Code to change owner

Question

Beginner = Tried the below code is not changing owner/account upon compiling. Any help will be appreciated

pragma solidity >=0.4.22 <0.7.0;
contract Owner {

    address private owner;
    
    event OwnerSet(address indexed oldOwner, address indexed newOwner);
    
    // modifier to check if caller is owner
    modifier isOwner() {
        _;
    }
    
    constructor() public {
        owner = msg.sender; // 'msg.sender' is sender of current call, contract deployer for a constructor
        emit OwnerSet(address(0), owner);
    }
    function changeOwner(address newOwner) public isOwner {
        emit OwnerSet(owner, newOwner);
        owner = newOwner;
    }
    function getOwner() external view returns (address) {
        return owner;
    }
}

Comments

Hi, @Wilson,

Are you facing any error while executing your code? As you have mentioned that the owner is not getting changed, does it giving any error?

Answer 1

@Wilson,

I would suggest you to go through this: 

modifier isOwner() {

require(msg.sender == owner,'you are not owner');

_;

}

contract Example {

constructor() public {}

function checkOwner() external isOwner() {

//is owner modifier called before function body then function can excute.

}

}

Answer 2

Hi, @Wilson,

U have to write the require error handling function in modifier and then u have to store the variable in msg.sender..like constructor public(){

Owner = msg.sender;

}

Modifier onlyOwner(){

require(msg.sender == owner);

}