我现在正在学习nodejs,并试图建立一个简单的转换流。我正在创建的代码与一些教程相似-但我不断遇到错误。
现在,我只是尝试直接传递数据,但不做任何更改(为简便起见,我删除了一些注释行):
newstream.js:
var fs = require('fs');
var makeBig = require('./makeBig');
var myReadStream = fs.createReadStream(__dirname + '/Sample.txt');
var myWriteStream = fs.createWriteStream(__dirname + '/WriteMe.txt')
myReadStream
.pipe(makeBig)
.pipe(myWriteStream);
makeBig.js:
const Transform = require('stream').Transform;
const makeBig = new Transform({
transform(chunk, encoding, callback){
//chunk = chunk.toUpperCase();
//console.log(chunk);
this.push(chunk);
callback();
}
});
makeBig.js遵循NodeJS v7.9.0文档中描述的“ Simplified Constructor Approach”形式。
这是我得到的错误:
$ node newStream.js
_stream_readable.js:501
dest.on('unpipe', onunpipe);
^
TypeError: dest.on is not a function
at ReadStream.Readable.pipe (_stream_readable.js:501:8)
at Object.<anonymous> (/home/thodges/Workspace/Node/streams/newStream.js:15:2)
at Module._compile (module.js:571:32)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:488:32)
at tryModuleLoad (module.js:447:12)
at Function.Module._load (module.js:439:3)
at Module.runMain (module.js:605:10)
at run (bootstrap_node.js:420:7)
at startup (bootstrap_node.js:139:9)
最佳答案
您的makeBig.js文件中是否包含module.exports = makeBig;
?