COMPUTER PROJECT DESIGN

tags: GETH

• Source Code
• Hackmd
• System Documentation

---

Project Folder Structure

• contracts
  • CrowdFunding.sol
  • HelloWorld.sol
  • MatchMaker.sol
• utils
  • gensis.json
  • mineWhenNeeded.js
  • addDefaultAccount_in_Gensis.js
• call_CrowdFunding.js
• call_HelloWorld.js
• call_MatchMaker.js
• deploy_contract.js
• package.json
• geth_firstRun .sh
• geth_start .sh

Environment

• Node js

• Geth： Ubuntu ， Mac

    # On Ubuntu
    sudo apt-get update
    sudo apt-get install ethereum
    
    # On Mac
    brew tap ethereum/ethereum
    brew install ethereum
  

Building

1. 初始化區塊鏈環境

    ./geth_firstRun.sh
   

2. 安裝相關套件

    sudo npm install
   

Usage

1. 執行區塊鏈server

    ./geth_start.sh
   

2. 開啟另一個terminal並部署合約上去

    node deploy_contract.js
   

3. 複製顯示的地址到call_HelloWorld.js的第9行

4. 呼叫合約

    node call_HelloWorld.js
   

Handle Error Msg

• ERROR: Invalid Address

  Solution

• Invalid asm.js: Invalid member of stdlib

  Solution: Add "--no-warnings" while using node node --no-warnings deploy_contract.js

• Error: invalid argument 0: json: cannot unmarshal hex string of odd length into Go value of type hexutil.Bytes

  Solution: 合約有寫錯

• BigNumber Error: new BigNumber() not a base 16 number

  Solution: 合約的Construct寫錯

Reference

1. https://ethereum.stackexchange.com/questions/729/how-to-concatenate-strings-in-solidity
2. https://stackoverflow.com/questions/54499116/how-do-you-compare-strings-in-solidity
3. https://ethereum.stackexchange.com/questions/63515/how-to-access-string-arguments-from-calldata-in-external-functions-0-5-x
4. https://ethereum.stackexchange.com/questions/45972/ive-got-an-error-while-compiling-use-constructor-instead