Development c# interface problem

im trying to write my own app to store my music on SQL server using MVP and interfaces

Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Music.Presenter.interfaces;
using Music.Entities;
using Music.Services.Interfaces;
using Music.Services;
using System.IO;


namespace Music.Presenter
{

   
    public class MusicPresenter:IMusicPresenter

    {
        #region IMusicPresenter Members

        //Error	1	Cannot create an instance of the abstract class or interface 
        //'Music.Services.Interfaces.IMusicService'	
        //C:\Projects\MusicProgram\Music.Presenter\MusicPresenter.cs	
        //22	34	Music.Presenter

        IMusicService MService =[U] new IMusicService();[/U]
        public string[] GetFileList(string Folder)
        {
          string[] locations =   MService.BuildLibrary(Folder);

          return locations;
        }

        public bool CreateLibrary(IList<MP3> FileList)
        {
            throw new NotImplementedException();
        }

        public bool UpdateLibrary(IList<MP3> FileList)
        {
            throw new NotImplementedException();
        }

        public MP3 GetFileInfo(string Location)
        {
            throw new NotImplementedException();
        }

        #endregion
    }
}

now i get an error trying to implement the interface

yet MService.BuildLibrary(Folder); is picked up fine what am i missing here?

the MService project builds fine im guessing i just have my syntax wrong or something

 

What does the error say exactly?

 

Is IMusicService abstract?

 

//Error 1 Cannot create an instance of the abstract class or interface
//'Music.Services.Interfaces.IMusicService'
//C:\Projects\MusicProgram\Music.Presenter\MusicPresenter.cs
//22 34 Music.Presenter

 

Right, you can't create an instance of an interface. You have to create an instance of a class that implements that interface

 

I agree.

 

yep works now thanks

next problem is that i need to read ID3 tags using Vista!!

 

There's a great site out there providing libraries to do just that ... I started doing a bit of this to look at WPF apps... but the idea fizzled

This is nowhere complete -- but you'll get the idea (its only prototype stuff)

Code:

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
using System.IO; 

namespace Mp3Thing 
{ 
        public partial class Form1 : Form 
        { 
                List<Mp3Tag> tags = new List<Mp3Tag>(); 

                public Form1() 
                { 
                        InitializeComponent(); 
                } 

                private void toolStripButton1_Click(object sender, EventArgs e) 
                { 
                        if (folderBrowserDialog.ShowDialog(this) == DialogResult.OK) 
                        { 
                                
                                foreach (string f in Directory.GetFiles(folderBrowserDialog.SelectedPath)) 
                                { 
                                        byte[] b = File.ReadAllBytes(f); 
                                        int offset = b.Length - 128; 
                                        byte[] tag = new byte[128]; 
                                        Array.Copy(b, offset, tag, 0, 128); 
                                        tags.Add(new Mp3Tag(tag)); 



                                } 
                        } 
                } 
        } 

        class Mp3Tag 
        { 
                int[] _tagLengths = new int[] { 3, 30, 30, 30, 4, 30, 1 }; 

                string _tag; 
            string _songname; 
                string _artist; 
                string _album; 
                string _year; 
                string _comment; 
                string genre; 

                public Mp3Tag(byte[] tag) 
                { 
                        int index = 0; 
                        _tag = Encoding.Default.GetString(tag, index, _tagLengths[0]); 
                        index += _tagLengths[0]; 
                        
                        _songname= Encoding.Default.GetString(tag, index, _tagLengths[1]); 
                        index += _tagLengths[1]; 
                        //_artist; 
                        //_album; 
                        //_year; 
                        //_comment; 
                        //_genre; 


                } 
        } 
}

try here: found this with a google
http://www.codeproject.com/KB/files/tagreader.aspx

 

There's also plenty of open-and-free-to-use libraries that can handle reading/writing/etc of ID3 tags...
i'm actually using one (id3Lib i think) for a project i'm working on in my spare time (which there is WAY too little of... both my GF and my xbox feel a bit neglected right now)