Node.js: [ERR_INVALID_ARG_TYPE]: "data"参数必须为string

Question

我试图使一个不和谐的机器人，保存图像发送到一个文件夹，我得到这个错误:

TypeError: [ERR_INVALID_ARG_TYPE]: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received undefined.

这是我的代码:

const Discord = require("discord.js");
const fs = require("fs");
const client = new Discord.Client();
var prefix = "."
client.on("ready", () => {
client.user.setStatus('online');
console.log("Bot is on.")
});
client.on("message", message => {
console.log(__dirname)
var image = message.attachments.first()
fs.writeFileSync(`./${image.name}`, image.file);
})
client.login(process.env.token);

注意:我使用的是Discord.js v12.5.3

Answer 1

attachments上没有file属性。有一个url属性，您可以从其中下载图像。您可以使用node-fetch来获取文件(您需要通过在命令行中运行npm i node-fetch@2来安装它)。获取文件后，可以使用fs.writeFileSync()。

下面的代码可以正常工作:

// using discord.js v12
const { Client } = require('discord.js');
const fetch = require('node-fetch');
const fs = require('fs');
const client = new Client();
const prefix = '.';
client.on('message', async (message) => {
if (message.author.bot) return;
const image = message.attachments.first();
if (!image)
return console.log('No attached image found');
// add more if needed
const imageFiles = ['image/gif', 'image/jpeg', 'image/png', 'image/webp'];
if (!imageFiles.includes(image.contentType))
return console.log('Not an image file');
try {
const res = await fetch(image.url);
const buffer = await res.buffer();
fs.writeFileSync(`./${image.name}`, buffer);
} catch (error) {
console.log(`Error reading/writing image file:`, error);
}
});