fs | 易学教程

Node.js check exist file

阅读更多关于 Node.js check exist file

How do i check the existence of a file ? In the documentation for the module fs there's a description of the method fs.exists(path, callback) . But, as I understand, it checks for the existence of only directories. And I need to check the file ! How can this be done? Fox Why not just try opening the file ? fs.open('YourFile', 'a', function (err, fd) { ... }) anyway after a minute search try this : var path = require('path'); path.exists('foo.txt', function(exists) { if (exists) { // do something } }); // or if (path.existsSync('foo.txt')) { // do something } For Node.js v0.12.x and higher Both

Get all files recursively in directories NodejS

阅读更多关于 Get all files recursively in directories NodejS

问题 I have a little problem with my function. I would like to get all files in many directories. Currently, I can retrieve the files in the file passed in parameters. I would like to retrieve the html files of each folder in the folder passed as a parameter. I will explain if I put in parameter "test" I retrieve the files in "test" but I would like to retrieve "test / 1 / *. Html", "test / 2 / . / .html ": var srcpath2 = path.join('.', 'diapo', result); function getDirectories(srcpath2) { return

「学习笔记」杂项算法大礼包

阅读更多关于「学习笔记」杂项算法大礼包

平面最近点对。 #include <algorithm> #include <cstdio> #include <vector> #include <cmath> using namespace std; #define fs first #define sc second typedef double db; typedef pair<db, db> pa; const int N = 2e5 + 10; const db EPS = 1e-10; int cmp1(pa a, pa b) { return a.fs - b.fs < -EPS; } int cmp2(pa a, pa b) { return a.sc - b.sc < -EPS; } int n, m; pa a[N], arr[N]; db p(db x) { return x * x; } db d(pa x, pa y) { return sqrt(p(x.fs - y.fs) + p(x.sc - y.sc)); } db divide(int l, int r) { if(r - l <= 2) { db ans = 3e18; for(int i = l; i < r; i ++) for(int j = i + 1; j <= r; j ++) ans = min(ans, d(a[i], a[j

chaining `fs.readdir` with a `.then` to return an array

阅读更多关于 chaining `fs.readdir` with a `.then` to return an array

问题 I am trying to create an array of specific files in a directory; which will go through a few test cases to make sure it fits a given criteria. I'm using the fs.readdir method, but it doesn't return a promise meaning I cannot push to an array . My idea was to populate an array ( arr ) with the files I actually want to output and then do something with that array. But because readdir is asynchronous and I can't chain a .then() onto it, my plans are quashed. I've also tried the same thing with

Find absolute base path of the project directory

阅读更多关于 Find absolute base path of the project directory

Until now we could get the absolute path of a file to open later as readStream with this code snippet: var base = path.resolve('.'); var file = base + '/data/test.csv'; fs.createReadStream(file) Since Meteor 0.6.5 the base path is pointing to .meteor/local/build/programs/... There is also the Assets API, which but can not give us back a path but only the read document. We but need a stream to process some bigger data files? Another way to find your project's root directory now is this: var base = process.env.PWD Note that this is not the same as process.cwd() . Instead it is the directory

Asynchronously reading and caching multiple files in nodejs

阅读更多关于 Asynchronously reading and caching multiple files in nodejs

问题 I have an array which keeps URL of several files. For example: var files = ['1.html', '2.html', '3.html']; I need to read them asynchronously and save them in an object named cache (cache = {}). To do this I used the code: for(var i = 0; i < files.length; i++){ require('fs').readFile(files[i], 'utf8', function (error,data) { cache[files[i]]=data; }); } In the end I have the result: cache = { undefined : 'File 3 content' } I do understand that the "readFile" acts after the loop is ended and it

How to create full path with node's fs.mkdirSync?

阅读更多关于 How to create full path with node's fs.mkdirSync?

I'm trying to create a full path if it doesn't exist. The code looks like this: var fs = require('fs'); if (!fs.existsSync(newDest)) fs.mkdirSync(newDest); This code works great as long as there is only one subdirectory (a newDest like 'dir1') however when there is a directory path like ('dir1/dir2') it fails with Error: ENOENT, no such file or directory I'd like to be able to create the full path with as few lines of code as necessary. I read there is a recursive option on fs and tried it like this var fs = require('fs'); if (!fs.existsSync(newDest)) fs.mkdirSync(newDest,'0777', true); I feel

Node.js check if path is file or directory

阅读更多关于 Node.js check if path is file or directory

问题 I can't seem to get any search results that explain how to do this. All I want to do is be able to know if a given path is a file or a directory (folder). 回答1: fs.lstatSync(path_string).isDirectory() should tell you. From the docs: Objects returned from fs.stat() and fs.lstat() are of this type. stats.isFile() stats.isDirectory() stats.isBlockDevice() stats.isCharacterDevice() stats.isSymbolicLink() (only valid with fs.lstat()) stats.isFIFO() stats.isSocket() NOTE: The above solution will

wav文件与byte互转 C#

阅读更多关于 wav文件与byte互转 C#

//wav转byte public void WavToByte() { Byte[] bs; FileStream fs = new FileStream(@"C:\1.wav", FileMode.Open, FileAccess.Read); bs = new Byte[fs.Length]; fs.Read(bs, 0, (int)fs.Length); fs.Close(); } //byte转wav public void ByteToWav(Byte[] bs) { FileStream fs = new FileStream(@"C:\2.wav", FileMode.OpenOrCreate, FileAccess.Write); fs.Write(bs, 0, bs.Length); fs.Close(); } 来源： https://www.cnblogs.com/macT/p/11338514.html

How to close a readable stream (before end)?

阅读更多关于 How to close a readable stream (before end)?

How to close a readable stream in Node.js? var input = fs.createReadStream('lines.txt'); input.on('data', function(data) { // after closing the stream, this will not // be called again if (gotFirstLine) { // close this stream and continue the // instructions from this if console.log("Closed."); } }); This would be better than: input.on('data', function(data) { if (isEnded) { return; } if (gotFirstLine) { isEnded = true; console.log("Closed."); } }); But this would not stop the reading process... Nitzan Shaked Invoke input.close() . It's not in the docs, but https://github.com/joyent/node/blob