小王同学 - 2018年2月

批量发币合约代码

pizi — Wed, 28 Feb 2018 14:10:00 +0800

```
pragma solidity ^0.4.18;
library SafeERC20 {
  function safeTransfer(ERC20Basic token, address to, uint256 value) internal {
    assert(token.transfer(to, value));
  }

function safeTransferFrom(ERC20 token, address from, address to, uint256 value) internal {
    assert(token.transferFrom(from, to, value));
  }

event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

/**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() public {
    owner = msg.sender;
  }

/**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

/**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}
contract HasWallet is Ownable {
    address public wallet;

function setWallet(address walletAddress) public onlyOwner {
        require(walletAddress != address(0));
        wallet = walletAddress;
    }

}
contract WalletUsage is HasWallet {

/**
      * 合约自己是否保留eth.
      */
    bool public keepEth;

/**
      * 为避免默认方法被占用，特别开指定方法接受以太坊
      */
    function depositEth() public payable {
    }

function withdrawEth2Wallet(uint256 weiAmount) public onlyOwner {
        require(wallet != address(0));
        require(weiAmount > 0);
        wallet.transfer(weiAmount);
    }

function setKeepEth(bool _keepEth) public onlyOwner {
        keepEth = _keepEth;
    }

}

contract PublicBatchTransfer is WalletUsage {
    using SafeERC20 for ERC20;

uint256 public fee;

function PublicBatchTransfer(address walletAddress,uint256 _fee){
        require(walletAddress != address(0));
        setWallet(walletAddress);
        setFee(_fee);
    }

function batchTransfer(address tokenAddress, address[] beneficiaries, uint256[] tokenAmount) payable public returns (bool) {
        require(msg.value >= fee);
        require(tokenAddress != address(0));
        require(beneficiaries.length > 0 && beneficiaries.length == tokenAmount.length);
        ERC20 ERC20Contract = ERC20(tokenAddress);
        for (uint256 i = 0; i < beneficiaries.length; i++) {
            ERC20Contract.safeTransferFrom(msg.sender, beneficiaries[i], tokenAmount[i]);
        }
        if (!keepEth) {
            wallet.transfer(msg.value);
        }

return true;
    }

function setFee(uint256 _fee) onlyOwner public {
        fee = _fee;
    }
}
```

投票合约代码

pizi — Mon, 26 Feb 2018 20:13:00 +0800

```
pragma solidity ^0.4.16;

interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; }

contract TokenERC20 {
    string public name;
    string public symbol;
    uint8 public decimals = 18;  // 18 是建议的默认值
    uint256 public totalSupply;

mapping (address => uint256) public balanceOf;  // 
    mapping (address => mapping (address => uint256)) public allowance;

event Transfer(address indexed from, address indexed to, uint256 value);

event Burn(address indexed from, uint256 value);

function TokenERC20(uint256 initialSupply, string tokenName, string tokenSymbol) public {
        totalSupply = initialSupply * 10 ** uint256(decimals);
        balanceOf[msg.sender] = totalSupply;
        name = tokenName;
        symbol = tokenSymbol;
    }

function _transfer(address _from, address _to, uint _value) internal {
        require(_to != 0x0);
        require(balanceOf[_from] >= _value);
        require(balanceOf[_to] + _value > balanceOf[_to]);
        uint previousBalances = balanceOf[_from] + balanceOf[_to];
        balanceOf[_from] -= _value;
        balanceOf[_to] += _value;
        Transfer(_from, _to, _value);
        assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
    }

function transfer(address _to, uint256 _value) public {
        _transfer(msg.sender, _to, _value);
    }

function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        require(_value <= allowance[_from][msg.sender]);     // Check allowance
        allowance[_from][msg.sender] -= _value;
        _transfer(_from, _to, _value);
        return true;
    }

function approve(address _spender, uint256 _value) public
        returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        return true;
    }

function approveAndCall(address _spender, uint256 _value, bytes _extraData) public returns (bool success) {
        tokenRecipient spender = tokenRecipient(_spender);
        if (approve(_spender, _value)) {
            spender.receiveApproval(msg.sender, _value, this, _extraData);
            return true;
        }
    }

function burn(uint256 _value) public returns (bool success) {
        require(balanceOf[msg.sender] >= _value);
        balanceOf[msg.sender] -= _value;
        totalSupply -= _value;
        Burn(msg.sender, _value);
        return true;
    }

function burnFrom(address _from, uint256 _value) public returns (bool success) {
        require(balanceOf[_from] >= _value);
        require(_value <= allowance[_from][msg.sender]);
        balanceOf[_from] -= _value;
        allowance[_from][msg.sender] -= _value;
        totalSupply -= _value;
        Burn(_from, _value);
        return true;
    }
}
```

Typecho 隐藏内容插件

pizi — Thu, 08 Feb 2018 14:47:00 +0800

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