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玩以太坊智能合约我遇到了以下问题。合约部署在 Ropsten 上，然后我尝试在 geth 上使用以下代码调用函数“addRecipe”：

recipes.addRecipe(300, "zupa", "zupa z trupa", {from:web3.eth.accounts[0], gas: 20000000})

该函数如下所示：

function addRecipe(uint256 _price, string _name, string _content) public {

    recipes[recipeCount].price = _price;
    recipes[recipeCount].name = _name;
    recipes[recipeCount].content = _content;
    recipes[recipeCount].recipeOwner = msg.sender;

    recipeCount++;
}

我得到了 TX 哈希，但在 Etherscan 中查找交易给出了

 Warning! Error encountered during contract execution [Bad instruction]

你可以在这里查看： https ://ropsten.etherscan.io/tx/0xe5999c2d122e4871e82f5986397dfd39107cee2056a9280132abeaa460c0f66d

向函数添加 'payable' 修饰符或使用以下命令不会产生更好的结果...

recipes.addRecipe.sendTransaction(300, "zupa", "zupa z trupa", {from:web3.eth.accounts[0], gas: 200000000})

整个合同：

pragma solidity ^0.4.24;

contract Recipes {

    address owner;
    uint256 recipeCount = 0;

    struct Recipe {
        string name;
        string content;
        uint256 price;
        address recipeOwner;
    }

    Recipe[] public recipes;

    function () public {
        owner = msg.sender;
    }

    function kill() public {
        require (msg.sender == owner);
        selfdestruct(owner);
    }


    function addRecipe(uint256 _price, string _name, string _content) public {

        recipes[recipeCount].price = _price;
        recipes[recipeCount].name = _name;
        recipes[recipeCount].content = _content;
        recipes[recipeCount].recipeOwner = msg.sender;

        recipeCount++;
    }

    function showRecipes(uint256 _id) constant returns(string) {

        return recipes[_id].content;

    }

}
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1 回答 1

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recipes是一个动态存储阵列。您需要更改数组的大小以向其中添加新元素。您可以通过显式增加数组的长度或将新元素推入数组来做到这一点。

function addRecipe(uint256 _price, string _name, string _content) public {
    recipes.length++;
    recipes[recipeCount].price = _price;
    recipes[recipeCount].name = _name;
    recipes[recipeCount].content = _content;
    recipes[recipeCount].recipeOwner = msg.sender;

    recipeCount++;
}

或者

function addRecipe(uint256 _price, string _name, string _content) public {
    Recipe memory r;
    r.price = _price;
    r.name = _name;
    r.content = _content;
    r.recipeOwner = msg.sender;

    recipes.push(r);

    recipeCount++;
}
于 2018-07-03T18:46:04.230 回答