Solidity实现智能合约

Posted 2022-01-01 ZhangJiQun.

目录

将生成代码在geth 客户端运行；

err="authentication needed: password or unlock"Error: authentication needed: password or unlock undefined

Object has no number say: hello.say（）不能调用

这时候需要miner 去挖下矿（记账）

出现Contract mined ！ hello.say()

Solidity实现简单的智能合约

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将生成代码在geth 客户端运行；

Remix网页版仅仅是我们使用Solidity语言编写的程序进行编译，生成对应的代码能在geth中运行而已。

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合约代码：

pragma solidity ^0.4.18;
contract hello 
    string greeting;
 
    function hello(string _greeting) public 
        greeting = _greeting;
    
 
    function say() constant public returns (string) 
        return greeting;
    

生成代码：

var _greeting = "Hello World" ;
var helloContract = web3.eth.contract(["constant":true,"inputs":[],"name":"say","outputs":["name":"","type":"string"],"payable":false,"stateMutability":"view","type":"function","inputs":["name":"_greeting","type":"string"],"payable":false,"stateMutability":"nonpayable","type":"constructor"]);
var hello = helloContract.new(
   _greeting,
   
     from: web3.eth.accounts[1],
     data: '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',
     gas: '4700000'
   , function (e, contract)
    console.log(e, contract);
    if (typeof contract.address !== 'undefined') 
         console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash);
    
 );

err="authentication needed: password or unlock"
Error: authentication needed: password or unlock undefined

解锁下用户：personal.unlockAccount(eth.accounts[1])

Object has no number say: hello.say（）不能调用

这时候需要miner 去挖下矿（记账）

miner.start();admin.sleepBlocks(1);miner.stop()   

出现Contract mined ！ hello.say()

Solidity实现简单的智能合约

Remix网页版仅仅是我们使用Solidity语言编写的程序进行编译，生成对应的代码能在geth中运行而已。

合约代码：

pragma solidity ^0.4.18;
contract hello 
    string greeting;
 
    function hello(string _greeting) public 
        greeting = _greeting;
    
 
    function say() constant public returns (string) 
        return greeting;
    

生成代码：

var _greeting = "Hello World" ;
var helloContract = web3.eth.contract(["constant":true,"inputs":[],"name":"say","outputs":["name":"","type":"string"],"payable":false,"stateMutability":"view","type":"function","inputs":["name":"_greeting","type":"string"],"payable":false,"stateMutability":"nonpayable","type":"constructor"]);
var hello = helloContract.new(
   _greeting,
   
     from: web3.eth.accounts[1],
     data: '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',
     gas: '4700000'
   , function (e, contract)
    console.log(e, contract);
    if (typeof contract.address !== 'undefined') 
         console.log('Contract mined! address: ' + contract.address + ' transactionHash: ' + contract.transactionHash);
    
 );

Remix - Ethereum IDE

打开之后首页会是这样的。接下来我向大家演示一下如何实现helloworld

接下来我们先创建文件夹以及.sol文件


接下来开始编写一个简单的合约

编写完之后我们进行编译，部署

我们在println输入helloworld时，就会发现能够成功输出了。