mp3 player mit winmm, ereignis mp3 ende

Question

Ich finde etwas Code und modifiziere es für meinen eigenen Zweck. Aber ich weiß nicht, wie man hakt, wenn mp3 das Ende erreicht. Ich möchte tun, wenn ein Lied endet, das nächste spielt. Zufallslied spielen, wenn das aktuelle Ende einfach ist, aber wie kann man wissen, wann es zu Ende ist? Sollte ich versuchen, Länge des Liedes zu berechnen und Timer zu verwenden, um Funktion zu rufen, wenn der Song endet?

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.Runtime.InteropServices; 
using System.IO; 

namespace Playing_MP3_songs 
{ 
    public partial class Form1 : Form 
    { 
     public const int MM_MCINOTIFY = 0x3B9; 
     [DllImport("winmm.dll")] 
     private static extern long mciSendString(string strCommand, StringBuilder strReturn, int iReturnLength, IntPtr hwndCallback); 

     List<string> lista; 
     List<string> lista2; 
     string st; 
     public Form1() 
     { 
      InitializeComponent(); 


     } 

     private void set_list() 
     { 
      string[] costam = Directory.GetFiles(folderBrowserDialog1.SelectedPath, "*.mp3", SearchOption.AllDirectories); 
      string[] costam2 = new string[Directory.GetFiles(folderBrowserDialog1.SelectedPath, "*.mp3", SearchOption.AllDirectories).Count()]; 
      int ilosc = costam.Count(); 
      int x = 0; 
      while (x <= ilosc - 1) 
      { 
       costam2[x] = Path.GetFileName(costam[x]); 
       x++; 

      } 
      lista = new List<string>(costam); 
      lista2 = new List<string>(costam2); 
      //listBox1.Sorted = true; 
      listBox2.DataSource = lista; 
      listBox1.DataSource = lista2; 
      if (listBox1.Items.Count == 0) 
      { 
       button2.Enabled = false; 
       button3.Enabled = false; 
      } 
      else 
      { 
       button2.Enabled = false; 
       button3.Enabled = true; 
      } 
     } 

     private void button1_Click(object sender, EventArgs e) 
     { 
      if (folderBrowserDialog1.ShowDialog() == DialogResult.OK) 
      { 
       set_list(); 
       button3.Enabled = true; //So you dont play no file. lol 
      } 


     } 


     protected override void OnLoad(EventArgs e) 
     { 

      base.OnLoad(e); 
      TextReader sr = new StreamReader("path.txt"); 
      st = sr.ReadLine(); 
      sr.Close(); 
      folderBrowserDialog1.SelectedPath = st; 
      set_list(); 
     } 
     protected override void OnClosing(CancelEventArgs e) 
     { 
      base.OnClosing(e); 
      TextWriter writer = new StreamWriter("path.txt"); 
      writer.WriteLine(folderBrowserDialog1.SelectedPath); 
      writer.Close(); 
     } 

     private void button3_Click(object sender, EventArgs e) 
     { 
      stop(); 
      listBox2.SetSelected(listBox1.SelectedIndex, true); 
      mciSendString("open \"" + listBox2.SelectedItem.ToString() + "\" type mpegvideo alias MediaFile", null, 0, IntPtr.Zero); 
      mciSendString("play MediaFile", null, 0, IntPtr.Zero); 

      //button3.Enabled = false; 
      button2.Enabled = true; 
     } 

     private void play() 
     { 
      stop(); 
      listBox2.SetSelected(listBox1.SelectedIndex, true); 
      mciSendString("open \"" + listBox2.SelectedItem.ToString() + "\" type mpegvideo alias MediaFile", null, 0, IntPtr.Zero); 
      mciSendString("play MediaFile", null, 0, IntPtr.Zero); 
      //button3.Enabled = false; 
      button2.Enabled = true; 
     } 

     private void stop() 
     { 
      mciSendString("close MediaFile", null, 0, IntPtr.Zero); 
      listBox2.ClearSelected(); 
      //button2.Enabled = false; 
      button3.Enabled = true; 
     } 

     private void button2_Click(object sender, EventArgs e) 
     { 
      mciSendString("close MediaFile", null, 0, IntPtr.Zero); 
      listBox2.ClearSelected(); 
      button2.Enabled = false; 
      button3.Enabled = true; 
     } 

     private void listBox1_KeyPress(object sender, KeyPressEventArgs e) 
     { 
      if (e.KeyChar.ToString() == "B") 
      { 
       listBox1.ClearSelected(); 
       int ilosc = listBox1.Items.Count; 
       Random random = new Random(); 
       int number = random.Next(0, ilosc - 1); 
       listBox1.SetSelected(number, true); 
       stop(); 
       play(); 
       e.Handled = true; 
      } 

     } 

     private void listBox1_DoubleClick(object sender, EventArgs e) 
     { 
      play(); 
     } 

    } 
} 

Answer 1

Append notify zu play MediaFile Befehl:

mciSendString("play MediaFile notify", null, 0, IntPtr.Zero); 

WndProc überschreiben die Funktion in der Form, wobei die Nachricht mitteilen zu empfangen, wenn die Wiedergabe abgeschlossen

protected override void WndProc(ref Message m) 
{ 
    if (m.Msg == Media.MM_MCINOTIFY) 
    { 
     do smthing.. 
    } 
    base.WndProc(ref m); 
}