EOS学习实战(三)教你如何发币！

学习区块链，最刺激的莫过于发币，第一篇文章里介绍了如何搭建EOS开发环境，第二篇文章我们已经介绍了如何部署调用合约，实际上隐含着对钱包和账号的操作！

这一篇我们重点介绍智能合约如何发币！既如何用(yekai)给(dinglinlin)发币。提示：本篇篇幅较长请耐新阅读。

另，为方便大家交流，需要EOS实战系列代码的小伙伴可以加QQ2082049536索要，希望跟大家一同进步。

使用eosio.token发币

我们先将eos官方给提供的eosio.token代码拷贝到开发目录。

yekaideMacBook-Pro:contracts yk$ cp -r ~/eoshome/eos/contracts/eosio.token/ eosio.token

yekaideMacBook-Pro:contracts yk$ ls

bak eosio.token

database jing tic_tac_toe

debug moment

yekaideMacBook-Pro:contracts yk$ cd eosio.token/

yekaideMacBook-Pro:eosio.token yk$ ls

CMakeLists.txt eosio.token.abi eosio.token.cpp eosio.token.hpp

同样得到abi文件，hpp文件，cpp文件，缺少wast文件，通过eosiocpp可以生成！

yekaideMacBook-Pro:eosio.token yk$ eosiocpp -o eosio.token.wast eosio.token.cpp eosio.token.cpp:6:10: fatal error: 'eosio.token/eosio.token.hpp' file not found#include ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1 error generated.

上述有一个错误，我们需要修改cpp包含头文件的路径，在本目录下编译路径有点问题。修改为 "eosio.token.hpp"。

/**

* @file

* @copyright defined in eos/LICENSE.txt

*/

#include "eosio.token.hpp"

namespace eosio {

void token::create( account_name issuer,

asset maximum_supply,

uint8_t issuer_can_freeze,

uint8_t issuer_can_recall,

uint8_t issuer_can_whitelist )

{

require_auth( _self );

auto sym = maximum_supply.symbol;

eosio_assert( sym.is_valid(), "invalid symbol name" );

eosio_assert( maximum_supply.is_valid(), "invalid supply");

eosio_assert( maximum_supply.amount > 0, "max-supply must be positive");

stats statstable( _self, sym.name() );

auto existing = statstable.find( sym.name() );

eosio_assert( existing == statstable.end(), "token with symbol already exists" );

statstable.emplace( _self, [&]( auto& s ) {

s.supply.symbol = maximum_supply.symbol;

s.max_supply = maximum_supply;

s.issuer = issuer;

s.can_freeze = issuer_can_freeze;

s.can_recall = issuer_can_recall;

s.can_whitelist = issuer_can_whitelist;

});

}

void token::issue( account_name to, asset quantity, string memo )

{

print( "issue" );

auto sym = quantity.symbol.name();

stats statstable( _self, sym );

const auto& st = statstable.get( sym );

require_auth( st.issuer );

eosio_assert( quantity.is_valid(), "invalid quantity" );

eosio_assert( quantity.amount > 0, "must issue positive quantity" );

eosio_assert( quantity <= st.max_supply - st.supply, "quantity exceeds available supply");

statstable.modify( st, 0, [&]( auto& s ) {

s.supply += quantity;

});

add_balance( st.issuer, quantity, st, st.issuer );

if( to != st.issuer )

{

SEND_INLINE_ACTION( *this, transfer, {st.issuer,N(active)}, {st.issuer, to, quantity, memo} );

}

}

void token::transfer( account_name from,

account_name to,

asset quantity,

string /*memo*/ )

{

print( "transfer" );

require_auth( from );

auto sym = quantity.symbol.name();

stats statstable( _self, sym );

const auto& st = statstable.get( sym );

require_recipient( from );

require_recipient( to );

eosio_assert( quantity.is_valid(), "invalid quantity" );

eosio_assert( quantity.amount > 0, "must transfer positive quantity" );

sub_balance( from, quantity, st );

add_balance( to, quantity, st, from );

}

void token::sub_balance( account_name owner, asset value, const currency_stats& st ) {

accounts from_acnts( _self, owner );

const auto& from = from_acnts.get( value.symbol.name() );

eosio_assert( from.balance.amount >= value.amount, "overdrawn balance" );

if( has_auth( owner ) ) {

eosio_assert( !st.can_freeze || !from.frozen, "account is frozen by issuer" );

eosio_assert( !st.can_freeze || !st.is_frozen, "all transfers are frozen by issuer" );

eosio_assert( !st.enforce_whitelist || from.whitelist, "account is not white listed" );

