不管是C、C++、Java還是任何其他語(yǔ)言，一般剛開始學(xué)習(xí)的時(shí)候，我們都會(huì)從HelloWorld開始，這篇文章主要講解EOS DAWN-V3.0.0?智能合約開發(fā)之Hello World。

在看這篇文章之前，請(qǐng)先閱讀下面兩篇入門文章。

• 第一篇 - 手把手教你理清EOS各種開發(fā)環(huán)境搭建來龍去脈
• 第二篇 - EOS Currency 合約案例

1. 編寫合約代碼

在桌面創(chuàng)建一個(gè)文件夾，比如：0418，用Atom打開0418文件夾。新建文件Hello.cpp文件，并將下面的源碼拷貝到Hello.cpp文件中。

#include <eosiolib/eosio.hpp> #include <eosiolib/print.hpp>// 視頻網(wǎng)站：http://kongyixueyuan.com // 個(gè)人博客：http://liyuechun.org // 公眾號(hào)：區(qū)塊鏈部落 // 進(jìn)技術(shù)群，請(qǐng)加微信（kongyixueyuan）//用eosio命名空間 using namespace eosio;//所有的智能合約都繼承自contract類 class Hello : public eosio::contract {public:using contract::contract;/// @abi actionvoid hi( account_name user ) {print( "Hello, ", name{user} );}}; EOSIO_ABI( Hello, (hi) )

2. 生成.wast文件

liyuechun:Project yuechunli$ eosiocpp -o Hello.wast Hello.cpp liyuechun:Project yuechunli$ ls Hello.cpp Hello.wast liyuechun:Project yuechunli$

3. 生成.abi文件

liyuechun:Project yuechunli$ eosiocpp -g Hello.abi Hello.cpp Generated Hello.abi ... liyuechun:Project yuechunli$ ls Hello.abi Hello.cpp Hello.wast liyuechun:Project yuechunli$

• Hello.abi文件內(nèi)容如下：

{"____comment": "This file was generated by eosio-abigen. DO NOT EDIT - 2018-04-18T08:15:50","types": [],"structs": [{"name": "hi","base": "","fields": [{"name": "user","type": "account_name"}]}],"actions": [{"name": "hi","type": "hi","ricardian_contract": ""}],"tables": [],"clauses": [] }

4. 創(chuàng)建錢包賬號(hào)

4.1 創(chuàng)建錢包

liyuechun:Hello yuechunli$ cleos wallet create Creating wallet: default Save password to use in the future to unlock this wallet. Without password imported keys will not be retrievable. "PW5J3rx7Bfg9zb8Kf2owTytccFyJqtDTrqnUX8iBRRUvbwM8RyzRL"

PW5J3rx7Bfg9zb8Kf2owTytccFyJqtDTrqnUX8iBRRUvbwM8RyzRL必須保存好，解鎖錢包時(shí)需要使用到這個(gè)密碼。

4.2 創(chuàng)建兩組key

liyuechun:Hello yuechunli$ ./cleos create key -bash: ./cleos: No such file or directory liyuechun:Hello yuechunli$ cleos create key Private key: 5K7QdknUZsF9apdBhD8TDMZGJjw8zJ8esYwS173YyFRv2453Z9t Public key: EOS5RU8VsYBLnN5snGeUKmt1sDDzpvQbGyW7LPP6qEryaFctYieCK liyuechun:Hello yuechunli$ cleos create key Private key: 5J8kComGiQHZyNmH6VvkHgtFggeQemazLpihKR4QW75DNkWTVdA Public key: EOS5fqiC3VFAJ1riMrKf8vzD28nqd4EpXvZGpXt6YewEBnH8DYinG

4.3 向錢包導(dǎo)入私鑰

liyuechun:Hello yuechunli$ cleos wallet import 5K7QdknUZsF9apdBhD8TDMZGJjw8zJ8esYwS173YyFRv2453Z9t imported private key for: EOS5RU8VsYBLnN5snGeUKmt1sDDzpvQbGyW7LPP6qEryaFctYieCK liyuechun:Hello yuechunli$ cleos wallet import 5J8kComGiQHZyNmH6VvkHgtFggeQemazLpihKR4QW75DNkWTVdA imported private key for: EOS5fqiC3VFAJ1riMrKf8vzD28nqd4EpXvZGpXt6YewEBnH8DYinG

4.4 創(chuàng)建賬戶

liyuechun:cleos yuechunli$ ./cleos create account eosio liyc111 EOS5RU8VsYBLnN5snGeUKmt1sDDzpvQbGyW7LPP6qEryaFctYieCK EOS5fqiC3VFAJ1riMrKf8vzD28nqd4EpXvZGpXt6YewEBnH8DYinG

5. 部署合約

liyuechun:build yuechunli$ cleos set contract liyc111 ./contracts/Hello Reading WAST/WASM from ./contracts/Hello/Hello.wast... Assembling WASM... Publishing contract... executed transaction: 21d891e425f3d65852432e2b6a78146e2e2992a267c9f28c8ce56cd5dbea98f2 1632 bytes 2200576 cycles # eosio <= eosio::setcode {"account":"liyc111","vmtype":0,"vmversion":0,"code":"0061736d0100000001370b60027f7e0060027e7e006001... # eosio <= eosio::setabi {"account":"liyc111","abi":{"types":[],"structs":[{"name":"hi","base":"","fields":[{"name":"user","t... liyuechun:build yuechunli$ cleos get code liyc111 code hash: e387951f9a18870f2c151fbceea5b279a3861bdabab58ea87a67296a8a6583d0 liyuechun:build yuechunli$

6. 執(zhí)行合約

6.1 解鎖錢包

PW5J3rx7Bfg9zb8Kf2owTytccFyJqtDTrqnUX8iBRRUvbwM8RyzRL是創(chuàng)建錢包是的密碼。

liyuechun:build yuechunli$ cleos wallet unlock --password PW5J3rx7Bfg9zb8Kf2owTytccFyJqtDTrqnUX8iBRRUvbwM8RyzRL Unlocked: default

6.2 執(zhí)行合約

liyuechun:build yuechunli$ cleos push action liyc111 hi '{"user":"liyc1215"}' -p liyc111 executed transaction: 9abcaec2711ce31c693e5124af507f34aa666702bd5bb230ec31ddd6903248a8 232 bytes 102400 cycles # liyc111 <= liyc111::hi {"user":"liyc1215"} >> Hello, liyc1215 liyuechun:build yuechunli$ http://liyuechun.org/2018/04/18/eos-contract/

總結(jié)

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