Web3 无法从合同中获取公共变量的值

Question

坚固代码：

pragma solidity ^0.5.8;


 contract remainNew{

    address public owner = msg.sender;
    uint public cubeCount = 0;

    modifier onlyBy(address _account){
    require(
        msg.sender == _account,
        "Sender not authorized"
    );
    _;
}

struct aCube{
    uint cubeID;
    string owner;
    string ipfsHash;
    string fileName;
    string fileSize;
    string description;
    bool isEncrypted;
    string time;
}

mapping(uint => aCube) public cubes;


function generateCube(string memory _o,string memory _h, string memory _n, string memory _s,
 string memory _d, bool  _i, string memory _t) public {
    cubeCount++;
    cubes[cubeCount] = aCube(cubeCount,_o,_h,_n,_s,_d,_i,_t);
   }

function setHash(string memory _newHash, uint _ID) public onlyBy(owner){
    cubes[_ID].ipfsHash = _newHash;
  }

}

阿比：

"abi": [
{
  "constant": true,
  "inputs": [
    {
      "name": "",
      "type": "uint256"
    }
  ],
  "name": "cubes",
  "outputs": [
    {
      "name": "cubeID",
      "type": "uint256"
    },
    {
      "name": "owner",
      "type": "string"
    },
    {
      "name": "ipfsHash",
      "type": "string"
    },
    {
      "name": "fileName",
      "type": "string"
    },
    {
      "name": "fileSize",
      "type": "string"
    },
    {
      "name": "description",
      "type": "string"
    },
    {
      "name": "isEncrypted",
      "type": "bool"
    },
    {
      "name": "time",
      "type": "string"
    }
  ],
  "payable": false,
  "stateMutability": "view",
  "type": "function"
},
{
  "constant": true,
  "inputs": [],
  "name": "cubeCount",
  "outputs": [
    {
      "name": "",
      "type": "uint256"
    }
  ],
  "payable": false,
  "stateMutability": "view",
  "type": "function"
},
{
  "constant": true,
  "inputs": [],
  "name": "owner",
  "outputs": [
    {
      "name": "",
      "type": "address"
    }
  ],
  "payable": false,
  "stateMutability": "view",
  "type": "function"
},
{
  "constant": false,
  "inputs": [
    {
      "name": "_o",
      "type": "string"
    },
    {
      "name": "_h",
      "type": "string"
    },
    {
      "name": "_n",
      "type": "string"
    },
    {
      "name": "_s",
      "type": "string"
    },
    {
      "name": "_d",
      "type": "string"
    },
    {
      "name": "_i",
      "type": "bool"
    },
    {
      "name": "_t",
      "type": "string"
    }
  ],
  "name": "generateCube",
  "outputs": [],
  "payable": false,
  "stateMutability": "nonpayable",
  "type": "function"
},
{
  "constant": false,
  "inputs": [
    {
      "name": "_newHash",
      "type": "string"
    },
    {
      "name": "_ID",
      "type": "uint256"
    }
  ],
  "name": "setHash",
  "outputs": [],
  "payable": false,
  "stateMutability": "nonpayable",
  "type": "function"
}
 ]

网站 3：

 try{

const fileCount = await contract.methods.cubeCount().call();

console.log(fileCount);

}catch(error){
    console.log(error);
    return;
}

错误：

错误：返回值无效，是不是没油了？ 如果您没有为从中检索数据的合约使用正确的 ABI，从不存在的块号请求数据，或者查询未完全同步的节点，您也可能会看到此错误。 在 ABICoder.push../node_modules/web3-eth-abi/src/index.js.ABICoder.decodeParameters (index.js:226) 在 Contract.push../node_modules/web3-eth-contract/src/index. js.Contract._decodeMethodReturn (index.js:471)

web3版本是：1.2.4

从公共变量中检索值时出现问题。 虽然我在这里使用 await，但它似乎没有返回 promise。我可以毫无错误地使用 send() function。 需要帮助，谢谢。

如果我使用const fileCount = await contract.methods.cubeCount.call(); 相反，我会得到一个 object：

{arguments: Array(0), call: ƒ, send: ƒ, encodeABI: ƒ, estimateGas: ƒ, …} arguments: [] call: ƒ () encodeABI: ƒ () estimateGas: ƒ () 发送: ƒ () _ethAccounts: 帐户 {_requestManager: RequestManager, givenProvider: Proxy, providers: {...}, _provider: Proxy, ...} _method: {constant: true, inputs: Array(0), name: "cubeCount", outputs: Array(1) , payable: false, …} _parent: Contract {_requestManager: RequestManager, givenProvider: Proxy, providers: {…}, _provider: Proxy, …} proto : Object

Answer 1

确保您已部署最新联系人

就我而言，我需要这个。

truffle migrate --reset