与 node.js 中的 fs.createWriteStream 关​​联的事件 [英] event associated with fs.createWriteStream in node.js

问题描述

在写入流时达到 EOF 会触发什么事件?我的代码如下.它是根据 http://docs.nodejitsu.com/articles/advanced/streams/how-to-use-fs-create-write-stream

What event is triggered when EOF is reached while writing to a stream ? My code is as follows. and it is as per http://docs.nodejitsu.com/articles/advanced/streams/how-to-use-fs-create-write-stream

但令人惊讶的是，我的结束"事件从未被触发.当我检查 http://nodejs.org/api/stream.html#stream_event_end 时，我看到了可写流'end' 上没有任何事件

But surprisingly my 'end' event is never fired. When I checked http://nodejs.org/api/stream.html#stream_event_end, I see that writable stream does not have any event on 'end'

var x = a1.jpg;
var options1 = {'url': url_of_an_image, 'encoding': null};
var r = request(options1).pipe(fs.createWriteStream('/tmp/imageresize/'+x));

r.on('end', function(){
    console.log('file downloaded to ', '/tmp/imageresize/'+x);
}

如何捕获 EOF 事件?

How do I capture the EOF event ?

推荐答案

2013 年 10 月 30 日更新

可读 Steam在底层资源完成写入时发出 close 事件..>

r.on('close', function(){
  console.log('request finished downloading file');
});

但是如果你想抓住 fs 完成向光盘写入数据的那一刻，你需要 可写流finish事件:

But if you want to catch the moment when fs finished writing data to the disc, you need Writeable Stream finish event:

var w = fs.createWriteStream('/tmp/imageresize/'+x);

request(options1).pipe(w);

w.on('finish', function(){
  console.log('file downloaded to ', '/tmp/imageresize/'+x);
});

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