[英]How do you read a file or Stream synchronously in node.js?
Please, no lectures about how I should be doing everything asynchronously. 请不要讲述我应该如何异步地做所有事情。 Sometimes I want to do things the easy obvious way, so I can move on to other work.
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。
For some reason, the following code doesn't work. 由于某种原因,以下代码不起作用。 It matches code I found on a recent SO question .
它匹配我在最近的SO问题上找到的代码。 Did node change or break something?
节点改变或破坏了什么?
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());
After the read, the buffer is null. 读取后,缓冲区为空。
Looking at rs in the debugger, I see 我看到调试器中的rs
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
To read the contents of a file synchronously use fs.readFileSync 要同步读取文件的内容,请使用fs.readFileSync
var fs = require('fs');
var content = fs.readFileSync('myfilename');
console.log(content);
fs.createReadStream creates a ReadStream . fs.createReadStream创建一个ReadStream 。
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