serialization question

I am making a media player using a windows form application project in mircosoft visual studio. So far I am able to display songs in a listbox,play, pause etc and now I want to be able to make playlists for the songs. I have two forms - one with buttons to play, pause stop all the songs, and display the songs and the second is for making the playlists. In the playlist form there is two listboxs - one with a list of the songs in the playlist and the second for the songs you add to the playlist. theres is also an add button and remove button and a textbox to put the name of the playlist in. And finally a create button. So I need a bit of help creating the playlist. heres the code I have so far for the create button:

Code:

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private void button1_Click(object sender, EventArgs e) //create playlist
        {
            Playlist temp = new Playlist(textBoxPlaylist.Text);
            foreach(string name in PlaylistTracks.Items)
            {
                temp.addSong(name);
         
            }

        }

---

so far nothing happens when I click the button. I need the playlist to save the songs in the listbox and the name in the textbox. I also have a listbox in the first form that I want to populate with the names of the playlists that have been created. Not sure what code to use to do that.
Hope I explained all this enough

i have attached a screen shot of the playlist form. Hope it helps explain my problem

Quote:

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Originally Posted by beginner91

i have attached a screen shot of the playlist form. Hope it helps explain my problem

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It is better to submit image files as jpegs or gifs, as not everyone can read docX files. For the benefit of those of us who either don't have an up-to-date Word, or don't know that docX files are effectively zip files :), here is the relevant image:

Quote:

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or don't know that docX files are effectively zip file

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...?

Quote:

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Originally Posted by BioPhysEngr

...?

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It's true - change the extension to .zip and you can open it using unzip or some such application. That's how I extracted the image.

Good to know. Thanks!

now that the image is sorted can someone help with my problem?

As far as I know there's no VS standard library containing Playlist. Mind givings us what you do in your add() method ?

ok here is all the code for you get a better idea of what i'm trying to do

Code:

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namespace Playing_MP3_songs
{
    public partial class CreatePlaylistForm : Form
    {
        [DllImport("winmm.dll")]
        private static extern long mciSendString(string strCommand, StringBuilder strReturn, int iReturnLength, IntPtr hwndCallback);
        bool paused = false;
        ArrayList myPlaylistsCollection = new ArrayList();

        public CreatePlaylistForm()
        {
            InitializeComponent();
            // DirectoryInfo dinfo = new DirectoryInfo(@"C:\Users\Public\Music\Sample Music");
            DirectoryInfo dinfo = new DirectoryInfo(@"C:\music");
            FileInfo[] Files = dinfo.GetFiles("*.mp3");
            foreach (FileInfo file in Files)
            {
                LibraryTracks.Items.Add(file.Name);
            }
        }

        private void button2_Click(object sender, EventArgs e) //add track
        {
            foreach(string name in PlaylistTracks.Items )
            {
                if (LibraryTracks.SelectedItem.ToString() == name)
                {
                    MessageBox.Show("Song already in playlist");
                    return;
                }
           
            }
          PlaylistTracks.Items.Add(LibraryTracks.SelectedItem);
        }

        private void button3_Click(object sender, EventArgs e) //remove track
        {
         
          PlaylistTracks.Items.Remove(PlaylistTracks.SelectedItem);
     
        }

        private void button1_Click(object sender, EventArgs e) //create playlist
        {
            Playlist temp = new Playlist(textBoxPlaylist.Text);
            foreach(string name in PlaylistTracks.Items)
            {
                temp.addSong(name);
         
            }

        }

    }
}

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and looking at the image of what form the first listbox is populated from a folder called music. The second listbox is for the playlist. The add/remove buttons add or remove the songs to the second listbox. I want the create button to save the selection of songs in the second listbox and the name in the textbox.
I then have another form where I want the names of the playlists to be displayed in

Look at this code:

Code:

---

        private void button1_Click(object sender, EventArgs e) //create playlist
        {
            Playlist temp = new Playlist(textBoxPlaylist.Text);
            foreach(string name in PlaylistTracks.Items)
            {
                temp.addSong(name);
         
            }

        }

---

You are creating a new Playlist and populating it correctly, but it is lost when the click handler finishes. You need to save it in a variable (i.e. a collection of playlists) outside this function.

ok thanks but how would I do that?

Quote:

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Originally Posted by beginner91

ok thanks but how would I do that?

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Instead of having the Playlist temp a local variable inside the button click handler, make it a class field or property (so it has class scope).

Do you know how to declare a class field? E.g.

Code:

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private PlayList _playList;

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i ready made a class for playlist

Code:

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namespace Playing_MP3_songs
{
    class Playlist
    {
        private string name;
        ArrayList list;

        public Playlist(string name)
        {
            this.name = name;
            list = new ArrayList();
        }
        public void addSong(string fileName)
        {
            list.Add(fileName);
       
        }
      }


   
}

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Playlist is referring to this class

You have this data member in your class:

Code:

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ArrayList myPlaylistsCollection = new ArrayList();

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Shouldn't the playlists go in there :confused:

yes you are right. so how do i put the playlists in there?