我正在尝试创建一个返回数组的公共函数, 这是错误
返回参数类型映射(uint256 =>结构ItemList.Item存储 ref)不能隐式转换为预期的类型(第一个类型 返回变量)uint256 []内存。
pragma solidity ^0.5.0;
contract ItemList {
uint public itemCount = 0;
mapping(uint256 => Item) public items;
event ItemCreated (
uint id,
string proofdocument
);
struct Item {
uint id;
string proofdocument;
}
constructor() public {
}
function createItem(string memory _proofdocument) public {
itemCount++;
items[itemCount] = Item(itemCount, _proofdocument);
emit ItemCreated(itemCount, _proofdocument);
}
function getItems() public pure returns(uint256[] memory ) {
return items; <----------ERROR
}
}
感谢安德里亚
答案 0 :(得分:0)
您可以通过web3.js
库获取循环中的所有项目
const array = []
for (let i = 0; i < itemCount; itemCount += 1) {
array.push(contract.getItem(i)) // where getItem do items[I] in solidity
}
或者您可以使用pragma experimental
版本:
pragma solidity ^0.5.0;
pragma experimental ABIEncoderV2;
contract ItemList {
uint public itemCount = 0;
struct Item {
uint id;
string proofdocument;
}
Item[] items;
constructor() public {}
function createItem(string memory _proofdocument) public {
itemCount++;
items.push(Item(itemCount, _proofdocument));
}
function getItems() external view returns(Item[] memory) {
return items;
}
}