Microsoft KB Archive/110589: Difference between revisions
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Add the following to the general declarations section of Form1, or to a .Bas module file, in Visual Basic: | Add the following to the general declarations section of Form1, or to a .Bas module file, in Visual Basic: | ||
<pre class="codesample"> ' The following Declare statement must be on one, single line: | <pre class="codesample"> ' The following Declare statement must be on one, single line: | ||
Declare Function SendMessage Lib | Declare Function SendMessage Lib "User" (ByVal hWnd As Integer, | ||
ByVal wMsg As Integer, ByVal wParam As Integer, lParam As Any) As | ByVal wMsg As Integer, ByVal wParam As Integer, lParam As Any) As | ||
Long | Long | ||
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<div class="indent"> | <div class="indent"> | ||
"Visual Basic Workshop 3.0" by John C. Craig, published by Microsoft Press. | |||
Revision as of 10:57, 20 July 2020
Article ID: 110589
Article Last Modified on 12/9/2003
APPLIES TO
- Microsoft Visual Basic 2.0 Standard Edition
- Microsoft Visual Basic 3.0 Professional Edition
- Microsoft Visual Basic 2.0 Professional Edition
- Microsoft Visual Basic 3.0 Professional Edition
This article was previously published under Q110589
SUMMARY
The sample code below shows how to start a Visual Basic screen saver by sending a Windows message to the Control-menu box on the form.
MORE INFORMATION
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
You can find two sample programs and a complete explanation showing how to write your own screen savers in Visual Basic in the following book:
"Visual Basic Workshop 3.0" by John C. Craig, published by Microsoft Press.
Additional query words: 3.00 .SCR TOPMOST SETWINDOWPOS SCRNSAVE timer
Keywords: kbcode KB110589
