solidity基础（支付ETH+发送ETH）

Posted 2023-03-08 泠泠在路上

一、合约支付ETH

pragma solidity >=0.7.0 <0.9.0;

contract Payable
//payable关键词，函数可以接受以太坊主币的传入，否则传入会报错
    
    address payable public owner;//将地址标记为payable属性，地址就能发送以太坊主币
    constructor()
        owner=payable(msg.sender);
    
     //函数接受主币
     function desposit() external payable

     function getBalance() external view returns (uint)
         return address(this).balance;
     

二、合约发送ETH

有3种方式发送：
1.transfer 2300 gas ，失败会reverts
2.send 2300 gas，返回bool类型标记是否发送成功
3.call 剩余的所有gas， 返回bool和data数据

contract SendEther
//传入主币
constructor() payable 
receive() external payable 
//transfer
function sendViaTransfer(address payable _to) external payable
  _to.transfer(123);

//send
function sendViaSend(address payable _to) external payable
    bool sent=_to.send(123);
    require(sent,"send fail");

//call
function sendViaCall(address payable _to) external payable
   (bool success,)= _to.callvalue:123("");
    require(success,"call faild");

 
//接收主币的log
 contract EthReceiver
    event Log(uint amount,uint gas);
    receive() external payable
    emit Log(msg.value,gasleft());