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HelloWorld on ontology

Version 1.0.0

本文将演示在testmode下，部署一本helloWorld合约，并做执行。

1. 下载ontology并使用ontology创建一个默认账户

如果是linux, mac, 可以通过 curl https://dev.ont.io/ontology_install | sh 下载, 否则可以在这里下载

创建账户： ./ontology account add -d
Use default setting ‘-t ecdsa -b 256 -s SHA256withECDSA’ signature algorithm: ecdsa curve: P-256 signature scheme: SHA256withECDSA Password: Re-enter Password:

Index: 1
Label:
Address: your address
Public key: your public key
Signature scheme: SHA256withECDSA

Create account successfully.

2. 启动testmode

使用命令./ontology --testmode --rest启动，启动之后大概是这样的

    λ ./ontology --testmode --rest
    2018/07/20 15:46:42.918576 [INFO ] GID 1, Config init success
    Password:
    2018/07/20 15:46:45.658436 [INFO ] GID 1, Using account:your public key
    2018/07/20 15:46:45.660443 [INFO ] GID 1, Account init success
    2018/07/20 15:46:46.050346 [INFO ] GID 1, deploy contract address:0239dcf9b4a46f15c5f23f20d52fac916a0bac0d
    2018/07/20 15:46:46.053336 [INFO ] GID 1, deploy contract address:08b6dcfed2aace9190a44ae34a320e42c04b46ac
    2018/07/20 15:46:46.054337 [INFO ] GID 1, deploy contract address:7a2f84e3b94d20da1a8592116c0103c28c5e457e
    2018/07/20 15:46:46.056331 [INFO ] GID 1, deploy contract address:6815cbe7b4dbad4d2d09ae035141b5254a002f79
    2018/07/20 15:46:46.057327 [INFO ] GID 1, deploy contract address:24a15c6aed092dfaa711c4974caf1e9d307bf4b5
    2018/07/20 15:46:46.058325 [INFO ] GID 1, deploy contract address:4d6934f0a524a084bb20cff4cdbea236760bb4a3
    2018/07/20 15:46:46.165447 [INFO ] GID 1, GenesisBlock init success. GenesisBlock hash:00a3691ce01ba51962fd18c770ecb7c7400adf323d59f1190867b4e16f51d7e3

    2018/07/20 15:46:46.167440 [INFO ] GID 1, Ledger init success
    2018/07/20 15:46:46.168464 [INFO ] GID 1, tx pool: the current local gas price is 0

3.通过smartx开发HelloWorld 合约

  1. 打开smartx，按照HelloWorld示例编写一个Hello World智能合约，可以直接使用template代码，然后编译成AVM字节码， 将AVM字节码下载下来，命名为hello.avm：

    说明：Hello方法中，Runtime.Notify将传入的参数在链上做一个通知。

4.部署合约

使用命令./ontology contract deploy --code hello.avm --name 'Hello' --version '1.0' --author 'ester' --email 'tester@test.com' --desc 'helloWorld' --account 1 --gaslimit 100000000将 合约部署到网络上，部署合约命令的详细信息可以使用./ontology contract deploy -h获取；

```
Deploy contract:
  Contract Address:362cb5608b3eca61d4846591ebb49688900fedd0
  TxHash:c49865b16009177ed4b06add97f7be1b0b1c246e4d4575c367e918da294d3287

Tip:
  Using './ontology info status c49865b16009177ed4b06add97f7be1b0b1c246e4d4575c367e918da294d3287' to query transaction status
``` ### 5.查询已部署合约信息 在浏览器中输入`http://localhost:20334/api/v1/contract/362cb5608b3eca61d4846591ebb49688900fedd0`，调用rest接口查询合约信息：

```
{"Action":"getcontract","Desc":"SUCCESS","Error":0,"Result":{"Code":"54c56b6c7...","NeedStorage":false,"Name":"Hello","CodeVersion":"1.0","Author":"ester","Email":
"tester@test.com","Description":"helloWorld"},"Version":"1.0.0"}
``` ### 6.调用合约方法 使用命令`./ontology contract invoke --address 362cb5608b3eca61d4846591ebb49688900fedd0 --params string:Hello,[string:tester] --gaslimit 200000`调用部署的合约：

```
Invoke:d0ed0f908896b4eb916584d461ca3e8b60b52c36 Params:["Hello",["tester"]]
Password:
  TxHash:2cc94de8c26fce3be233bef007ec3492043ffc304b79a02d9b612df96e950186

Tip:
  Using './ontology info status 2cc94de8c26fce3be233bef007ec3492043ffc304b79a02d9b612df96e950186' to query transaction status
```

>说明：`--params string:Hello,[string:tester]`指定调用合约传入的参数，这里传入了两个参数，分别是`string:Hello`和`[string:tester]`，这些参数即是传入到合约代码中Main函数执行的参数。

7.查询调用交易的事件

根据提示使用命令./ontology info status 2cc94de8c26fce3be233bef007ec3492043ffc304b79a02d9b612df96e950186查询交易情况：

```
Transaction states:
{
   "TxHash": "2cc94de8c26fce3be233bef007ec3492043ffc304b79a02d9b612df96e950186",
   "State": 1,
   "GasConsumed": 0,
   "Notify": [
      {
         "ContractAddress": "362cb5608b3eca61d4846591ebb49688900fedd0",
         "States": [
            "746573746572"
         ]
      }
   ]
}
```

返回的结果中，States即为调用合约通知的msg信息，返回的是一个十六进制字符串，使用编码转换器转化后，得到的结果正是tester，即我们在第四步中传入的第二个参数。