如何正确刷新Node.js文件writeStream？ [英] How to flush Node.js file writeStream properly?

问题描述

我的问题是我无法确定文件何时成功写入并且文件已关闭。考虑以下情况：

My Problem is that I can not be sure when a file has been successfully written to and the file has been closed. Consider the following case:

var fs = require('fs');
var outs = fs.createWriteStream('/tmp/file.txt');
var ins = <some input stream>

...
ins.on('data', function(chunk) { out.write(chunk); });
...
ins.on('end', function() {
   outs.end();
   outs.destroySoon();
   fs.stat('/tmp/file.txt', function(err, info) {

      // PROBLEM: Here info.size will not match the actual number of bytes.
      // However if I wait for a few seconds and then call fs.stat the file has been flushed.
   });
});

那么，在访问文件之前，如何强制或以其他方式确保文件已正确刷新？我需要确保文件存在且完整，因为我的代码必须生成一个外部进程来读取和处理文件。

So, how do I force or otherwise ensure that the file has been properly flushed before accessing it? I need to be sure that the file is there and complete, as my code has to spawn an external process to read and process the file.

推荐答案

在可写流 关闭 事件：

outs.on('close', function() {
  <<spawn your process>>
});

此外，不需要 destroySoon 之后结束，它们是同一个。

Also, no need for the destroySoon after the end, they are one and the same.

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