Write your own smart contract Hello_eos

After continuing with the EOS contract, let's create our first contract, Hello World.

Reference documentation This document has been changing and has never been overtaken.

Terminal closed, so we need to reopen the wallet.

feng@feng-b250-hd3p:~/workspace/eos/build/programs/cleos$./cleos Wallet List
wallets:
[]
feng@feng-b250-hd3p:~/workspace/eos/build/programs/cleos$./cleos Wallet Open
Opened:default
feng@feng-b250-hd3p:~/workspace/eos/build/programs/cleos$./cleos Wallet List
wallets:
[
  "Default"
]
feng@feng-b250-hd3p:~/workspace/eos/build/programs/cleos$./cleos Wallet Unlock
password:Unlocked:default
feng@feng-b250-hd3p:~/workspace/eos/build/programs/cleos$./cleos Wallet List
Wallets:
[
  "Default *"
]

Get the current public and private key

feng@feng-b250-hd3p:~/workspace/eos/build/programs/cleos$./cleos wallet Keys
[[
    ] Eos5a7fk4raq2fzdwy5ttrdhmchpzqxwyolqvczqhhpcgsjofdskk ",
    " 5JO5M9MXS7XZWRCWJDY1QVRMWXITE4MOURX9WAJLJUA8WD1LRJX "
  ],[
    " EOS6MRYAJQQ8UD7HVNYCFNVPJQCVPSCN5SO8BHTHUGYQET5GDW5CV ",
    " 5kqwrpbwdl6phxujxw37fssqz1jiwsst4cqqzdeyxtp79zkvfd3 "
  ]
]

View an existing account based on the public key

feng@feng-b250-hd3p:~/workspace/eos/build/programs/cleos$./cleos Get Accounts EOS5A7FK4RAQ2FZDWY5TTRDHMCHPZQXWYOLQVCZQHHPCGSJOFDSKK
{
  "account_names": [
    "Eosio.token",
    "ex ",
    " Tester ","
    user "
  ]
}

Generate Contract File:

Create Hello folders and hello/hello.cpp files under the build/contracts/directory yourself

#include <eosiolib/eosio.hpp>
#include <eosiolib/print.hpp>
using namespace Eosio;

Class Hello:public Eosio::contract {public
  :
      using Contract::contract;

      @abi action 
      void Hi (account_name user) {
         print ("Hello,", Name{user});
      }
;

Eosio_abi (Hello, (HI))