} else if( has_auth( st.issuer ) ) {

eosio_assert( st.can_recall, "issuer may not recall token" );

} else {

eosio_assert( false, "insufficient authority" );

}

from_acnts.modify( from, owner, [&]( auto& a ) {

a.balance -= value;

});

}

void token::add_balance( account_name owner, asset value, const currency_stats& st, account_name ram_payer )

{

accounts to_acnts( _self, owner );

auto to = to_acnts.find( value.symbol.name() );

if( to == to_acnts.end() ) {

eosio_assert( !st.enforce_whitelist, "can only transfer to white listed accounts" );

to_acnts.emplace( ram_payer, [&]( auto& a ){

a.balance = value;

});

} else {

eosio_assert( !st.enforce_whitelist || to->whitelist, "receiver requires whitelist by issuer" );

to_acnts.modify( to, 0, [&]( auto& a ) {

a.balance += value;

});

}

}

} /// namespace eosio

EOSIO_ABI( eosio::token, (create)(issue)(transfer) )

yekaideMacBook-Pro:eosio.token yk$

再次执行编译生成wast文件

yekaideMacBook-Pro:eosio.token yk$ eosiocpp -o eosio.token.wast eosio.token.cpp

终于可以发币了

有可能看到如图所示，这是由于nodes重启后，钱包需要解锁，此时上篇提到的钱包密码在此处就将有用武之地了！

yekaideMacBook-Pro:eosio.token yk$ cleos wallet unlock

输入钱包密码就会解锁成功了！再次发布合约！

yekaideMacBook-Pro:eosio.token yk$ cleos set contract yekai ../eosio.token/

Reading WAST/WASM from ../eosio.token/eosio.token.wast...

Assembling WASM...

Publishing contract...

executed transaction: 0cfdf14e4d5d7351b31ba88a029b9c96693fdaf9d9f7738738356cb01ad48dff 8320 bytes 2200576 cycles

# eosio <= eosio::setcode {"account":"yekai","vmtype":0,"vmversion":0,"code":"0061736d010000000181011560067f7e7f7f7f7f0060057f...

# eosio <= eosio::setabi {"account":"yekai","abi":{"types":[],"structs":[{"name":"transfer","base":"","fields":[{"name":"from...

看到上述结果代表成了！激动人心的时刻也开始了！

马上发币，手里有币，心里不慌

计划发布一个叶开币，持币的可以找我换飞刀！需要指定发行者issuer，指定最大发行量以及币符号（YKC），还有三个参数can_freeze，can_recall，can_whitelist分别代表是否可以冻结，是否可以回收，是否使用白名单。

yekaideMacBook-Pro:eosio.token yk$ cleos push action yekai create '{"issuer":"yekai", "maximum_supply": "1000000000.0000 YKC", "can_freeze": 1, "can_recall": 1, "can_whitelist": 1}' -p yekai@active

executed transaction: 60aba3068a0e3afebd81d23c3a5b954321eb1d29926a46199c7168590f3cf1fa 248 bytes 104448 cycles

# yekai <= yekai::create {"issuer":"yekai","maximum_supply":"1000000000.0000 YKC","can_freeze":1,"can_recall":1,"can_whitelis...

这样执行成功，我们就可以发币了

yekaideMacBook-Pro:eosio.token yk$ cleos push action yekai issue '{"to":"yekai","quantity":"1000.0000 YKC","memo":"issue first"}' -p yekai@active

executed transaction: fd0079f68e354e70a2c6af53d091531064681a256fbe807292bb11b20dcc408d 264 bytes 109568 cycles

# yekai <= yekai::issue {"to":"yekai","quantity":"1000.0000 YKC","memo":"issue first"}

>> issue

可以查看yekai当前的余额，两个yekai一个代表合约，一个代表范围，accounts代表表名，accounts在哪定义的？

yekaideMacBook-Pro:eosio.token yk$ cleos get table yekai yekai accounts

{

"rows": [{

"balance": "1000.0000 YKC",

"frozen": 0,

"whitelist": 1

}

],

"more": false

}

转账给dinglinlin，先创建一个账户dinglinlin

yekaideMacBook-Pro:eosio.token yk$ cleos create key

Private key: 5JibbdFPc4f5ZX9Qq8sWpX8yACNwAzex5ogHWxtTGVSYeUkvWJq

Public key: EOS5vn5Jj5oU1zP7rKDwbXsEjLbQnT8yvLF1PcyCEFKzoAX3xVz2J

yekaideMacBook-Pro:eosio.token yk$ cleos create account eosio dinglinlin EOS5vn5Jj5oU1zP7rKDwbXsEjLbQnT8yvLF1PcyCEFKzoAX3xVz2J EOS5vn5Jj5oU1zP7rKDwbXsEjLbQnT8yvLF1PcyCEFKzoAX3xVz2J

