我该如何修复来自 fs.outputJsonSync node.js 的错误

Question

我正在使用 node js 编译智能合约。

我想从这个智能合约中导入两个对象（代表两个合约）并将它们存储在名为“build”的文件目录中，扩展名为 JSON。

当我运行命令节点 compile.js 时，我得到了这个错误：

errno: -4058, syscall: 'open', code: 'ENOENT'.

当我调试我的代码时，错误发生在 fs.outputJsonSync?

const path = require("path");
const fs = require("fs-extra");

const solc = require("solc");

const buildPath = path.resolve(__dirname, "build");

fs.removeSync(buildPath);


const campaignPath = path.resolve(__dirname, "contracts", "Campaign.sol");


const source = fs.readFileSync(campaignPath, "utf8");


const output = solc.compile(source, 1).contracts;
console.log(output);

fs.ensureDirSync(buildPath);

// To loop throught the contracts that contains 2 objects with data 
for (let contract in output) { 
    fs.outputJsonSync(
        path.resolve(buildPath, contract + ".json"),
        output[contract] 
    );
}

Answer 1

此错误表明文件不存在。读取文件时出现错误，请确保在读取文件之前存在该文件，因为 fs.outputJsonSync 如果文件不存在则创建该文件。

// Function call
// Using callback function
fs.outputJSON(file, {name: "David"}, err => {
  if(err) return console.log(err);
  console.log("Object written to given JSON file");
});

尽量保留try/catch中的readFileSync方法：

const path = require("path");
const fs = require("fs-extra");

const solc = require("solc");

const buildPath = path.resolve(__dirname, "build");

fs.removeSync(buildPath);

let output;
const campaignPath = path.resolve(__dirname, "contracts", "Campaign.sol");

try {
const source = fs.readFileSync(campaignPath, "utf8");
      output = solc.compile(source, 1).contracts;
console.log(output);
fs.ensureDirSync(buildPath);
} catch (e) {
  console.log(`Error while reading the file ${e}`);
}


// To loop throught the contracts that contains 2 objects with data 
for (let contract in output) { 
   try {
    fs.outputJsonSync(
        path.resolve(buildPath, contract + ".json"),
        output[contract] 
    );
   } catch (e) {
      console.log(`Error while writing JSON: ${e}`);
   }
}

最好把不同的操作包在不同的try/catch下，以便错误分离。

我该如何修复来自 fs.outputJsonSync node.js 的错误

How can i fix the error coming from fs.outputJsonSync node.js

filesystems

object

node.js