【合约外部调用】solidity语言是一个合约调用另外一个合约【同一个区块链网络】的方法【使用接口声明关系】

川长思鸟来 2021-09-18 16:24 286阅读 0赞

solidity官方时间库：[https://github.com/pipermerriam/ethereum-datetime][https_github.com_pipermerriam_ethereum-datetime]

### **![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzM0MzE0NA_size_16_color_FFFFFF_t_70][]** ###

### **一个如何调用主网智能合约的方法案例！（此案例用Rinkeby测试网络部署）** ###

### **这里接口的作用：只是用来声明需要调用的方法！** ###

一个如何调用主网智能合约的方法案例！
    
    
    pragma solidity >=0.5.0 <0.7.0;
    
    interface DateTime {
        function getDay(uint timestamp) view external returns (uint16);
    }
    
    contract Collection {
        // 必须把当前合约部署的网络和0x92482Ba45A4D2186DafB486b322C6d0B88410FE7同一个网络
        DateTime time = DateTime(0x92482Ba45A4D2186DafB486b322C6d0B88410FE7);
        uint target = 100 ether;
        uint percentage = 1;
        uint16 private datatime;
    
        constructor() public {
    
        }
    
        function() external payable{
            // 这里实现代币自动兑换
        }
        
        function test_time() public view returns(uint16){
            return time.getDay(1554710705);
        }
    }

**参考别人的分析：[https://blog.csdn.net/lj900911/article/details/83037691][https_blog.csdn.net_lj900911_article_details_83037691]**

**![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzM0MzE0NA_size_16_color_FFFFFF_t_70 1][]**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzM0MzE0NA_size_16_color_FFFFFF_t_70 2][]

interface Token {
        // 普通转账(禁止冻结账号交易))
        function transfer(address to, uint256 value) external returns (bool);
        function balanceOf(address owner) external view returns (uint256);
    }
    
    contract Collection {
        using UintEther for uint;
        address private admin_account;
        Token private token;
        uint private target;
        uint private percentage;
        
        event SendToken(address sender,uint value);
    
        constructor(address token_contract) public {
            admin_account = msg.sender;
            target = 10 ether;
            percentage = 1;
            token = Token(token_contract);
        }
    }

[https_github.com_pipermerriam_ethereum-datetime]: https://github.com/pipermerriam/ethereum-datetime
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzM0MzE0NA_size_16_color_FFFFFF_t_70]: /images/20210812/71dfeab1407e4f308715135f95ea11b5.png
[https_blog.csdn.net_lj900911_article_details_83037691]: https://blog.csdn.net/lj900911/article/details/83037691
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzM0MzE0NA_size_16_color_FFFFFF_t_70 1]: /images/20210812/cc3687688f1f4efdbe0a8a061bec5bbe.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzM0MzE0NA_size_16_color_FFFFFF_t_70 2]: /images/20210812/104d215ce9854b8e9a6f385b99c088d9.png