EOS 智能合约开发初步-HelloWorld

根据EOS的wiki，我执行

eoscpp -n hello

试图创建一个空项目，报出如下错误

cp: cannot stat ‘/home/chen/eos/build/install/share/skeleton/.’: No such file or directory

于是在网上搜索到文章Problem with eoscpp - wrong paths,参考这篇文章后成功解决这个问题！
查看hello.cpp代码，只实现了init和apply函数,

#include <hello.hpp>

/**
 *  The init() and apply() methods must have C calling convention so that the blockchain can lookup and
 *  call these methods.
 */
extern "C" {

    /**
     *  This method is called once when the contract is published or updated.
     */
    void init()  {
       eosio::print( "Init World!\n" );
    }

    /// The apply method implements the dispatch of events to this contract
    void apply( uint64_t code, uint64_t action ) {
       eosio::print( "Hello World: ", eosio::name(code), "->", eosio::name(action), "\n" );
    }

} // extern "C"

init函数，在部署合约时执行打印消息，打印三次：
1, eosd收到一个新transaction
2 ,eosd开始产出区块
3,eosd把这个区块追加到区块链，如同在网络上接收到区块一样。
applay函数在向合约发送消息时打印消息。也打印三次，没看懂

接下来编译hello.cpp代码

cd hello
eoscpp -o hello.wast hello.cpp

假设你的钱包已经解锁并且有${account}的密钥，我的环境下有一个wallet1钱包和一个account1账户准备好的，之前备份好wallet1.wallet放到data-dir下面，重新启动eosd，

解锁钱包wallet1

eosc wallet open -n wallet1
eosc wallet unlock -n wallet1

查看钱包里的keys

 eosc wallet keys

[[
    "EOS55FiCrEu5rdtPUuUhVbDCvUcvYF64PYHh9Lj39TrH58WHj2yLG",
    "5KdT7YKf6p4aHqSqwtmGjvqdkQ2d4ZbX31F1mmLShbQ2eSUEe9n"
  ],[
    "EOS6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV",
    "5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3"
  ],[
    "EOS7s1eAB9dbGnJzhhMbHnui1MA2PXbSycabio4JVDp9iJGAvRNSm",
    "5K5MhSgUbBCwDUdX3xRnZsBxapbq8CJ2uKvwS5kiMBchdmjY6Ea"
  ]
]

其中，一个是account1的owner key，一个是account1的active key，一个是inita账户的key
上面准备工作完成后，通过下面命令部署合约：

eosc set contract account1 hello.wast hello.abi

给合约发送消息：

 eosc push message account hello '"abcd"' --scope account1

EOS 智能合约开发初步-HelloWorld

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