on the EVM. Solidity is statically typed, supports inheritance, libraries and complex user-defined types among other features.
17,417
questions
0
votes
1
answer
30
views
Gas griefing in "typed" external calls
I was wondering whether the "insufficient gas griefing attack" is possible in cases when the external call is a typed call rather than an inline call with lower level utility functions (i.e. ...
- 264
1
vote
0
answers
74
views
Could not decode result data
I have an issue when trying deploy contract
// SPDX-License-Identifier: ISC
pragma solidity ^0.8.19;
contract SimpleStorage {
uint256 favoriteNumber;
struct People {
uint256 favoriteNumber;
...
- 13
1
vote
0
answers
14
views
What does this function actually do in ERC1820?
I am unable to understand these two functions from the ERC1820 contract and its use. What does it actually do under the hood?
Function 1 :
/// @notice Checks whether the hash is a ERC165 interface (...
- 53
0
votes
0
answers
14
views
How to add 5% buy and 5% sell fees to live-token?
I want to add 5% Sell and 5% Buy Fees to a token contract on Remix
The Token is already live, so i just want to update it from 0% to 5%.
But the numbers are all in uint256, what is the correct number ...
0
votes
0
answers
18
views
how to access to a public mapping from test script
i'm in hardhat
i'v this public mapping
mapping (address user => uint[] commentIds) public userComments;
and i'm trying to call it inside my test Script
console.log(`user1 comments: ${...
- 11
0
votes
0
answers
12
views
Can I delete the Values in the mappings using delete keyword [duplicate]
mapping(IERC => contract) public testing;
delete testing[IERC];
In the above code snippet I want to delete contract type (value) using the delete keyword can it be possible?
- 41
1
vote
2
answers
42
views
Read Solidity struct with Web3.py
I can use Python to read from contracts using functions like:
tx = mySolidityContract.functions.x().call()
to read a variable x on mySolidityContract
Say I have a struct in my solidity contract, like
...
- 701
1
vote
0
answers
28
views
How to record GPS points without exceeding int256?
I want to record GPS points in my smart contract, and what I'm currently doing is removing the decimal. The problem is that some values exceed int256. How can I resolve this?
- 11
0
votes
1
answer
32
views
Error deploying contracts: Error: incorrect number of arguments to constructor at ContractFactory.getDeployTransaction
const hre = require("hardhat");
// async function main(){
// const RPSLS = await hre.ethers.getContractFactory("RPSLS");
// const RPSLSF = await RPSLS.deploy();
// await ...
- 9
1
vote
0
answers
89
views
cannot use array as type ptr as argument
I am using Go-Ethereum and I have the following error:
abi: cannot use array as type ptr as argument
But it does not make any since I don't pass an array.
The arguments to routerABI.Pack function ...
- 125
0
votes
1
answer
23
views
Incorrect Decimals & Max Total Supply ERC20 Token
After deploying token contract on ethereum I am getting 0 decimals being shown on etherscan whilst other explorers displaying correctly.
I presume because of this Max Total Supply displays as:-
3,200,...
- 101
1
vote
0
answers
13
views
Will block.coinbase.call{value: _ethAmountToCoinbase}(new bytes(0)) revert if transaction fails?
A similar looking statement address.call(abi.encodeWithSignature()) will not revert if transaction fails because it is an external call.
So, will block.coinbase.call{value: _ethAmountToCoinbase}(new ...
- 233
0
votes
1
answer
33
views
Trying to send Matic from one wallet to another on Mumbai but it is not sent
Below is my solidity code. I am trying to send MATIC to the "receiverAddress". Everything looks fine. I have 2.3875 MATIC in my wallet and I'm inserting 87500000000000000 as sending MATIC ...
0
votes
1
answer
61
views
Token with whitelist function, that would only whitelisted addresses to trade the token while trading is disabled
I want to create a token and add liquidity but only whitelisted addresses would able to trade the token while trading is disabled. If trading is enabled that means everyone can trade it but if it is ...
- 133
0
votes
1
answer
24
views
transferFrom fails even though allowance granted?
Please see attached Tenderly stack trace:
https://dashboard.tenderly.co/shared/simulation/86e27f67-6f7e-4122-83da-d43f455fb57a
I'm not sure why transferfrom is failing even through I have granted ...
0
votes
0
answers
14
views
Issues in the ERC20 token Contract burn
I was just going through this contract and that the _balances[account] is being deducted before the require statement. Is this still correct?
also there was no else and seemed like it will be ...
