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Guide pratique pour mettre en boucle l’émission d’un son dans un Windows Form

  • Article

L'exemple de code suivant joue un son de manière répétitive. Quand le code du gestionnaire d'événements stopPlayingButton_Click est exécuté, le son s'arrête. Si aucun son n'est joué, rien ne se produit.

Exemple

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

Compilation du code

Cet exemple nécessite :

  • des références aux assemblys System et System.Windows.Forms ;

  • que vous remplaciez le nom de fichier "c:\Windows\Media\chimes.wav" par un nom de fichier valide.

Programmation fiable

Les opérations de fichiers doivent être placées dans des blocs de gestion des exceptions appropriés.

Les conditions ci-dessous peuvent générer une exception.

Sécurité du .NET Framework

Ne vous basez pas sur le nom d'un fichier pour en déterminer le contenu. Par exemple, le fichier Form1.vb peut ne pas être un fichier source Visual Basic. Vérifiez toutes les entrées avant d'utiliser les données dans votre application.

Voir aussi