Detecting Mouse-Clicks Globally

Friday Jan 30th 2004 by Aaron Young
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Learn how to detect a mouse click anywhere in Windows. (Added: 1-Feb-2000)

This code sample shows how to detect a mouse click anywhere on the desktop and on any window.

screen-shot

The code works by utilising the GetAsyncKeyState API call that can check the status of keyboard and mouse input at any point in a programs processing.

A form is used with a timer that fires every 10th of a second to check for the VK_LBUTTON and VK_RBUTTON keystates (the left and right mouse buttons).


option Explicit

private Declare Function GetAsyncKeyState Lib "user32" _
        (byval vKey as Long) as Integer
private Const VK_LBUTTON = &H1
private Const VK_RBUTTON = &H2

private Sub Form_Load()
    Timer1.Interval = 100
End Sub

private Sub Timer1_Timer()
    If GetAsyncKeyState(VK_LBUTTON) then
        Label2.Caption = "Left Click"
    ElseIf GetAsyncKeyState(VK_RBUTTON) then
        Label2.Caption = "Right Click"
    else
        Label2.Caption = ""
    End If
End Sub
'

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