0
votes
1
answer
26
views
Trying to send matic to a wallet but Can't stake MATIC
basically what I am trying to do is create a contract that different wallets can send MATIC to one single wallet and after some time withdraw with some reward as MATIC.
ie. Stake 100 matic, then ...
0
votes
1
answer
7
views
How to get the array index by a perticular condition
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
contract final_year_project {
struct hospital_record {
address patient;
string hospital;
string docter;
...
1
vote
1
answer
31
views
Weak RNG vulnerability proving
Hi guys I am auditing a smart contract and I found a WeakRNG
in order to prove it I have written 2 smart contracts which simulate the work of this function( a bit )
here is the 1 a have changed block....
- 11
0
votes
1
answer
41
views
Solidity: How to decode / trace / search custom error byte code
I ran into this Custom Error during my Foundry test:
[FAIL. Reason: Custom Error cd786059:(0xF628...)]
and I had no idea about what it means...
then I figured out where it went wrong after tracing ...
- 1,764
0
votes
1
answer
35
views
Approve function called by an address in a smartcontract different from the token contract
I would like to know if an address can give approval to spend his tokens to another address or contract by calling the function approve in the same contract (not the token contract but another).
Thank ...
0
votes
1
answer
22
views
Rejecting the transaction doesn't catch the error in try-catch block
I am working on a Dapp porject ,Where I have to catch the metamask error.
Here is my code:
import React, {
createContext,
useContext,
useEffect,
useRef,
useState,
} from "react";
...
0
votes
1
answer
42
views
Is Making an NFT on Binance Smart Chain on Remix currently possible? (compiler versions problem)
I'm trying to make a basic imageless NFT for Binance Smart Chain using remix.ethereum.org (for NFT identity verification purposes) but I've encountered a problem. Basically solidity version 0.8.2 or ...
- 137
1
vote
1
answer
19
views
How can I access the 3rd argument of _safeMint?
I am minting an ERC721 using _safeMint and I am setting the 3rd argument to a string. I want to be able to access this data argument using the transaction hash or whatever I have to access the ...
- 683
1
vote
2
answers
30
views
Is it possible to validate a UUID in Solidity?
How can I check that a uuid is valid in Solidity? Is there a library or anything to do that?
- 683
0
votes
1
answer
35
views
How to download and install Echidna?
I have just started learning echidna but i havent found any detailed information of how to install and setup echidna in WSL.
- 41
1
vote
1
answer
26
views
".send()" web3.js in the browser for a deployed contract, it doesn't work correctly
I am not a native English speaker, so my English is not very good. I apologize if my sentences are not correct.
I have deployed the following contract.
pragma solidity >=0.4.22 <0.9.0;
pragma ...
- 11
0
votes
1
answer
25
views
Psuedorandom generator sourced from onchain entropy
I'm writing a fun game as a solidity contract and looking to generate somewhat random (or unpredictable numbers). I have researched this topic and am aware using an off chain oracle is the best ...
user66516
0
votes
0
answers
3
views
transact to VRFD20.rollDice pending
Guys whichever function i'm calling after deployment , its saying transact to be pending... what is the reason behind this , i'm not getting it
- 3
0
votes
1
answer
20
views
How to identify from where exactly the transaction got reverted while deploying and running the code in remix?
After testing a smart contract with several test cases, in some cases it reverts back and says
errored: Error occured: revert.
revert
The transaction has been reverted to the initial state.
Note: The ...
- 25
0
votes
1
answer
23
views
If a function takes deposit of tokens and then calls another function in the same transaction, is the latter function "aware" of the token deposit?
I'm pretty new to solidity and I'm looking at this contract, specifically the deposit and _mintShares functions. deposit accepts a deposit of tokens and then calls _mintShares during its execution. Is ...
- 41
0
votes
1
answer
21
views
whitelist contract's address showing undefined without showing any error message
I am following this tutorial here to learn developing whitelist contract. My node verion is 18.12.1 and testnet is sepolia. I am currently on windows11 OS.
whitelist.sol:
//SPDX-License-Identifier: ...
1
vote
1
answer
23
views
Call or assignment expected. Getting this error while upgrading solidity version
I am not aware of the Assembly code. I copied the ERC1820 registry contract from here. This is written in 0.5.3. When I tried to compile it with 0.8.0 it gave me this error :
I know it's because of ...
