回调处理管道的完成 [英] callback to handle completion of pipe

问题描述

我正在使用以下node.js代码从某些url下载文档并将其保存在磁盘中. 我想知道何时下载该文档.我没有看到管道回调.或者，下载完成后是否可以捕获任何结束"事件?

I am using the following node.js code to download documents from some url and save it in the disk. I want to be informed about when the document is downloaded. i have not seen any callback with pipe.Or, Is there any 'end' event that can be captured on completion of download ?

request(some_url_doc).pipe(fs.createWriteStream('xyz.doc'));

推荐答案

流是EventEmitter，因此您可以收听某些事件.如您所说，有一个finish事件用于请求(以前是end).

Streams are EventEmitters so you can listen to certain events. As you said there is a finish event for request (previously end).

 var stream = request(...).pipe(...);
 stream.on('finish', function () { ... });

有关可用事件的更多信息，请查看流文档页面.

For more information about which events are available you can check the stream documentation page.

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