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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
Apr 20, 1999



Application Security Testing: An Integral Part of DevOps

The status of shift keys

Visual Basic lets you test the state of the Shift, Alt and Ctrl keys only within the KeyUp, KeyDown and all the mouse-related event procedures. If you want to test the state of these keys from within another routine, you can resort to the following functions:

Private Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As _

' The state of the Ctrl key
Function CtrlKey() As Boolean
    CtrlKey = (GetAsyncKeyState(vbKeyControl) And &H8000)
End Function

' The state of either Shift keys
Function ShiftKey() As Boolean
    ShiftKey = (GetAsyncKeyState(vbKeyShift) And &H8000)
End Function

' The state of the Alt key
Function AltKey() As Boolean
    AltKey = (GetAsyncKeyState(vbKeyMenu) And &H8000)
End Function
Francesco Balena
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