nodejs的readline怎么支持字符串逐行读取

想要逐行读取一个字符串，看了readline表示有点小疑问啊，因为readline.createInterface(options)传进去的input要求是个流，所以我需要将我的字符串转成文本流，尝试用

var fs = require('fs'),
    readline = require('readline');

var Stream = require('stream')
var stream = new Stream()

stream.pipe = function(dest) {
    dest.write(mailcontent)
}

stream.pipe(process.stdout)

console.log(process.input);

var rd = readline.createInterface({
    input: stream,
    output: process.stdout,
    terminal: false
});

rd.on('line', function(line) {
    console.log(line);
});

会报错，如下：

readline.js:142
  input.resume();
        ^
TypeError: Object #<Stream> has no method 'resume'
    at new Interface (readline.js:142:9)
    at Object.exports.createInterface (readline.js:39:10)
    at Readable.<anonymous> (D:\mynodejs\node-server\mailUtil.js:66:47)
    at Readable.g (events.js:180:16)
    at Readable.EventEmitter.emit (events.js:92:17)
    at _stream_readable.js:920:16
    at process._tickCallback (node.js:415:13)

是不是我哪儿理解错了啊？

GuoZhang 1楼•8个月前

看起来应该是由String构造的Stream有些问题。用fs.createReadStream构造的没有问题。

var readline = require('readline'),
    fs = require('fs');

var rl = readline.createInterface({
    input: fs.createReadStream(__filename),
    output: process.stdout,
    terminal: false
});

rl.on('line', function(line) {
    console.log('> ' + line);
    // you won't see the last line here, as 
    // there is no \n any more
});

chuchangming 2楼•5个月前

Stream好像是类似于抽象的。