executed transaction: d710f137d34568981eb0bd65fbf4e7306cc813e47b067d06138af9eea15b352a 352 bytes 102400 cycles

# eosio <= eosio::newaccount {"creator":"eosio","name":"dinglinlin","owner":{"threshold":1,"keys":[{"key":"EOS5vn5Jj5oU1zP7rKDwbX...

yekaideMacBook-Pro:eosio.token yk$

yekaideMacBook-Pro:eosio.token yk$ cleos wallet import 5JibbdFPc4f5ZX9Qq8sWpX8yACNwAzex5ogHWxtTGVSYeUkvWJq

imported private key for: EOS5vn5Jj5oU1zP7rKDwbXsEjLbQnT8yvLF1PcyCEFKzoAX3xVz2J

转账给dinglinlin

yekaideMacBook-Pro:eosio.token yk$ cleos push action yekai transfer '{"from":"yekai","to":"dinglinlin","quantity":"20.0000 YKC","memo":"my first transfer"}' -p yekai@active

executed transaction: ae530eaab3c7b2dbecb73df0dc7d74c5861ff1d0cc50655f2f31d46004e4187d 272 bytes 112640 cycles

# yekai <= yekai::transfer {"from":"yekai","to":"dinglinlin","quantity":"20.0000 YKC","memo":"my first transfer"}

>> transfer

# dinglinlin <= yekai::transfer {"from":"yekai","to":"dinglinlin","quantity":"20.0000 YKC","memo":"my first transfer"}

再次查看余额，叶开和丁琳琳金额发生了变化！

yekaideMacBook-Pro:eosio.token yk$ cleos get table yekai dinglinlin accounts

{

"rows": [{

"balance": "20.0000 YKC",

"frozen": 0,

"whitelist": 1

}

],

"more": false

}

yekaideMacBook-Pro:eosio.token yk$ cleos get table yekai yekai accounts

{

"rows": [{

"balance": "980.0000 YKC",

"frozen": 0,

"whitelist": 1

}

],

"more": false

}

abi文件三要素

发币已然成功，然而少了点什么，我们再回过来介绍abi文件的内容。abi文件有三要素，当然不是阳光、空气和水！abi文件的三要素是struct，action，table。

yekaideMacBook-Pro:eosio.token yk$ cat eosio.token.abi

{

"types": [],

"structs": [{

"name": "transfer",

"base": "",

"fields": [

{"name":"from", "type":"account_name"},

{"name":"to", "type":"account_name"},

{"name":"quantity", "type":"asset"},

{"name":"memo", "type":"string"}

]

},{

"name": "create",

"base": "",

"fields": [

{"name":"issuer", "type":"account_name"},

{"name":"maximum_supply", "type":"asset"},

{"name":"can_freeze", "type":"uint8"},

{"name":"can_recall", "type":"uint8"},

{"name":"can_whitelist", "type":"uint8"}

]

},{

"name": "issue",

"base": "",

"fields": [

{"name":"to", "type":"account_name"},

{"name":"quantity", "type":"asset"},

{"name":"memo", "type":"string"}

]

},{

"name": "account",

"base": "",

"fields": [

{"name":"balance", "type":"asset"},

{"name":"frozen", "type":"uint8"},

{"name":"whitelist", "type":"uint8"}

]

},{

"name": "currency_stats",

"base": "",

"fields": [

{"name":"supply", "type":"asset"},

{"name":"max_supply", "type":"asset"},

{"name":"issuer", "type":"account_name"},

{"name":"can_freeze", "type":"uint8"},

{"name":"can_recall", "type":"uint8"},

{"name":"can_whitelist", "type":"uint8"},

{"name":"is_frozen", "type":"uint8"},

{"name":"enforce_whitelist", "type":"uint8"}

]

}

],

"actions": [{

"name": "transfer",

"type": "transfer",

"ricardian_contract": ""

},{

"name": "issue",

"type": "issue",

"ricardian_contract": ""