- 53
0
votes
0
answers
13
views
Need help with debugging Error: Definition of base has to precede definition of derived contract
I'm working on a social account recovery feature for smart accounts (ERC-4337) on top of Thirdweb's smart account contract.
Link to the codebase
I'm getting the error Base has to precede definition of ...
0
votes
1
answer
31
views
Vscode , wrong error messages
if some one could help me how to disable wrong warning errors in vscode ?
- 11
1
vote
1
answer
76
views
I need help from Expert Dev for POS bot [duplicate]
I recently received a code and deployed it. it sent 0.2 eth which is succesful and is visible in the contract transaction. I hoped to generate some passive income with with this POS Bot. The problem ...
- 11
2
votes
1
answer
74
views
How to assign and send ether value together with deployment of contract using Foundry
This is the simple function, how do I deploy the contract and send ether along with it?
function setUp() public {
test = new testContract(
Owner;
);
}
- 65
0
votes
0
answers
11
views
How to have solidity output as minimal assembler-close bytecode as possible?
While as indicated in this answer it is probably impossible to have Solidity optimize away the free memory pointer and it's initialization causing the bytecode to start with 0x6080, I was wondering if ...
- 113
0
votes
1
answer
24
views
Solidity variable for contract scope (not state variables)?
I use state variables for the interaction of calls (fallback) between contracts. But copying and clearing state variables uses a lot of gas.
Perhaps there is a better practice, how to have temporary ...
- 1
0
votes
1
answer
42
views
Solidity Event String parameter decoding
The value of aggregatorId in the event emitted by the below tx is not equal to value “oneInchV5FeeDynamic” in the tx? Also, I can’t decode the value emitted in the event “...
2
votes
1
answer
20
views
Has Solidity Introduced Storage Optimization for Smaller Integer Types in Structs?
I am working on a project where storage efficiency is of utmost importance. Specifically, I have a scenario where I want to store an ID of type uint16 and a code of type uint8. The current plan is to ...
- 1,418
0
votes
1
answer
34
views
Cant make conection with my Smart Contract using web3
I cant get my contract instance using web3 . I am making todo app using web3 . I cant get my contract instance in js file . I am new to web3 development and everyday I am trying my best improve my ...
- 13
2
votes
1
answer
46
views
Transaction data is not a multiple of 32 bytes
My understanding is that in a transaction's input data, the first 4 bytes, i.e. 8 characters, is reserved for a function signature. The rest of the data, after processed by the API, will be fitted to ...
- 41
0
votes
1
answer
51
views
What is wrong with this code that it is not deploying on the testnet binance smart chain and giving me infinite gas error [duplicate]
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.21;
// Import the OpenZeppelin library for security.
import "@openzeppelin/contracts/access/Ownable.sol";
interface IERC20Token {
...
- 21
1
vote
1
answer
38
views
How to customize forge formatter in vscode
I'm using Foundry toolchain and vscode for my smart contracts development.
As suggested by the Foundry documentation I applied the vscode integration tweaks and I'm using forge formatter to format my ...
- 765
0
votes
1
answer
9
views
new release of ERC1155SupplyUpgradeale has compilation issues
The new contracts lib from OZ, specifically ERC1155UspplyUpgradeable
has compilation issues before even inheriting it in any child contract (check screenshot below) any idea why? or how to fix it?
...
- 41
0
votes
0
answers
12
views
How are discrepancies with integer division handled in production contracts?
In my Escrow contract I have an item worth
0.1 ether and 1 wei = 100,000,000,000,000,001 wei.
I need to divide this amount in half, and send it to two people.
100,000,000,000,000,001 / 2
Each person ...
- 113
0
votes
0
answers
30
views
CREATE2 in UniswapV2Factory contract returns zero address on my test network
My function in a contract is responsible for creating a liquidity pair on uniswapV2. Unfortunately, the "CREATE2" opcode in the createPair function of the UniswapV2Factory contract does not ...
- 1
0
votes
0
answers
33
views
Can you tell me, why addLiquidityETH is not working?
Can you tell me, why addLiquidityETH is not working? I'm trying to call her through etherscan.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/...
0
votes
0
answers
21
views
Recover funds from a smart contract wrote a mistake by developers
Our developer has deployed a errored smart contract for a autopool plan, but the plan was expired 3 years ago. Users transfered funds to this contract. I am wondering if I can get back these funds ...
