How to: Use Platform Invoke to Play a Wave File (C# Programming Guide)
The following C# code example illustrates how to use platform invoke services to play a wave sound file on the Windows platform.
Example
This example code uses DllImport to import winmm.dll's PlaySound method entry point as Form1 PlaySound(). The example has a simple Windows Form with a button. Clicking the button opens a standard windows OpenFileDialog dialog box so you can open a file to play. When a wave file is selected, it is played using the PlaySound() method of the winmm.DLL assembly method. For more information on winmm.dll's PlaySound method, see Using PlaySound to Play Waveform-Audio Files. Browse and select a file with a .wav extension, and then click Open to play the wave file using platform invoke. A text box shows the full path of the file selected.
The Open Files dialog box is filtered to show only files with a .wav extension through the filter settings:
dialog1.Filter = "Wav Files (*.wav)|*.wav";
using System.Windows.Forms; namespace WinSound { public partial class Form1 : Form { private TextBox textBox1; private Button button1; public Form1() //constructor { InitializeComponent(); } [System.Runtime.InteropServices.DllImport("winmm.DLL", EntryPoint = "PlaySound", SetLastError = true)] private static extern bool PlaySound(string szSound, System.IntPtr hMod, PlaySoundFlags flags); [System.Flags] public enum PlaySoundFlags : int { SND_SYNC = 0x0000, SND_ASYNC = 0x0001, SND_NODEFAULT = 0x0002, SND_LOOP = 0x0008, SND_NOSTOP = 0x0010, SND_NOWAIT = 0x00002000, SND_FILENAME = 0x00020000, SND_RESOURCE = 0x00040004 } private void button1_Click (object sender, System.EventArgs e) { OpenFileDialog dialog1 = new OpenFileDialog(); dialog1.Title = "Browse to find sound file to play"; dialog1.InitialDirectory = @"c:\"; dialog1.Filter = "Wav Files (*.wav)|*.wav"; dialog1.FilterIndex = 2; dialog1.RestoreDirectory = true; if(dialog1.ShowDialog() == DialogResult.OK) { textBox1.Text = dialog1.FileName; PlaySound (dialog1.FileName, new System.IntPtr(), PlaySoundFlags.SND_SYNC); } } } }
Compiling the Code
To compile the code
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Create a new C# Windows Application project in Visual Studio and name it WinSound.
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Copy the code above, and paste it over the contents of the
Form1.csfile. -
Copy the following code, and paste it in the
Form1.Designer.csfile, in theInitializeComponent()method, after any existing code.this.button1 = new System.Windows.Forms.Button(); this.textBox1 = new System.Windows.Forms.TextBox(); this.SuspendLayout(); // // button1 // this.button1.Location = new System.Drawing.Point(192, 40); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(88, 24); this.button1.TabIndex = 0; this.button1.Text = "Browse"; this.button1.Click += new System.EventHandler(this.button1_Click); // // textBox1 // this.textBox1.Location = new System.Drawing.Point(8, 40); this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(168, 20); this.textBox1.TabIndex = 1; this.textBox1.Text = "FIle path"; // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(5, 13); this.ClientSize = new System.Drawing.Size(292, 266); this.Controls.Add(this.textBox1); this.Controls.Add(this.button1); this.Name = "Form1"; this.Text = "Platform Invoke WinSound C#"; this.ResumeLayout(false); this.PerformLayout();
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Compile and run the code.
Security
For more information, see .NET Framework Security.
