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VB listen for arrow keys

Posted on 2005-03-07
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Last Modified: 2008-02-01
I have a mature fielded application that i am trying to retrofit. I need to listen for the Left and Right arrow keys fro the keyboard.

The software is a presentation tool and there are several forms or containers playing differnt media formats. When I set keypreview to the master form and try to use the built in keydown or keypress subs they do not always have focu and in most cases never get the message anyway. There is also an optional topmost floating toolbar to interfere with focus.

I have a timer running at 200ms to listen for the mouse curssor hitting an edge where i produce a pop up menu.

Ideally there would be some way to read the keyboard buffer in the timer sub, decide if i need to take a Previous or Next  action and flush the keyboard buffer.
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Question by:nphoenix
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Erick37 earned 1000 total points
ID: 13482495
You can poll the keyboard state in your time with the GetAsyncKeyState API.
More info here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/userinput/keyboardinput/keyboardinputreference/keyboardinputfunctions/getasynckeystate.asp

Private Const VK_RIGHT = &H27
Private Const VK_LEFT = &H25
Private Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As Integer


'===============================    
   
If GetAsyncKeyState(VK_RIGHT) Then
    Debug.Print "Right Arrow"
End If

If GetAsyncKeyState(VK_LEFT) Then
    Debug.Print "Left Arrow"
End If
   
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by:nphoenix
ID: 13486662
Awesome - that was it exactly. :) Thanks!
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