Metamask: Not able to transfer my ETH from the Smart Contract to an User Account while using Truffle or ReactJS with Web3
- 2025-02
- by Cn Vn
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Metamask issues: Unable to transfer ETH from smart contract to user account using Truffle and ReactJS
I recently ran into a problem trying to transfer Ethereum (ETH) from a smart contract to a user account using Truffle and ReactJS. The problem is how Metamask processes transactions between the smart contract and the user’s wallet.
Problem:
In my Solidity code, I’m asking to use the TransferETH' function provided by Truffle to transfer ETH from an Ethereum address stored in a smart contract store to a user account. However, when trying to perform this transaction using ReactJS, Metamask encounters problems and cannot complete the transfer.
Solution:
To solve this problem, we need to useeth_sendTransactionfunction from Truffle instead of
TransferETH. The latter option has been deprecated in favor of
eth_sendTransaction, which provides more control over the flow of transactions. Here's an updated version of my Solidity code that uses these changes:
eth_sendTransaction
pragma solidity ^0.6.0;
contract MySmartContract {
// Define a mapping to store user account addresses and their corresponding ETH balances.
display(address => uint256) public user balances;
function donateETH(recipient address, uint256 amount) public payment {
require(amount > 0, "Invalid amount");
// Store the donation amount in the contract storage.
userBalances[recipient] = userBalances[recipient].add(amount);
// Send the donated ETH to the recipient address using the
function.
eth_sendTransaction
transferETH(recipient);
}
function transferETH(address recipient) public {
require(userBalances[msg.sender] >= 1 ether, "Insufficient balance");
// Create a transaction object using the Truffle
function.
Transaction memory transaction = Transaction(
message sender,
address(this),
Wei(1),
Wei("0x"),
0
);
// Sign the transaction with our private key, and then broadcast it to the network.
require(tx.signatures[0].from != "", "No signatures");
required(tx.hash, true);
tx.send();
}
}
Using Truffle and ReactJS:
To use this updated contract in your ReactJS application, you need to install the truffle’ library and configure the Truffle provider. Here’s an example of how to create a new project using Truffle:
npm init truffle -y
npx truffle initialization
Create a new file named my_contract.sol
, copy the above Solidity code into it, and then create a new directory structure:
my_contract/
my_contract.sol
public/
Пользователь.sol
contracts/
user/
__heat__.js
Then, in your ReactJS application, you can use the TruffleProvider
component from @truffle/core
to connect to your Truffle provider and interact with your smart contract:
“`jsx
import React, {useEffect} from ‘react’;
import { Supplier } from ‘truffle-provider’;
import Web3 from ‘web3’;
constant Application = () => {
const web3 = new Web3(window.ethereum);
useEffect(() => {
if (window.etherium) {
web3.currentProvider.connect().then((account) => {
// Use account address to transfer ETH to user accounts.
web3.currentProvider.eth.sendTransaction({
from: ‘0x’, // Your contract address
to: ‘0x’, // User’s wallet address
value: 1 ether, // Transfer amount
gasPrice: web3.utils.toWei(’20’, ‘gwei’) // Gas price
});
}).catch((error) => {
console.error(error);
});
}
}, []);
return (
<Provider provider={web3.