determine which character was invested in your contract
When developing an intelligent agreement and implementing the user’s investment functions, ensuring that users can monitor all -allocated cods are crucial to openness and safety. In this article, we will examine how to determine which brand the user has set up in your contract.
Understanding the standard ERC20 ID
Before diving into a solution, it is necessary to understand the ERC20. The ERC-20 is an open standard for representing digital cod and trading designed by Ethereum’s founder Joseph Lubi. Tokens can represent a variety of funds such as cryptocurrency, art, or even signs of use.
Using the EtherScan application subscription to follow Stated to watch
One approach determines which ID the user has injected into the contract is to use the Etherscan application subscription provided by Polygon (formerly Matic). Etherscan lets you ask your intelligent contracts and retrieve information about injected property with its built -in functions.
Here’s an example of how you can use the Etherscan application subscription to observe plugs:
- Create a contract address
: Replace
Your_Contract_addressIntelligent Agreement at address.
2 This function returns an object containing information about the agreement.
Example:
`Javascript
Function GutstuKedtokens (address, tokenaddress) {
Const Account = Etherscan.connect ();
Const Result = Wait account.getaccountsbytenid ({tokenid: tokenaddress});
return result;
}
`
- Call the action : When a user takes his or her ID to your contract, call the
GetstateTTOKENS 'function with their address and Token ID.
Example:
Javascript
// The user has injected ETH
Userstadadh = Wait Getstaketytoken (Useraddress, ‘0x1234567890ABCDEF’);
`
- Member Result : The EtherScan application subscription returns an object containing information on each of your accounts contract. Member of this object to determine which cuffs the user has kept.
Example:
`Javascript
// The user has invested in 100 ETH Ethereum account
Userstaboketh = {
Account: ‘0x1234567890ABCDEF’,
Balance: 100,
Tokenit: [‘eth’, ‘eth’, …] // for more information about the Pasted Pigs
};
Console.log (Userstaketh.tokkens);
// Departure: [‘ETH’]
`
Other aspects
Although the use of the EtherScan application is a reliable way to follow the characters equipped, there are some restrictions and aspects:
* Gas Costs : Using the EtherScan application subscription causes gas costs in the intelligent contract survey. This can be expensive for large contracts or complex queries.
* Online Fees : If you use a decentralized application (DAPP) in Ethereum or other Blockchain networks, you can charge online fees by inquiring about an intelligent contract.
conclusion
What was set up in your contract is now easier with the Eterscan application interface. By understanding how smart contracts ask and structure the result, you can provide users with valuable information about their all -all -alliance. Although there are some restrictions and aspects in mind, this approach provides a reliable and effective way to manage the user’s investment functions.