Fetching ETH Smart Contract Data in Unity

Fetch blockchain data in Unity

Overview

This article will go over how to fetch data from an Ethereum smart contract inside of Unity.

Prerequisites

• Created a Unity Project
• Imported Nethereum Library
• Deployed a smart contract: code with contract address
• Downloaded VS Code and Solidity Plugin

If you haven’t completed the prerequisites, check out Part 1: Using Nethereum in Unity and Create and Deploy and Ethereum Leaderboard.

Create C# Definition

Open the solidity code in VS Code. Make sure the Solidity Plugin is installed. Right click the contract and select Solidity Compile and Code generate CSharp contract definition Below is an example of a Leaderboard contract.

It should generate a contract definition under /CONTRACT_NAME/ContractDefinition/CONTRACT_NAME_Definition.cs

Here’s an example of LeaderboardDefinition.cs

NoticeLeaderboardFunction is used to view who’s in 1st, 2nd, 3rd etc place. The function accepts a uint parameter.

For example:

0 returns 1st place

1 returns 2nd place

2 returns 3rd place

etc.

This file should be copied over to the Unity project.

Adding C# Definition to Unity

Open your Unity project and make sure the Nethereum .dll files are already added. Check Part 1 if this isn’t completed.

Next, add the contract definition to your unity project by dragging the file over.

Fetch Data From an Ethereum Contract

Now that everything is set up, create a script to fetch data from a smart contract.

For demonstration purposes, create a script in the Main Camera

Name it Leaderboard

Open Leaderboard.cs and update the script.

new LeaderboardFunction() {ReturnValue1 = 0}

means

who’s in first place?!

For more information: https://github.com/Nethereum/Unity3dSimpleSample#query-smart-contract

Give your project a run and check the Console

Congratulations! You’re able to fetch data from a decentralized source.

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