}, {

"name": "create",

"type": "create",

"ricardian_contract": ""

}

],

"tables": [{

"name": "accounts",

"type": "account",

"index_type": "i64",

"key_names" : ["currency"],

"key_types" : ["uint64"]

},{

"name": "stat",

"type": "currency_stats",

"index_type": "i64",

"key_names" : ["currency"],

"key_types" : ["uint64"]

}

],

"ricardian_clauses": []

}

struct 结构

struct不会碰到太多问题，就是我们定义的结构体

action 动作

action是abi文件的灵魂，eos是以action驱动，当然锝得得action。

table

table其实是非必须的，比如hello的例子中就没有table，table做什么用呢？既然是table，就可以当成数据库的table，那么什么用处也就清晰了！本例使用table存储每个用户的持币余额！说到这里，也就能理解之前的操作为什么用accounts这个表了！

修改示例代码重新得到abi

很遗憾的是官方给的示例代码是无法通过eosiocpp生成官方版的abi文件的，咱们做一下跳坑练习！

yekaideMacBook-Pro:eosio.token yk$ eosiocpp -g eosio.token.abi eosio.token.cpp

yekaideMacBook-Pro:eosio.token yk$ cat eosio.token.abi

{

"____comment": "This file was generated by eosio-abigen. DO NOT EDIT - 2018-05-11T06:32:03",

"types": [],

"structs": [],

"actions": [],

"tables": [],

"ricardian_clauses": []

}

很郁闷的发现abi的文件空空如也，整个人都不好了！接下来就看动手能力了，我们先将hpp和cpp源码改造一下，将namespace的使用方式去掉，经过证明，我们需要使用全局空间，不能再次定义eosio这个命名空间！

代码改造如下（第一次修改）

eosio.token.hpp

/**

* @file

* @copyright defined in eos/LICENSE.txt

*/

#pragma once

#include#include#includenamespace eosiosystem { class system_contract;}using namespace eosio ; using std::string; class token : public contract { public: token( account_name self ):contract(self){} /// @abi action void create( account_name issuer, asset maximum_supply, uint8_t issuer_can_freeze, uint8_t issuer_can_recall, uint8_t issuer_can_whitelist ); void issue( account_name to, asset quantity, string memo ); void transfer( account_name from, account_name to, asset quantity, string memo ); private: friend eosiosystem::system_contract; inline asset get_supply( symbol_name sym )const; inline asset get_balance( account_name owner, symbol_name sym )const; private: struct account { asset balance; bool frozen = false; bool whitelist = true; uint64_t primary_key()const { return balance.symbol.name(); } }; struct currency_stats { asset supply; asset max_supply; account_name issuer; bool can_freeze = true; bool can_recall = true; bool can_whitelist = true; bool is_frozen = false; bool enforce_whitelist = false; uint64_t primary_key()const { return supply.symbol.name(); } }; typedef eosio::multi_indexaccounts; typedef eosio::multi_index stats;

void sub_balance( account_name owner, asset value, const currency_stats& st );

void add_balance( account_name owner, asset value, const currency_stats& st,

account_name ram_payer );

public:

struct transfer_args {

account_name from;

account_name to;

asset quantity;

string memo;

};

};

asset token::get_supply( symbol_name sym )const

{

stats statstable( _self, sym );

const auto& st = statstable.get( sym );

return st.supply;

}

asset token::get_balance( account_name owner, symbol_name sym )const

{

accounts accountstable( _self, owner );

const auto& ac = accountstable.get( sym );

return ac.balance;

}

eosio.token.cpp

/**

* @file

* @copyright defined in eos/LICENSE.txt

*/

#include "eosio.token.hpp"

void token::create( account_name issuer,

asset maximum_supply,

uint8_t issuer_can_freeze,

uint8_t issuer_can_recall,

uint8_t issuer_can_whitelist )

{

require_auth( _self );

auto sym = maximum_supply.symbol;

eosio_assert( sym.is_valid(), "invalid symbol name" );

eosio_assert( maximum_supply.is_valid(), "invalid supply");

eosio_assert( maximum_supply.amount > 0, "max-supply must be positive");

stats statstable( _self, sym.name() );

auto existing = statstable.find( sym.name() );

eosio_assert( existing == statstable.end(), "token with symbol already exists" );

statstable.emplace( _self, [&]( auto& s ) {

s.supply.symbol = maximum_supply.symbol;

s.max_supply = maximum_supply;

s.issuer = issuer;

s.can_freeze = issuer_can_freeze;

s.can_recall = issuer_can_recall;

s.can_whitelist = issuer_can_whitelist;

