Question

contract FirstContract {

    function createOtherContract() payable returns(address) {
        // this function is payable. I want to take this 
        // value and use it when creating an instance of 
        // SecondContract
    }
}

contract SecondContract {
    function SecondContract() payable { 
        // SecondContract's constructor which is also payable
    }

    function acceptEther() payable {
        // Some function which accepts ether
    }
}

当用户点击网站上的按钮时，将从js应用创建FirstContract。然后我想创建第二个合同的实例并将以太传递给新合同。我无法弄清楚如何在发送以太时从第一个合同中调用SecondContract的构造函数。

Answer 1

编辑：我找到了解决方案：

pragma solidity ^0.4.0;

contract B {
    function B() payable {}
}

contract A {
    address child;

    function test() {
        child = (new B).value(10)(); //construct a new B with 10 wei
    }
}

来源：http://solidity.readthedocs.io/en/develop/frequently-asked-questions.html#how-do-i-initialize-a-contract-with-only-a-specific-amount-of-wei

使用您的代码，它看起来如下所示：

pragma solidity ^0.4.0;

contract FirstContract {

    function createOtherContract() payable returns(address) {
        return (new SecondContract).value(msg.value)();
    }
}

contract SecondContract {
    function SecondContract() payable { 
    }

    function acceptEther() payable {
        // Some function which accepts ether
    }
}

我可以通过其构造函数从另一个合同中将eth发送给合同。

1 个答案: