C# Signature:

[DllImport("kernel32.dll", SetLastError=true)]
static extern bool Beep(uint dwFreq, uint dwDuration);

VB Signature:

Declare Function Beep Lib "kernel32.dll" (dwFreq As Integer, _
   dwDuration As Integer) As Boolean

Parameter Information:

dwFreq

Windows NT:

Specifies the frequency, in hertz, of the sound. This parameter must be in the range 37 through 32,767 (0x25 through 0x7FFF).

Windows 95:

The parameter is ignored.

dwDuration

Windows NT:

Specifies the duration, in milliseconds, of the sound.

Windows 95:

The parameter is ignored.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Notes:

Unlike MessageBeep, this function is synchronous. (It doesn't return control to its caller until the sound finishes.)

Tips & Tricks:

Please add some sample code!

VB.NET Sample Code:

The following sample plays the PC speaker in a series of ascending frequencies:

Declare Function Beep Lib "kernel32.dll" (ByVal dwFreq As Integer, _
ByVal dwDuration As Integer) As Boolean

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
     Dim I As Integer
     For I = 900 To 1400    
     Beep(I, 5)
     Next
End Sub

C# Sample Code:

The following sample plays the PC speaker in a series of ascending frequencies:

using System;
using System.Runtime.InteropServices;

class BeepSample
{
    [DllImport("kernel32.dll", SetLastError=true)]
    static extern bool Beep(uint dwFreq, uint dwDuration);

    static void Main()
    {
        Console.WriteLine("Testing PC speaker...");
        for (uint i = 100; i <= 20000; i++)
        {
            Beep(i, 5);
        }
        Console.WriteLine("Testing complete.");
    }
}

Added by David C. Carachi

Alternative Managed API:

System.Console.Beep, coming in v2.0 (Whidbey) of the .NET Framework

Please edit this page!

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