你如何在node.js中同步读取文件或流？ [英] How do you read a file or Stream synchronously in node.js?

问题描述

请不要讲授我应该如何异步地做所有事情。有时我想以简单明了的方式做事，所以我可以继续其他工作。

Please, no lectures about how I should be doing everything asynchronously. Sometimes I want to do things the easy obvious way, so I can move on to other work.

由于某种原因，以下代码不起作用。它匹配我在最近的SO问题上找到的代码。节点是否改变或破坏了什么？

For some reason, the following code doesn't work. It matches code I found on a recent SO question. Did node change or break something?

var fs = require('fs');
var rs = fs.createReadStream('myfilename');  // for example
                                             // but I might also want to read from
                                             // stdio, an HTTP request, etc...
var buffer = rs.read();     // simple for SCCCE example, normally you'd repeat in a loop...
console.log(buffer.toString());

读取后，缓冲区为空。

在调试器中查看rs，我看到

Looking at rs in the debugger, I see

events  
   has end and open functions, nothing else
_readableState
  buffer = Array[0]
  emittedReadable = false
  flowing = false   <<< this appears to be correct
  lots of other false/nulls/undefined
fd = null   <<< suspicious???
readable = true
  lots of other false/nulls/undefined

推荐答案

要同步读取文件内容，请使用 fs.readFileSync

To read the contents of a file synchronously use fs.readFileSync

var fs = require('fs');
var content = fs.readFileSync('myfilename');
console.log(content);

fs.createReadStream 创建 ReadStream 。

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