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Vorgehensweise: Starten einer Schleife eines wiedergegebenen Sounds in Windows Forms

  • Artikel

Im folgenden Codebeispiel wird ein Sound mehrfach wiedergegeben. Wenn der Code im stopPlayingButton_Click-Ereignishandler ausgeführt wird, werden alle aktuell wiedergegebenen Sounds beendet. Wenn kein Sound wiedergegeben wird, passiert nichts.

Beispiel

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Media;
using System.Windows.Forms;

namespace SoundPlayerPlayLoopingExample
{
    public class Form1 : Form
    {
        private SoundPlayer Player = new SoundPlayer();

        public Form1()
        {
            InitializeComponent();
        }

        private void playLoopingButton_Click(object sender, EventArgs e)
        {
            try
            {
                // Note: You may need to change the location specified based on
                // the sounds loaded on your computer.
                this.Player.SoundLocation = @"C:\Windows\Media\chimes.wav";
                this.Player.PlayLooping();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error playing sound");
            }
        }

        private void stopPlayingButton_Click(object sender, EventArgs e)
        {
            this.Player.Stop();
        }

        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.playLoopingButton = new System.Windows.Forms.Button();
            this.stopPlayingButton = new System.Windows.Forms.Button();
            this.SuspendLayout();
            //
            // playLoopingButton
            //
            this.playLoopingButton.Location = new System.Drawing.Point(12, 12);
            this.playLoopingButton.Name = "playLoopingButton";
            this.playLoopingButton.Size = new System.Drawing.Size(87, 23);
            this.playLoopingButton.TabIndex = 0;
            this.playLoopingButton.Text = "Play Looping";
            this.playLoopingButton.UseVisualStyleBackColor = true;
            this.playLoopingButton.Click += new System.EventHandler(this.playLoopingButton_Click);
            //
            // stopPlayingButton
            //
            this.stopPlayingButton.Location = new System.Drawing.Point(105, 12);
            this.stopPlayingButton.Name = "stopPlayingButton";
            this.stopPlayingButton.Size = new System.Drawing.Size(75, 23);
            this.stopPlayingButton.TabIndex = 1;
            this.stopPlayingButton.Text = "Stop";
            this.stopPlayingButton.UseVisualStyleBackColor = true;
            this.stopPlayingButton.Click += new System.EventHandler(this.stopPlayingButton_Click);
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(195, 51);
            this.Controls.Add(this.stopPlayingButton);
            this.Controls.Add(this.playLoopingButton);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);
        }

        #endregion

        private System.Windows.Forms.Button playLoopingButton;
        private System.Windows.Forms.Button stopPlayingButton;
    }

    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.Run(new Form1());
        }
    }
}

Imports System.Media
Imports System.Windows.Forms

Public Class Form1
    Inherits System.Windows.Forms.Form

    Private Player As New SoundPlayer

    Sub New()

        Me.InitializeComponent()

    End Sub

    Private Sub playLoopingButton_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) _
        Handles playLoopingButton.Click

        Try
            ' Note: You may need to change the location specified based on
            ' the sounds loaded on your computer.
            Me.Player.SoundLocation = "C:\Windows\Media\chimes.wav"
            Me.Player.PlayLooping()
        Catch ex As Exception
            MessageBox.Show(ex.Message, "Error playing sound")
        End Try

    End Sub

    Private Sub stopPlayingButton_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) _
        Handles stopPlayingButton.Click

        Me.Player.Stop()

    End Sub

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub

    Friend WithEvents playLoopingButton As System.Windows.Forms.Button
    Friend WithEvents stopPlayingButton As System.Windows.Forms.Button

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.playLoopingButton = New System.Windows.Forms.Button
        Me.stopPlayingButton = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'playLoopingButton
        '
        Me.playLoopingButton.Location = New System.Drawing.Point(12, 12)
        Me.playLoopingButton.Name = "playLoopingButton"
        Me.playLoopingButton.Size = New System.Drawing.Size(89, 23)
        Me.playLoopingButton.TabIndex = 0
        Me.playLoopingButton.Text = "Play Looping"
        Me.playLoopingButton.UseVisualStyleBackColor = True
        '
        'stopPlayingButton
        '
        Me.stopPlayingButton.Location = New System.Drawing.Point(107, 12)
        Me.stopPlayingButton.Name = "stopPlayingButton"
        Me.stopPlayingButton.Size = New System.Drawing.Size(75, 23)
        Me.stopPlayingButton.TabIndex = 1
        Me.stopPlayingButton.Text = "Stop"
        Me.stopPlayingButton.UseVisualStyleBackColor = True
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(197, 52)
        Me.Controls.Add(Me.stopPlayingButton)
        Me.Controls.Add(Me.playLoopingButton)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

    <STAThread()> _
    Shared Sub Main()
        Application.EnableVisualStyles()
        Application.Run(New Form1())
    End Sub

End Class

Kompilieren des Codes

Für dieses Beispiel benötigen Sie Folgendes:

  • Verweise auf die Assemblys "System" und "System.Windows.Forms".

  • Ersetzen Sie den Dateinamen "c:\Windows\Media\chimes.wav" durch einen gültigen Dateinamen.

Stabile Programmierung

Dateioperationen sollten in entsprechende Ausnahmebehandlungsblöcke eingeschlossen sein.

Die folgenden Bedingungen können einen Ausnahmefehler verursachen:

.NET Framework-Sicherheit

Beurteilen Sie den Inhalt der Datei nicht anhand des Dateinamens. Bei der Datei "Form1.vb" handelt es sich zum Beispiel nicht unbedingt um eine Visual Basic-Quelldatei. Überprüfen Sie alle Eingaben, bevor Sie die Daten in der Anwendung verwenden.

Siehe auch