I am attempting monitor clipboard change by powershell, and never contemplate to make use of evaluating (Get-Clipboard) earlier than and after change as a result of it can’t distinguish between “two copy are equivalent” and “have not make new copy motion but”.

So I attempted to override WndProc of a dummy-control which is added to the chain of clipboard viewers by winAPI SetClipboardViewer.
But it surely appears not similar as anticipated.

#Embody script containing winAPI
.".Set-ClipboardViewer.ps1" 


class MsgOnlyWin : System.Home windows.Kinds.Management{



    [void] NotificationFunction()
    {
    Write-Host "Clipboard modified"
    }

    [void] WndProc($m)
    {
        $WM_DRAWCLIPBOARD = 0x308
        if($m.Msg -eq $WM_DRAWCLIPBOARD){
            NotificationFunction
            break
        }
    }



}


$Con = [MsgOnlyWin]::new()
Set-ClipboardViewer ($Con.Deal with)

The way to repair?