在编写代码时,我们应该有一些方法将程序像连接水管一样连接起来 -- 当我们需要获取一些数据时,可以去通过"拧"其他的部分来达到目的.这也应该是IO应有的方式. -- Doug McIlroy. October 11, 1964 为什么应该使用stream? 在node中,I/O都是异步的,所以在和硬盘以及网络的交互过程中会涉及到传递回调函数的过程.你之前可能会写出这样的代码: var http = require('http'); var fs = require('fs'); var
Stream: 类似这样:a.pipe(b).pipe(c); 我想写一个b.所以: var rs=new (require('stream').Readable)(); var ws=new (require('stream').Writable)(); rs._read=function(){ this.push('send a msn for the first time'); this.push('send a msn for the second time'); this.push(n
Node.js come alone with many Stream API. Stream is useful when handling large trunck of data. For example, we have a big file to read from file system: // create-big-file.js const fs = require('fs') const file = fs.createWriteStream('./big.file') for
如果有一个文件aaa.txt,有若干行,不知道每行中含有几个整数,要编程输出每行的整数之和,该如何实现? 由于cin>>不能辨别空格与回车的差异,因此只能用getline的方式逐行读入数据到string变量中,但在string变量中分离若干个整数还是稍显吃力.一个好的方法是用string流: #include<iostream> #include<sstream> #include<fstream> using namespace std; int main
stream在Unix系统中是个标准的概念. In computer programming, standard streams are preconnected input and output communication channels[1] between a computer program and its environment when it begins execution. The three I/O connections are called standard input