技术贴：教你在Unity中更新智能合约数据

概述

本文将介绍如何从Unity内部的以太坊智能合约中更新/更改数据。

先决条件

创建一个Unity项目

导入的Nethereum库

部署智能合约：带有合约地址的代码

下载的VS Code和Solidity插件

创建C＃定义

在VS代码中打开solidity代码。确保安装了Solidity插件。右键单击合约并选择Solidity Compile and Code generate CSharp contract definition下面是排行榜合约的一个示例。

它应该在

/CONTRACT_NAME/ContractDefinition/CONTRACT_NAME_Definition.cs

这是LeaderboardDefinition.cs的示例

// LeaderboardDefinition.csusing System;using System.Threading.Tasks;using System.Collections.Generic;using System.Numerics;using Nethereum.Hex.HexTypes;using Nethereum.ABI.FunctionEncoding.Attributes;using Nethereum.Web3;using Nethereum.RPC.Eth.DTOs;using Nethereum.Contracts.CQS;using Nethereum.Contracts;using System.Threading;namespace LeaderboardContract.Contracts.Leaderboard.ContractDefinition{ public partial class LeaderboardDeployment : LeaderboardDeploymentBase { public LeaderboardDeployment() : base(BYTECODE) { } public LeaderboardDeployment(string byteCode) : base(byteCode) { } } public class LeaderboardDeploymentBase : ContractDeploymentMessage { public static string BYTECODE = "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"; public LeaderboardDeploymentBase() : base(BYTECODE) { } public LeaderboardDeploymentBase(string byteCode) : base(byteCode) { } } public partial class AddScoreFunction : AddScoreFunctionBase { } [Function("addScore", "bool")] public class AddScoreFunctionBase : FunctionMessage { [Parameter("string", "user", 1)] public virtual string User { get; set; } [Parameter("uint256", "score", 2)] public virtual BigInteger Score { get; set; } } public partial class LeaderboardFunction : LeaderboardFunctionBase { } [Function("leaderboard", typeof(LeaderboardOutputDTO))] public class LeaderboardFunctionBase : FunctionMessage { [Parameter("uint256", "", 1)] public virtual BigInteger ReturnValue1 { get; set; } } public partial class LeaderboardOutputDTO : LeaderboardOutputDTOBase { } [FunctionOutput] public class LeaderboardOutputDTOBase : IFunctionOutputDTO  { [Parameter("string", "user", 1)] public virtual string User { get; set; } [Parameter("uint256", "score", 2)] public virtual BigInteger Score { get; set; } }}

注意AddScoreFunction用于更新排行榜。它接受两个参数

1. user

2. score

该文件应复制到Unity项目。

给Unity添加C#定义

打开您的Unity项目，并确保已添加Nethereum .dll文件。如果尚未完成，请检查第1部分。

接下来，通过将文件拖到上方将合同定义添加到您的统一项目中。

从以太坊合约更新数据

现在一切都设置好了，创建一个脚本来从智能合约中获取数据。

出于演示目的，请在Main Camera中创建脚本

命名为UpdateLeaderboard

打开UpdateLeaderboard.cs并更新脚本。

注意：在下面的代码中添加您的私钥。

// UpdateLeaderboard.csusing System.Collections;using System.Collections.Generic;using UnityEngine;// using Nethereum RPCusing Nethereum.JsonRpc.UnityClient;// using contract definitionusing LeaderboardContract.Contracts.Leaderboard.ContractDefinition;public class UpdateLeaderboard : MonoBehaviour{ // Start is called before the first frame update void Start() { StartCoroutine(UpdateScore()); } public IEnumerator UpdateScore() { string url = "https://rinkeby.infura.io/v3/7238211010344719ad14a89db874158c"; string privateKey = "PRIVATE_KEY_HERE"; string fromAddress = "0x06C403f435d63835D027F517C2a231a663a1cF5E"; string contractAddress = "0xfeF8684259C1CBf3F436A57D83A5EB78b0D0bfcC"; var transactionTransferRequest = new TransactionSignedUnityRequest(url, privateKey); var transactionMessage = new AddScoreFunction { FromAddress = fromAddress, User = "gavin", Score = 4, }; yield return transactionTransferRequest.SignAndSendTransaction(transactionMessage, contractAddress); print(transactionTransferRequest.Result); }}

有关更多信息：https://github.com/Nethereum/Unity3dSimpleSample#transfer-transaction

运行您的项目并检查控制台

复制交易ID并检查区块浏览器。

恭喜你！您成功了。