ethereum(以太坊)--集资(构造函数/映射)
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pragma solidity ^0.4.4; contract funder{ //0xca35b7d915458ef540ade6068dfe2f44e8fa733c //0x14723a09acff6d2a60dcdf7aa4aff308fddc160c :10 //0x583031d1113ad414f02576bd6afabfb302140225 :20 struct Funder{ address addr; uint amount; } struct Campaign{ address beneficiary; //受益人 uint fundingGoal; //集资目标 uint numFunders; //出资人数 uint mount; //已集资数 mapping(uint => Funder) Funders; //按照索引存储出资人信息 } uint numCampaigns; mapping(uint => Campaign) public Campaigns; //按照索引存储每个受益人的状态 //向指定受益人出资一定数量的钱 //function newCampaign(address beneficiary,uint goal) public returns(uint campaignID){ //function newCampaign(address beneficiary,uint goal) public{ //DeclarationError: Undeclared identifier__campaignID function newCampaign(address beneficiary,uint goal) public{ //var campaignID = numCampaigns++; //Campaigns[campaignID] = Campaign(beneficiary,goal,0,0); Campaigns[numCampaigns] = Campaign(beneficiary,goal,0,0); numCampaigns ++; } function contribute(uint campaignID) public payable{ Campaign storage c = Campaigns[campaignID]; //每个受益人的状态 c.Funders[c.numFunders++] = Funder({addr:msg.sender,amount:msg.value}); //Funder({addr:msg.sender,amount:msg.value}) 当前转账人的地址,和转账金额 //c.numFunders++ 统计向当前受益人转账的人数 // 0 => 转账地址 c.mount += msg.value; //当前受益人的总受益 c.beneficiary.transfer(msg.value);//向受益人的地址转入ethtereum } function checkGoalReached(uint campaignID) public constant returns(bool reached){ Campaign storage c = Campaigns[campaignID]; if(c.mount < c.fundingGoal){ return false; } return true; } }
遇到的问题:
1.受益人可以相同
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