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how to trigger function by keypressed

I gonna pop up the message box everytime i pressed "F12" in my keyboard. ( or i pressed Ctrl + Y")

Private Function testing ()
    Msgbox ("Hello")
End Function

How to do it?
0
kengkit
Asked:
kengkit
1 Solution
 
Mike TomlinsonMiddle School Assistant TeacherCommented:
Do you want this only when YOUR app is in focus?  Or when ANY app is in focus?
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kengkitAuthor Commented:
in fact.. i juz wants tis when my app is in focus

but it's good if u can tell me both.
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ZeonFlashCommented:
I'm not sure how to do it if your app doesn't have focus (I haven't brushed up on my keyboard hooking), but here's how you can do it if your app has focus:

    Private Function testing()
        Msgbox("Hello")
    End Function

    Protected Overrides Function ProcessCmdKey(ByRef msg As System.Windows.Forms.Message, ByVal keyData As System.Windows.Forms.Keys) As Boolean
        If keyData = Keys.Control + Keys.Y Or keyData = Keys.F12 Then
            testing()
            Return True
        End If
    End Function
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manchCommented:
'U Can use the IMessageFilter Interface for it
' Creates a message filter.
Public Class TestMessageFilter
   Implements IMessageFilter

   Public Function PreFilterMessage(ByRef m As System.Windows.Forms.Message) _
   As Boolean Implements IMessageFilter.PreFilterMessage
      ' Blocks all the messages relating to the left mouse button.
      If ((m.Msg >= 513) And (m.Msg <= 515)) Then
         Console.WriteLine("Processing the messages : " & m.Msg)
         Return True
      End If
      Return False
   End Function
End Class

Try It
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Mike TomlinsonMiddle School Assistant TeacherCommented:
Here is an example of the hook approach that allows you trap keypresses while your app is not in focus:
http://www.experts-exchange.com/Programming/Programming_Languages/Dot_Net/VB_DOT_NET/Q_21584180.html
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