EOS 智能合约编写（一）

1 hello例子

#include

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))

编译

将代码编译为Web程序集（.wast）

eosiocpp -o hello.wast hello.cpp
生成abi：

eosiocpp -g hello.abi hello.cpp

创建一个账户并上传合同：

cleos set contract myaccount ../hello -p myaccount

运行合同：

cleos push action myaccount hi '["user"]' -p myaccount

查看某个账户数据存储 table

cleos get table myaccount class test

参数介绍：

Create or update the contract on an account

Usage: cleos set contract[OPTIONS]account contract-dir[wast-file][abi-file]

Positionals:

  account TEXT                The account to publish a contract for(required)

  contract-dir TEXT          The path containing the .wast and .abi(required)

  wast-file TEXT              The file containing the contract WAST or WASM relative to contract-dir

  abi-file TEXT              The ABI for the contract relative to contract-dir

Options:

  -h,--help                  Print this help message and exit

  -a,--abi TEXT              The ABI for the contract relative to contract-dir

  -x,--expiration            set the time in seconds before a transaction expires,defaults to 30s

  -f,--force-unique          force the transaction to be unique. this will consume extra bandwidth and remove any protections against accidently issuing the same transaction multiple times

  -s,--skip-sign              Specify if unlocked wallet keys should be used to sign transaction

  -j,--json                  print result as json

  -d,--dont-broadcast        don't broadcast transaction to the network(just print to stdout)

  -r,--ref-block TEXT        set the reference block num or block id used for TAPOS(Transaction as Proof-of-Stake)

  -p,--permission TEXT ...    An account and permission level to authorize,as in 'account@permission'(defaults to 'account@active')

  --max-cpu-usage-ms UINT    set an upper limit on the milliseconds of cpu usage budget,for the execution of the transaction(defaults to 0 which means no limit)

  --max-net-usage UINT        set an upper limit on the net usage budget,in bytes,for the transaction(defaults to 0 which means no limit)