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Visual Basic > Windows and Controls Code Examples

Turn the Screen Saver on or off

Turn the Screen Saver on or off

To switch the screen saver on and off use the following code:

Private Const SC_SCREENSAVE = &HF140&
Private Const WM_SYSCOMMAND = &H112
Private Declare Function FindWindowA Lib "user32" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long

'Purpose     :  Changes the state of the screen saver
'Inputs      :  bScreenSaver        If True, starts the Screen Saver
'                                   else turns the Screen Saver off
'               [lHwnd]             VB: The form handle OR
'               [sFormCaption]      VBA: The caption of the form calling the
'                                   routine, can be Me.Caption or Application.Caption


Sub ScreenSaver(bScreenSaver As Boolean, Optional lHwnd As Long, Optional sFormCaption As String)
    Dim lState As Long
    If lHwnd = 0 Then
        lHwnd = FindWindowA(vbNullString, sFormCaption)
    End If
    If bScreenSaver Then
        lState = 1
    Else
        lState = -1
    End If
    Call SendMessage(lHwnd, WM_SYSCOMMAND, SC_SCREENSAVE, lState)
End Sub

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