javascript - Why my fs.readFileSync does not work - Stack Overflow

Why does this code not work? If I ment fs.readFileSync('file.html'); the code works and it creates the file 'file.html' But if I unment it the fs.writeFileSync does not work, and the program crashes with the error:

fs.js:427 return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode); ^ Error: ENOENT, no such file or directory 'file.html' at Object.fs.openSync (fs.js:427:18) at Object.fs.readFileSync (fs.js:284:15) at Object. (/home/pedro/startupEngineering/hw3/Bitstarter/testrestler.js:15:6) at Module._pile (module.js:456:26) at Object.Module._extensions..js (module.js:474:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Function.Module.runMain (module.js:497:10) at startup (node.js:119:16) at node.js:901:3

#!/usr/bin/env node


var fs = require('fs');
var rest = require('restler');

var restlerHtmlFile = function(Url) {
  rest.get(Url).on('plete', function(result) {
   fs.writeFileSync('file.html',result);
  });
};

if(require.main == module) {
  restlerHtmlFile('/');
  fs.readFileSync('file.html');
}

else {
 exports.checkHtmlFile = checkHtmlFile;
}

Why does this code not work? If I ment fs.readFileSync('file.html'); the code works and it creates the file 'file.html' But if I unment it the fs.writeFileSync does not work, and the program crashes with the error:

fs.js:427 return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode); ^ Error: ENOENT, no such file or directory 'file.html' at Object.fs.openSync (fs.js:427:18) at Object.fs.readFileSync (fs.js:284:15) at Object. (/home/pedro/startupEngineering/hw3/Bitstarter/testrestler.js:15:6) at Module._pile (module.js:456:26) at Object.Module._extensions..js (module.js:474:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Function.Module.runMain (module.js:497:10) at startup (node.js:119:16) at node.js:901:3

#!/usr/bin/env node


var fs = require('fs');
var rest = require('restler');

var restlerHtmlFile = function(Url) {
  rest.get(Url).on('plete', function(result) {
   fs.writeFileSync('file.html',result);
  });
};

if(require.main == module) {
  restlerHtmlFile('http://obscure-refuge-7370.herokuapp./');
  fs.readFileSync('file.html');
}

else {
 exports.checkHtmlFile = checkHtmlFile;
}

• javascript
• node.js
• fs

Share Improve this question Follow asked Sep 29, 2013 at 17:48 PedroPedro 4311 gold badge11 silver badge55 bronze badges 1

• 1 no such file or directory 'file.html' – SLaks Commented Sep 29, 2013 at 17:49

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2 Answers 2

Sorted by: Reset to default 2

Change

var restlerHtmlFile = function(Url) {
  rest.get(Url).on('plete', function(result) {
   fs.writeFileSync('file.html',result);
  });
};

if(require.main == module) {
  restlerHtmlFile('http://obscure-refuge-7370.herokuapp./');
  fs.readFileSync('file.html');
}

to

var restlerHtmlFile = function(Url) {
  rest.get(Url).on('plete', function(result) {
   fs.writeFileSync('file.html',result);
   fs.readFileSync('file.html');
  });
};

if(require.main == module) {
  restlerHtmlFile('http://obscure-refuge-7370.herokuapp./');
}

Second parameter to rest.get(Url).on is an asynchronous call back function, which will be called when plete occurs and only then the file gets created. But you are reading the file, even before the plete occurs. Thats why you are getting this error.

You don't write the file until the plete event fires, but you try to read from it immediately.

Since it doesn't yet exist, you get an exception, which you don't catch, so the program exits before the plete event fires and the file is written.

You need to move the code that tries to read from the file inside the event handler that writes the file.