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MyAdvancedToken.sol
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MyAdvancedToken.sol
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pragma solidity ^0.4.16;
import "./owned.sol";
import "./TokenERC20.sol";
contract MyAdvancedToken is owned, TokenERC20 {
// 设置卖出价格
uint256 public sellPrice;
// 设置买入价格
uint256 public buyPrice;
// 设置交易余额阈值
uint256 minBalanceForAccounts;
mapping (address => bool) public fronzenAccount;
event FrozenFunds(address target, bool frozen);
function MyAdvancedToken(
uint256 initalSupply,
string tokenName,
string tokenSymbol
) TokenERC20(initialSupply, tokenName, tokenSymbol) payable public {}
function _transfer(address _from, address _to, uint _value) interal {
require(_to != 0x0);
require(balanceOf[_from] >= _value);
require(_value > 0);
// 确保交易账户双方都没有被冻结
require(!frozenAccount[_from]);
require(!fronzenAccount[_to]);
// 如果用于的余额低于阈值不足以支付费用给矿工
// 则合约自动售出一部分代币来补充余额
if(msg.sender.balance < minBalanceForAccounts)
sell((minBalanceForAccounts - msg.sender.balance) / sellPrice);
// if(_to.balance < minBalanceForAccounts)
// _to.send(sell(minBalanceForAccounts - _to.balance) / sellPrice);
// 进行交易计算
balanceOf[_from] -= _value;
balanceOf[_to] += _value;
Transfer(_from, _to, _value);
}
// 代币增发
function mintToken(address target, uint256 mintedAmount) onlyOwner public {
balanceOf[target] += mintedAmount;
totalSupply += mintedAmount;
Transfer(0, this, mintedAmount);
Transfer(this, target, mintedAmount);
}
// 冻结账户
function freezeAccount(address target, bool freeze) onlyOwner public {
frozenAccount[target] = freeze;
FrozenFunds(target, freeze);
}
// 设置买入价格和卖出价格
function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner public {
sellPrice = newSellPrice;
buyPrice = newBuyPrice;
}
// 购买
function buy() payable public {
uint amount = msg.value / buyPrice;
_transfer(this, msg.sender, amount);
}
// 卖出
function sell(uint256 amount) public {
require(this.balance >= amount * sellPrice);
_transfer(msg.sender, this, amount);
msg.sender.transfer(amount * sellPrice);
}
// 设置交易阈值
function setMinBalance(uint minimumBalanceInFinney) onlyOwner {
minBalanceForAccounts = minBalanceForAccounts * 1 * finney;
}
}