智能合约开发之简易球星卡交易系统

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个人自制编写了一个简易球星卡智能合约，暂不包括前端后端

此合约是在以太坊上部署一个集卡类游戏，玩家可以购买卡片获得自己喜爱的稀有的球星卡，玩家也可以在交易所卖出或者买入自己中意的卡片。

功能包括:

• getplayer 查看当前用户拥有的卡片
• getStarcard 查看指定卡片向合约购买的价格(ether)
• getCreatesale 查看制定交易下标返回详细数值

• getallCrea 返回当前所有的交易

• Starcardbuy 输入指定卡片号码与转账ether向合约购买卡片

• Createsale 输入指定卡片号码与指定数额创建一个交易
• Starcardbuytran 输入指定交易下标与转账ether竞拍交易
• open 输入指定下标，交易发起者可调用此合约结束竞拍，最高者获得指定卡片

代码如下：

pragma solidity ^0.4.20;

contract Starcard {
    address Boss;
    uint[20] StarID;
    uint[20] cardID;
    mapping (address => uint[20]) balances;
    struct tran{
        address Seller;
        uint8 ofcard;
        uint price;
        uint auction;
        uint time;
        address HighestBidder;
        uint HighestPrice;
        bool status1;
    }
     tran[] Tran;
    function Starcard() public{
        Boss = msg.sender;
        for(uint8 i=0;i<20;i++){
            StarID[i]=20-i;
        }
    }
    function getStarcard(uint i) public view returns(uint,bool){
        if(i<20){
            return (StarID[i],true);
        }
        else
            return (0,false);
    }
    function Starcardbuy(uint i)payable public returns(uint[20],bool){
        if(StarID[i]==msg.value/(10**18)){
           cardID=balances[msg.sender];
           cardID[i] = cardID[i]+1;
           balances[msg.sender] = cardID;
           return(balances[msg.sender],true);
        }
        else{
            msg.sender.transfer(msg.value);
            return(balances[msg.sender],false);
        }
    }
    function getplayer() public view returns(uint[20]){
        return balances[msg.sender];
    }
    function Createsale(uint8 thecard,uint theprice) public returns(uint,bool){
        cardID = balances[msg.sender];
        tran memory tra;
        if(cardID[thecard] != 0){
            tra.Seller = msg.sender;
            tra.ofcard = thecard;
            tra.price = theprice;
            tra.auction = tra.price*6/10;
            tra.status1 = true;
            tra.time = block.number;
            Tran.push(tra);
            cardID[thecard] = cardID[thecard]-1;
            balances[msg.sender] = cardID;
            return (Tran.length-1,true);
        }
        else
            return (0,false);

本文标签： 合约球星简易交易系统智能