C 区块链应用开发进阶案例
随着区块链技术的不断发展，越来越多的企业和开发者开始关注并尝试将区块链技术应用于实际项目中。C 作为一种功能强大的编程语言，在区块链应用开发中也扮演着重要角色。本文将围绕C语言，探讨区块链应用开发的进阶案例，旨在帮助读者深入了解C在区块链领域的应用。
案例一：基于C的简单区块链实现
1.1 案例背景
本案例将实现一个简单的区块链，用于存储一系列数据块，并确保数据不可篡改。
1.2 技术要点
- 使用C语言进行编程；
- 实现区块链的基本结构，包括区块、链等；
- 使用哈希算法确保数据不可篡改。
1.3 代码实现
csharp
using System;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Text;
public class Block
{
public int Index { get; set; }
public string PreviousHash { get; set; }
public string Timestamp { get; set; }
public string Data { get; set; }
public string Hash { get; set; }
public Block(int index, string previousHash, string data)
{
Index = index;
PreviousHash = previousHash;
Timestamp = DateTime.Now.ToString();
Data = data;
Hash = CalculateHash();
}
private string CalculateHash()
{
using (SHA256 sha256 = SHA256.Create())
{
byte[] bytes = Encoding.UTF8.GetBytes(Index + PreviousHash + Timestamp + Data);
byte[] hash = sha256.ComputeHash(bytes);
StringBuilder builder = new StringBuilder();
for (int i = 0; i < hash.Length; i++)
{
builder.Append(hash[i].ToString("x2"));
}
return builder.ToString();
}
}
}
public class Blockchain
{
public List Chain { get; private set; }
public Blockchain()
{
Chain = new List();
AddGenesisBlock();
}
private void AddGenesisBlock()
{
Chain.Add(new Block(0, "0", "Genesis Block"));
}
public void AddBlock(string data)
{
int index = Chain.Count;
string previousHash = Chain[index - 1].Hash;
Block newBlock = new Block(index, previousHash, data);
Chain.Add(newBlock);
}
public bool IsValid()
{
for (int i = 1; i < Chain.Count; i++)
{
Block currentBlock = Chain[i];
Block previousBlock = Chain[i - 1];
if (currentBlock.Hash != currentBlock.CalculateHash())
{
return false;
}
if (currentBlock.PreviousHash != previousBlock.Hash)
{
return false;
}
}
return true;
}
}
class Program
{
static void Main(string[] args)
{
Blockchain blockchain = new Blockchain();
blockchain.AddBlock("First block");
blockchain.AddBlock("Second block");
blockchain.AddBlock("Third block");
Console.WriteLine("Blockchain is valid: " + blockchain.IsValid());
}
}
案例二：C与以太坊智能合约交互
2.1 案例背景
本案例将展示如何使用C与以太坊智能合约进行交互，实现一个简单的转账功能。
2.2 技术要点
- 使用C语言进行编程；
- 使用Nethereum库与以太坊智能合约交互；
- 实现智能合约的部署和调用。
2.3 代码实现
csharp
using System;
using Nethereum.Web3;
using Nethereum.Web3.Accounts;
using Nethereum.GasService;
using Nethereum.RPC.Eth;
using Nethereum.RPC.Eth.TransactionManagement;
using Nethereum.RPC.Eth.Logs;
using Nethereum.RPC.JsonRpc;
using Nethereum.Hex.HexConvertors;
public class EthereumInteractions
{
private Web3 web3;
private Account account;
private Contract contract;
public EthereumInteractions(string infuraUrl, string privateKey)
{
web3 = new Web3(infuraUrl);
account = new Account(privateKey);
contract = new Contract(account, web3.Eth.GetContractAddress(), "YourContractABI");
}
public void DeployContract()
{
var gasProvider = new EthereumGasPriceProvider(web3);
var transaction = contract.GetDeployTransaction("YourContractByteCode", gasProvider);
var receipt = web3.Eth.DeployContract.SendRequestAsync(transaction).Result;
Console.WriteLine("Contract deployed at address: " + receipt.ContractAddress);
}
public void TransferEther(string toAddress, decimal amount)
{
var gasProvider = new EthereumGasPriceProvider(web3);
var transaction = web3.Eth.TransactionManager.SendTransactionAsync(account, toAddress, amount, gasProvider).Result;
Console.WriteLine("Transaction hash: " + transaction.TransactionHash);
}
public void ListenForEvents()
{
var filter = new FilterRequest("YourContractAddress", "0x", "latest");
var logService = new LogService(web3, contract.ContractAddress);
logService.LogsReceived += (logs) =>
{
foreach (var log in logs)
{
Console.WriteLine("Event received: " + log.Event);
}
};
logService.SubscribeAsync(filter);
}
}
class Program
{
static void Main(string[] args)
{
var ethInteractions = new EthereumInteractions("YourInfuraUrl", "YourPrivateKey");
ethInteractions.DeployContract();
ethInteractions.TransferEther("YourRecipientAddress", 1.0m);
ethInteractions.ListenForEvents();
}
}
总结
本文通过两个案例，展示了C在区块链应用开发中的应用。第一个案例实现了一个简单的区块链，第二个案例展示了如何使用C与以太坊智能合约进行交互。这些案例可以帮助读者更好地理解C在区块链领域的应用，并为实际项目开发提供参考。随着区块链技术的不断发展，相信C在区块链领域的应用将会更加广泛。
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