在继续代码之前，如何完成 ytdl-core 下载

Question

if (message.body.indexOf('/yt') != -1) {
      const url = message.body.replace('/yt ', '')

      await ytdl(url).pipe(fs.createWriteStream('video.mp4'))
      
      // the code below does not wait for the download to finish
      const media = MessageMedia.fromFilePath('./video.mp4')
      client.sendMessage(message.from, media, { sendMediaAsDocument: true })
   }

我希望 ytdl-core 在运行剩余代码之前完成下载。

Answer 1

下载完成后，会触发close事件。您可以收听 close 事件。但是，你必须将它包装成一个 Promise，然后 await on the promise。

if (message.body.indexOf('/yt') != -1) {
  const url = message.body.replace('/yt ', '')

  await new Promise((resolve) => { // wait
    ytdl(url)
    .pipe(fs.createWriteStream('video.mp4'))
    .on('close', () => {
      resolve(); // finish
    })
  })

  // the code below does not wait for the download to finish
  const media = MessageMedia.fromFilePath('./video.mp4')
  client.sendMessage(message.from, media, { sendMediaAsDocument: true })
}

在继续代码之前，如何完成 ytdl-core 下载

How can I make the ytdl-core download complete before continuing with the code

javascript

youtube

node.js

async-await

ytdl