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How can I turn NumLocks on and off in VB6?

Posted on 2012-04-04
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Last Modified: 2012-04-04
Is there a way to turn the NumLocks on and off in VB6 (classic vb)?

Thanks!
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Question by:lthames
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Accepted Solution

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vb_elmar earned 500 total points
ID: 37808483
Private Declare Sub keybd_event Lib "user32" (ByVal bVk As Byte, ByVal bScan As Byte, ByVal dwFlags As Long, ByVal dwExtraInfo As Long)
Const VK_NUMLOCK = &H90
Const KEYEVENTF_KEYUP = &H2

Private Sub Command1_Click()
    keybd_event VK_NUMLOCK, 0, 0, 0
    keybd_event VK_NUMLOCK, 0, KEYEVENTF_KEYUP, 0
End Sub
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LVL 17

Expert Comment

by:vb_elmar
ID: 37808564
The following sample checks the numlock state and
if the state is "1" (=numlock enabled) it turns numlock "off".
Please set the "timer1.interval" to 1000

Private Declare Sub keybd_event Lib "user32" (ByVal bVk As Byte, ByVal bScan As Byte, ByVal dwFlags As Long, ByVal dwExtraInfo As Long)
Const VK_NUMLOCK = &H90
Const KEYEVENTF_KEYUP = &H2
Private Declare Function Tasten_Status1 Lib "user32" Alias "GetKeyState" (ByVal nvirtkey As Long) As Integer

Private Sub Timer1_Timer()
ts = Tasten_Status1(144)
Caption = ts '0(numlock disabled) or 1(numlock enabled)

If ts = 1 Then
    keybd_event VK_NUMLOCK, 0, 0, 0
    keybd_event VK_NUMLOCK, 0, KEYEVENTF_KEYUP, 0
End If
End Sub
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Author Comment

by:lthames
ID: 37808572
That doesn't work for me.

I put the first 3 lines in my declarations and added a command button to insert the other code in.

It never changed the status of my caps lock.
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Author Comment

by:lthames
ID: 37808576
trying the sample now.
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Author Comment

by:lthames
ID: 37808588
I am an idiot . . . . I was testing caps lock, not num lock.  It does work.

Thank you very much!!!!!!!!
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Author Closing Comment

by:lthames
ID: 37808592
Thank you!
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