qklbishe GO区块链 2020-10-17

script-ether2 – 脚本-ether2区块链毕设代写

区块链毕设代写本文提供国外最新区块链项目源码下载，包括solidity,eth,fabric等blockchain区块链,script-ether2 – 脚本-ether2区块链毕设代写是一篇很好的国外资料

script-ether2

pragma solidity ^0.4.26; contract Token { /// @return total amount of tokens function totalSupply() constant returns (uint256 supply) {} /// @param _owner The address from which the balance will be retrieved /// @return The balance function balanceOf(address _owner) constant returns (uint256 balance) {} /// @notice send _value token to _to from msg.sender /// @param _to The address of the recipient /// @param _value The amount of token to be transferred /// @return Whether the transfer was successful or not function transfer(address _to, uint256 _value) returns (bool success) {} /// @notice send _value token to _to from _from on the condition it is approved by _from /// @param _from The address of the sender /// @param _to The address of the recipient /// @param _value The amount of token to be transferred /// @return Whether the transfer was successful or not function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {} /// @notice msg.sender approves _addr to spend _value tokens /// @param _spender The address of the account able to transfer the tokens /// @param _value The amount of wei to be approved for transfer /// @return Whether the approval was successful or not function approve(address _spender, uint256 _value) returns (bool success) {} /// @param _owner The address of the account owning tokens /// @param _spender The address of the account able to transfer the tokens /// @return Amount of remaining tokens allowed to spent function allowance(address _owner, address _spender) constant returns (uint256 remaining) {} event Transfer(address indexed _from, address indexed _to, uint256 _value); event Approval(address indexed _owner, address indexed _spender, uint256 _value); } contract StandardToken is Token { function transfer(address _to, uint256 _value) returns (bool success) { //Default assumes totalSupply can’t be over max (2^256 – 1). //If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn’t wrap. //Replace the if with this one instead. //if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) { if (balances[msg.sender] >= _value && _value > 0) { balances[msg.sender] -= _value; balances[_to] += _value; Transfer(msg.sender, _to, _value); return true; } else { return false; } } function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { //same as above. Replace this line with the following if you want to protect against wrapping uints. //if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) { if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) { balances[_to] += _value; balances[_from] -= _value; allowed[_from][msg.sender] -= _value; Transfer(_from, _to, _value); return true; } else { return false; } } function balanceOf(address _owner) constant returns (uint256 balance) { return balances[_owner]; } function approve(address _spender, uint256 _value) returns (bool success) { allowed[msg.sender][_spender] = _value; Approval(msg.sender, _spender, _value); return true; } function allowance(address _owner, address _spender) constant returns (uint256 remaining) { return allowed[_owner][_spender]; } mapping (address => uint256) balances; mapping (address => mapping (address => uint256)) allowed; uint256 public totalSupply; } contract HashnodeTestCoin is StandardToken { // CHANGE THIS. Update the contract name. /* Public variables of the token / / NOTE: The following variables are OPTIONAL vanities. One does not have to include them. They allow one to customise the token contract & in no way influences the core functionality. Some wallets/interfaces might not even bother to look at this information. / string public name; // Token Name uint8 public decimals; // How many decimals to show. To be standard complicant keep it 18 string public symbol; // An identifier: eg SBX, XPR etc.. string public version = ‘H1.0’; uint256 public unitsOneEthCanBuy; // How many units of your coin can be bought by 1 ETH? uint256 public totalEthInWei; // WEI is the smallest unit of ETH (the equivalent of cent in USD or satoshi in BTC). We’ll store the total ETH raised via our ICO here. address public fundsWallet; // Where should the raised ETH go? // This is a constructor function // which means the following function name has to match the contract name declared above function HashnodeTestCoin() { balances[msg.sender] = 100000000000000000000000000; // Give the creator all initial tokens. This is set to 10000 for example. If you want your initial tokens to be X and your decimal is 5, set this value to X * 100000. (CHANGE THIS) totalSupply = 100000000000000000000000000; // Update total supply (10000 for example) (CHANGE THIS) name = “CRYPTOART”; // Set the name for display purposes (CHANGE THIS) decimals = 18; // Amount of decimals for display purposes (CHANGE THIS) symbol = “CART”; // Set the symbol for display purposes (CHANGE THIS) unitsOneEthCanBuy = 10000; // Set the price of your token for the ICO (CHANGE THIS) fundsWallet = msg.sender; // The owner of the contract gets ETH } function() payable{ totalEthInWei = totalEthInWei + msg.value; uint256 amount = msg.value * unitsOneEthCanBuy; require(balances[fundsWallet] >= amount); balances[fundsWallet] = balances[fundsWallet] – amount; balances[msg.sender] = balances[msg.sender] + amount; Transfer(fundsWallet, msg.sender, amount); // Broadcast a message to the blockchain //Transfer ether to fundsWallet fundsWallet.transfer(msg.value); } / Approves and then calls the receiving contract */ function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) { allowed[msg.sender][_spender] = _value; Approval(msg.sender, _spender, _value); //call the receiveApproval function on the contract you want to be notified. This crafts the function signature manually so one doesn’t have to include a contract in here just for this. //receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData) //it is assumed that when does this that the call should succeed, otherwise one would use vanilla approve instead. if(!_spender.call(bytes4(bytes32(sha3(“receiveApproval(address,uint256,address,bytes)”))), msg.sender, _value, this, _extraData)) { throw; } return true; } }