Generate wast files and Abi files

feng@feng-b250-hd3p:~/workspace/eos/build/contracts/hello$ eosiocpp-o hello.wast hello.cpp in file included from Hello . cpp:1: In file included From/usr/local/include/eosiolib/eosio.hpp:7: in file included From/usr/local/include/eosiolib /action.hpp:7: In file included From/usr/local/include/eosiolib/datastream.hpp:9: in file included from/home/feng/opt/ Boost_1_66_0/include/boost/container/flat_map.hpp:26:in file included from/home/feng/opt/boost_1_66_0/include/ Boost/container/new_allocator.hpp:24:/HOME/FENG/OPT/BOOST_1_66_0/INCLUDE/BOOST/CONTAINER/THROW_EXCEPTION.HPP : 56:21:warning:address of array ' msg ' would always evaluate to ' true ' [-wpointer-bool-conversion] BOOS
                   T_assert (!MSG); ~^~~/home/feng/opt/boost_1_66_0/include/boost/assert.hpp:60:36:note:expanded from Macro ' BOOST_ASSERT ' # define B Oost_assert (expr) ASSERT (expr) ^~~~/usr/local/include/musl/upstream/include/assert.h:8 : 28:note:expanded from macro ' assert ' #define ASSERT (x) ((void) ((x) | | (__assert_fail (#x, __file__, __line__, ... ^ in file included from Hello.cpp:1: in file include D from/usr/local/include/eosiolib/eosio.hpp:7: In file included From/usr/local/include/eosiolib/action.hpp:7: in file Included From/usr/local/include/eosiolib/datastream.hpp:9: in file included From/home/feng/opt/boost_1_66_0/include /boost/container/flat_map.hpp:26:in file included From/home/feng/opt/boost_1_66_0/include/boost/container/new_ Allocator.hpp:24:/home/feng/opt/boost_1_66_0/include/boost/container/throw_exception.hpp:64:25:warning:address
                       of array ' msg ' would always evaluate to ' true ' [-wpointer-bool-conversion] boost_assert_msg (!msg, str); ~^~~/home/feng/opt/boost_1_66_0/include/boost/assert.hpp:61:46:note:expanded from Macro ' BOOST_A
                          Ssert_msg ' # define BOOST_ASSERT_MSG (expr, msg) ASSERT ((expr) && (msg)                   ^~~~/usr/local/include/musl/upstream/include/assert.h:8:28:note:expanded from Macro ' assert ' # Define ASSERT (x) ((void) (x) | | (__assert_fail (#x, __file__, __line__, ... ^ in file included from Hello.cpp:1: in file include D from/usr/local/include/eosiolib/eosio.hpp:7: In file included From/usr/local/include/eosiolib/action.hpp:7: in file Included From/usr/local/include/eosiolib/datastream.hpp:9: in file included From/home/feng/opt/boost_1_66_0/include /boost/container/flat_map.hpp:26:in file included From/home/feng/opt/boost_1_66_0/include/boost/container/new_ Allocator.hpp:24:/home/feng/opt/boost_1_66_0/include/boost/container/throw_exception.hpp:72:25:warning:address
                       of array ' msg ' would always evaluate to ' true ' [-wpointer-bool-conversion] boost_assert_msg (!msg, str); ~^~~/home/feng/opt/boost_1_66_0/include/boost/assert.hpp:61:46:note:expanded from Macro ' BOOST_A
Ssert_msg '# define BOOST_ASSERT_MSG (expr, msg) ASSERT ((expr) && (msg) ^~~~/usr/ local/include/musl/upstream/include/assert.h:8:28:note:expanded from macro ' assert ' #define ASSERT (x) ((void) (x) || (__assert_fail (#x, __file__, __line__, ... ^ in file included from Hello.cpp:1: in file include D from/usr/local/include/eosiolib/eosio.hpp:7: In file included From/usr/local/include/eosiolib/action.hpp:7: in file Included From/usr/local/include/eosiolib/datastream.hpp:9: in file included From/home/feng/opt/boost_1_66_0/include /boost/container/flat_map.hpp:26:in file included From/home/feng/opt/boost_1_66_0/include/boost/container/new_ Allocator.hpp:24:/home/feng/opt/boost_1_66_0/include/boost/container/throw_exception.hpp:80:25:warning:address
                       of array ' msg ' would always evaluate to ' true ' [-wpointer-bool-conversion] boost_assert_msg (!msg, str); ~^~~/home/feng/opt/boost_1_66_0/include/boost/assert.hpp:61:46:note:expanded from Macro ' boost_assert_msg ' # define BOOST_ASSERT_MSG (exp R, msg) assert ((expr) && (msg) ^~~~/usr/local/include/musl/upstream/i nclude/assert.h:8:28:note:expanded from macro ' assert ' #define ASSERT (x) ((void) ((x) | | (__assert_fail (#x, __file__, __line__, ... ^ in file included from Hello.cpp:1: in file include D from/usr/local/include/eosiolib/eosio.hpp:7: In file included From/usr/local/include/eosiolib/action.hpp:7: in file Included From/usr/local/include/eosiolib/datastream.hpp:9: in file included From/home/feng/opt/boost_1_66_0/include /boost/container/flat_map.hpp:26:in file included From/home/feng/opt/boost_1_66_0/include/boost/container/new_ Allocator.hpp:24:/home/feng/opt/boost_1_66_0/include/boost/container/throw_exception.hpp:88:25:warning:address of array ' msg ' would always evaluate to ' true ' [-wpointer-bool-Conversion] Boost_assert_msg (!msg, str); ~^~~/home/feng/opt/boost_1_66_0/include/boost/assert.hpp:61:46:note:expanded from Macro ' BOOST_ASSERT_MSG ' # Defi Ne boost_assert_msg (expr, msg) ASSERT ((expr) && (msg) ^~~~/usr/local/ include/musl/upstream/include/assert.h:8:28:note:expanded from macro ' assert ' #define ASSERT (x) ((void) ((x) | | (__assert_fail (#x, __file__, __line__, ... ^ 5 warnings generated. FENG@FENG-B250-HD3P:~/WORKSP ace/eos/build/contracts/hello$ eosiocpp-g Hello.abi hello.cpp generated Hello.abi ...

The following creates a new contract account Hello.code

feng@feng-b250-hd3p:~/workspace/eos/build/programs/cleos$./cleos Create account Eosio Hello.code EOS5A7FK4RAQ2FZDWY5TTRDHMCHPZQXWYOLQVCZQHHPCGSJOFDSKK EOS5A7FK4RAQ2FZDWY5TTRDHMCHPZQXWYOLQVCZQHHPCGSJOFDSKK
executed transaction:83280e9bf4885b0083c28bda2ce5f303c7838c51b56991c59b825facd4b7c4e6  364 bytes  1000 Cycles
#         Eosio <= eosio::newaccount            {"creator": "Eosio", "name": "Hello.code", "owner": {" Threshold ": 1," Keys ": [{" Key ":" Eos5a7fk4raq2fzdwy5ttr ...

Deploy the contract to the Hello Directory

feng@feng-b250-hd3p:~/workspace/eos/build/contracts/hello$  .. /.. /programs/cleos/cleos set contract Hello.code. /hello-p hello.code
Reading wast ...
Assembling WASM
... Publishing Contract
... Executed transaction:295564fe81b0afbe87985310bf0529acc0bfeae73fcdaa2a44184cb8d3429135  1676 bytes  10000 Cycles
#         Eosio <= eosio::setcode               {"Account": "Hello.code", "Vmtype": 0, "vmversion": 0, "code": "
0061736d01000000018b011460027f7e0060057e7e7 ... #         Eosio <= eosio::setabi                {"Account": "Hello.code", "Abi": {"Types": [], "structs": [{"Name": "Hi", "base": "" , ' Fields ': [{' Name ': ' User ' ...

Contract execution

feng@feng-b250-hd3p:~/workspace/eos/build/contracts/hello$.. /.. /programs/cleos/cleos Push action Hello.code hi ' [user] '-p user
executed transaction: B829b84c96116142fcd14f87ae339742f625f55f7d018fefcb4a4809683e4b93  244 bytes  1000 Cycles
#    Hello.code <= hello.code::hi               {"User": "User"}
>> Hello, user

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