Communication with deployed contracts Solidity: Guide
Ethereum in the world deployment contracts are the main aspect of decentralized programs (DAps). Although it is customary to communicate with these contracts using the Web3 Library, there are times when we have to bypass this restriction and communicate directly with the contracts deployed. In this article, we will examine how to communicate with the deployed contracts by claiming, focusing on both direct calls to other contract addresses and collection keywords.
Direct calls against Web3 Library
Before immersing the topic of communication with deployed contracts, it is necessary to understand the difference between direct calls and the interaction of the Web3 Library:
* Direct Calls
: You can send the message directly to the next contract address using the ContractDDRSS syntax.
* Example:
`
A contract call function {
Function of MyFUNCTION () Public Return (Line Memory) {
return the call Contract (Kitacontrat, MyFUNCTION);
}
}
`
* Web3 Library : Web3 Library provides an interface for interacting with Ethereum networks that allow you to submit requests and send messages to other contracts.
Communication with deployed contracts
You will need to use the Solid CallContrat and assembly keywords to interact with the Web3 library. Here are some examples:
1. Direct call
You can call directly to another contract address, passed it on as an argument to the CallContract feature:
`Solidarity
// Contract a
Pragma solidity ^0.8.0;
A contract call function {
// Function to interact with another contract
Function of MyFUNCTION () Public Return (Line Memory) {
return the call Contract (Kitacontrat, MyFUNCTION);
}
}
`
2. Using a set of keywords
You can also use ASSEMBLY keywords to make a direct call or send messages to other contracts:
`Solidarity
// Contract a
Pragma solidity ^0.8.0;
A contract call function {
// Function to interact with another contract
Function of MyFUNCTION () Public Return (Line Memory) {
// Send a message to another contract
Meeting
Let MSG = MJMPACK (Kitacontract, MyFUNCTION, 0)
Call (0, Msg, 0)
}
}
`
In this example, we use the MJMPACK feature that we will pack memory before sending it to another contract.
Example Use case
Here’s an example of how you can communicate with two contracts: A contract and contract. In a contract A, we define Myfunction, which returns the value of the line. Then we call this feature from another contract using direct calls or collection keywords:
`Solidarity
// Contract a
Pragma solidity ^0.8.0;
A contract call function {
// Function to interact with another contract
Function of MyFUNCTION () Public Return (Line Memory) {
Come back “Hello, world!”;
}
}
`
In this example, we call “Contracta.myfunction () directly or use the keywords of the set to send the message to the contract B:
`Solidarity
// Contract b
Pragma solidity ^0.8.0;
A contract call function {
// Function to interact with another contract
Function of MyFUNCTION () Public Return (Line Memory) {
Come back “Hello, world!”;
}
}
`
By following these guidelines and examples, you can now interact with the strict contracts deployed without relying on the Web3 Library.
Conclusion
Communication with deployed contracts is an essential aspect of decentralized programs. Realizing how to use direct calls and assembly keywords, you will be able to create more complex interactions between contracts and improve the overall understanding of Ethereum programming model.
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