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detect screensaver in vb.net

Posted on 2009-04-06
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Last Modified: 2012-05-06
Hi

I'm using VB.NET 2008 & WinForms. I need a function that returns True if the system screensaver is running.

I have tried this:

Private Declare Function SystemParametersInfo Lib "user32" Alias "SystemParametersInfoA" (ByVal uAction As Integer, ByVal uParam As Integer, ByVal lpvParam As Integer, ByVal fuWinIni As Integer) As Integer

    Public Shared Function IsScreenSaverRunning() As Boolean
        Dim Running As Integer
        Const SPI_GETSCREENSAVEACTIVE As Integer = 16
        SystemParametersInfo(SPI_GETSCREENSAVEACTIVE, 0, Running, 0)
        Return Running
    End Function

But SystemParametersInfo returns an error value and after callin GetLastError I ger error 998 (Invalid access to memory location).

I guess the problem is with the API calling / passing parameters.

Any ideas?

Thanks
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Question by:rettiseert
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2 Comments
 
LVL 86

Accepted Solution

by:
Mike Tomlinson earned 250 total points
ID: 24083507
This worked for me...

Note that I'm using SPI_GETSCREENSAVERRUNNING and the third parameter is being passed ByRef instead of ByVal:
Public Class Form1
 
    Private Const SPI_GETSCREENSAVERRUNNING As Integer = &H72
    Private Declare Function SystemParametersInfo Lib "user32" Alias "SystemParametersInfoA" _
        (ByVal uiAction As Integer, ByVal uiParam As Integer, ByRef pvParam As Integer, ByVal fWInIni As Integer) As Boolean
 
    Public Shared Function IsScreenSaverRunning() As Boolean
        Dim bRunning As Boolean
        SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0, bRunning, False)
        Return bRunning
    End Function
 
    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        If Form1.IsScreenSaverRunning Then
            My.Computer.Audio.PlaySystemSound(Media.SystemSounds.Asterisk)
        End If
    End Sub
 
End Class

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by:rettiseert
ID: 31567311
Wonderful, thank you.
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