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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

Positional Notation of numbers in C Code
Enter the number to convert, enter base to which we will convert n, right-hand digit of nprime. Generate digits of converted number right to left. Isolate right-hand digit of n.

Calculates the Mean Variance & Deviation
This C Program calculates the mean, variance and standard deviation. The formula which is used in this c program are mean = average of the numbers. var=(summation( ( Xj - average

Prints Day Name of Week Array Constant
Input week day number from user. Store it in a variable say week. Print Monday if week=1. I have assumed Monday as first day of week. And check condition for all 7 days & print the

C++ Language Implements Binomial Heap
Linking nodes in binomial heap. Create nodes in binomial heap and Insert nodes in binomial heap. Union nodes in "Binomial Heap". Merge nodes in binomial heap. And display binomial

Find Maximum between 2 Numbers using
C Program input two numbers from user and find maximum between two numbers using switch case. Input two numbers. Store it in a variable say j1 & j2. Switch expression j1 > j2

C++ Programming Code Swap two Strings
To swap two string in C++, enter the 2 strings, and store both the 'string' in variables say str1 & str2. To swap 2 strings, first make a variable say temp of the same type. 'Place the string1'

Count Number of Words in the given Text
Program takes a string as input and count the number of words in the input string. Take the string as input, store it in the array 's[]'. Using for loop search for a space ' ' in the string and

C Sender program using Message Queues
This is the C sender program using Message Queues. A message queue program code that shows a client server implementation. Enter some message text you want to send.

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