Binaryworld - The status of mouse buttons ... [ VB -> Keyboard-Mouse ]

Visual Basic lets you test the state of mouse buttons only inside a MouseDown, MouseMove, or MouseUp event procedure. To determine the current state of mouse buttons you can use one of the following functions:

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

Function LeftButton() As Boolean
  LeftButton = (GetAsyncKeyState(vbKeyLButton) And &H8000)
End Function

Function RightButton() As Boolean
  RightButton = (GetAsyncKeyState(vbKeyRButton) And &H8000)
End Function

Function MiddleButton() As Boolean
  MiddleButton = (GetAsyncKeyState(vbKeyMButton) And &H8000)
End Function

If you prefer, you can use the following function, which returns the state of all three buttons as a bit-coded field, in the same format as the Button argument passed to mouse event procedures:

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Function MouseButton() As Integer
  If GetAsyncKeyState(vbKeyLButton) < 0 Then
    MouseButton = 1
  End If
  If GetAsyncKeyState(vbKeyRButton) < 0 Then
    MouseButton = MouseButton Or 2
  End If
  If GetAsyncKeyState(vbKeyMButton) < 0 Then
    MouseButton = MouseButton Or 4
  End If
End Function