});

}

void token::issue( account_name to, asset quantity, string memo )

{

print( "issue" );

auto sym = quantity.symbol.name();

stats statstable( _self, sym );

const auto& st = statstable.get( sym );

require_auth( st.issuer );

eosio_assert( quantity.is_valid(), "invalid quantity" );

eosio_assert( quantity.amount > 0, "must issue positive quantity" );

eosio_assert( quantity <= st.max_supply - st.supply, "quantity exceeds available supply");

statstable.modify( st, 0, [&]( auto& s ) {

s.supply += quantity;

});

add_balance( st.issuer, quantity, st, st.issuer );

if( to != st.issuer )

{

SEND_INLINE_ACTION( *this, transfer, {st.issuer,N(active)}, {st.issuer, to, quantity, memo} );

}

}

void token::transfer( account_name from,

account_name to,

asset quantity,

string /*memo*/ )

{

print( "transfer" );

require_auth( from );

auto sym = quantity.symbol.name();

stats statstable( _self, sym );

const auto& st = statstable.get( sym );

require_recipient( from );

require_recipient( to );

eosio_assert( quantity.is_valid(), "invalid quantity" );

eosio_assert( quantity.amount > 0, "must transfer positive quantity" );

sub_balance( from, quantity, st );

add_balance( to, quantity, st, from );

}

void token::sub_balance( account_name owner, asset value, const currency_stats& st ) {

accounts from_acnts( _self, owner );

const auto& from = from_acnts.get( value.symbol.name() );

eosio_assert( from.balance.amount >= value.amount, "overdrawn balance" );

if( has_auth( owner ) ) {

eosio_assert( !st.can_freeze || !from.frozen, "account is frozen by issuer" );

eosio_assert( !st.can_freeze || !st.is_frozen, "all transfers are frozen by issuer" );

eosio_assert( !st.enforce_whitelist || from.whitelist, "account is not white listed" );

} else if( has_auth( st.issuer ) ) {

eosio_assert( st.can_recall, "issuer may not recall token" );

} else {

eosio_assert( false, "insufficient authority" );

}

from_acnts.modify( from, owner, [&]( auto& a ) {

a.balance -= value;

});

}

void token::add_balance( account_name owner, asset value, const currency_stats& st, account_name ram_payer )

{

accounts to_acnts( _self, owner );

auto to = to_acnts.find( value.symbol.name() );

if( to == to_acnts.end() ) {

eosio_assert( !st.enforce_whitelist, "can only transfer to white listed accounts" );

to_acnts.emplace( ram_payer, [&]( auto& a ){

a.balance = value;

});

} else {

eosio_assert( !st.enforce_whitelist || to->whitelist, "receiver requires whitelist by issuer" );

to_acnts.modify( to, 0, [&]( auto& a ) {

a.balance += value;

});

}

}

EOSIO_ABI( token, (create)(issue)(transfer) )

这次abi文件有变化了，但是好像还缺少点什么!

{

"____comment": "This file was generated by eosio-abigen. DO NOT EDIT - 2018-05-11T06:41:35",

"types": [],

"structs": [{

"name": "create",

"base": "",

"fields": [{

"name": "issuer",

"type": "account_name"

},{

"name": "maximum_supply",

"type": "asset"

},{

"name": "issuer_can_freeze",

"type": "uint8"

},{

"name": "issuer_can_recall",

"type": "uint8"

},{

"name": "issuer_can_whitelist",

"type": "uint8"

}

]

},{

"name": "issue",

"base": "",

"fields": [{

"name": "to",

"type": "account_name"

},{

"name": "quantity",

"type": "asset"

},{

"name": "memo",

"type": "string"

}

]

},{

"name": "transfer",

"base": "",

"fields": [{

"name": "from",

"type": "account_name"

},{

"name": "to",

"type": "account_name"

},{

"name": "quantity",

"type": "asset"

},{

"name": "memo",

"type": "string"

}

]

}

],

"actions": [{

"name": "create",

"type": "create",

"ricardian_contract": ""

},{

"name": "issue",

"type": "issue",

"ricardian_contract": ""

},{

"name": "transfer",

"type": "transfer",

"ricardian_contract": ""

}

],

"tables": [],

"ricardian_clauses": []

