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Visual Basic(Microsoft): Version 3 & 4 FAQ
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API
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How can I turn on the windows screen saver?
Posted: 13 Feb 03
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Microsoft Windows starts screen savers through the System-menu box on a form. The System-menu box is also known as the Control-menu box in Visual Basic. You can send Windows messages to the Control-menu box by using the SendMessage Windows API (application programming interface) function.
Add the following to the general declarations section of Form1, or to
a .Bas module file, in Visual Basic:
' The following Declare statement must be on one, single line:
Declare Function SendMessage Lib "User" (ByVal hWnd As Integer,
ByVal wMsg As Integer, ByVal wParam As Integer, lParam As Any) As Long
In the following example, a command button starts the Form1 screen saver:
Sub Command1_Click ()
Dim result As Long
Const WM_SYSCOMMAND = &H112
Const SC_SCREENSAVE = &HF140
result = SendMessage(Form1.hWnd, WM_SYSCOMMAND, SC_SCREENSAVE, 0&)
End Sub
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