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Initial commit

script-ether2

pragma solidity^0.4.26；合同令牌{//@return total amount of tokens function totalSupply（）常量返回（uint256 supply）{}///@param_owner将从中检索余额的地址//@return The balancefunction balanceOf（address_owner）常量返回（uint256 balance）{}///@notice send_value Token to _tofrom消息发送者/// @param_to The address of The recipient///@param_value要传输的令牌量///@return函数传输是否成功（address_to，uint256_value）返回（bool success）{}//@notice send_value token to _tofrom _from，条件是_from///@param_from发送方//@param_to the address of the recipient///@param_value要传输的令牌量//@返回传输是否成功函数transferFrom（address_from，address_to，uint256_value）返回（bool success）{}//@notice消息发送者批准u addr花费u value tokens//@paramu spender能够转移代币的账户地址//@param_value要批准转移的wei金额//@return无论批准是否成功，函数approve（addressu spender，uint256_value）返回（bool success）{}///@param_owner拥有令牌的帐户的地址//@param_spender能够转移令牌的帐户的地址//@return允许花费的函数允许的剩余令牌数量（addressu owner，address_spender）常量返回（uint256 remaining）{}事件传输（address indexed_from，address indexed_to，uint256_value）；事件批准（address indexed_owner，address indexed_spender，uint256_value）；}合同标准令牌是令牌{函数传输（address _to，uint256u value）返回（bool success）{/默认假设totalSupply不能超过max（2^256-1）。//如果您的代币不包括totalSupply，并且随着时间的推移可以发行更多的代币，那么您需要检查它是否不包装。//用这个代替if。//如果（余额[消息发送者]&gt；=u value&amp；balances[_to]+u value&gt；balances[_to]）{if（余额[发件人.msg]>=u value&amp；u value&gt；0）{余额[消息发送者]将余额转移到U值(消息发送者，u-to，_-value）；return true；}else{return false；}}函数传输自（address}from，addressu to，uint256u value）返回（bool success）{//同上。如果您想防止包装uint，请将此行替换为以下内容。//if（balances[u from]&gt；=u value&amp；allowed[u from][消息发送者]&gt；=u value&amp；balances[_to]+u value&gt；balances[u to]）{if（balances[_from]&gt；=u value&amp；allowed[_from][消息发送者]>=u value&amp；u value&gt；0）{balances[_to]+=u value；余额[_-from]-=u value；允许[u-from][消息发送者]—=u值；Transfer（_from，_to，_value）；return true；}else{return false；}function balanceOf（address_owner）常量返回（uint256 balance）{return balances[_owner]；}函数approve（address_spender，uint256_value）返回（bool success）{允许[消息发送者][u spender]=_value；审批(消息发送者，u spender，_value）；返回true；}函数允许量（address _owner，address_spender）常量返回（剩余uint256）{return allowed[_owner][u spender]；}映射（address=&gt；uint256）balances；mapping（address=&gt；uint256））allowed；uint256 public totalSupply；}contract HashnodeTestCoin is StandardToken{//更改此项。更新合同名称。/*令牌的公共变量//注意：以下变量是可选的虚变量。你不必包括他们。它们允许用户定制代币合约，并且不会影响核心功能。一些钱包/接口甚至可能懒得查看这些信息。/string public name；//令牌名uint8 public decimals；//要显示的小数位数。作为标准的共犯，请保留它18个字符串的公共符号；//一个标识符：例如SBX、XPR等。。string public version=’H1.0’；uint256 public unitsOneEthCanBuy；//1以太币可以购买多少单位？uint256 public totalEthInWei；//WEI是ETH的最小单位（相当于美元中的美分或BTC中的satoshi）。我们将在这里存储通过ICO筹集的总ETH。address public fund swallet；//筹集到的ETH应该去哪里？//这是一个构造函数函数//，这意味着下面的函数名必须与函数HashnodeTestCoin（）{balances）上面声明的约定名称匹配[消息发送者]=1000000000000000000000000；//给创建者所有初始令牌。例如，设置为10000。如果您希望初始标记为X，而十进制数为5，请将该值设置为X*100000。（更改此项）totalSupply=1000000000000000000000000；//更新总供应量（例如10000）（更改此项）name=“CRYPTOART”；//设置用于显示的名称（更改此项）decimals=18；//用于显示目的的小数位数（CHANGE THIS）symbol=“CART”；//设置用于显示的符号（CHANGE THIS）unitsOneEthCanBuy=10000；//设置ICO（CHANGE THIS）fundsWallet=消息发送者；//合同的所有者获得ETH}function（）应付{totalEthInWei=totalEthInWei+消息值；uint256金额=消息值*可以购买的单位；要求（余额[fundsWallet]&gt；=金额）；余额[fundsWallet]=余额[fundsWallet]-amount；余额[消息发送者]=余额[消息发送者]+金额；转账（资金转账，消息发送者，amount）；//向区块链blockchain广播消息//传输以太到fundsWallet资金转移(消息值); }/approve然后调用接收协定*/函数approveAndCall（addressu spender，uint256u value，bytesu extraData）返回（bool success）{allowed[消息发送者][u spender]=_value；审批(消息发送者，u spender，_value）；//调用要通知的合同的receiveApproval函数。它手工制作函数签名，这样就不必为此在这里包含一个合同。//receiveApproval（addressu from，uint256u value，addressu tokenContract，bytesu extraData）//假设什么时候调用应该成功，否则将使用vanilla approve。如果（！_斯宾德呼叫（字节4（字节32（sha3（“接收批准（address，uint256，address，bytes）”）），消息发送者，u value，this，_extraData））{throw；}return true；}

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