以太坊开发框架truffle入门指南-03 创建自己的数字货币

介绍

这次我们又要学习一个东西叫unbox

This box comes with everything you need to start using smart contracts from a react app. This is as barebones as it gets, so nothing stands in your way.

这是个啥呢，它里面有很多框架可以让我们开发啊的时候使用。比如你可以放里面放react、redux、Authentication、react-uport、pet-shop、webpack。

简单来说就是可以让我们用react来快速创建工程，开发智能合约。

创建项目

参考：https://github.com/truffle-box/react-box
首先创建一个目录

mkdir metacoin
cd metacoin

创建项目

truffle unbox react
Downloading...
Unpacking...
Setting up...
Unbox successful. Sweet!

Commands:

  Compile:              truffle compile
  Migrate:              truffle migrate
  Test contracts:       truffle test
  Test dapp:            npm test
  Run dev server:       npm run start
  Build for production: npm run build

测试一下

启动开发控制台

truffle develop

编译和移植

compile
migrate

启动前端

另开启一个命令窗口

npm run start

webpack-dev-server会自动打开浏览器
如果报错
Uncaught (in promise) Error: Contract has not been deployed to detected network (network/artifact mismatch)
参看上一篇解决办法：
https://www.jianshu.com/p/a685a0b2e2f1
一切正常的话，浏览器显示

image.png

创建代币

那接下来我们就要创建自己的代币啦，(≧▽≦)/激动
在 contracts目录下新建 MetaCoin.sol

pragma solidity ^0.4.0;


contract MetaCoin {
    mapping (address => uint) balances;

    function MetaCoin() {
        balances[tx.origin] = 500000;
    }

    function sendCoin(address receiver, uint amount) returns(bool sufficient) {
        if (balances[msg.sender] < amount) return false;
        balances[msg.sender] -= amount;
        balances[receiver] += amount;
        return true;
    }

    function getBalance(address addr) returns(uint) {
    return balances[addr];
    }
}

打开 migrations/2_deploy_contracts.js,添加 MetaCoin，修改如下

var SimpleStorage = artifacts.require("./SimpleStorage.sol");
var MetaCoin = artifacts.require("./MetaCoin.sol");


module.exports = function(deployer) {
  deployer.deploy(SimpleStorage);
  deployer.deploy(MetaCoin);
};

部署合约

启动truffle控制台

truffle console

编译、移植

truffle compile 
truffle migrate

部署合约

let cont;
MetaCoin.deployed().then( ins => cont = ins)

查看

查看coinbase余额

cont.getBalance(web3.eth.coinbase)
BigNumber { s: 1, e: 5, c: [ 500000 ] }
cont.getBalance(web3.eth.accounts[0])
BigNumber { s: 1, e: 5, c: [ 500000 ] }

第0个账户，也就是coinbase，有50000个以太币。

转账

接下来，我们往第一个账户转账试试
首先查看第一个账户余额

truffle(development)> cont.getBalance(web3.eth.accounts[1])
BigNumber { s: 1, e: 0, c: [ 0 ] }

余额是0；
转账

cont.sendCoin(web3.eth.accounts[1],2)
{ tx: '0x588f8f75294f2bc45ebf67bcd400d4981c2cf2a0be372a991ba31629374c8049',
  receipt:
   { transactionHash: '0x588f8f75294f2bc45ebf67bcd400d4981c2cf2a0be372a991ba31629374c8049',
     transactionIndex: 0,
     blockHash: '0x703a36c0761ecc1b267db1e0160d34bd502e036c0af6b58db987fdaddfbe573b',
     blockNumber: 36,
     gasUsed: 49110,
     cumulativeGasUsed: 49110,
     contractAddress: null,
     logs: [],
     status: 1 },
  logs: [] }
truffle(development)>

在此查看余额

truffle(development)> cont.getBalance(web3.eth.coinbase)
BigNumber { s: 1, e: 5, c: [ 499998 ] }
truffle(development)> cont.getBalance(web3.eth.accounts[1])
BigNumber { s: 1, e: 0, c: [ 2 ] }

下一篇：以太坊开发框架truffle入门指南-03 创建创建转账界面。

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