}

上面看似abi文件没有问题了，但实际上tables部分，也就是abi的三要素少了一个tables，这样数据是存储不下来的，发币会有问题！

关键点，添加注释

再次编译，结果更多的错误！不要慌！

abi_generation_exception: Unable to generate abi

false: types can only be: vector, struct, class or a built-in type. (bool)

{"type":"bool"}

thread-0 abi_generator.cpp:606 add_type

{}

thread-0 abi_generator.cpp:290 handle_decl

在eos的智能合约里，导出的table数据中不可以有bool类型，其实提示的已经较为明显了，另外就是加那行注释是有实际作用的，eosiocpp会做正则匹配，然后才会导出table信息到abi。

/**

* @file

* @copyright defined in eos/LICENSE.txt

*/

#pragma once

#include

#include

#include

namespace eosiosystem {

class system_contract;

}

using namespace eosio ;

using std::string;

class token : public contract {

public:

token( account_name self ):contract(self){}

/// @abi action

void create( account_name issuer,

asset maximum_supply,

uint8_t issuer_can_freeze,

uint8_t issuer_can_recall,

uint8_t issuer_can_whitelist );

void issue( account_name to, asset quantity, string memo );

void transfer( account_name from,

account_name to,

asset quantity,

string memo );

private:

friend eosiosystem::system_contract;

inline asset get_supply( symbol_name sym )const;

inline asset get_balance( account_name owner, symbol_name sym )const;

private:

/// @abi table accounts i64

struct account {

asset balance;

uint8_t frozen = 0;

uint8_t whitelist = 1;

uint64_t primary_key()const { return balance.symbol.name(); }

};

/// @abi table stats i64

struct stat {

asset supply;

asset max_supply;

account_name issuer;

uint8_t can_freeze = 1;

uint8_t can_recall = 1;

uint8_t can_whitelist = 1;

uint8_t is_frozen = 0;

uint8_t enforce_whitelist = 0;

uint64_t primary_key()const { return supply.symbol.name(); }

};

typedef eosio::multi_index accounts;

typedef eosio::multi_index stats;

void sub_balance( account_name owner, asset value, const stat& st );

void add_balance( account_name owner, asset value, const stat& st,

account_name ram_payer );

public:

struct transfer_args {

account_name from;

account_name to;

asset quantity;

string memo;

};

};

asset token::get_supply( symbol_name sym )const

{

stats statstable( _self, sym );

const auto& st = statstable.get( sym );

return st.supply;

}

asset token::get_balance( account_name owner, symbol_name sym )const

{

accounts accountstable( _self, owner );

const auto& ac = accountstable.get( sym );

return ac.balance;

}

注意一下修改变化，account和stat结构体前都加了注释，另外导出时对table的name长度有限制，所以去掉了currency_和后面的s，当然相应的函数调用部分都要调整。别忘了同步修改cpp文件对应的函数接口部分，这样基本可以大公告成了！

再次发币

先部署合约

cleos set contract yekai ../eosio.token

给linlin妹子再来点币

yk$ cleos push action yekai transfer '{"from":"yekai","to":"dinglinlin","quantity":"66.0000 YKC","memo":"my sencond transfer"}' -p yekai@active

executed transaction: 08f6f04ee43e51423e84379080e1788461fc6b36bdbbf58c3a1fe518e2140e90 280 bytes 112640 cycles

# yekai <= yekai::transfer {"from":"yekai","to":"dinglinlin","quantity":"66.0000 YKC","memo":"my sencond transfer"}

>> transfer

# dinglinlin <= yekai::transfer {"from":"yekai","to":"dinglinlin","quantity":"66.0000 YKC","memo":"my sencond transfer"}

再次分别查看余额

yekaideMacBook-Pro:eosio.token yk$ cleos get table yekai yekai accounts

{

"rows": [{

"balance": "914.0000 YKC",

"frozen": 0,

"whitelist": 1

}

],

"more": false

}

yekaideMacBook-Pro:eosio.token yk$ cleos get table yekai dinglinlin accounts

{

"rows": [{

"balance": "86.0000 YKC",

"frozen": 0,

"whitelist": 1

}

],

"more": false

}

总结

本篇主要介绍如何发币，如何编译智能合约代码，以及智能合约编写时碰到的问题，把遇到的坑总结如下：

/// @abi 有特殊作用

类型必须使用内建类型，或者结构体，类，vector等

table结构体长度是有限制的，不能太长，这也需要注意

table指定主键有时也需要自己指定，例如：/// @abi table tablename i64

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