在继续使用代码之前，如何使ytdl-core下载完成？

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核心在运行剩余代码之前完成下载。

Answer 1

下载过程完成后，它将触发close事件。您可以收听close事件。但是，你必须把它包装成一个承诺，然后只是承诺的await。

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 })
}