下载图像后的回调功能 [英] Callback function after image has downloaded

问题描述

我正在尝试使用请求模块保存图像下载.有了

I'm trying to save an image download with the request module. With this

request('http://google.com/images/logos/ps_logo2.png').pipe(fs.createWriteStream('doodle.png')); 

工作正常. 但是，我希望能够在图像完全下载后执行其他操作. 如何为fs.createWriteStream提供回调函数?

It works fine. But I want to be able to do something else after the image has been completely downloaded. How can provide a callback function to fs.createWriteStream ?

推荐答案

您要提前创建流，然后在close事件上执行某些操作.

You want to create the stream ahead of time and then do something on the close event.

var picStream = fs.createWriteStream('doodle.png');
picStream.on('close', function() {
  console.log('file done');
});
request('http://google.com/images/logos/ps_logo2.png').pipe(picStream); 

这应该做到.

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