javascript - Node JS: storing music metadata on JSON -

-

i'm begginer in node js , i'm trouble trying build json object.

i've found module find metadata of mp3 file , want store information on json obj.

the behaviour of applicaiton following:

  1. read "music" directory.
  2. for each file on directory, extract info , store in structure "jsonsong". push "jsonsong" structure called "jsonobj".
  3. make console.log of "jsonobj" see result.

here's code:

var fs = require('fs'); var mm = require('musicmetadata');  fs.readdir('./music/', function(err,files) {     if(err) throw err;     var jsonobj = {                     songs: []                 };     files.foreach(function(file){         var jsonsong = {                          title:"",                         artist:"",                         duration:"",                         pic:""                     }         var parser = new mm(fs.createreadstream('./music/'+file));         parser.on('title', function(result) {             jsonsong.title = result;         });         parser.on('albumartist', function(result) {             jsonsong.artist = result;         });         parser.on('duration', function(result) {             jsonsong.duration = result;         });         parser.on('picture', function(result) {             jsonsong.pic = result;         });          jsonobj.songs.push(jsonsong);     });     console.log(jsonobj); });

my problem here "jsonsong" seems empty, here's result of last console.log (i have 3 songs on music dir, have 3 entrys on structure):

{ songs:     [ { title: '', artist: '', duration: '', pic: '' },      { title: '', artist: '', duration: '', pic: '' },      { title: '', artist: '', duration: '', pic: '' } ] }

thanks time.

you have wait callbacks execute before data gets populated, can use done event.

parser.on('done', function (err) {   console.log(jsonobj); });

Comments

Post a Comment

Popular posts from this blog

c# - Unity IoC Lifetime per HttpRequest for UserStore -

-
i'm trying clean default implementation of accountcontroller.cs comes out of box in new mvc5/owin security implementation. have modified constructor this: private usermanager<applicationuser> usermanager; public accountcontroller(usermanager<applicationuser> usermanager) { this.usermanager = usermanager; } also, have created lifetime manager unity looks this: public class httpcontextlifetimemanager<t> : lifetimemanager, idisposable { private httpcontextbase _context = null; public httpcontextlifetimemanager() { _context = new httpcontextwrapper(httpcontext.current); } public httpcontextlifetimemanager(httpcontextbase context) { if (context == null) throw new argumentnullexception("context"); _context = context; } public void dispose() { this.removevalue(); } public override object get...
Read more

Change the color of an oval at click in Java AWT -

-
i have draw ovals in java, , @ click change color. beginning tried change color after 20 ms, doesn't work. my code is: public class mycomponentnew extends frame { public graphics2d g2d; public mycomponentnew(string title) { super(title); setsize(400, 550); } @override public void paint(graphics g) { this.g2d = (graphics2d) g; this.g2d.setcolor(color.red); this.g2d.filloval(10, 55, 50, 100); } public void changecolor () { this.g2d.setcolor(color.blue); this.g2d.filloval(10, 55, 50, 100); } } and in class main method have: mycomponentnew m; m = new mycomponentnew("fereastra cu baloane"); m.setvisible(true); m.addwindowlistener(new windowadapter() { @override public void windowclosing(windowevent we) { system.exit(0); } }); try { thread.sleep(20); } catch(interruptedexception e) {} m.changecolor(); the color of oval remains red. ...
Read more

I am trying to solve the error message 'incompatible ranks 0 and 1 in assignment' in a fortran 95 program. -

-
i writing program in fortran find velocity of parachuting person in relation time. keep getting error can't fix. new programming , appreciated. the error is v(i+1)=v(i)+[32-((c*v(i)*v(i))/m)]*(h) 1 error: incompatible ranks 0 , 1 in assignment @ (1) and program is program para integer :: real :: v(11) !velocity real :: q !initial velocity real :: h !time step real :: c !drag coefficient real :: m !mass ! gravity equal 32 ft/s^2 write (*,*)'enter time step' read(*,*)h write(*,*)'enter initial velocity' read(*,*)q write(*,*)'enter drag coefficient' read(*,*)c write(*,*)'enter mass' read(*,*)m i=1,10 ! 1 10, 1 being interval. end v(i+1)=v(i)+[32-((c*v(i)*v(i))/m)]*(h) q=v(1) end program you cannot use [] normal parenthesis in expressions. array constructor, [ items ] means array items elements. end do should after line.
Read more