從合約地址獲取資訊？

pragma solidity ^0.5.0;
import 'https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/SafeMath.sol';

contract SubToken{
   using SafeMath for uint;

   struct token{ 
       string  name; 
       string   symbol; 
       uint8  decimals; 
       uint  totalSupply;  
   }

   token public mytokens;

   mapping(address => token) Tokens;
   mapping(address => uint) balances;

   constructor(string memory _name,string memory _symbol,uint8 _decimals,uint256 _totalSupply)  public{  
       mytokens = token(_name,_symbol,_decimals,_totalSupply);
       balances[msg.sender]=_totalSupply;  
   }

   function getInformations(address contract_address) public view returns(string memory name,string memory symbol,uint8 decimals,uint totalSupply){
       return (Tokens[contract_address].name,Tokens[contract_address].symbol,Tokens[contract_address].decimals,Tokens[contract_address].totalSupply);
   }

   //function transferFrom(address from, address to, uint tokens) public returns (bool success);
   //function allowance(address tokenOwner, address spender) public view returns (uint remaining); 
   //function transfer(address to, uint tokens) public returns (bool success) ; 
   //function approve(address spender, uint tokens) public returns (bool success); 
   //function transferFrom(address from, address to, uint tokens) public returns (bool success); 

   event Transfer(address indexed from, address indexed to, uint tokens);
   event Approval(address indexed tokenOwner, address indexed spender, uint tokens);

}
contract MainContract {
   mapping(address => mapping(address=>uint)) balances;

   mapping(address => mapping(address => uint)) allowed;

   address[] public contracts;

   using SafeMath for uint;

   address contract_address;

   struct token{ 
       string  name; 
       string   symbol; 
       uint8  decimals; 
       uint  totalSupply;  
   } 
   mapping(address => token) public tokens;

   function createNewContract(string memory _name,string memory _symbol,uint8 _decimals,uint256 _totalSupply) public returns(address youraddress){ 
       SubToken st = new SubToken(_name,_symbol,_decimals,_totalSupply);
       tokens[address(st)] = token(_name,_symbol,_decimals,_totalSupply);
       return(address(st));
   } 


   event Transfer(address indexed _from, address indexed _to, uint256 _value);
   event Approval(address indexed _owner, address indexed _spender, uint256 _value);

}

嘿伙計們，我是一個堅固的初學者，所以我的問題是關於聯繫地址並獲取一些資訊。

所以我有 2 份契約，第一份是次要的，第二份是主要的。在我的主契約中，我為創建子契約創建了契約功能，並且效果很好。

但在我的分包契約中，我有獲取資訊的功能。這個函式接受一個合約地址參數並返回資訊。那裡的問題這個功能不起作用。

我檢查了我的程式碼，但我不應該做什麼

任何人都可以幫助我:)

當您從 中創建 aSubToken時MainContract，SubToken建構子不會將新創建的令牌添加到SubTokenTokens 映射中，而在getInformations.

您的工廠 (MainContract) 和令牌 (SubToken) 都有令牌映射。

我不知道您對在這兩個地方擷取這些數據的要求。我會懷疑這僅在 MainContract 中需要。

創建 ERC20 代幣的工廠（使用 OpenZeppelin ERC20 實現）可能如下所示：

pragma solidity ^0.5.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.3.0/contracts/token/ERC20/ERC20.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.3.0/contracts/token/ERC20/ERC20Detailed.sol";


contract Token is ERC20, ERC20Detailed {

   constructor (string memory name, string memory symbol, uint8 decimals, uint256 totalSupply) 
       public 
       ERC20Detailed(name, symbol, decimals) 
   {
       _mint(msg.sender, totalSupply);
   }
}

contract Factory {
   struct tokenData { 
       string name; 
       string symbol; 
       uint8 decimals; 
       uint256 totalSupply;  
   } 

   event TokenCreated(address indexed tokenAddress, string name, string symbol, uint8 decimals, uint256 totalSupply);

   mapping(address => tokenData) private _tokens;

   function createToken(string memory name, string memory symbol, uint8 decimals, uint256 totalSupply) public returns(address tokenAddress){ 
       Token token = new Token(name, symbol, decimals, totalSupply);
       _tokens[address(token)] = tokenData(name, symbol, decimals, totalSupply);

       emit TokenCreated(address(token), name, symbol, decimals, totalSupply);

       return(address(token));
   } 

   function getTokenData(address tokenAddress) public view returns(string memory name, string memory symbol, uint8 decimals, uint256 totalSupply){
       return (_tokens[tokenAddress].name, _tokens[tokenAddress].symbol, _tokens[tokenAddress].decimals, _tokens[tokenAddress].totalSupply);
   }
}

如果您正在創建 ERC20 代幣，您可能需要查看 OpenZeppelin Contracts 實現，看看這是否滿足您的需求。

有關詳細資訊，請參閱文件：https ://docs.openzeppelin.com/contracts/2.x/tokens#ERC20

如果您對使用 OpenZeppelin 有任何疑問，可以在社區論壇中提問：https ://forum.openzeppelin.com/

披露：我是 OpenZeppelin 的社區經理

引用自：https://ethereum.stackexchange.com/questions/73653